摘要
采用交替厌氧/好氧(An/O)模式下运行的SBR,考察不同溶解氧(DO)浓度(1.0、0.5、0.1 mg·L^-1)对同步侧流磷回收的强化生物除磷(enhanced biological phosphorus removal,EBPR)主流系统除磷及侧流磷回收性能的影响。结果表明,整个实验阶段主流系统对COD、NH4^+-N及TN的去除均能稳定达到《城镇污水处理厂污染物综合排放标准》一级A标准,其中TN因出水NO3^--N浓度的降低而降低,故TN去除率升高。DO为1.0 mg·L^-1和0.5 mg·L^-1时对磷的去除率分别为99.0%和95.4%,主流系统出水磷达标率分别为96.0%和84.0%。而当DO浓度过低(0.1 mg·L^-1)时,硝化与吸磷对有限电子受体的竞争及吸磷时间不足导致反应结束时系统内平均磷残留量达1.02 mg·L^-1,除磷率降至87.2%。鉴于侧流磷回收是对主流系统的磷剥夺,会影响污泥的好氧吸磷能力,继而厌氧阶段释磷量因侧流提取降低。与此同时,DO为1.0 mg·L^-1时,侧流磷回收率较其余2个工况高,且此工况下主流系统的厌氧释磷及好氧吸磷能力均最高,考虑到主流工艺的可靠运行及出水稳定性,认为DO=1.0 mg·L^-1为最优工况。
An alternate anaerobic/aerobic(An/O)sequencing batch reactor(SBR)was employed to investigate the effect of DO concentrations(1.0,0.5 and 0.1 mg·L^-1)on the main-stream phosphorus removal and sidestream phosphorus recovery performance of the synchronous side-stream phosphorus recovery-enhanced biological phosphorus removal(EBPR)mode.The results showed that the COD,N H4^+-N and TN in the effluent of mainstream system during the whole experimental period could stably meet level A standard of the national discharge of pollutants for municipal wastewater treatment plants,of which the decrease of TN was ascribed to the decrease of N O3^--N concentration in effluent,so TN removal rate increased.The removal rates of phosphorus were 99.0%and 95.4% at DO concentration of 1.0 mg·L^-1 and 0.5 mg·L^-1,respectively,and the corresponding rates of phosphorus reaching standard for the mainstream system effluent were 96.0% and 84.0%,respectively.However,at too low DO concentration(0.1 mg·L^-1),the competition between nitrification and phosphorus uptake for the limited electron acceptor and the lack of phosphorus uptake time led to a mean phosphorus residue of 1.02 mg·L^-1 in the system at the end of the reaction,and the phosphorus removal rate dropped to87.2%.Since the side-stream phosphorus recovery could deprive of phosphorus from the mainstream system,which could affect the aerobic phosphorus uptake capacity of the sludge,the amount of phosphorus release in the subsequent anaerobic phase was reduced due to side-stream extraction.Moreover,the side-stream phosphorus recovery rate at DO=1.0 mg·L^-1 was higher than that of the other two operation conditions,both the anaerobic phosphorus release and aerobic phosphorus uptake capacity of the main stream system reached the highest under this condition.Considering the reliable operation of the mainstream process and the stability of the effluent,DO=1.0 mg·L^-1 was regarded as the optimal operation condition.
作者
杨蕊春
俞小军
赵元添
杨娅
龙岗
陈永志
马娟
YANG Ruichun;YU Xiaojun;ZHAO Yuantian;YANG Ya;LONG Gang;CHEN Yongzhi;MA Juan(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Yunnan Shicheng Environmental Technology Co.Ltd.,Kunming 650034,China;Sewage Treatment Industry Technical Center of Gansu Province,Lanzhou 730070,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第2期387-394,共8页
Chinese Journal of Environmental Engineering
基金
国家自然科学基金资助项目(51668033)
甘肃省大学生创新创业训练计划项目(2017107320836)。
关键词
强化生物除磷(EBPR)系统
低溶解氧
侧流比
磷回收性能
厌氧
enhanced biological phosphorus removal (EBPR) system
low dissolved oxygen
side-stream ratio
phosphorus recovery performance
anaerobic
