Study On Augmentation Treatment Of Domestic Sewage By Bioflocculant-producing Microbes

Bioaugmentation technology is the methods of adding a specific function microbial or nutrients or similar substrate structure substances into biological treatment system to enhance microbial activity or induce microbial to produce the corresponding enzyme system, thereby improving the effectiveness of the system treatment. Bioaugmentation technology used in sewage biological treatment processes can improve sewage treatment effectiveness,improve the performance of sludge and reduce sludge. Currently, the technical research mainly concentrated on screening and synthesizing the effectiveness microbial inoculums with degradation acting against quality of sewage and increase systems biomass andstrengthen the disposal of specific pollutants, thereby improving system performance. Therefore, screening effective bacteria and synthesizing the effectiveness microbial inoculums achieve an efficient sewage treatment, low-cost access to renewable water, improvement of sludge performance is the significance of this issue.A9 and C3 were Preservation bioflocculant-producing microbes of Laboratory for Environmental Engineering Institut in northestern university. Aimming at the bioflocculant-producing microbes (A9 and C3)and mixture of them, the subject made a lot of research work.The first stage. First, the domestication of single bioflocculant-producing microbes and mixture of them in use of synthetic domestic sewage as culture medium was studied by this experiment. Because of the synthetic domestic sewage components were relatively fixed, easier explorating the regulation, therefore, we used synthetic domestic sewage to study. The results showed that both single bioflocculant-producing microbes can use the material of synthetic domestic sewage as nutrients and secret microbes flocculant. The kaolin suspension flocculation rate of MBFC3 was 85.2%, while the kaolin suspension flocculation rate of MBFA9 was 93.4%. With synthetic domestic sewage nutrients to be used,The COD of synthetic domestic sewage decreased significantly. Secondly, the effect of single bioflocculant-producing microbes and mixture of them augmentatation treatment of synthetic domestic sewage were studied, using removal rate of chemical oxygen demand,sludge index and flocculability of activated sludge setting as index. The results showed that single bioflocculant-producing microbes and mixture of them adding into activated sludge can strengthen the treatment effect. Compared to the use of activated sludge only, which can improve synthetic domestic sewage removal of COD, enhanced the activated sludge of flocculation and sedimentation. In the process of this experiment, we studied the proportion of the two single bioflocculant-producing microbes and the amount of mixture effect.The second stage. the mixture of two single bioflocculant-producing microbes adding into the Shenyang Northern sewage treatment plant sludge and Shenyang shenshuiwan sewage treatment plant sludge augmentation treatment campus sewage were studied by this experiment. the domestication of sludge and different reaction time, different dissolved oxygen values, the amount of mixture of two single bioflocculant-producing microbes treatment effects was studied. The results showed that mixture of two single bioflocculant-producing microbes was able to use the pollutants in the sewage as nutrients to degrade, increased the COD removal 2%～10%, While enhanced the activated sludge of flocculation and sedimentation. Through the results of the condisition experiment came to the conclusion that the best reaction time was about eight hours, the best dissolved oxygen concentration was 3.5～4mg/L, the best amount of mixture of two single bioflocculant-producing microbes and sewage proportion was 1/250～1/200. Under the best conditions, the COD removal may eventually increase 2%～10% reach about 85%, sludge index could from around 80 reach around 50, the flocculability of activated sludge could from about 50%reach about 68%.