| Recently, sewage treatment plant has being faced with transformation for the poor effluent water quality. Therefore,the tradional wastewater treatment technology faced challenge.However, membrane bioreactors which take the advantage of high water quality and covering the area small are becoming one of the main sewage treatment plant transform technology, what is more, anaerobic membrane bioreactor is taking the concept of low energy consumption and sustainable which has become the research focus in the field of wastewater treatment.But the research on the performance of the low temperature anaerobic membrane bioreactor was not much. Besides, membrane fouling problems had limited the engineering application of anaerobic membrane bioreactor. Therefore, this study used jacket as membrane filtration material, replaced the suspended sludge with granular sludge, then developed a new type of anaerobic membrane bioreactor, the AnMBR was under the low temperature(15 ?) running continuously, and we focused on the performance of anaerobic membrane bioreactor and membrane fouling, explored the role of membrane surface biofilm and the characteristic of the microbial community structure. The objection of this study was figuring out the problem of membrane fouling, and we hoped that the study could provide theoretical foundation and technical supportion for engineering application of AnMBR. So we obtained four main conclusions:(1) anaerobic membrane bioreactor in temperature of 15 ?, hydraulic retention time of 3 h under the condition of low concentration acid wastewater treatment, the average COD removal rate was 90%, influent concentration of COD was 395.95 mg/L,and effluent concentration of COD was 39.35 mg/L. The running stability of volatile acid removal rate was about 100%.Volatile fatty acid was composed of acetic, propionic acid and butyrate whose percentage was 2:1:1,and the acetic concentration was 209.94 mgCOD/L.The effluent concentration of acetic was 4.67 mgCOD/L,and propionic acid and butyrate of effluent VFA were not detected.(2) using jacket as membrane filtration material, replace the suspended sludg e anaerobic with granular sludge membrane bioreactor, under the condition of lo w temperature(15 ?) of low concentration acid wastewater treatment running 89 d, and runtime without aeration membrane pollution control measures, such as membrane fouling cycle 40 ~ 50 d, the TMP growth rate is 0.47~0.59 kPa/d,the TMP growth rate is relative to the filtration material.Comprising to the An M BR with hollow fiber,the result showed that the pollution of AnMBR with jacket module is slower than AnMBR with hollow fiber.At last,we observed the memb rane module and found that there are many pollution matters on the membrane a nd clogging the membrane pore size.And what is more,the cake layer could retai n particulate matters,colloid and organic matter.(3) the activity of anaerobic granular sludge was 0.39 gCODCH4/(gVSS·d),an d the microorganism on membrane was 0.21 gCODCH4/(gVSS·d).The result showe d that microorganism on membrane could degrade acetic,but the activity was low er than anaerobic granular sludge.Through the haetmap diagram,we found that M ethanosaeta(79.72~91.55) and Methanobacterium(7.37~19.69) were the main arc haea,the percentage is more than 99%.Addition,the Methanosaeta abundance was lager than Methanobacterium,and it indicated that the degration of acetic was th e main pathway which was producing methane.(4) this article analysed the effection of temperature on microbial community.and the result showed that the microbial community was similar,but the abundanc e was different.Comparing to the room temperature, there were nine bacterial gen nus which microbial abundance dropped,such as vadinHA17_norank?Proteiniphilu m?Chloroflexi_unclassified?Bacteria_unclassified?Georgenia?Christensenellaceae_uncultured?Pseudomonas?Intestinimonas?Anaerolinea and so on. |
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