Patent ID: 7922915
Filing Date: 2011-04-12
Classification: B01D,B24B,C02F

Abstract:
1. A wastewater treatment system which subjects silicon processing wastewater containing silicon processing waste to a filter treatment, comprising: acid fluid injection means for injecting an acid fluid into the silicon processing wastewater to obtain raw wastewater to be treated having a pH of 4.0 to 6.5; wastewater storage means for receiving the raw wastewater; filter means for filtering the raw wastewater to separate the wastewater into concentrated water having an increased content ratio of the silicon processing waste and filtered water; liquid forwarding means for forwarding the raw wastewater from the wastewater storage means to the filter means; and circulation/forwarding control means for continuously or intermittently regulating the pH of the raw wastewater to 4.0 to 6.5 and forwarding the wastewater to the filter means, wherein the circulation/forwarding control system continuously or intermittently circulates at least one of the separated concentrated water and the treated water to the wastewater storage tank when the amount of raw wastewater in the wastewater storage tank falls below a predetermined reference amount, and wherein the circulation/forwarding control system continuously or intermittently circulates the separated concentrated water to the wastewater storage tank when the amount of separated concentrated water in at least one of the wastewater storage tank and the filter membrane is above a predetermined reference amount, and circulates the treated water to the wastewater storage tank when the amount of the treated water in the filtered water tank is above a predetermined reference amount.