城市污水管网中水质变化特性  

Characteristics of water quality variation in sewer networks

作　　者：金鹏康[1] 郝晓宇[1] 王宝宝[1] 郭海泉[1] 张荔[1] 

机构地区：[1]西安建筑科技大学环境与市政工程学院,西安710055

出　　处：《环境工程学报》2015年第3期1009-1014,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(2012ZX07313001);新世纪优秀人才(NCET-12-1043);陕西省创新团队(IRT2013KCT-13)

摘　　要：以管网中城市污水为研究对象,通过模拟管道的循环流动研究了水质变化特性。结果表明,在水力流动6 h的条件下,因管道沉积和管内微生物作用,城市污水中的TCOD(总有机物)去除率为10.79%,其中,沉积和生物降解作用对TCOD去除的贡献率分别为68.85%和31.15%。而管道中的氮类污染物的去除率为11.15%,管道沉积与生物降解作用各占约50%,其中生物降解引起的氮类污染物的变化主要是水中有机氮转化为NH3-N(NH3-N由35.51 mg/L升至38.38mg/L),以及反硝化作用造成的NO3-N转变(NO3-N由2.36 mg/L降至0.84 mg/L)。总磷的变化相对较小,与管道内相对稳定的缺氧环境有关。Simulated sewer networks system was used to study variation of water quality in sewer system.Results showed that under the condition of 6 h of hydraulic flow,the total COD( TCOD) removal efficiency in urban sewage is 10. 79% because of sedimentation and biodegradation process. Furthermore,68. 85% of the COD removal is attributed to sedimentation effect while the rest is related to 31. 15%. Meanwhile,removal efficiency of TN in sewer is 11. 15% and sedimentation and biodegradation process account for 50% respectively.Transformation of nitrogen pollutants caused by biodegradation were mainly conversion of organic nitrogen to NH3-N( NH3-N rises from 35. 51 mg / L to 38. 38 mg / L) and removal of NO3-N caused by denitrification process( NO3-N drops from 2. 36 mg / L to 0. 84 mg / L). The elimination of the total phosphorus is relatively small,which is because of stable anaerobic environment in the sewer networks.

关 键 词：水质变化 沉积作用 生物降解 

分 类 号：X703[环境科学与工程—环境工程]