组合湿地在通风强化条件下循环处理鲟鱼养殖废水研究  

STUDY ON RECYCLING TREATMENT OF WASTEWATER FROM STURGEON REARING SYSTEM BY INTEGRATED CONSTRUCTED WETLANDS UNDER AERATION

作　　者：林玉良[1] 李谷[2] 张世羊[2] 陶玲[2] 李晓莉[2] 张珂[2] 

机构地区：[1]华中农业大学水产学院,湖北武汉430070 [2]中国水产科学研究院长江水产研究所,湖北武汉430223

出　　处：《水处理技术》2011年第12期109-114,119,共7页Technology of Water Treatment

基　　金：现代农业产业技术体系建设专项资金资助(CAR-46);农业部农业科技成果转化资金项目(2008GB23260394);中央级公益性科研院所基本科研业务费;中国水产科学研究院渔业水体净化技术和系统研究重点开放实验室开放基金项目(FWT-200701)

摘　　要：利用一组组合潜流人工湿地(下行流→上行流→水平流)和鱼池结合构建的循环水养殖系统,研究了养殖废水中污染物在各级湿地的运移规律以及不同曝气方式(连续与间歇曝气)下湿地的净化效果。结果表明,在水力负荷为6.6 m.d-1运行条件下,一级湿地对NO2--N有明显去除效果,去除率为57.8%;二级湿地对NO3--N、TN和TSS的去除明显,去除率分别为27.9%、11.0%和67.44%;三级湿地对NH4+-N、COD和TP的去除明显,去除率分别为14.8%、22.8%和18.5%。湿地出水水质经曝气增氧后满足鲟鱼养殖用水要求。通过湿地基质通风强化的方式,在气水体积比为2:3时,湿地内部DO含量分布状况得到改善,产生明显好氧-厌氧区,湿地净化效果有不同程度提高,其中,连续曝气对NH4+-N、TN和TP有较好的处理效果,间歇曝气对NO3--N和NO2--N有较好的处理效果,2种曝气方式对NH4+-N、NO3--N、NO2--N、COD的去除无显著差异。综合节能和净化效果,系统实际运行过程中选择间歇曝气优于连续曝气。A recirculating aquaculture system （R.AS） comprised settling tanks, filtration system （consisted of three-stage, i.e. down-, up- and horizontal in turn, subsurface flow constructed wetlands （CWs））, aeration tanks and culture tanks. The present study focused on the transport and purification mechanism of wastewater pollutants within the CWs and the impact of different aeration manners （continuously and intermittently） on purifying efficiency. The results showed that under the condition of high hydraulic loading rate that up to 6.6 mod-1, the removal rate for NOi-N was up to 57.8% in the first stage; in the second stage most ofNO3--N, TN and TSS was removed, and the removal rate were 27.9%, 11.0% and 67.44% ; while in the third stage it was NH4^-N, COD and TP being mainly removed, and the removal rate were14.8%, 22.8% and 18.5%. The water quality of outlet from CWs with aeration could meet the standard of sturgeon cultivation mainly. The distribution condition of dissolved oxygen was significantly improved after artificial aeration under the ratio of gas versus water flow being 2：3, which accordingly resulted in obvious aerobic／anoxic zones inside the CWs. The purifying capacity of the CWs was obviously increased by aeration. Continuous aeration and intermittent aeration, each had an advantage in water treatment, and continuous aeration had a better removal effect for NH4＋-N, TN, TP, intermittent aeration had a better removal effect for NO3-N, NO2-N, while the removal of NH4＋-N, NO3--N, NO2--N, COD, TN, TP had no significantly difference between continuous and intermittent aeration. Considering saving energy and purifying effect, intermittent manner was more suitable for aeration in this system.

关 键 词：人工湿地 循环水养殖系统 水力负荷 曝气 净化效果 

分 类 号：X714[环境科学与工程—环境工程]