硝化液回流比对ABR-MBR工艺反硝化除磷效能的影响  

Effect of NO_x^--N Recycling Ratio on Denitrifying Phosphorus Removal Efficiency in the ABR-MBR Combined Process

作　　者：吕亮[1,2] 尤雯 张敏 吴鹏[1,2,3] 沈耀良 

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009 [2]江苏省水处理技术与材料协同创新中心,苏州215009 [3]江苏省环境科学与工程重点实验室,苏州215009

出　　处：《环境科学》2018年第3期1309-1315,共7页Environmental Science

基　　金：国家自然科学基金项目(51578353);江苏省自然科学基金项目(BK20160356);江苏省高校自然科学研究项目(16KJB610013);苏州科技大学科研基金青年项目(XKQ201504)

摘　　要：基于ABR工艺与MBR工艺的耦合联动,以低C/N比生活污水为研究对象,构建生物相分离、液相循环和功能联动的ABR-MBR新型组合工艺,以实现稳定、高效、节能的多功能生物除污(去碳-脱氮-除磷)为目标,通过优化水力停留时间(HRT)以获得ABR优质碳源提供与MBR短程硝化实现的最佳组合,并进行了硝化液回流比为100%、200%、300%和400%时对反硝化除磷的影响研究.ABR-MBR耦合工艺在不同条件下的运行研究结果表明,将溶解氧(DO)维持在低浓度(0.3~1.0 mg·L-1)下及HRT维持在较短(HRTMBR=3 h)情况下在MBR中实现了短程硝化,亚硝酸盐积累率达到60%以上;随着硝化液回流比的增大,ABR中反硝化除磷效能先升高后下降,以300%时反硝化除磷效果为最佳,此时亦处于MBR短程硝化阶段,实现了短程反硝化除磷(主要以NO-2作为电子受体的反硝化除磷),且短程反硝化除磷在系统除磷中占据了主导作用.Based on the coupling of the ABR process and the MBR process,a novel combined ABR-MBR process,including biophase separation,liquid circulation,and functional linkage,was developed to achieve simultaneous carbon,nutrient,and phosphorus removal when treating domestic wastewater with low carbon/nitrogen ratio and to obtain the best combination of ABR,providing a quality carbon source,and MBR,achieving shortcut nitrification by optimizing hydraulic retention time（HRT）. The influence of NOx^--N recycling ratio on nitrogen and phosphorus removal was investigated at NOx^--N recycling ratios of 100%,200%,300%,and400%,respectively. The experimental results under different conditions showed that the efficiency of denitrifying phosphorus removal in the ABR was found to increase with increasing NOx^--N recycling ratio from 100% to 300% but decreased when the NOx^--N recycling ratio was 400%. Shortcut nitrification was achieved by controlling the low dissolved oxygen（DO） concentration ranges from 0. 3 to 1. 0 mg·L^-1 with the short HRT of 3 h in the MBR reactor. The nitrite accumulation ratio was above 60%,when the NOx^--N recycling ratio was 300%. Meanwhile,shortcut denitrifying phosphorus removal（where NO-2-N mainly acted as the electron acceptor for denitrifying phosphorus removal） was achieved and played the dominant role in phosphorus removal.

关 键 词：ABR-MBR工艺 短程硝化 反硝化除磷 硝化液回流比 

分 类 号：X703.1[环境科学与工程—环境工程]