摘要
采用序批式进水方式,在m(固)∶V(液)=1∶20及水力负荷1.25 m3.m-2.d-1条件下,研究种植旱伞草(Cyperus alternifolius)、芦苇(Phragmites australis)、美人蕉(Canna indica)和菖蒲(Acorus calamus)4种植物的矿化垃圾填料湿地对畜禽养殖废水的处理效果。持续运行90 d的结果表明,矿化垃圾填料湿地床对CODCr、SS、NH4+-N和TP的平均去除率分别为41.3%～52.5%、55.2%～72.1%4、4.2%～76.7%和40.1%～68.0%。不同植物种类对去除率的影响小,与无植物空白相比约有10百分点的变化,主要被矿化垃圾填料自身特性所掩盖。矿化垃圾填料硝化能力强,导致硝酸盐氮(NO3--N)的累积高达数十mg.L-1,并导致TN去除率偏低,仅为41.6%～45.9%。构建了150 cm高的矿化垃圾填料柱进行反硝化脱氮,在水力负荷0.30 m3.m-2.d-1条件下运行90 d期间内,距柱面120 cm处NO3--N去除率在ρ(NO3--N)约为20和40 mg.L-1的水质条件下均可达97%以上。
Effect of a constructed wetland bed of mineralized refuse treating livestock wastewater was studied,using the sequencing batch inflow method that kept the inflow at 1∶20 = m（solid）∶V（liquid） and 1.25 m3·m-2·d-1 in hydraulic loading,and had 4 kinds of plants（Cyperus alternifolius,Phragmites australis,Canna indica,and Acorus calamus） growing.After 90 days of continuous operation,the bed removal rates were achieved to 41.3%-52.5%,55.2%-72.1%,44.2%-76.7% and 40.1%-68.0% of CODCr,SS,NH＋4-N and TP,respectively,from the wastewater.The effect of plants differed slightly within only 10 percentage point or so from CK（no plant）,because it was obscured by the characteristics of the mineralized refuse filler per se.The mineralized refuse was very strong in nitrification capacity,thus leading to accumulation of as high as over 10 mg·L-1 NO-3-N,and a low TN removal rate,being only 41.6%-45.9%.Therefore,a 150-cm-high column was filled with mineralized refuse to create an anaerobic condition for denitrification.After 90 days of operation with hydraulic loading kept at 0.30 m3·m-2 ·d-1,the column obtained a NO-3-N removal rate at the depth of 120 cm as high as 97% or beyond,when NO-3-N concentration in the influent was about 20 and 40 mg·L-1.
出处
《生态与农村环境学报》
CAS
CSSCI
CSCD
北大核心
2011年第2期95-99,共5页
Journal of Ecology and Rural Environment
基金
国家水体污染控制与治理科技重大专项(2008ZX07101-007)
2010环境保护部南京环境科学研究所-中央级公益性科研院所基本科研业务专项
江苏省自然科学基金面上项目(SBK-201020326)
关键词
矿化垃圾
畜禽养殖废水
去除率
植物种类
反硝化
mineralized refuse
livestock wastewater
removal rate
vegetation species
denitrification
