Research And Engineering Practice On Photosensitize Wastewater Treatment With Hydrolyze Acidification--PACT/SBR Technology

Photosensitize wastewater are difficult to be treated because its produce is a complex chemical process, and up to now, tentative research and engineering application on effective treatment have not found. A treatment site is built by some chemical plant to try to treat photosensitize wastewater, but it has not been startup and run successfully by far. In the context, the author is commissioned by the plant to tentatively study biological treatment feasibility of collected photosensitize wastewater and to employ engineering practice on the basis of the results of laboratory research. Significant research results are gained as follows:(1) The macro-treatment mode of "diffluent + dispersed + integrated " are proposed by the wastewater component analysis. The practice shows that the organic matter (COD) content of compositive wastewater can be reduced from about 15000 mg/L to 4000~6000 mg/L by diffluent treating saline wastewater of high contaminant concentration and dispersed treating sulfur-included wastewater, in the result the possibility of finally releasing up to par is improved.(2) The results of tentative experiments and engineering practice show that treating non-biodegradable photosensitize wastewater with hydrolyze acidification-PACT / SBR technology is feasible. If the system run normally, it can be ensured that the effluent COD reach less 150mg/L when the inflow COD is hi the range of 800~3000mg/L and so can meet the basic needs of Integrated wastewater discharge standard GB 8978-1996.(3) The two relatively unattached hydrolyze pond can improve antitoxic ability of the hydrolyze microorganism and strengthen hydrolyze acidification effect. The chromatogram analysis shows that the kind of polar matter in the wastewater is increased, the non-polar matter is reduced and the ratio of BOD5/COD are improved from 0.15 to 0.33 when the wastewater are treated by the two hydrolyze pond.Engineering practice shows that better results can be gained with low investment when new technology and methods are pertinently integrated into traditional wastewater treatment system to reconstruct existing wastewater treatment plant according to water quality characteristic. In this paper, the change of COD in each stage and the sludge characteristic in the system during the debugging process are provided and analyzed in details; the existing problems in the engineering debugging are summed and analyzed,then correlative ideas and advices are given. These results are very significant to guide photosensitize wastewater treatment and engineering practice.