Technology for treating scouring sewage and sludge

Abstract

The invention designs a technology for treating scouring sewage and sludge. According to the technology, the sewage is treated in an air-floating pond, an anaerobic pond, an aerobic pond and a settling pond, wherein compound iron and organic cation polymeric flocculant are added when the sewage is treated in the air-floating pond; after the treatment is finished, alkali liquor is added into the sewage till pH value reaches 7.5; and then the sewage is treated in the anaerobic pond; and meanwhile, a DO (Dissolved Oxygen) value in the aerobic pond is controlled at 3.5. The technology has the characteristics that the physical action of air floating and the chemical action of the compound iron and the organic cation polymeric flocculant are utilized to recover wool grease, treat the flocculation sludge and reduce the COD (Chemical Oxygen Demand) value of the sewage at the same time.

Description

technical field [0001] The invention relates to a sewage sludge treatment process, in particular to a wool scouring sewage sludge treatment process used in a wool scouring factory. Background technique [0002] The recovery of lanolin in the wool scouring factory is the main profit point of wool scouring, and lanolin is generally rich in the sewage sludge obtained from wool scouring. The existing technology is to remove the oil by acid analysis. Acid analysis is It is necessary to use a large amount of ferrous sulfate to lower the pH value of the sewage in order to precipitate more lanolin, but since the acidic environment is not conducive to the use of microorganisms in the post-treatment of sewage, it is necessary to add a large amount of lye to neutralize the solution after the acid precipitation is completed Ph value, ferrous sulfate and ferric hydroxide and other compounds produced by liquid caustic soda need to be floated again, which increases the treatment cost and m...

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Problems solved by technology

[0002] The recovery of lanolin in the wool scouring factory is the main profit point of wool scouring, and lanolin is generally rich in the sewage sludge obtained from wool scouring. The existing technology is to remove the oil by acid analysis. Acid analysis is It is necessary to use a large amount of ferrous sulfate to lower the pH value of the sewage in order to precipitate more lanolin, but since the acidic environment is not conducive to the use of microorganisms in the post-treatment of sewage, it is necessary to add a large amount of lye to neutralize the solution after the acid precipitation is completed Ph value, ferrous sulfate and ferric hydroxide and other compounds produced by liquid caustic soda need to be floated again, which increases the cost of treatment and makes the cost of treatment remain high

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