Construction Of High Effective Complex Microbial Community Of Aerobic-anaerobic Coupled (aac) Reactor And Its Treating Ability

According to the characters of aerobic-anaerobic coupled reactor (AAC) with effectively treating tomato processing wastewater and achieving sludge reduction, the aerobic and anaerobic strains were isolated from the AAC. The treatment performances to tomato processing wastewater of these strains were investigated by compatibility test. A high effective complex microbial community was constructed by different screening indices. The main results are as follows:1. 29 bacterial strains were isolated from the aerobic field of AAC, 6 bacterial strains were determined as the dominant strains and 4 bacterial strains with good settling property were also determined. The treatment performances to tomato processing wastewater of these strains were investigated by shake flash test.2. An efficient flora including 7 aerobic strains was constructed by compatibility test. It had higher TOC removal rate, lower sludge production and good settling property. The TOC removal rate of this flora was 78.92%, the increment of cell growth/TOC removal rate (CG/TOC) was decreased to 0.94 and then CG/TOC reduced of 50.26% compared with fundamental combination bacteria (T9, T10). The sludge settling property improved obviously and the OD600 decreased to 0.347.3. 10 anaerobic strains were obtained from the anaerobic field of AAC, and the effects of treating tomato paste wastewater, aerobic flora cells, aerobic flora degradation products and mixture of aerobic material of these strains were investigated.The results are as follows: anaerobic strains could treat tomato paste wastewater to some extent. The degradation effect was not as good as aerobic strains.The anaerobic strains could not utilize aerobic flora degradation products effectively under the condition of aerobic flora degradation products only. On the basis of aerobic flora, anaerobic flora was constructed by the role that anaerobic strain can reduce the sludge production effectively.4. It also studied the treatment of this composite flora which was inoculated into AAC reactor. When the hydraulic retention time was 24h, AAC had fast starting speed and biofilm could form well in five days. The COD decreased from 600-1800mg/L to 211.8mg/L of 24h. When the hydraulic retention time was 24h, the the COD of effluent in average was 140.6mg/L at the load increasing period of AAC, The pH and SS maintained in normal and The average SS of effluence was 40.5mg/L, there was no excess sludge to discharge. And it can meet the national comprehensive waste water discharging standardâ…¡.