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Industrial wastewater treatment plants comprising of membrane separation tank, wastewater treatment tank, membrane blower, suction pump, and control panel; submerged membrane units for use in the treatment of wastewater; sewage treatment plants; industrial waste water purification plants; bioreactors for use in the treatment of wastewater; waste water treatment tanks; wastewater treatment apparatus and their parts and fittings; wastewater treatment installations and their parts and fittings; wastewater purification installations and their parts and fittings; wastewater purification units and their parts and fittings; septic tanks; membrane filtration units for water treatment apparatus; reverse osmosis membrane filters for water treatment; filters for wastewater; membranes for water filtering apparatus; membranes for the filtration of water; membranes for reverse osmosis units; water purifying apparatus for household purposes; industrial-water purifying apparatus; industrial apparatus for purifying water; water filtration and purification apparatus; water purification apparatus; water filtering apparatus; reverse osmosis water purification units; biological reactors for clarifying industrial effluents; membrane bioreactors for use in the treatment of wastewater; wastewater treatment apparatus for solid-liquid separation of activated sludge; wastewater treatment apparatus for tertiary treatment after sludge sedimentation; sludge thickening apparatus for use in the treatment of wastewater; wastewater treatment apparatus for membrane separation aerobic digestion treatment; wastewater treatment apparatus for digestion sludge concentration; wastewater treatment apparatus for membrane separation chemical coagulation treatment; wastewater treatment apparatus for membrane separation methane fermentation treatment; membrane filtration apparatus for the treatment of wastewater; ceramic membrane filtration apparatus for the treatment of wastewater; wastewater filtration apparatus using polymeric membranes; wastewater filtration apparatus using vinyl chloride membranes; wastewater filtration apparatus using polyethylene membranes; wastewater filtration apparatus using polyvinylidene fluoride membranes; wastewater filtration apparatus using polyether sulfone membranes; wastewater filtration apparatus using polytetrafluoroethylene membranes; filtration apparatus for the treatment of wastewater; filtration membranes for membrane filtration apparatus for the treatment of wastewater; filter units for membrane filtration apparatus for the treatment of wastewater; casings for membrane filtration apparatus for the treatment of wastewater; membrane filtration cartridges for the treatment of wastewater; replaceable membranes for membrane filtration apparatus for the treatment of wastewater; air diffusers for membrane filtration apparatus for the treatment of wastewater; wastewater treatment tanks for household purposes for purification and treatment of household effluent; sewage water purifying apparatus; apparatus for methane fermentative treatment of organic effluent, namely, methane fermentative treatment tanks for use in treatment of liquids including water, industrial effluent and sewage; apparatus for household purposes, for fermentative treatment of organic effluent, namely, methane fermentative treatment tanks for use in treatment of organic materials contained in the household effluent; apparatus for treatment of excreta, namely, bioreactor for use in the treatment of waste; apparatus for treatment of excreta, namely, environmental control apparatus in the nature of particle activators for use in wastewater treatment; waste water purification units in the nature of dust collecting apparatus for use in treatment of waste water; water treatment equipment, namely, filter basins for use in waste water treatment installations; water purification tanks in the nature of nitrification tank equipment for use in waste water treatment installations; deodorizing units utilizing microorganisms in the nature of biological deodorization apparatus for use in waste water treatment installations; activated carbon deodorizing units in the nature of biological deodorization apparatus for use in waste water treatment installations; deodorizing units utilizing chemical action of chemicals in the nature of biological deodorization apparatus for use in waste water treatment installations; soil deodorizing units in the nature of biological deodorization apparatus for use in waste water treatment installations; water purification installations; wastewater and sludge treatment equipment, namely, cartridge filtration units