Method for synergistically decreasing residential sludge by utilizing ozone preoxidation-membrane bioreactor

Abstract

The invention belongs to the field of sludge treatment and disposal, in particular relates to a process of a sludge decreasing method by effectively combining a chemical oxidation technology and a biotechnology. The process comprises the following steps: (1) in an ozone preoxidation treatment unit: generating strong oxidization by dosing ozone to damage hardly biodegradable cell membranes, and the like, rapidly dissolve matters in the cell in water, oxidize insolvable macromolecular matters to be easily utilized by microorganisms and be favorable to further biodegradation; (2) in a membrane bioreactor unit: synergistically strengthening to remove organic matters released by the crushed sludge by utilizing the self digestion of the sludge and the technologies of biodegradation, membrane filtration, and the like in the membrane bioreactor so as to achieve the sludge decreasing aim and also ensure that the effluent quality accords with the emission standard or the industrial reuse water quality requirement. The process has the advantages of good sludge decreasing effect, no secondary pollution, low energy consumption, direct effluent drainage, and the like.

Description

1. Technical field [0001] The invention relates to a method for ozone preoxidation-membrane bioreactor to cooperate with excess sludge reduction. 2. Background technology [0002] The essence of sewage biochemical treatment is to use colloidal and dissolved organic matter in sewage as a source of nutrition for microorganisms, and convert them into carbon dioxide, water and biological matter, and excess biological matter constitutes excess sludge. Excess sludge is a solid waste, containing a large amount of toxic and harmful substances and unstabilized organic matter. If it is not properly disposed of, it will cause serious pollution to the environment after discharge. At present, the annual discharge of dry sludge from urban sewage treatment plants in my country is about 300,000 tons, with an annual growth rate of about 10%. [0003] Sludge treatment and disposal costs are expensive. In urban sewage treatment plants in my country, the cost of traditional sludge treatment ac...

AI Technical Summary

Problems solved by technology

Excess sludge is a solid waste, containing a large amount of toxic and harmful substances and unstabilized organic matter. If it is not properly disposed of, it will cause serious pollution to the environment after discharge.

Images