再生水的生物稳定性研究  

Study on Biostability of Reclaimed Water

作　　者：王怡[1] 范丽龑[1] 张超[1] 柯莉[1] 袁园 彭党聪[1] 夏四清[1,3] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,陕西西安710055 [2]西安市清远中水有限公司,陕西西安710086 [3]同济大学环境科学与工程学院,上海200092

出　　处：《中国给水排水》2014年第21期71-74,共4页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51108368)

摘　　要：以西安市某再生水厂的出水为对象,首先通过静态试验研究了再生水中余氯与异养菌数的消长关系,然后通过测定再生水中碳、磷浓度评价了其生物稳定性,并在此基础上采用生物可利用磷(MAP)阈值法和细菌再生长潜力法探索了碳、磷对再生水中细菌再生长的限制影响。结果表明:即使保持1.35 mg/L的余氯浓度,再生水依然会发生细菌再生长问题,且当停留时间>36h后,异养菌按对数增殖;再生水的可同化有机碳(AOC)、生物可降解溶解性有机碳(BDOC)及MAPmax均值分别为454.61μg/L、1.67 mg/L和13.81μg/L,其生物稳定性较差;在碳、磷浓度均超过生物稳定性限值条件下,该再生水中细菌再生长的限制因子为有机碳。A static test was carried out to investigate the relationship of residual chlorine to in- crease and decrease the number of heterotrophic bacteria in the effluent from a wastewater treatment and reuse plant （WTRP） in Xi＇ an. The concentrations of carbon and phosphorus were measured to evaluate the biostability of the reclaimed water. Based on the above findings, microbial available phosphorus （MAP） threshold and bacterial regrowth potential （BRP） method were adopted to explore the factors lim- iting the regrowth of the bacteria in the reclaimed water. The results showed that the bacteria could still survive and regrow in the reclaimed water even if the residual chlorine concentration was maintained at 1.35 mg/L. Moreover, the heterotrophic bacteria proliferated by logarithmic relationship when the reten- tion time of the reclaimed water was more than 36 h. The average concentrations of assimilable organic carbon （AOC）, biodegradable dissolved organic carbon （BDOC） and MAPmax in the reclaimed water were 454.61 μg/L, 1.67 mg/L and 13.81 μg/L, respectively, indicating a poor biostability of the re- claimed water. The organic carbon was the major factor to restrict the regrowth of the bacteria in the re-claimed water although both carbon and phosphorus exceeded the limit value of water biostability in this experiment.

关 键 词：再生水 生物稳定性 碳 磷 可同化有机碳 

分 类 号：X703[环境科学与工程—环境工程]