| The treatments of aniline wastewater always are physico-chemical method by primarily, but the treatment scale and effect are both not very good. The traditional activated sludge method and its modified methods are both not have a valuable treatment effect. The microorganism need a long term domestication to accommodate the quality of aniline wastewater, and the anti-shock loading capability of them is not very good as well. The culture of special group bacteria for treating aniline is a main research direction in recently years. After mutagenesis, sifting, culture, the special group bacteria can accommodate the aniline wastewater, and it also can get a better treatment effect, but the operating cost is a little bit higher. The sifting and culture of special group bacteria also need a lot of money and time.Because the preferable tolerance of high concentration organic wastewater and the strong anti-shock loading capability of Photosynthetic Bacteria (PSB), the using of PSB in wastewater treatment field is more and more. This paper studied the feasibility of PSB combined activated sludge process to treat aniline wastewater, and studied its optimal process. Restraining the mass propagation of alga by controlling the temperature.Studies showed that:After being treated by PSB, the COD of aniline wastewater could be reduced from 230 4mg/L to 144-166mg/L, and the removing rate of COD was 92.8%.The content of aniline could be reduced from 28.4mg/L to 2.85mg/L. The removing rate of aniline was 90%. After being treated by activated sludge, the COD of effluent which was treated by PSB could be reduced to 84-100mg/L, and the content of aniline could be reduced to 0.71mg/L. The total COD removing rate of the whole process was 96.4%, and the total aniline removing rate of it was 97.5%. The water quality of the treated water could exceed the Nation's First grade level.PSB and the microorganism in domestic sewage could form the multiple microorganisms. It not only could increase the biodegradability, but also could provide abundant nutrition to the activated sludge microorganism, while the PSB could keep its dominance at the same time. Some characteristics of PSB itself made it couldn't keep dominance after multiplying some time, and then the treatment effect would be affected. For resolving that question, adding fresh PSB periodically was necessary, and the expending cultivation of PSB must be executed no more 3 times. In PSB reactor, the time of anaerobic condition could reach 44 hours. That could lengthen the time of anaerobic acidification process disguisedly. It also could deepen the anaerobic acidification of aniline, ensuring the removing rate of both COD and aniline in the followed process.The PSB's tolerant range of temperature was wider than the alga, so the mass propagation of alga could be restrained by controlling the temperature. That could ensure the treatment effect of aniline wastewater by PSB. When the temperature was between 27≤t<29℃and 31 |
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