摘要
为解决传统活性污泥法处理市政污水效率较低的问题,借助复合絮凝剂加速污泥沉降的特性,考察了常规运行模式(M1,阶段Ⅰ)、原水与部分出水混合进水的运行模式(M2,阶段Ⅱ~Ⅳ)、缺氧回流型运行模式(M3,阶段Ⅴ)对SBR反应器脱氮除磷的影响.实验结果表明,M2模式的阶段Ⅲ(水力停留时间(HRT)为16 h)~阶段Ⅳ(HRT为8 h,复合絮凝剂投加量均为20μL·L^-1),控制组与实验组的TP去除负荷分别从8.0、12.3 g·m^-3·d^-1上升到21.9、26.4 g·m^-3·d^-1,表明高水力负荷有利于聚磷菌发挥作用,投加复合絮凝剂进一步提升了磷的去除能力.在3种模式中,M3模式处理效率最高,实验组沉淀时间为5 min,其出水COD、NH4^+-N、TN、TP的平均浓度分别为21.6、0.28、15.7、0.18 mg·L^-1,相应平均去除率分别为93%、99%、67%、98%,除TN外,均可达到《城镇污水处理厂污染物排放标准》(GB 18918-2002)一级A标准.
In order to solve the problem of low efficiency of traditional activated sludge process in municipal wastewater treatment, the effects of conventional operation mode(M1, stage Ⅰ), mixed feed mode(M2, stage Ⅱ~Ⅳ) and anoxic reflux mode(M3, stage Ⅴ) on nitrogen and phosphorus removal in SBR reactor were investigated by means of the characteristics of rapid sludge sedimentation caused by composite flocculants. The experimental results show that in M2 mode, from stage Ⅲ(HRT of 16 h) to stage Ⅳ(HRT of 8 h) with the dosage of composite flocculants of 20 μL·L^-1, the TP removal load of control group and experimental group increases from 8.0, 12.3 g·m-3·d^-1 to 21.9, 26.4 g·m^-3·d^-1, respectively. It showed that high hydraulic load was beneficial to the function of phosphorus accumulating organisms, and the addition of composite flocculants could further improve the removal capacity of phosphorus. The treatment efficiency under the mode M3 with the settling time of 5 minutes was the highest among the 3 operation modes. The average concentration of COD, NH4^+-N, TN and TP in effluent was 21.6, 0.28, 15.7 and 0.18 mg·L^-1, respectively. The corresponding average removal rates were 93%, 99%, 67% and 98%. Except TN, the effluent of experimental group under the mode M3 could meet the first-class A standard of "Pollutant Discharge Standard of Urban Sewage Treatment Plant"(GB 18918-2002).
作者
王启镔
宫徽
朱越
何文妍
史彦伟
王凯军
WANG Qibin;GONG Hui;ZHU Yue;HE Wenyan;SHI Yanwei;WANG Kaijun(State Key Joint Laboratory of Environmental Simulation and Pollution Control,School of Environment,Tsinghua University,Beijing 100084;Beijing Enterprises Water Group(China)Investment Limited,Beijing 100102)
出处
《环境科学学报》
CAS
CSCD
北大核心
2020年第4期1167-1173,共7页
Acta Scientiae Circumstantiae
基金
国家水体污染控制与治理科技重大专项(No.2017ZX07103-001)。
关键词
SBR
市政污水
运行模式
复合絮凝剂
脱氮除磷
sequencing batch reactor(SBR)
municipal sewage
operation mode
composite flocculants
nitrogen and phosphorus removal
