错流式动态膜-生物反应器中污泥活性的研究

应用错流式动态膜-生物反应器(CDMBR)对己内酰胺废水进行了180 d的实验,实验过程中测定反应器的膜出水和上清液的水质,并对污泥进行了耗氧呼吸速率测定.结果表明,上清液COD一直保持在100mg/L以下,而膜出水的则保持在50 mg/L以下,膜对上清液的COD去除率达50%,而对氮的去除没有贡献.可溶性细胞产物(SMP)在反应器内容易积累,停留足够的时间后能被生物降解.通过投加抑制剂测定耗氧呼吸速率,发现异养菌、硝化细菌和亚硝化细菌的活性由于F/M的降低和SMP积累受到一定的抑制,但不影响系统的处理效率.跨膜压力、膜面流速越大,通量衰减得也就越快.

Study on sludge activity in cross-flow dynamic membrane bioreactor

The qualities of filter liguor and supernatant were characterized in this study on crossflow membrane bioreactor(CMBR) throughout a 180 days period.The results showed that the COD concentration of supernatant kept below 100 mg/L while that of filter liguor below 100 mg/L.The efficiency of COD removal by the membrane was up to 50%.But there was almost no contribution to nitrogen removal.Soluble microbial products(SMP) were found to be accumulated in the reactor and degradable after being rejected long enough.The oxygen uptake rate which was measured by using inhibitors illustrated that the activity of the heterotrophic organisms,including Nitrosomonas group,Nitrobacter group and Nitrobacter group,were inhibited because of the decrease of F/M and the accumulation of SMP.But it did not influence the COD removal efficiency.