侧流磷回收强化主流脱氮除磷微观现象评价  

Evaluation of microcosmic phenomena on enhancing main-stream biological nutrient removal by side-stream phosphate recovery

作　　者：郝晓地[1] 李季[1] 赵梓丞 刘杰 HAO Xiaodi;LI Ji;ZHAO Zicheng;LIU Jie(Sino-Dutch R&D Centre for Future Wastewater Treatment Technologies,Beijing Advanced Innovation Centre of Urban Design,Beijing University of Civil Engineering and Architecture,Beijing 100044,China;Beijing Capital Eco-Environment Protection Group Co.Ltd.,Beijing 100044,China)

机构地区：[1]北京建筑大学城市设计高精尖中心,中-荷未来污水处理技术研发中心,北京100044 [2]北京首创生态环保集团股份有限公司,北京100044

出　　处：《环境工程学报》2021年第11期3677-3685,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51878022)。

摘　　要：在低碳源污水脱氮除磷时外加碳源虽然明显有效,但这会增加运行费用,且增加间接碳排放量。为此,考虑侧流磷回收强化主流脱氮除磷工艺,以解决低碳源进水对脱氮除磷的限制。基于变型UCT工艺,建立侧流磷回收单元,仅以调节pH方式实现磷沉淀。结果表明,实验确定的最佳侧流比为15%,调节侧流上清液pH至9.5~10.5即可实现较高的磷回收效率。此外,分析了侧流磷回收强化主流脱氮除磷作用,并进一步评估污泥性状、微生物活性与丰度等微观变化。通过实验,详细剖析并总结了侧流磷回收强化主流脱氮除磷工艺引起的微观现象,重点对污泥沉淀性能、胞外聚合物(EPS)变化、微生物(硝化细菌、聚磷菌、反硝化除磷菌等)活性与丰度等进行了深入分析与评价。以上研究结果有助于侧流磷回收强化主流脱氮除磷工艺推广应用。External carbon source is effective on improving the efficiency of biological nutrient removal(BNR)with low-concentration influent organic loads,but it must increase operational costs and CO2 emission.Under the circumstance,side-stream phosphate removal(P-removal)on enhancing main-stream BNR should become an alternative to solve the BNR limitation by low-concentration influent carbon source.A modified UCT process with the side-stream P-removal unit was applied for recovering phosphate only by adjusting pH in this study.The experimental results reveal that the optimal side-stream ratio was 15%and pH at 9.5~10.5 for side-stream supernatant could achieve the highest P-recovery efficiency.The experiment results also indicated that the sidestream P-removal could enhance the main-stream BNR,and then associated sludge characteristics,activities of related bacteria as well as the species and abundance of dominant bacteria were experimentally studied and evaluated.With the experiments,microcosmic phenomena on enhancing main-stream biological nutrient removal by side-stream phosphate recovery was analyzed,and the performance of sludge sedimentation,extracellular polymer substances(EPS),the activity and abundance of microbials(including nitrifiers,phosphorus-accumulating organisms(PAOs)and denitrifying phosphorus removing bacteria(DPB))were mainly analyzed and evaluated.The conclusions would be useful for promoting the practical application of the side-stream P-removal on enhancing the main-stream BNR.

关 键 词：侧流磷回收 脱氮除磷 硝化细菌 反硝化除磷 污泥性能 优势菌属 

分 类 号：X703.1[环境科学与工程—环境工程]