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作 者:张智[1,2] 李柏林[1,2] 相欣奕[3] 张驰[1,2] 刘少武
机构地区:[1]重庆大学城市建设与环境工程学院,重庆400045 [2]三峡库区生态环境教育部重点实验室,重庆400045 [3]西南大学地理科学学院,重庆400715 [4]重庆水务集团股份有限公司,重庆400015
出 处:《环境工程学报》2012年第8期2565-2570,共6页Chinese Journal of Environmental Engineering
基 金:国家水体污染控制与治理科技重大专项(2009ZX07315-002-01);重庆大学研究生科技创新基金项目(CDJXS11210001)
摘 要:针对低温低碳源条件下城市污水的生物脱氮效果不佳的问题,采用A/A/O氧化沟中试装置在实际污水厂开展了冬季低温低碳源条件下不同运行工况的优化研究。通过实验,从3种工况中确定了最优的运行工况,即共采用5个转盘,其中前3个低速运行,第4个高速运行,第5个关闭。在最优运行工况下,系统对COD、NH4+-N、TN平均去除率分别为86.5%、75.4%和70.1%,出水COD、NH 4+-N、TN平均浓度分别为21.0、6.1和14.9 mg/L,出水水质全部优于国家《城镇污水处理厂污染物排放标准》(GB18918-2002)中的一级B标准,出水COD、NH4+-N、TN达到一级A标准的比例分别为100%、20%和40%。Aiming to improve the efficiency of nitrogen removal from low temperature and low carbon mu- nicipal sewage, a pilot scale experimental study with A/A/O oxidation ditch process was carried out in Jingkou Waste Water Treatment Plant of Chongqing in winter. Based on experiments, the best operation mode was deter- mined from the tested 3 modes, in which, there were 5 aeration wheels in total, with the first 3 in low-speed op- eration, the 4th in high-speed operation and the 5th shut-down. The best results obtained were as follows: average removal rates of COD, NH^-N and TN were 86.5% , 75.4% and 70.1% respectively and their concentrations in the effluent were 21.0, 6.1 and 14.9 mg/L, respectively, which could meet the first level B class criteria specified in the Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002). Considering the first level A class criteria, compliance rates of COD, NH4-N and TN in the effluent were 100%, 20% and40%, respectively.
关 键 词:A/A/O氧化沟 低温 低碳源 运行工况优化 脱氮
分 类 号:X703.1[环境科学与工程—环境工程]
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