摘要
以稀释的猪场厌氧污水为供试水样,少根紫萍为供试生物材料,对夏、冬2季浅水体浮萍污水净化系统TN、NH4+-N和NOx--N(NO2--N与NO3--N之和)的去除途径进行了试验研究。结果表明,在夏季气温条件下,TN通过气态氨挥发、浮萍系统吸收/吸附NH4+-N和NOx--N得以去除,3途径去除的N分别占TN去除量的30.5%、15.9%和53.6%;NH4+-N通过气态氨挥发、浮萍系统吸收/吸附和硝化反应得以去除,3途径去除的N分别占NH4+-N总去除量的33.1%、17.3%和49.6%;NOx--N则完全通过浮萍系统吸收/吸附得以去除。在冬季气温条件下,TN通过气态氨挥发和浮萍系统吸收/吸附NH4+-N得以去除,2途径去除的N分别占TN去除量的31.7%和68.3%;NH4+-N通过气态氨挥发、浮萍系统吸收/吸附和硝化反应得以去除,3途径去除的N分别占NH4+-N总去除量的28.9%、69.5%和1.6%;而水体中的NOx--N含量始终保持稳定。
With diluted anaerobically pretreated wastewater from a pig farm and Spirodela oligorrhiza, TN, NH4^＋-N and NOx^- -N removal pathways in shallow-water duckweed-based wastewater treatment systems were studied in summer and win- ter. Results show that ,in summer,30.5% of the TN was removed through ammonia volatilization and 15.9% and 53.6% of NH4^＋ -N and NOx^--N through duckweed uptake/adsorption, respectively, and 33.1%, 17.3% and 49.6% of NH4^＋ -N through ammonia volatilization, duckweed uptake/adsorption and nitrification, respectively, and duckweed uptake/adsorption was the only pathway for removal of NOx^- -N. While in winter,31.7% and 68.3% of the TN was removed through ammonia volatilization and NH4^＋-N uptake/adsorption by duckweeds,respectively,28.9% ,69.5% and 1.6% of the NH4^＋-N through ammonia volatilization, duckweed uptake/adsorption and nitrification, respectively, and the content of NOx^- -N, however,remained unchanged.
出处
《生态与农村环境学报》
CAS
CSCD
北大核心
2006年第1期42-47,共6页
Journal of Ecology and Rural Environment
基金
国家科技部"863"项目(2003AA601020)
关键词
浮萍
污水净化
浅水体
氮
去除途径
duckweed
wastewater treatment
shallow-water
nitrogen
removal pathway
