Method and device of processing excess sludge

Abstract

In an activated sludge treatment of organic waste water, excess sludge from the activated sludge aeration vessel is processed with hypochlorous acid in place of ozone without set up of aeration vessels and blowers to improve volume reduction cost of sludge without deterioration of water quality. The hypochlorous acid process is carried out by using an acidulous sodium hypochlorite aqueous solution which is prepared by mixing sodium hypochlorite aqueous solution with a dilute hydrochloric acid and diluting the resulting mixture with water of available chlorine concentration at a pH zone of more than 4 to less than 7.

Description

technical field [0001] The invention relates to a circulating excess sludge treatment system for continuously treating excess sludge, in particular to the process of continuously extracting excess sludge generated in an active aeration tank in the activated sludge treatment of organic drainage and treating it. A recycling type excess sludge treatment method and equipment thereof returned to an activated sludge tank. Background technique [0002] In the activated sludge aeration tank of the activated sludge treatment equipment with organic drainage, a large amount of excess sludge will be produced. Traditionally, after dewatering the generated excess sludge, the dewatered sludge is discarded at a disposal site or incinerated. However, due to problems such as insufficient treatment plants and high treatment costs, it is necessary to develop technologies for reducing the volume of excess sludge. [0003] Recently, a volume reduction system for excess sludge has been proposed,...

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Problems solved by technology

[0009] In addition, since an expensive ozone generator is required to supply ozone, there is also a problem that the processing equipment is expensive

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