新型生物质碳源的制备及其污水脱氮除磷效果

Preparation of a new biomass carbon source and its application in wastewater denitrification and phosphorus removal

为给城镇污水处理厂生物脱氮除磷提供一种新的碳源选择和开辟蓝藻资源化利用新途径,以工业碳源乙酸钠为对照,探究了从蓝藻中提取的高碳低氮磷有机物为核心的新型生物质碳源脱氮除磷效果,并分析了添加2组碳源后的微生物群落特征。结果表明,与乙酸钠碳源相比,新型生物质碳源对COD的去除效果保持稳定,平均去除率高达91.7%;新型生物质在碳源投入反应器初期时,反硝化潜力及释磷潜力较低导致NH_(3)-N、TN、TP和PO_(4)^(3−)-P的去除率较低;随着反应器运行至后期,反硝化潜力和释磷潜力稳步提升,NH_(3)-N、TN、TP和PO_(4)^(3−)-P去除率逐渐上升,最终可达90%以上,对系统中的NH_(3)-N、TP的去除效果良好,且反应器中微生物丰度较高。本研究制备的新型生物质碳源具有生产原料绿色、安全、无毒和环保的特点,其生产方法精简高效,适用于大规模工业化应用,且脱氮除磷效果好,具有非常广泛的应用前景及推广价值。

This study aimed to provide a novel carbon source alternative for improving biological denitrification and phosphorus removal efficiency in urban wastewater treatment plants,while also to explore new approaches for utilizing cyanobacteria resources.Specifically,we examined the denitrification and phosphorus removal performance of a novel biomass carbon source synthesized by combining high-carbon,lownitrogen,and low-phosphorus organic matter extracted from cyanobacteria along with sodium acetate,an industrial carbon source,as a control group.In addition,this study analyzed the microbial community characteristics subsequent to the implementation of both carbon source groups.The results showed that compared to sodium acetate,the novel biomass carbon source effectively removed chemical oxygen demand,with a consistent removal efficiency of 91.7%.However,during the initial phase when the novel biomass carbon source was just added,the denitrification and phosphorus release potentials were relatively low,resulting in moderate removal rates for ammonia nitrogen(NH_(3)-N),total nitrogen(TN),total phosphorus(TP),and phosphate(PO_(4)^(3−)-P).As the reactor run to the later stage,both denitrification and phosphorus release potentials steadily increased,leading to more than 90%removal of NH_(3)-N,TN,TP,and PO_(4)^(3−)-P.Moreover,abundant protozoa and metazoa were observed in the reactor.In conclusion,this novel biomass carbon source prepared in this study were safe,non-toxic,and environmentally friendly.Its production method was simple and efficient.It is suitable for large-scale industrial applications for the good nitrogen and phosphorus removal effects.This novel biomass carbon source has a very broad application prospect and promotion value.