城镇污水处理厂进水污染物负荷变化规律系统性分析  

Systematically analyzing variation of influent pollutant load for municipal wastewater treatment plant

作　　者：时玉龙 鲍海鹏[1] 李伟[1] 张荣兵[1] 白煜[1] 李莹莹 陈行行 李杰 SHI Yulong;BAO Haipeng;LI Wei;ZHANG Rongbing;BAI Yu;LI Yingying;CHEN Hanghang;LI Jie(Beijing Drainage Group Co.,Ltd.,Beijing 100044,China)

机构地区：[1]北京城市排水集团有限责任公司,北京100044

出　　处：《给水排水》2022年第10期64-71,共8页Water & Wastewater Engineering

基　　金：国家重点研发计划项目(2018YFC0406300)。

摘　　要：对QH2再生水厂旱季(汛前4月、汛后11月)与雨季(主汛期7月)进水污染物负荷变化规律进行监测分析。结果表明:QH2进水污染物负荷受源头用水特性、管网运维状态,以及水厂抽升策略的综合影响。旱季QH2栅前液位与居民用水量均呈双峰分布,且峰值间隔时长接近。管网对上游来水的生物缓冲、稀释缓冲、容积缓冲效应,随旱季低液位抽升与汛期大水量冲刷而发生变化。旱季进水耗氧污染物负荷(OCPL)略高,汛前、汛后生物池单位容积需氧量为22.36、21.41 g/(m^(3)·h)。且低液位抽升易导致管网沉积物中颗粒态COD、TP的混入。虽监测到污染物浓度升高的初雨效应,但雨季进水OCPL略低,主汛期生物池单位容积需氧量为20.58 g/(m^(3)·h)。旱季、雨季非降雨日,早间时段进水OCPL与需氧量约为其他时段的1/2。不考虑雨水稀释作用,进水氨氮浓度全年保持稳定,Anammox对泥区回流液的处理,有效降低了生物系统氨氮负荷。The influent pollutant load of QH2 water reclamation plant in dry weather(before flood season,April;after flood season,November)and wet weather(prime flood season,July)was investigated.Results suggested that the influent pollutant load was affected by the urban water consumption characteristics,the operation and maintenance status of sewer pipe networks and the pumping strategy of water reclamation plant.In dry weather,both the water level ahead of screen in QH2 and the residential water consumption showed a bimodal distribution,and the peak interval time was also similar.The biological buffering,dilution buffering,and volume buffering effects of the sewer pipe networks on the collected wastewater varied with the low level water pumping in dry weather and the frequent high flow flushing in flood season.In dry weather,the influent oxygen-consuming pollutant load(OCPL)of QH2 was slightly higher,and the oxygen demand of activated sludge reactor before and after the flood season was 22.36 g/(m^(3)·h)and 21.41 g/(m^(3)·h),respectively.The particulate COD and TP fractions readily transformed from the sewer sediments to the influent water during low level water pumping.Although rising pollution levels in the early stage of rainfall was observed,the influent OCPL of QH2 in wet weather was slightly lower.The calculated oxygen demand in the prime flood season was 20.58 g/(m^(3)·h).In non-rainy days of dry and wet weather,the influent OCPL and oxygen demand in the morning time was about 1/2 of that in other time.Eliminating the dilution effect of rainwater,the influent ammonia nitrogen concentration stayed steady throughout the year.The reject water from sludge treatment with high ammonia nitrogen was effectively treated by anaerobic ammonium oxidation(Anammox)system,and the return ammonia load to the activated sludge process was significantly reduced.

关 键 词：再生水厂 污染物负荷 排水管网 低液位抽升 需氧量 

分 类 号：TU992[建筑科学—市政工程]