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Evoqua JWI J-Press Filter Press

Langley Separation & Process has many years of mechanical filter press knowledge and process experience and represents the complete range of Evoqua Filter Presses including JWI, J-PRESS®, US Filter, Perrin, Siemens and other brands of filter presses. For over 40 years Evoqua filter presses have been industry leaders in wide variety of dewatering applications or any process that requires a separation between liquid and solid suspension. From conventional industrial waste sludge to high solids mineral processing applications, Evoqua has the equipment to meet your dewatering needs. Additionally, Langley Separation and Process can engineer a turnkey dewatering system, as well as customize cost-effective preventive maintenance and support programs for your specific equipment, application, and / or facility requirement.

J-Press filter presses on shop floor

Filter Press Definition:

The primary usage of a filter press is as a “fixed volume, batch pressure filter” built to hold a specific quantity of solids. The term “batch” refers to the fact the cycle must be stopped to discharge the collected “filter cake” prior to restarting a cycle. “Pressure” is created by the feed pump in the separation process. The filter press may also be used as a “polishing” filter to remove minute solid particles from an influent or effluent stream. In these applications the press is not sized for the quantity of solids holding capacity but for maximum filtration area and hydraulic capacity. When used as a polishing filter, a dry filter cake is not generally developed and when the flow rates drop to an unacceptable level, the cycle is stopped. Another common use for a filter press is as a “variable volume” filter that uses a filter plate known as a diaphragm or membrane plate. This type of plate has a flexible drain-field which when sealed around the edges forms an integral bladder or diaphragm that may be inflated to physically press additional liquid from the filter cake. This process can significantly reduce the typical elapsed time for a press cycle and produce a dryer cake and more consistent cake dryness from cycle to cycle.

The Principle:

The pressure forcing the slurry (typically 100-psi, but up to 900-psi [7 to 60-bar]) is generated by a feed pump either a positive displacement or centrifugal pump. With a gravity drain on the filtrate side of the press, a pressure differential between the feed pressure and the gravity discharge is created across the media and the filter cake solids as the cake thickness increases. It is this pressure differential, not just the feed pump pressure, that causes the filtering action to occur. Solids within the slurry will flow to the area of cake development with the lowest pressure differential, resulting in a filter cake that builds uniformly over the drain-field on either side of the chamber walls. This fill cycle continues until the filter cake forming on the chamber walls bridges at the center, completely filling the press with solids and ending the filtration process. The hydraulic closure of the press is then retracted and the individual filter elements are separated discharging the filter cakes by gravity into an appropriate receptacle.

Process:

During operation the slurry is pumped under pressure into the press chambers through the manifold at the stationary head of the filter press. As each chamber fills with slurry, the liquid passes through the cloth medium, across the drain-field, through the drain ports and exits via gravity from the corner discharge ports. The prime function of the filter media is to provide a porous support structure for the filter cake to develop and build upon. Initially, some solids may pass through the cloth media causing a slight turbidity in the filtrate, but gradually the larger particles within the slurry begin to bridge the openings in the media reducing the effective opening size. This allows smaller particles to bridge these reduced openings initiating the cake filtration process. Once a layer of solid particulate achieves a 1 to 2 mm in thickness, this “precoat” layer serves to separate out finer and finer particles as the cake builds in thickness, yielding a filtrate that is very low in turbidity.

The following are important considerations when selecting and/or sizing a filter press:

  1. Volume per day
    • The volume of slurry generated per day is also used in the calculation of the mass of dry solids per day to be dewatered.
  2. Hours of filter press operation per day
    • The size of the filter press is also determined by the hours per day it can be operated. The cake from a filter press can be dropped 6 times per 24 hour period with a 4 hour press cycle. If the filter press is operated only 12 hours per day it can only run three 4 hour cycles which results in the size of the press being 2 times larger.
  3. Specific gravity of slurry
    • The specific gravity is the weight per unit volume (i.e. pounds/gallon) of slurry and can significantly vary from application to application. It is used to accurately calculate the mass of dry solids per day to be dewatered.
  4. Wet cake density
    • The density of the filter cake varies from application to application and is used to accurately calculate the volume of filter cake generated. The density of the filter cake is also used to advise if extra support is needed in the structure of the filter press.
  5. Temperature of slurry
    • The temperature of the slurry is used to select the appropriate materials of construction of the filter press as well as to determine its operating parameters.

A Filter Press has two principal components:

This is true for all filter presses of the regardless of design including both the sidebar and overhead plate suspension type filter presses.

Filter Press Components:

The skeleton has one primary function which is to hold the filter pack together against the pressures developed internally during the filtration process. The terms used to describe the skeleton may vary slightly from manufacturer to manufacturer, but the sub-components remain essentially the same:

An 800mm Evoqua JWI J-Press filter press with drip trays and a plate shifter
An 800mm Evoqua JWI J-Press filter press with drip trays and a plate shifter

The J-Press filter press was the first to feature a single design that included:

The J-Press filter press quickly set the benchmark for filter press performance and today the Evoqua JWI J-Press filter press offers the most advanced automation available, from fully automatic plate shifting and cloth washing to PLC controls plus a full complement of ancillary slurry processing and cake handling system components. Adaptability to applications, processes and capacities are the underlying values of the JWI J-Press filter press.

J-Press filter press

Considered by industry professionals as the premier filter press, the J-Press filter press combines rugged construction, precision engineering, ease of operation plus a wide range of features and options to tackle the most difficult dewatering problems. These automated J-Press filter presses are key systems in municipal and industrial facilities around the world.

Evoqua JWI J-Press filter press features include:

J-Press filter press with piping

The J-Press high performance filter press is available in three different frame designs with plate sizes ranging from 1.2 m x 1.2 m to 2.4 m x 2.4 m. The Sidebar filter press, the Overhead Compression Close filter press and the Overhead Tension Close filter press each offer fully automatic operation. Their unique construction and features make these large presses the best solution when balancing the requirements of the application with economies of the project.

Sidebar Compression Close:

A single hydraulic cylinder keeps the filter pack closed while in the compression stroke. Filter plates are suspended by the plate handles resting on the sidebar.

Sidebar Compression Close diagram

Advantages of Sidebar Compression Close:

Small J-Press Sidebar Filter Presses

The Small Capacity J-Press Filter Press is the cost-effective solution for producing high solids filter cake with extremely high clarity in the liquid effluent. Considered by industry professionals as the premier sidebar filter press, the J-Press filter press combines rugged construction, precision engineering, ease of operation and a wide range of features and options to tackle the most difficult dewatering problems. The J-Press filter press is one of the most versatile dewatering devices on the market, being used in a wide variety of industrial and municipal applications. The J-Press filter press can be used to recover both solids and liquids from a waste or process stream. With superior materials of construction, the J-Press filter press is especially useful in the dewatering of aggressive acid and alkali suspensions.

Small J-Press Sidebar Filter Press

Automation Options Available The Small Capacity J-Press® Sidebar Filter Press can be fully automated to produce high solids filter cake with extremely high clarity in the liquid effluent. Available in a wide range of sizes and styles, the Small Capacity J-Press Filter Press can be configured to provide a dewatering solution to most all process flows from as little as 25 gallons to 1,000,000 gallons per day. It produces consistent results under varying influent conditions.

JWI J-Press Sidebar Filter Press

J-Press Larger Sidebar Filter Presses feature a heavy-duty carbon steel frame engineered to provide maximum rigidity for clamping forces exceeding 800,000-lbs. The J-Press side bar is available with 100-psi (7-bar), 225-psi (6-bar) or higher pressure configurations, with plate size and respective hydraulic capacities ranging from 1-m to 2-m x 2-m. The Large Capacity J-Press® Sidebar Filter Press robust features are engineered for long-term dewatering performance under the most demanding industrial municipal applications; a full complement of feed pumps, plate shifters, manifolds, and controls ensures efficient operation with minimal operator requirements. In addition, options for pretreatment, automatic cake release, cloth washing, material handling and safety features can be incorporated into a J-Press dewatering solution.

Sidebar Compression Close Unit Features and Benefits:

Overhead Compression Close:

A single hydraulic cylinder keeps the filter pack closed while in the compression stroke. Filter plates are suspended by hangers from the overhead beam flange.

Overhead Compression Close diagram

Advantages of Overhead Compression Close:

Overhead Tension Close:

Hydraulic cylinders on all four corners keep the filter pack closed while in the tension stroke. Filter plates are suspended by hangers from the overhead beam flange.

Overhead Tension Close diagram

Advantages of Overhead Tension Close:

J-Press Overhead Tension Filter Press

J-Press® Overhead Filter Presses incorporate proven technologies in compression and tension designs and are the workhorse of high volume dewatering. Both bear the J-Press hallmark of exceptional performance under the most demanding applications, ease of use and minimal maintenance. In short, J-Press is engineered to deliver your greatest return on investment.

J-Press Overhead Tension Filter Press

J-Press delivers high cake solids and clear filtrate, even with difficult alum sludge in municipal water production. Its solid, heavy steel construction is enhanced by intelligent design that permits easy access to all plates and operating parts. Available in a wide range of capacities and with feed pressures up to 20-bar, J-Press may be configured to your specifications for press filling, plate technology, dewatering, cake discharge, automation and takeaway. J-Press can adapt to different dewatering requirements, often with minimal change over, making it ideal for the flexibility often required in industrial processing. Available with comprehensive options, J-Press is designed to accommodate future expansions and continuous system improvements.

Overhead Tension Close Unit Feature & Benefits:

Langley Separation and Process offers two options and/or both to help you determine the right filter press for your application or optimize your current filter press:

Small J-Press Sidebar Filter Press

Pilot units are essential for testing your process and proving out your specific dewatering or filtering application. On site pilot unit testing provides the opportunity to test a variety of conditions, configurations and operating parameters. Langley Separation and Process can assist with setting up and running the pilot equipment to determine the optimal filter press configuration and operating conditions.

Langley Separation and Process can arrange for a rental pilot press from Evoqua. These pilot presses are available in a variety of sizes from benchtop to 1200 mm and come complete with press, filter cloths and a feed pump. All you need to do is add an air supply, connect your feed tank and start testing.

Available Evoqua Rental and Pilot Unit Filter Presses:

250 mm

470 mm

630 mm

800 mm

Langley Separation and Process can also assist with optimizing your current unit, planning a production change or working through a filter press problem. If you are experiencing issues with filter cake or filtrate quality, making the changes necessary to investigate the problem can be difficult if you can’t take your filter press offline. So if you want to test different treatment chemistries, filter cloths, or changing cycle parameters then renting a pilot unit makes perfect sense. They operate offline so there’s no impact on production and because they’re small it makes it possible to evaluate new materials and processes at lower cost.

Langley Separation and Process working with Evoqua’s world-class service network and technical resources will keep your project moving and help you make the transition from pilot solution to fully-equipped process system. And once your evaluation is complete, scaling up to a new Evoqua system is simple and virtually hassle-free because Evoqua pilot presses are nearly identical to production systems.

Evoqua lab techs in lab
Evoqua lab tech holding test paper with dry cake and water

Langley Separation and Process can assist with submitting customer samples to the Evoqua in-house lab for testing. Evoqua maintains a fully staffed, state-of-the-art laboratory for determining the most effective liquid/solids separation techniques for each specific application. Evoqua will determine the most effective sludge conditioning, feed pressures, fill times, filter media, and filter cloths and press size for each customer.

In addition to ensuring a better informed equipment purchase, this customer-focused service will also help you maintain maximum performance of your J-Press® filter press.

Laboratory Testing Analysis includes:

To learn more, visit http://www.evoqua.com/en/brands/JWI/Pages/Laboratory-Services.aspx.

Or to schedule services performed by our unique, state-of-the-art testing lab, please contact us.

Filter Press Parts and Service:

Langley Separation and Process can provide service and supply spare parts as well as an extensive selection of filter press cloths and filter press plates for Evoqua JWI, US Filter, Perrin, Siemens, Passavant, IPM and other brands of filter presses, plus parts for dryers including the JWI brand J-Mate® Dryer. We can even supply filter press accessories like cloth washers, drip tray, air blow, air hammers and much more.

Evoqua Filter Press parts

And if you are already an Evoqua customer Langley Separation and Process can help you with Evoqua’s new ToolDox® service portal. Evoqua’s secure ToolDOX®platform provides access to your dewatering equipment’s original OEM information by using the equipment’s unique serial number to view O&M manuals with exploded-view drawings including live parts look-up and built-in parts & service RFQs.

ToolDOX logo

Langley Separation and Process can deliver individual filter presses and / or complete dewatering systems featuring custom automation / control panel, pumps, pipe work, feed / receiving tanks, polymer systems, mixers, skid packages, discharge augers, platforms and other accessories and options.

A CAD rendering of a complete dewatering system

Frequently Asked Questions

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