A system for treating wastewater comprising a coagulation-flocculation assembly having a raw wastewater inlet and a coagulated-flocculated wastewater outlet; and a slurry separator comprising an intake area configured for receiving wastewater slurry from the coagulated-flocculated wastewater outlet, a liquid outlet, a sludge outlet, and a filtration module configured to facilitate percolating of liquid therethrough and forming of a filter cake thereon. The slurry separator being configured to receive slurry at the intake area, separate the slurry to liquid and sludge by the filtration module, remove the liquid via the liquid outlet, and convey the sludge from the intake area to the sludge outlet. The system further comprises a level maintaining arrangement configured to maintain at least a minimal level of the filter cake.

A food processing water filtration apparatus includes a rotatable drum, a source of liquid, a blade to remove solids from the drum, a drain, and a rotational drive. The system has one or more of a plurality of flights affixed to the drum, a source of mixing gas connected to the source of liquid, a source of cleaning gas connected to nozzles disposed inside the drum, and a trunnion support for an end of the drum. The drum is cylindrical and at least partially comprised of a screen. The source of liquid directs liquid towards the screen and into the drum. The drain collects at least a second portion of the liquid that passes through the screen and out of the drum. The outlet is at one or both ends of the drum. The rotational drive is connected to an end(s) of the drum, and rotates the drum.

A liquid (2), such as wastewater, is filtered using a liquid-permeable filtering element (9) having first and second faces (10, 11) so as to produce filtered liquid (4) having total suspended solids of no more than 10 mg/L. The method comprises cycling the liquid-permeable filtering element through the liquid whereby, in a first position, an area of the first face of the filtering element is subjected to liquid under pressure and a pressure across the filtering element is greater than 0 and less than or equal to 5.9 kPa (60 cmH2O), and, in a second position, the area is not subjected to liquid under pressure or is subjected to liquid at a lower pressure, and solids accumulated on the first face of the filtering element can be removed by directing at least one jet at the second face of the filtering element through the filtering element towards the first face.

In the management of a facility pumping water from a natural environment containing impurities, the facility makes use of at least one rotary filter purifying the pumped water while some impurities at least partially clog the rotary filter. In particular, provision is made for estimating an evolution over time of a pressure loss caused by impurities clogging the rotary filter, based at least on data relating to the natural environment, dimensions of the rotary filter, and local measurements relating to at least one water level N.sub.amont upstream of the filter and to a flow rate of water Q.sub.aspiré drawn in downstream of the filter. Such an estimate of the evolution over time of the pressure loss makes it possible to anticipate possible risks of insufficient water supply to the pumping system (POM) downstream of the filter (FIL), or even to design filters (FIL) adapted to the needs of specific pumping facilities.

According to various aspects and embodiments, a system and method for two-stage filtration is provided. The system includes an inlet fluidly connectable with wastewater, a first stage filter assembly that is fluidly connectable with the inlet and has a rotary drum with a filter surface configured for radially inward fluid flow, a second stage filter assembly that is fluidly connectable with the first stage filter and has a plurality of filter discs configured for radially outward fluid flow, and an outlet fluidly connectable with filtrate generated by the second stage disc filter assembly.

There are provided a sludge treatment device 100 and a sludge treatment system 400 comprising: a primary tank 110 into which a liquid flows from a machine tool 300 side; a secondary tank 120 from which a liquid inside flows out to the machine tool 300 side; a first flow path 130 that supplies the liquid in the primary tank 110 to the secondary tank 120; a filter 134 disposed on the first flow path 130; a second flow path 140 different from the first flow path 130 connecting the primary tank 110 and the secondary tank 120; and a liquid inflow amount adjustment means 142 configured to adjust an inflow amount of liquid flowing from the secondary tank 120 into the primary tank 110 through the second flow path 140, wherein a second flow path liquid supply path 150 is provided to cause the liquid in the primary tank 110 to flow from the secondary tank 120 side toward the primary tank 110 side from a middle of the second flow path 140.

A liquid solid separator has a main container wherein a rotating filter belt receives influent for liquid sold mixture sieve processing. Various recirculation systems are proposed including an external pump sump, internal pump recirculation and dual pumps with one disposed externally in a sump and one internally in the lower basin of the container. Recirculation points include an inflow pipe connection, an influent basin connection located above the influent basin and influent basin connection located underneath the liquid solid mixture influent level.

A liquid solid separator has a main container wherein a rotating filter belt receives influent for liquid sold mixture sieve processing. A filtered water collections tank, a pressurized water supply are sources of wash water inputs. Cold and hot water pressurized water supplies are also potential supply sources. Load balancing of inputs and single and dual wash water pumps are also described.

According to various aspects and embodiments, a system and method for two-stage filtration is provided. The system includes an inlet fluidly connectable with wastewater, a first stage filter assembly that is fluidly connectable with the inlet and has a rotary drum with a filter surface configured for radially inward fluid flow, a second stage filter assembly that is fluidly connectable with the first stage filter and has a plurality of filter discs configured for radially outward fluid flow, and an outlet fluidly connectable with filtrate generated by the second stage disc filter assembly.

According to various aspects and embodiments, a system and method for two-stage filtration is provided. The system includes an inlet fluidly connectable with wastewater, a first stage filter assembly that is fluidly connectable with the inlet and has a rotary drum with a filter surface configured for radially inward fluid flow, a second stage filter assembly that is fluidly connectable with the first stage filter and has a plurality of filter discs configured for radially outward fluid flow, and an outlet fluidly connectable with filtrate generated by the second stage disc filter assembly.