厌氧-好氧-缺氧SBBR工艺对垃圾渗滤液深度脱氮处理的试验

Experiment of Advanced Treatment with Anaerobic-Aerobic-Anoxic SBBR Processes for Landfill Leachate Denitrification

传统的垃圾渗滤液生化处理工艺以厌氧-好氧(AO)为主,存在总氮(TN)去除率较低的问题。为提高垃圾渗滤液的TN去除率和去除速率,本研究采用序批式生物膜反应器(SBBR)工艺处理COD_(Cr)质量浓度为7760 mg/L、TN质量浓度为1200 mg/L的实际垃圾渗滤液。该SBBR的运行模式为厌氧-好氧-缺氧运行,在不增加外加碳源的情况下,经过85 d的启动和驯化,出水TN质量浓度低于20 mg/L,TN的去除效率>97%。与序批式反应器(SBR)相比,投加填料提高了同步硝化反硝化(SND)的去除效率,周期从19.5 h缩短到13.75 h。高通量分析表明,SBBR的优势类群为变形菌门(26.43%),而SBR的优势类群为绿弯菌门(28.53%),不同的优势菌群可能是SBBR相比SBR脱氮效率更高的原因之一。

The traditional biochemical treatment process of landfill leachate is mainly AO,which has the problem of low removal rate of total nitrogen(TN).In order to improve the TN removal rate and removal rate of landfill leachate,sequencing batch biofilm reactor(SBBR)was used to treat the actual landfill leachate with COD_(Cr) of 7760 mg/L and TN of 1200 mg/L.The operation mode of the SBBR was anaerobic-aerobic-anoxic operation.After 85 days of start-up and acclimation without adding external carbon source,the effluent TN concentration was lower than 20 mg/L,and the removal efficiency of TN was more than 97%.Compared with sequencing batch reactor(SBR),the removal efficiency of simultaneous nitrification and denitrification(SND)was improved by adding fillers,and the period was shortened from 19.5 h to 13.75 h.High throughput analysis showed that the dominant group of SBBR was Proteobacteria(26.43%),while that of SBR was Chloroflexi(28.53%).The different dominant microbial communities may be one of the reasons why SBBR had higher nitrogen removal efficiency compared to SBR.