模拟再生水配水管网生物稳定性的研究
Study of biostability in a model reclaimed water distribution system
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摘要: 以T市J再生水厂出厂水为研究对象，利用生物膜反应器模拟再生水配水管网系统。通过微生物的培养和加氯消毒发现，培养40 d后出水和生物膜异养菌达到平衡，出水达5.63 log（CFU/mL），膜片达5.13 log（CFU/cm2）。加氯消毒后出水和膜片上异养菌随着出水自由氯和总氯的增加而降低，通过比较可知控制出水自由氯0.2 mg/L、总氯0c5 mg/L可以有效控制再生水配水管网中异养微生物的再生长繁殖现象，同时可使总大肠菌群处于水质标准值以下。TEM分析表明，在聚碳酸酯片表面生物膜中细菌主要以杆状细菌为主。Abstract: The outlet of one reclaimed water plant was taken as example to the research. The biofilm annular reactor(BAR) was used to simulate the reclaimed water distribution system. HPC on the polycarbonate coupons reached stability after accumulating for 40 days. The number of suspended and attached bacteria was 5.63 log(CFU/mL)， 5.13 log(CFU/cm2)， respectively. The concentration of HPCs decreased with the addition of chlorine. Maintaining the residual free chlorine at the level of 0.2 mg/L， the residual total chlorine at 0.5 mg/L could control the regrowth of biofilm. At this level， the attached bacteria could maintain 3 log and any total coliform group was not found in the effluent and biofilm. The results of TEM indicated that most of the microorganisms were bacillus.
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Key words:
- reclaimed water /
- disinfection /
- biostability /
- biofilm
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