Filson
Wastewater Treatment Screens Manufacturer

Your Indispensable Wastewater Treatment Screen Manufacturer In China

Filson wastewater treatment screen is a durable and proven filter system to remove a variety of useless solids and particles from wastewater. It performs well filtration effect to avoid pumps valves and another equipment plugging while reducing the costly downtime.

For 20years, Filson wastewater treatment screens are utilized and trusted by customers in over forty countries worldwide. Our seasoned team from engineers to sales is always here at your service!

Wastewater Treatment Screens

1.Perforated Plate Screen Wastewater
Filson perforated plate screen for wastewater is a efficient filtration and separation media produced by perforated plate. It is available in a variety of opening sizes from 1mm to 6mm, and the most common size is 6mm. In some instances, Filson perforated plate screen can remove more solids than wedge wire types.
2.Band Screen Wastewater
Filson band screen, also named travelling band screen, is an ideal choice for fine filtration in wastewater treatment systems. It has maximum separation efficiency up to 84% of fibre and hair from wastewater, especially with narrow channels and high throughput.
3.Wastewater Bar Screens
Filson wastewater bar screens are generally used to remove lager or medium particles from wastewater, such as rags, sticks, cans, plastic packets. Standard bar spacing for wastewater bar screens is from 5 to 100 mm, or can be customized depending on required flow rate, wastewater composition and channel dimensions.
4.Sewage Screen
Filson sewage screen is used for the primary level of filtration, and fitted inside the wastewater treatment plants. Filson sewage screen can protect pumps from rags, wipes, plastics and other solid contaminants, while extending system service life and improving the quality of wastewater treatment.
5.Sewer Screens
Filson sewer screen can be produced with bar screens or perforated plate screens for you specific application. It is mainly used for sewer systems to retain large debris, providing sustainable environmental protection.
6.Mechanical Screen Wastewater
Filson mechanical screen is usually applied at the first step in the wastewater pretreatment process. We offer a wide range of mechanical screen kinds with highest quality, from coarse bar screen, drum screen to screw screen.
7.inlet screen
Filson wastewater inlet screen is typically designed for middle and small scale wastewater treatment plants with flexible site configuration. By the unique pivoting system, Filson wastewater inlet screen allows a simple maintenance and cleaning operation.
8.Coarse Screens
Filson coarse screens consist of parallel bars, rods or metal wires with the slot opening range from 0.25 to 6 in. It can easily remove coarse solids like rags and other large particles, to provide preeminent liquidity without losing capture rate.
9.Micro Screening In Wastewater Treatment
Filson micro screening in wastewater treatment consists of a fine fabric or mesh winding around a metal drum, with the micron rating of 10-35µm. It makes the filtration process very simple and efficient due to its overall structure design.
10.Wastewater Fine Screens
Filson wastewater fine screens are commonly used to remove fine particles in the primary effluent, since its small openings are even down to 0.06”. Fine screens in wastewater treatment is roughly divided into three types, including static wedge wire screen, rotary drum screen and step type screen.
11.Coanda Screen
Filson coanda screen has superior self-cleaning ability and high abstraction flow capacity beacuse of its special wedge wire structure. It utilizes the coanda effect to make the water flow attaching the screen surface and contributing to uniform debris filtration.
12.Sieve Bend Screen
Filson sieve bend screen can help you efficiently separate fine solids from slurry in many applications, such as quarries, minerals, agriculture, food processing and wastewater. We fabricate a wide size range of sieve bend screens to ensure properly fit your machine.
13.Rotary Drum Screen Wastewater
Filson rotary drum screen is a optimal solution for the fine treatment of industrial and domestic wastewater. With a fully enclosed screen design, rotating drums in wastewater treatment may prevent the spread of unpleasant odors and dangerous gases.
14.Replacement Wastewater Screens
Filson supplies replacement wastewater screens of various brands, such as parkson wastewater screens(parkson screens). Meanwhile, we have a number of stock and sophisticated production equipment to ensure a fast delivery.

Why Select Filson Wastewater Treatment Screen?

  • Premium quality

Filson manufactures wastewater treatment screen mainly in stainless steel 304/316L with material certification , giving you a reliable and premium product.

  • Comprehensive service

Filson always offers the full service from design to manufacture, and OEM service is available according to your drawings, application and specifications.

  • Fast production & delivery

Filson has a complete production line with skilled workers and sufficient inventory, thus we can guarantee a short delivery time usually within 2-3 weeks.

  • Refurbishment & Replacement

Filson can help you solve the replacement problems by designing a new wastewater screen or finding a suitable substitute through your existing facility.

  • Innovative technology

Filson specialist engineers have rich design and site experience, to assist in your bespoke design and installation guidance.

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Filson: One Stop Solution For All Your Wastewater Treatment Screen Needs

Filson wastewater treatment screen, also called wastewater screen, is an essential screening part used in wastewater treatment. It provides outstanding solids retention performance and efficiently protect downstream equipment.

wastewater screen rotary drum screen

Filson wastewater treatment screens are mainly made of stainless steel 304 or 316L materials. It always exhibits superior corrosion resistance and high mechanical strength when working in harsh environment.

Filson supplies various types of screens in wastewater treatment. Typically, there are four regular shapes: bar screen, wedge wire screen, perforated plate screen, and mesh screen. Each type of Filson wastewater screen is available in wide range of dimensions and accuracy to fit your different requirements.

wastewater screen rotary drum wastewater treatment screen

The most widely used type is bar screen, especially the coarse screen and trash racks have the maximum slot size of 6 inch. If you require higher capture efficiency, you can choose other three types due to their narrow openings less than 0.001 inch.

Standard screen width of Filson wastewater treatment screen comes is from 1.0’ to 9.0’ with flow rate up to 100 MGD per unit. You can install Filson wastewater screen at either upstream or downstream, but we recommend you to install the fine screen at upstream to reduce clogging.

wastewater screen wastewater treatment screen

In addition, Filson wastewater treatment screen can be installed in an enclosed area after engineer’s evaluation, from equipment design, climate to odor control needs. And a mechanically cleaned bar screen always should be enclosed.

Filson wastewater screens are permitted to clean by a mechanical method or a manual way. A mechanically cleaned screen is always equipped with a rotating brush, so it is more suitable for handling huge quantity of debris like storm water debris.

wastewater treatment screen fine screen micro screening

However, a manually cleaned screen is still a preferred and economic option for smaller wastewater treatment plants. It is generally designed with a relatively shallow screening channels to allow convenient manual cleaning with a rake or high pressure water jetting.

Over the last 20 years, Filson has developed a wide range of advanced and innovative wastewater treatment screen technologies. Thus we can exactly help you complete high-strength or difficult-to-treat wastewater treatment projects in a variety of industries.

wastewater treatment screen rotary drum screen

Want more insider information for Filson wastewater treatment screen? Contact us at +86 157 3695 8886 or send to [email protected]. We will connect you within 12 hours!

You may also be interested in other filters or screens like stainless steel filter cartridges, sintered filters, wire mesh filters, basket filters, wedge wire filters, coalescing filter elements

To cooperate with Filson, is to work with reliable quality, stable delivery and the best price!

wastewater treatment screen from Filson

Filson Wastewater Treatment Screen Features:

  • Rigid structure by resistance welding process
  • Superior particles capture rate due to the wide slot size range
  • Easy to clean and replace without interrupted operation
  • Support to self-clean with long using life
  • Low maintenance because of no moving parts
  • Minimal odors emission by enclosed design

wastewater treatment screen

Filson Wastewater Treatment Screen Specifications:

  • Raw material: SS 304, SS 316L, Super Duplex, Monel 400, Hastelloy, Alloy 20
  • Wedge wire slot size: 0.001-0.625 in.
  • Perforated plate opening size: down to 1mm
  • Bar slot size: 0.06-6 in.
  • Screen width: 1.0’ – 9.0’

bar screen wastewater treatment screen

Filson Wastewater Treatment Screen Applications:

  • Wastewater treatment
  • Refineries
  • Food and beverage
  • Pulp and paper mills
  • Construction sites
  • Process water reuse
  • Mining industry
  • Municipal and domestic

People Also Ask

What Is Wastewater Treatment Screen?

During wastewater treatment, the wastewater first undergoes screening.

Screening removes any objects that may pose as potential damage to the downstream equipment in the water treatment.

Such objects include plastics, papers, rags, and metals.

Failure to remove these materials at the earlier stages of the wastewater treatment can cause clogging, or worse-off, damage the equipment.

To carry out screening, most water treatment plants use wastewater treatment screens. These screens are specially designed to remove material/solids efficiently.

Commonly, the screens used in wastewater treatment are categorized into;

  • Coarse Screens – These remove rags, large solids, and debris. Typically, they have openings measuring not less than 0.25 inches.

Coarse Waste Water Screen

Coarse Waste Water Screen

  • Fine Screens – Unlike coarse screens, these types of screens have openings ranging from 0.06 to 0.25 inches.

Fine Waste Water Screen

 Fine Waste Water Screen

  • Micro Screens – However, there are finer screens (with openings less than 0.06 inches) placed after the less fine or coarse screens.

Micro Screen

Micro Screen

In summary, a wastewater treatment screen is a device fitted in a wastewater treatment plant to retain materials (screenings) that may potentially lead to clogging or damage.

Which Features Should You Look For In Wastewater Treatment Screen?

There are various types of wastewater treatment screens. Consequently, when you are looking to purchase a screen, there are key features you should consider to ensure you get the best screen.Such features include:

  • Size of the screen openings – First, you need to know the particle sizes you intend to trap using the screen. With this knowledge, you should look at the micron ratings of the various wastewater treatment screens and select the ideal for your plant.
  • Self-Cleaning Feature – The screens are prone to clogging due to material accumulation on the screen’s surface over time. Thus, selecting a wastewater screen that features self-cleaning will make the wastewater treatment process efficient and reduce the maintenance cost.

A Self Screening Wastewater Screen

A Self Screening Screen

  • Screening Type – Most screens offer either coarse or fine screening. However, newer screens provide both coarse and fine screening. Installing a screen that offers fine and coarse screens is a plus since the screening will be more efficient.
  • Technology Applied – Ideally, with constant technological advancements, a vital feature to consider in a screen is the level of technology. Screens that feature modern technology designs will improve the screening process.
  • Flow Rate – Wastewater screens differ in terms of the flow rate they can accommodate. Considering the flow rate of a screen will ensure that you get the right screen for your specific application. Higher flow rates (than the screen’s rating) may potentially damage the screen.
  • Customization – If a screen can be customized for your specific application, without a doubt, the screen will function efficiently.
  • Screen Design – Preferably, the screen should feature a resistance welding design to guarantee its strength and durability.
  • Capture Rate – At the end of the day, the main reason for the screening is to capture potentially hazardous materials. Consequently, you should ensure that the screen has a high capture rate for it to carry out the screening effectively.
  • Construction Material – Most screens are constructed with either stainless steel or carbon steel to ensure durability.
Why Use Wastewater Treatment Screen?

Screening is a vital process in industrial or municipal wastewater treatment. Screening removes objects such as plastic, metals, fabric, debris, etc.

The main reasons for screening are to:

  • Prevent damage to the downstream equipment.
  • Reduce the chances of blockage of the downstream equipment.
  • Minimize the contamination of the water discharged from the water treatment plant.
  • Make the treatment process more effective and reliable.

The above reasons double up as the key benefits of wastewater treatment screens. Some additional benefits of using a wastewater treatment screen include:

  • Versatility due to a wide range of wire profiles to fit various applications.
  • Most screens can be customized as per your specifications.
  • Replacing wastewater screens is easy and fast, preventing any lengthy downtime.
  • Modern screens feature a self-cleaning design, significantly cutting on the maintenance cost and time.
  • Wastewater screens have a resistance welding design making them stronger and durable.
  • Also, the wastewater screens have a simple design that excludes components such as guides, sprockets, or bushings.
  • Several wastewater screens have a higher capture rate.
  • If the screen is correctly installed in the right application, it will offer less flow resistance. This, in turn, ensures continuous wastewater flow through the screen.
  • Lastly, the slots or openings for the screens are made with high precision to ensure that the screening process is effective.

Wastewater Treatment Screen Minimize The Chance Of Blockage Downstream

Wastewater Treatment Screen Minimize The Chance Of Blockage Downstream

Are There Limitations Of Wastewater Treatment Screen?

Wastewater treatment screens have a few limitations, but these do not overshadow their overwhelming benefits.

The commonly highlighted disadvantages include:

  • Some modern complex screens are difficult to install and may require expert help.
  • Manually cleaned screens require regular cleaning, increasing the need for maintenance.
  • The high precision required in making the openings in the screen may be demanding on the manufacturer’s side. Inaccurate slots will make the screen inefficient.
What Are The Types Of Screens In Wastewater Treatment?

You know what they say about variety; it is the spice of life. Putting this in context, variety in terms of wastewater treatment screens makes the screening process more efficient.

Let’s look at the various types of screens used in wastewater treatment and how they compare.

Perforated Plate Screen For Wastewater

As the name suggests, the screening media for a perforated plate screen is simply a plate panel that has perforations (openings).

Modern perforated plate screens have a step design, allowing for the automatic cleaning of the screens at the discharge point.

These types of screens capture solids from the wastewater.

Next, the step design transport the captured solid to the rear of the unit for disposal.

Upon discharge of the solids, the screens are automatically cleaned by a brush and a spray.

Perforated Plate Screen

Perforated Plate Screen

Band Screen For Waste Water

Band screens comprise a series of perforated plates. This makes these types of screens have a high capture rate of up to 80 percent.

Notably, band screens remove various objects and materials for the wastewater, including fine materials, rags, metals, bags, etc.

Additionally, wipers can be integrated into a band screen to aid in the removal of large objects such as cans or bottles.

Wastewater Band Screen

Band Screen For Wastewater

Bar Screen For Wastewater

Bar screens can be categorized under coarse screens.

Structure-wise, bar screens are made up of vertical bars – spaced between 1 to 3 inches apart.

Generally, bar screens help in removing large objects such as plastics and rags from the wastewater.

If the screens are sequentially placed, the bar screen comes ahead of the other screens.

In screening, the large objects are first removed, followed by the remaining finer materials.

Depending on the design, bar screens can be automatically cleaned or manually cleaned using a hard rake.

Bar Screen

Bar Screen

Mechanical Bar Screen For Waste Water

A bar screen is a piece of heavy-duty screening equipment with a rake that constantly removes the debris or the materials trapped on the screen.

Mechanical bar screens are typically classified into two:

1. Single Rake Mechanical Bar Screen – It features a fixed bar rack anchored within the channel, with openings greater than 1 inch. The screening materials are lifted out of the channel by a rake arm.

One major advantage of the single rake mechanical bar screen is removing screening materials from deep channels. However, it is prone to jam, and maintenance is not easy due to the inaccessibility of some parts.

Single Bar Mechanical Screen

Single Bar Mechanical Screen

2.Multi-Rake Bar Screen – This is the modern-day mechanical bar screen featuring multiple rakes for increased efficiency.

This specific mechanical bar screen is easier to maintain, durable, and has a more effective raking system.

Regardless, it is also prone to jam, and some parts are also inaccessible making maintenance difficult.

 Multi Bar Screen

Multi Bar Screen

Inlet Screen For Wastewater

An inlet screen essentially acts as a pre-treatment device in a wastewater treatment plant. This is not specifically a type of screen but is instead a broader category of the screens located at the wastewater treatment plant’s inlet.

Screens such as drum screens and screw screens can be classified as inlet screens. It’s worth noting that most inlet screens are coarse screens.

Coarse Screen For Waste Water Treatment

Wastewater comprises a number of objects that vary in size; there are larger materials and smaller/fine materials.

The coarse screen majorly traps the larger objects and removes them from the wastewater. Also, the main materials it removes include debris, metals, rags, and any other larger solids.

Typically, they have openings measuring not less than 0.25 inches.

If you are to arrange the screens sequentially, you will start with the coarse screen, the fine screen then the micro screen

Fine Screens For Wastewater Treatment.

Unlike the coarse screens, these types of screens have openings ranging from 0.06 to 0.25 inches. They trap objects that the coarse screen permitted to pass.

Micro Screens For Wastewater Treatment

The openings on the micro screens are less than 0.06 inches. These screens trap the finest materials that either coarse or fine screens couldn’t trap.

Inclined Rotary Drum Screen

 Inclined Rotary Drum Screen

 Inclined Rotary Drum Screen

As the name implies, a rotary drum screen is a drum-shaped screening device.

It is hollow (has openings on its top and bottom parts), while the sides are fitted with sieves.

The rotary drum screen is usually horizontally placed in the system.

Wastewater is channeled into the drum, which is in a constant rotating motion. Inside the drum, water is allowed to pass through the sieves while the solids are screened out.

Commonly, rotary drums are fitted with an auger that carries the trapped solid waste to the end of the drum.

Consequently, the solid waste is emptied from the rotary drum.

Alternatively, other rotary drums are cleaned by spraying water from the outside of the screen.

The advantages of a rotary drum screen include:

  • High capture rate
  • Minimal maintenance
  • Simple and efficient

Continuous Filter Screen

The continuous filter screen is ideal for fine screening. It has a belt screen that filter the wastewater.

This screen can feature either a single belt or a double belt design.

Typically, the continuous filter screen is suspended using a crane system.

The filter screen has filter elements (made out of special plastic) placed on a stainless steel shaft- supported to the frame. Consequently, wastewater is screened as it flows through the screen.

Notably, this specific filter screen has no moving parts; thus, it is easy to use and maintain.

Coanda Screen

A Coanda screen uses a slanted design to filter raw or wastewater. For a better understanding, below is a simple diagram of the Coanda screen.

A Coanda Screen

A Coanda Screen

From the above diagram,

Typically, the approach plate channels the water to the filter screen. As the wastewater flows onto the filter screen, water goes below the filter screen while the debris remains on the filter screen.

The filtered water will then exit the Coanda screen via the outlet. For the debris, they will slide down the filter screen.

Notably, the coanda screen’s efficiency depends on the mounting angle and the span or length of the filter screen.

Also, these screens are widely used in flowing water bodies such as rivers.

Some key benefits of Coanda screens include;

  • Constant supply of screened water.
  • The screens are self-cleaning, thus reducing the maintenance cost.
  • Lack of moving parts which also lowers the maintenance cost.
  • High corrosion resistance

Sieve Bend Screen

The sieve bend screen is a concave curved screen. Generally, v-shaped wires are welded to support rods to construct a sieve bend screen.

In a way, the operation of the sieve bend screen is similar to that of the Coanda screens.

The wastewater flows against the sieve bend screen in the direction indicated by the arrow. Consequently, the water is sieved, and the debris is collected in the lower part (Part A).

The common advantages of these types of screens include:

  • High dewatering capacity
  • Low clogging probability
  • Durability
  • Low maintenance requirement
  • High rust and corrosion resistance

Spiral Screw Screen

The spiral screw screen has a simple design comprising a trough fitted with a perforated basket and a rotating screw.

Besides, the perforated basket permits water to pass through while the solid materials remain on the upper surface.

After which, the rotating screw transports the solid materials to the compaction zone, thereby automatically cleaning the screen.

Although this type of screening device is cost-effective, it does not have a high capture rate, plus the spiral cleaning mechanism can push the debris through the screen.

When Should You Replace Wastewater Treatment Screen?

The main reasons you may want to replace your wastewater treatment screen are:

  • If it is ineffective – no longer carrying out adequate screening on the wastewater
  • You want to generally make your screening more efficient.
  • If the screen is way too old.
  • You want to be at par with the advancements in the screening industry.
  • If your screen is damaged beyond repair.

You can either replace the screen with another screen of the same type or entirely go for a completely different type of screen. Your choice will mainly depend on:

  • The capture rate of the current screen
  • Modifications you will make if you were to install a new type of screen.
  • The water supply and pressure – whether the new screen type will work efficiently at the prevailing conditions.
How Does Bar Screen Compare To Wedge Screen In Wastewater Treatment?

Bar Screen

Bar screens are made by spacing vertical bars within 1 to 3 inches apart. These screens have large openings due to their design.

They are used in the first level of filtration to remove large solids like rags, plastics, and pumps. The removal of such objects is essential to prevent any clogging in the system.

Most bar screens are fitted with upward moving rakes to remove the materials trapped by the bar screen.

In terms of classification, you can place the bar screen under the coarse screen category.

Wedge Screen

In the case of wedge wire screens, they are made by arranging wedge wires in a triangular shape at regular intervals.

Their design makes them be able to trap finer materials from the wastewater. Also, the triangle shape makes it difficult for the screen to clog.

However, if by any chance the screen does clog, these types of screens usually feature a strong backwash effect.

Classification-wise, the wedge screen falls under the fine screen category.

What Is The Difference Between Perforated Plate Screen And Mesh Screen In Wastewater Treatment?

The simple difference of the two lies in their definitions.  Perforations are holes on a solid material, while the mesh is evenly spaced wires.

Difference Between Plate And Mesh Screen

Difference Between Plate And Mesh Screen

Thus deductively, a perforated plate screen is made by drilling or making holes on a metal plate.

Also, the hole sizes may vary depending on the specific application of the screen.

On the other hand, the mesh screens are constructed by equally spacing wires to permit water flow but trap solids.

Depending on the diameter of the wire, the solids can either be smaller or larger. If the wire used has a small diameter, the opening will be larger, permitting larger solids to pass through.

Notably, mesh screens are graded according to the number of holes per square inch.

Is There Recommended Size Of Wastewater Treatment Screen?

When looking at the size of the wastewater screen, we place a major focus on the openings on the screens.

Ideally, the screen openings are categorized into three:

  • Coarse Screens – These remove rags, large solids, and debris. Typically, they have openings measuring not less than 0.25 inches.
  • Fine Screens – Unlike coarse screens, these types of screens have openings ranging from 0.06 to 0.25 inches.
  • Micro Screens – However, there are finer screens (with openings less than 0.06 inches) placed after the less fine or coarse screens.

Most wastewater plants have all of these screens for more efficient screening. Notably, most modern design skins have all of these screen types to the screen installation.

The size of the screen will also depend on the specific water treatment application. For example;

  • Membrane Bioreactors (MBRs) and Integrated Fixed-film Activated Sludge (IFAS) need screens with finer openings.
  • Systems with pumps need mechanical rake-type screens, which are primarily coarse screens.
  • While water intakes and wastewater plants headworks will require finer screens with a high screening removal rate.
Which Is The Best Wastewater Treatment Screen Material?

The material used for wastewater treatment screen differs depending on the manufacturers.

Also, the type of screen will affect the choice of material.

Regardless, most screens are made out of stainless steel. However, the grades of stainless steel used also differ.

Some key reasons why stainless steel is preferred include:

  • Durability
  • Versatility
  • High corrosion resistance
  • Stainless steel is a relatively strong metal

Stainless Steel Is The Best material For Wastewater Screen

Stainless Steel Is The best Material To Make Wastewater Screens

Does Flow Rate Determine Design Of Waste Water Treatment Screen?

Yes, the flow rate is among the factors that determine the design of wastewater treatment screens. The recommended flow rates of the various screens differ depending on the type of the screens.

Below are recommended flow rates for the major types of wastewater screens:

  • Bar screens – The optimum velocity required is 0.6m/s. Also, the maximum velocity should range between 0.75 to 1.0 m/s to prevent any forceful passage of materials through the screen. Moreover, the minimum velocity should be 0.4 m/s to avoid any build-up of the materials.
  • Drum and disc screens – Most of these screens require a velocity of around 0.05 m/s for efficient functioning.
  • Coarse screens – These will require a velocity of not more than 0.9 m/s and not less than 0.4m/s to prohibit any solid deposition.
Where Should You Install Wastewater Treatment Screen?

Usually, the wastewater treatment screen should be installed at the inlet of an industrial or municipal wastewater treatment plant.

This is so because screening ought to be the first step in wastewater treatment.

Commonly, the screens can be installed in series forms for efficiency.

The first screen is usually the coarse screens (commonly bar screens).

This screen has fairly large openings, and its central role is to retain large solid materials such as rags, metals, and bottles.

From the coarse screen, the wastewater moves to the fine screen. The fine screens have smaller openings compared to the coarse screen.

Consequently, they trap smaller materials that pass through the coarse screen.

Finally, the wastewater passes through the micro screens. These screens have the smallest openings between the three-screen types.

They trap the finest materials from the wastewater.

Which Industries Use Wastewater Treatment Screen?

Commonly wastewater treatment screens are used in municipal and industrial wastewater treatment plants. The typical industries using these screens are:

  • Sewage treatment plants
  • Water-intake stations
  • Sewage pumping stations.
What Is The Design Criteria For a Mechanically Cleaned Wastewater Treatment Screen?

Bar screens are the common type of screens that feature mechanical cleaning designs.

Mechanically cleaned wastewater treatment screens differ in terms of design.

Below we highlight the common mechanical designs and their respective functioning.

  • Chain driven Wastewater Treatment Screens – These feature a back and forth moving raked chain that cleans the screen with every movement. This design can use multiple rakes.
  • Catenary Wastewater Treatment Screen – Comprises rakes suspended against the rack by the chain’s weight. Typically, it features a front clean, front return chain that cleans in continuous motion.

The rakes are not that rigid since they can pass over heavy objects jammed between bars, thus preventing further jamming.

  • Continuous Belt Wastewater Treatment Screen – As the name suggests, this design features continuously moving chains having multiple rakes attached to them. This design is ideal for both fine and coarse screenings.
  • Reciprocating rake / Climber Wastewater Treatment Screen – This is a simple design where the rake drives itself to the bottom of the screen, then carries the screenings as it moves back up. Once up, the screenings are removed.

Unlike the previous three mechanical designs, the climber design uses only one rake. As such, it has a significant drawback of not being efficient in applications with heavy screenings.

What Determines Quality Of Wastewater Treatment Screen?

When looking to purchase a quality wastewater treatment screen, there are some key elements that will help you gauge if the screen is quality. These include:

  • Capture efficiency – This shows how effective the screen is in capturing materials. A high capture rate translates to a quality screen.
  • Versatile – Versatility, in this case, is with regard to the ability of the screen to handle the variation in the medium velocity and screening concentration. A quality screen should function efficiently despite these variations.
  • Robust – Ideally, a quality wastewater treatment screen should be strong. This enables the screen to withstand any peak variations of the inflow pressure and the screening concentration.
  • Diversity – Finally, a screen that can be used in a number of applications is a quality one. Although specialization of a screen is regarded as more efficient, diversity remains ideal.
How Do You Maintain Wastewater Treatment Screen?

Wastewater treatment screens not only ensure efficient screening but also contribute to the durability of the wastewater screen.

As such, you should carry out regular maintenance on the wastewater treatment screen to ensure the optimal operation of your wastewater treatment plant.

Below are some critical maintenance practices for most if not all wastewater treatment screens:

  • Regular lubrication of the moving parts.
  • Recording and reviewing readings.
  • Inspect the screens for any damage or corrosion.
  • Cleaning the screens regularly to clear the debris – for the manually cleaned screens.
  • Greasing the bearings if the screen parts are movable.

To sum it all up, regular inspection is key in maintenance. It will help you catch any problem with the screen in time.

Additionally, adhering to the manufacturer’s manual when carrying out routine maintenance practice is also important to prevent any damage to the screen.

What Are The Components Of Wastewater Treatment Screens?

Wastewater treatment screens usually have a simple structure. Hence they do not have many parts.

Below are the typical components of a wastewater treatment screen.

  • Frame/Body – It is the part that holds the screen in place. For example, in the mesh screen, the frame holds the mesh.
  • Screen – This is the part that does the actual screening. It can be made from various materials, primarily wedge wires and metal bars. The screen has openings to permit water flow but restrict materials.
  • Cleaning mechanism – Most modern bar wastewater treatment screens have a mechanical cleaning system comprising of rakes and chains. For the other screens, there may be sprays to clean the screen.
How Does Wastewater Treatment Screen Work?

The operating mechanism of a wastewater treatment screen is quite straightforward.

Usually, the screen is either installed on the inlet of the wastewater plant or in a strategic path of flow of the wastewater.

As such, the screen obstructs the flow of water, forcing the wastewater to pass through it. As the water passes through the screens, materials larger than the screen’s opening are restrained.

Depending on the cleaning mechanism of the screen, the captured screenings are either removed from the screen manually or mechanically.

What Determines Efficiency Of Wastewater Treatment Screen?

The efficiency of a wastewater treatment screen is dependent on some key factors, including:

  • Application of the screen
  • The speed of flow or velocity of the water
  • Size of the screenings
  • Composition of the screenings

The above-mentioned factors will help you choose the correct screen and also ensure that the screen operates efficiently.

Additionally, regular maintenance also contributes greatly to the efficient operation of a wastewater treatment screen.

Can You Repair Wastewater Treatment Screen?

Yes, you can repair certain parts of a wastewater treatment screen including the spray nozzles, brushes, rakes, grid panels, and wiper blades.

However, when repairing such parts, ensure you use parts that your screen’s manufacturer has approved.

In some instances where the screening material is totally damaged, you will purchase a new screen.

How Much Does Wastewater Treatment Screen Cost?

There is no precise pricing for all the wastewater treatment screens. The price variation depends on the:

  • Type of screen
  • Sophistication or technology employed on the screen
  • Materials used to make the screen
  • The size of the entire screen

Generally, a wastewater treatment screen price can be as low as $800 to a peak of $50,000.

How Does Coarse Screen And Fine Screen For Wastewater Treatment Compare?

Coarse and fine screens differ in terms of the size of their openings. Coarse wastewater treatment screens have slots not measuring less than 0.25 inches. They capture large solids present in the wastewater, such as rags, bottles, etc.

On the other hand, fine screens have openings with sizes ranging between 0.06 to 0.25 inches.

The other difference between the two screens is concerning the structure or design. Fine screens are mostly perforated or have wire mesh, while coarse screens are made of steel bars.

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