The Study Of Black-odor Water Treatment By Combination Of Microorganisms

With the rapid economic development and the drastic expansion of the urban population, a large number of domestic sewage and industrial waste water discharge into rivers or lakes without effectively purified. The water body is polluted seriously. Black-odor appears seasonally or even throughout the year. The water quality is declined. The sewage treatment costs is increased. Black-odor problems is imminent at present, so black-odor water body management is significant.Based on the water and sediment from East Lake, South Lake, Shuiguo Lake, Xunsi River, Huangxiao River, Longwang mouth sewage treatment plant and pig farm, Photosynthetic bacteria (PSB) and the microbial strains which were adaptable and efficient degradation of COD were screened, and efficient absorption of ammonia nitrogen algae was combined. The research of natural black-odor water purification was tested by the combination of microorganisms.8Photosynthetic bacterria named YS2, NS1, SS1, SS2, MS1, MW4, XS1respectively were enriched from different polluted sediment and sewage. In the condition of anaerobic with inoculation amount1%for10days, the removal rate of COD, ammonia nitrogen, odor and chroma by YS2, NS1, SS1, SS2, MW4, MS1, XS1were50.09%～65.02%,10.43%～14.19%,79.94%～87.13%,76.41%～86.76%. NS1on artificial black-odor water purification efficiency is the best, and the removal rate of COD, ammonia nitrogen, odor and chroma were54.02%,3.46%,48.94%and50.05%,that higher than control.To further enhance the COD removal efficiency of black-odor water, by starch-iodine staining and black-odor water degradation experiments,39,20and36bacteria cloning degradation of COD were isolated from th NDS、G I S and MDS.The highest efficient degradation microbial cloning of COD was isolated from NDS was B23. The removal rate of COD was44.65%after3days.In order to strengthen the ammonia removal efficiency and supplement dissolved oxygen, The ammonia nitrogen removal of compared tolerance the algae were compared, such as Euglena gracilis, Chlorella pyrenoidose, Hydrodictyaceae reticulatum, Pithophora oedogonia, Oedogonium Link.sp.Except for Euglena gracilis, the removal rate of ammonia nitrogen was27.99%-97.04%for the remaining four kinds of algae species affected by photosynthetic bacteria NS1in16days. Oedogonium Link.sp on degradation rate of ammonia nitrogen is97.04%which is the best among the four types of algae species. Above screening obtained microorganisms of natural black-odor water test show that followed by the combination of bacteria and algae, which is superior to other combination. The removal rate of COD, ammonia nitrogen, odor and chroma respectively was54.4%,11.65%,91.65%,89.6%under anaerobic condition9days later. This combination of microbial treatment to black-odor water is feasible.