投加介体对污水低温生物反硝化除磷的影响及磷形态变化  

Effect of redox mediator on sewage biological denitrifying phosphorus removal at low temperature and the change of phosphorus forms

作　　者：苑宏英 王宏斌[1,2] 李原玲 王雪 赵鑫 YUAN Hongying;WANG Hongbin;LI Yuanling;WANG Xue;ZHAO Xin(School of Environmental and Municipal Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Aquatic Science and Technology,Tianjin 300384,China;Joint Research Centre for Protective Infrastructure Technology and Environmental Green Bioprocess,Tianjin 300384,China)

机构地区：[1]天津城建大学环境与市政工程学院,天津300384 [2]天津市水质科学与技术重点实验室,天津300384 [3]基础设施防护和环境绿色生物科技国际联合研究中心,天津300384

出　　处：《环境工程学报》2021年第2期522-529,共8页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51308374);国家水体污染控制与治理科技重大专项(2017ZX07107-002);天津市水质科学与技术重点实验室开放研究基金资助项目(TJKLAST-PT-2016-06)。

摘　　要：污水生物反硝化除磷可以克服传统生物脱氮除磷工艺碳源不足的缺点,利用硝酸盐代替氧气作为电子受体,同时进行脱氮除磷和有机物去除,实现“一碳两用”,但是低温会降低反硝化除磷效率。在低温(10±1)℃条件下,利用序批式反应器(SBR)(90 min厌氧,330 min缺氧,1^(#)(空白对照)和2^(#)(投加介体)),投加氧化还原介体1,2-萘醌-4-磺酸盐(NQS),研究了反硝化除磷效率的变化。结果表明:相较于空白对照实验,投加介体NQS强化了污水低温生物反硝化除磷效果,总氮去除率从37.67%提高至51.47%,提高了1.37倍;总磷去除率从53.45%提高至96.50%,提高了1.81倍。此外,研究还发现介体NQS的投加促进了水中磷酸盐形成有机磷(Org-P)的过程,污泥中磷的主要形态是可溶性磷(SRP)和Org-P,最大含量分别为35.78 mg∙L^(−1)和51.09 mg∙L^(−1);空白对照反应器污泥中磷的主要形态是SRP和Fe-P,最大含量分别为45.61 mg∙L^(−1)和40.67 mg∙L^(−1)。以上研究结果可为低温条件下提高污水生物反硝化除磷效果提供参考。The sewage biological denitrifying phosphorus removal technology can overcome the deficiency of carbon source in the traditional biological nitrogen and phosphorus removal process.It use nitrate as an electron acceptor instead of oxygen.Nitrogen,phosphorus and organic matter removal occurs at the same time to achieve“one-carbon dual-use”.But denitrifying phosphorus removal efficiency will decrease at low temperature.In this study,the change of denitrifying phosphorus removal efficiency was investigated by adding the redox mediator 1,2-naphthoquinone-4-sulfonic(NQS)in sequential batch reactors(SBRs)(90 min anaerobic,330 min anoxic,1^(#)(the control),2^(#)(adding the redox mediator))at low temperature(10±1)℃.The results showed that the addition of NQS increased the sewage biological denitrifying phosphorus removal at low temperature compared with the control experiment.The total nitrogen removal rate increased from 37.67%to 51.47%,which increased by 1.37 times,and the total phosphorus removal rate increased from 53.45%to 96.50%,which increased by 1.81 times.In addition,the NQS promoted the transformation of phosphates to organic phosphorus(Org-P)in sewage,the main forms of phosphorus in the sludge were dissolved reactive phosphate(SRP)and Org-P,with the maximum contents of 35.78 mg∙L^(−1)and 51.09 mg∙L^(−1),respectively.In the control reactor,the main forms of phosphorus in the sludge were SRP and Fe-P,with the maximum contents of 45.61 mg∙L^(−1)and 40.67 mg∙L^(−1),respectively.This study provides theoretical support for improving the effect of biological denitrification phosphorus removal in wastewater at low temperature.

关 键 词：介体 反硝化除磷 可溶性磷 有机磷 

分 类 号：X703.5[环境科学与工程—环境工程]