PROCESS FOR REDUCTION OF WATER POLLUTIONS LIKE ARSENIC, IRON, MANGANESE AND ORGANICS

摘要

A process for reducing arsenic, iron, manganese and organic material content of contaminated water, involves pre-treating the contaminated water with chemicals; and applying a two-stage separation to the pre-treated water, where the first stage is a pre-separation in liquid space and the second stage is a membrane separation that provides surface separation. The process provides concentrated discharge of waste materials. A process for reducing arsenic, iron, manganese and organic material content of contaminated water, involves pre-treating the contaminated water with chemicals; and applying a two-stage separation to the pre-treated water, where the first stage is a pre-separation in liquid space and the second stage is a membrane separation that provides surface separation. An apparatus for reducing arsenic, iron, manganese and organic material content of contaminated water, comprises a chemical mixing unit; a pre-separating unit; a mud collecting and thickening unit; and a membrane filtering unit for sparing ultra-filtering or micro-filtering. The membrane filtering unit contains a membrane reactor and a submerged membrane unit mounted in the membrane reactor. The submerged membrane unit has an input connected to a first output of the pre-separating unit; and an output connected to an input of the chemical mixing unit through a water flow that needs to be cleaned, or to an input of the mud collecting and thickening unit. The mud collecting and thickening unit has a first output connected to the input of the chemical mixing unit through the water flow to be cleaned. The output from the submerged membrane unit is an output of cleared water of the apparatus. The process provides concentrated discharge of waste materials. In the process, the waste material produced during the pre-separation stage is led from a second output of the pre-separating unit to the mud collecting and thickening unit, while the pre-separated liquid is led from the first output of the pre-separating unit to the membrane reactor of the membrane filtering unit filled with liquid, where a sparing membrane separation is performed in the submerged membrane unit. The thickened product from an output of the membrane reactor, and the water from an output of the mud collecting and thickening unit, are led back to a water flow which is to be cleaned. The concentrated waste product containing arsenic is led away from the output, and the cleared water filtered by the membrane is obtained from the output of the submerged membrane unit.