A screw press operates first, having a feed slurry enter the center of the unit. The decanter centrifuge contains a horizontal cylindrical bowl, and it is equipped with an internal scroll conveyor, which rotates at a high rate of feed. The bowl and conveyor rotate at different speeds, this allows the conveyors to push solids up the incline of the bowl and out the end of the centrifuge, while the filtered liquid exits out the other end of the centrifuge.
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A Filter Press operates by having the feed slurry enter the center feed pipe and fill all of the chambers of the filter press. As the feed pump continues to push more pressure, and more slurry into these chambers, the solids begin to build on the filter press cloth. As these solids are forced into the chambers by the feed pump, they displace or push the water through the filters. The filters have a very tight weave, often 2-3 micron, so the solids cannot pass through and instead continue to pack themselves onto the cloth and push the water through the filter. The filter press is full when the chambers are full of solids.
Met-Chem's Filter Press Feasibility Test is our most popular and common test conducted in our lab. This test is performed to ensure that a filter press is able to filter solids properly with your specific application. The test will allow us to determine cloth sizing and if any Filter Aid will be required for your slurry. With less than a gallon of your typical wastewater, we can see if a filter press will provide the desired result. We will then send you the filtrate (liquid) as well as the solids that we are able to separate from your waste stream. The filter press test will also provide information to estimate the percentage of solids in order to properly size a filter press unit.
In the diagram below, Met-Chem was able to take a sample slurry and filter the liquid from the solids.
The Met-Chem Fully Automatic Plate Shifter allows you to empty the filter press with little to no operator presence. With large filter press plates, it would take two employees to move each plate and empty the filter press. The plate shifter reduces labor costs, improves efficiency, and it is safer than other shifters. As a result, the fully automatic plate shifter will Save You Money.
For added safety, a light curtain can be added. If a person or an object breaks the plane of the curtain, the shifter will automatically stop.
Met-Chem can add-on, rebuild and retrofit your existing filter press with a Fully Automatic Plate Shifter.
The Fully Automatic Plate Shifter uses a PLC control panel to automatically empty the filter press. The load sensing carriage will grab and shift each plate, and it will allow the sludge to fall. This is a great time saver for companies that want their employees doing more productive work than emptying the filter press. Watch the video to see the fully automatic plate shifter in action.
The automatic pump control system automatically and gradually increases the feed pressure in four stages during the filling cycle. These stages are adjustable to suit your slurry and solids concentration. However, it is commonly set at increments of 25 psi. (25, 50, 75, 100). By monitoring the feed pump flow sensor, during the final pressure stage, the operator will be able to determine the cycle completion.
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The Automatic Pump Control System also incorporates a low hydraulic pressure safety shut down the device. If there is not enough hydraulic clamping pressure present, the system will completely shut down, eliminating any possible leaking from between the filter plates.
The pump control system allows your filter press to run at its optimum efficiency creating dryer filter cakes, reducing disposal costs, reducing operator time, and increasing the life of your filter cloths and feed pumps.
This system can be incorporated with a new Filter Press from Met-Chem, a used unit, or even your own existing press.
A filter press (FP) provides sludge dewatering by pressing the sludge between a series of porous plates. The process forces water from the sludge by applying high pressures to sludge layers held between a series of 20'80 rectangular plates. The plates are recessed to allow them to be filled with sludge, and a filter cloth with an effective pore size of less than 0.1 mm fitted to each.
The FP is the only mechanical thickening or dewatering technology that is limited to batchwise (rather than continuous) operation. It is also the only dewatering technology capable of routinely achieving high concentrations of the dewatered solids cake
product ' between 35 and 45% DS (dry solids) depending on the feed sludge origin and the chemical conditioning applied.
Operation of the filter press proceeds by slowly filling the recesses between the plates with the sludge before applying pressures of 7'20 bar over a period of 1'2 hours. The water is forced out of the sludge under the pressures applied, the filtrate being returned to the wastewater treatment works influent.
Air is then flushed through the system for 5'15 minutes to displace most of the residual water from the cake formed in the recesses. The filter cake may also be washed at this point to remove contaminants. The plates are then separated and the cake solids, 25'40 mm thick, allowed to fall out. The complete operating cycle of filling, filtering and emptying, and washing down the press can take up to five hours.
A modification of the standard FP is the diaphragm/membrane press. In this technology, a flexible diaphragm is sandwiched between the filter cloth and the supporting plate. This provides additional dewatering by pressurising the diaphragm (up to ~20 bar) at the end of the pressing cycle to expand the diaphragm and provide further pressure on the cake trapped in the recesses.
Are you interested in learning more about filter press for sludge dewatering? Contact us today to secure an expert consultation!