Provided are a sewage treatment system using a multistage long-fiber filtering device, and a treatment method thereof. The sewage treatment system uses at least one pressurized long-fiber filtering device and at least one submerged-type long-fiber filtering device to treat sewage by a direct filtration method. The pressurized long-fiber filtering device treats sewage by direct filtration, and the submerged-type long-fiber filtering device treats the sewage by concentrating backwashing water of filtered sewage and dehydrating and disposing of the backwashing water. The pressurized long-fiber filtering devices and the submerged-type long-fiber filtering devices are respectively provided in a modular including a plurality of the devices in a symmetrical structure to each other. Accordingly, as sewage is treated by direct filtration by using the pressurized long-fiber filtering device and the submerged-type long-fiber filtering device, greenhouse gases may be reduced without microbial treatment.

A method of treating an animal skin substrate comprising: agitating the animal skin substrate with a solid particulate material and a treatment liquor; separating the animal skin substrate from effluent comprising the solid particulate material, the treatment liquor and solid waste fragments derived from said substrate; transferring the effluent to a first separator, wherein the first separator is configured to allow the treatment liquor and at least a portion of the solid waste fragments to pass through the first separator but to prevent the solid particulate material from passing through the first separator, and providing a first filtrate stream comprising treatment liquor and solid waste fragments and a first residue comprising solid particulate material and residual solid waste fragments treating said first residue to remove said residual solid waste fragments to provide cleaned solid particulate material, wherein said treating of said first residue comprises retaining said solid particulate material on a surface of a treatment separator during said treating, wherein the treatment separator is configured to allow liquid and residual solid waste fragments to pass through but to prevent the solid particulate material from passing through; and (i) directing a cleaning formulation onto said solid particulate material to provide a second filtrate stream comprising said cleaning formulation and said residual solid waste fragments and a second residue comprising cleaned solid particulate material; and/or (ii) agitating the treatment separator.

A method of treating an animal skin substrate comprising: agitating the animal skin substrate with a solid particulate material and a treatment liquor; separating the animal skin substrate from effluent comprising the solid particulate material, the treatment liquor and solid waste fragments derived from said substrate; transferring the effluent to a first separator, wherein the first separator is configured to allow the treatment liquor and at least a portion of the solid waste fragments to pass through the first separator but to prevent the solid particulate material from passing through the first separator, and providing a first filtrate stream comprising treatment liquor and solid waste fragments and a first residue comprising solid particulate material and residual solid waste fragments treating said first residue to remove said residual solid waste fragments to provide cleaned solid particulate material, wherein said treating of said first residue comprises retaining said solid particulate material on a surface of a treatment separator during said treating, wherein the treatment separator is configured to allow liquid and residual solid waste fragments to pass through but to prevent the solid particulate material from passing through; and (i) directing a cleaning formulation onto said solid particulate material to provide a second filtrate stream comprising said cleaning formulation and said residual solid waste fragments and a second residue comprising cleaned solid particulate material; and/or (ii) agitating the treatment separator.

A filtration recovery device according to the present disclosure may include: a filtration filter having a plurality of through-holes; and a holder having an introduction port configured to introduce a liquid, a discharge port configured to discharge the liquid, and a flow path configured to communicate the introduction port and the discharge port with each other, in which the filtration filter is disposed in the flow path between the introduction port and the discharge port of the holder.

A filtration recovery device according to the present disclosure may include: a filtration filter having a plurality of through-holes; and a holder having an introduction port configured to introduce a liquid, a discharge port configured to discharge the liquid, and a flow path configured to communicate the introduction port and the discharge port with each other, in which the filtration filter is disposed in the flow path between the introduction port and the discharge port of the holder.

A multi-zoned paddle screen apparatus 100 is disclosed for separating fiber from a liquid medium during, for example, a grain wet mill or dry grind process. The apparatus includes a housing 106 having first and second zones 108a, 108b situated adjacent one another along a length (L) of the housing 106. First and second screen sections 102a, 102b having a plurality of openings 104 may be situated lengthwise within the housing 106 corresponding with the first and second zones 108a, 108b, respectively. The first and second screen sections 102a, 102b have a circular cross-section, and the second screen section 102b has a larger diameter than the first screen section 102a. An elongated shaft 130 situated lengthwise within the screen sections 102a, 102b includes first and second conveyors 128a, 128b, which correspond with the first and second zones 108a, 108b, respectively, having a plurality of paddles 132. Each conveyor 128a, 128b is configured to move material in a direction along a length of the screen 102a, 102b. There may be more than two zones 108a, 108b.

A multi-zoned paddle screen apparatus 100 is disclosed for separating fiber from a liquid medium during, for example, a grain wet mill or dry grind process. The apparatus includes a housing 106 having first and second zones 108a, 108b situated adjacent one another along a length (L) of the housing 106. First and second screen sections 102a, 102b having a plurality of openings 104 may be situated lengthwise within the housing 106 corresponding with the first and second zones 108a, 108b, respectively. The first and second screen sections 102a, 102b have a circular cross-section, and the second screen section 102b has a larger diameter than the first screen section 102a. An elongated shaft 130 situated lengthwise within the screen sections 102a, 102b includes first and second conveyors 128a, 128b, which correspond with the first and second zones 108a, 108b, respectively, having a plurality of paddles 132. Each conveyor 128a, 128b is configured to move material in a direction along a length of the screen 102a, 102b. There may be more than two zones 108a, 108b.

The present invention discloses a method for self-cleaning filters without having to open the filter housing. Wash nozzles are integrated with the filter housings such that when the filters are clogged, both back-wash and regular washing can be performed with practically no down time. Moreover, without opening the filter housing, the hazardous components of the fluid to be filtered can be contained and dealt with before they escape the filter housing, thereby significantly reduces the environmental impact and harm to the working crew.

The present invention discloses a method for self-cleaning filters without having to open the filter housing. Wash nozzles are integrated with the filter housings such that when the filters are clogged, both back-wash and regular washing can be performed with practically no down time. Moreover, without opening the filter housing, the hazardous components of the fluid to be filtered can be contained and dealt with before they escape the filter housing, thereby significantly reduces the environmental impact and harm to the working crew.

A filtration recovery method for filtering and recovering a liquid containing a filtering object that includes: sinking a filtration recovery device including a filtration filter having a plurality of through-holes, an inlet for introducing the liquid, an outlet for discharging the liquid, and a holder having a flow path communicating the inlet and the outlet, and the filtration filter is arranged in the flow path, into the liquid containing the filtering object contained in a liquid storage container with one end side of the holder provided with the outlet so as to capture the filtering object with the filtration filter; introducing the liquid from the outlet of the holder of the filtration recovery device; closing the outlet of the holder of the filtration recovery device; and recovering the filtering object together with the liquid held in the holder of the filtration recovery device.