回流比对前置BAF系统除氮和除DEHP的影响  

EFFECT OF RECYCLE RATIO ON NITROGEN AND DEHP REMOVAL IN A PRE-DENITRIFICATION BAF PROCESS

作　　者：哀妮媛[1] 孟雪征[1] 曹相生[1] 

机构地区：[1]北京工业大学建工学院,水质科学与水环境恢复工程北京市重点实验室,北京100124

出　　处：《水处理技术》2013年第9期76-79,共4页Technology of Water Treatment

基　　金：国家自然基金(51178006,50808002);北京市科技新星(2008B11)

摘　　要：前置反硝化生物活性滤池(BAF)工艺是目前污水脱氮的常用工艺,但该工艺去除邻苯二甲酸二(2-乙基己基)酯(DEHP)的研究未见报道。为此,利用实验室小试装置,对前置反硝化BAF工艺去除DEHP的性能进行了评价并重点研究了硝酸盐回流比的影响。结果表明,系统进水DEHP为100μg/L左右时,该工艺的DEHP平均去除率在55%左右。其中,前置反硝化BAF的DEHP平均去除率在30%左右,硝化BAF的DEHP平均去除率在20%左右。兼氧条件更有利于DEHP的去除。硝酸盐回流比从100%改变为300%后,整个工艺对DEHP的去除率变化不大,但总氮的去除率变化较大。这说明DEHP降解菌和硝化、反硝化细菌对环境的要求不同,生态位也可能不同。综合考虑DEHP和总氮的去除,该套系统的最佳体积回流比为200%。The pre-denitrification biological aerated filter process （PRBAF） is poiaular used for nitrogen removal from wastewater, but its removal characteristics of di-（2-ethylhexyl） phthalate （DEHP） are poorly understood. In this study, a bench-scale PRBAF was established and the effect of recycle ratio on the performance of DEHP removal was evaluated. Data showed that, when the influent DEHP concentration kept at 100 Ixg/L around, DEHP removal efficiency of the process reached 55%. The DEHP removal efficiency of the denitrification biological active filter was 30%. These data implied that the facultative anaerobic conditions favorite DEHP biodegradation. During the period that the nitrate recycle ratio was changed from 100% to 300%, no significant varies were observed for DEHP removal, while the total nitrogen removal efficiency changed drastically. This was contributed by the essential differences between DEHP-degrading bacteria and nitrogen removal bacteria. Considered DEHP and nitrogen removal, the best nitrate recycle ratio of the PRBAF process was determinated as 200%.

关 键 词：脱氮 环境激素 邻苯二甲酸酯 污水 

分 类 号：X703.1[环境科学与工程—环境工程]