PN/A工艺应用于主流城市污水处理的研究进展

Development of PN/A process applied to mainstream municipal sewage

厌氧氨氧化工艺是一种经济高效的新型生物脱氮工艺,但受限于城市污水特性和自身缺陷,其在主流城市污水处理的应用过程中面临诸多挑战。总结了部分短程硝化-厌氧氨氧化(PN/A)工艺应用于主流城市污水处理的优势和关键问题,重点介绍了相应改进措施,包括城市污水中高负荷有机物的去除、不利生境下功能菌群间的选择性促进与抑制及出水中硝酸盐浓度的降低。并提出了对传统活性污泥工艺进行升级改造、具有无需外加碳源、脱氮效率高等优势的新型PN/A-ED工艺设想,为城市污水处理厂的提标改造和节能减排提供参考借鉴。

Anammox(Anaerobic ammonia oxidation)process is a cost-effective new biological nitrogen removal process,but limited by the characteristics of municipal wastewater and its own defects,it faces many challenges in the application process of mainstream municipal wastewater treatment.The advantages and key problems of different partial nitrification and Anammox processes(PN/A)applied to mainstream municipal wastewater treatment are summarized,and the corresponding improvement measures are mainly introduced,including removal of high-load COD in municipal wastewater,the selective promotion and inhibition of various functional bacteria in unfavorable living environment and the reduction of nitrate concentration in effluent.The idea of a new PN/A-ED process,which upgrades the traditional activated sludge process and has the advantages of no additional carbon source and high denitrification efficiency,is proposed to provides reference for the upgrading and reconstructing and energy conservation and emission reduction of municipal wastewater treatment plant.