摘要
针对连续流人工湿地脱氮效率低、占地面积大的问题,提出序批式深床人工湿地DSCW(deep sequence constructed wetlands),考察了湿地深度、填料粒径及运行工况对其处理生活污水效能的影响。研究结果表明,当深度由0.5m增加至2m时,深度对处理效能影响不显著;序批式运行工况对处理效能影响显著,在温度为20～25℃,运行工况为进水8min-反应12h-出水8min-闲置12h的条件下,床深为2m的DSCW系统对生活污水COD、NH4+-N、TN、PO34--P去除率分别为83.8%、54.1%、48.1%、63.9%,COD、TN、PO34--P分别对应的去除面积负荷为128、17.6、1.49g/(m2.d),较传统人工湿地分别提高2.4倍、2倍和1.71倍,每处理1m3的污水占地面积为1.87m2,较传统湿地减少3～5倍。卵石基质粒径为5～10mm与粒径为20～30mm的DSCW系统相比COD、NH4+-N、TN和PO43--P去除率分别提高3.8%、7.9%、3.8%和7.0%,填料粒径对处理效能有一定的影响。
According to the problems that traditional constructed wetlands have low nitrogen removal performance and large areas,deep sequence constructed wetlands（DSCW） is proposed and the influences of depth of wetland,filler particle size and operational states of DSCW on treatment efficiency are investigated.The experimental results show that when the depth of wetland is increased from 0.5 m to 2 m,it has no significant influent on its treatment efficiency.The running condition has influence on its treatment efficiency.When the water temperature is 20~25 ℃ and operating condition of DSCW is inlet water 8 min-reaction 12 h-outlet water 8 min-idle 12 h,the removal rate of COD,NH＋4-N,TN,PO3-4-P is 83.8%,54.1%,48.1%and 63.9% respectively by DSCW with the depth of 2 m.The area load for COD,TN,PO3-4-P is 128,17.6,1.49 g/（m2·d） respectively,raised 2.4 times,2 times and 1.71 times respectively compared with traditional constructed wetlands.Land occupation for processing 1 m3 wastewater is 1.87 m2,decreasing 3~5 times commendably.Compared to DSCW system of particle size of gravel of 20~30 mm,the removal rate of COD,NH＋4-N,TN and PO3-4-P of DSCW system of 5~10 mm is increased by 3.8%,7.9%,3.8% and 7% respectively.The filler particle size exhibits some influences on DSCW efficiency.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第11期148-154,共7页
Journal of Chongqing University
基金
国家水体污染控制与治理科技重大专项(2009ZX07315-005)
关键词
人工湿地
序批式
深度
填料粒径
constructed wetlands
sequencing batch
depth
filler particle size
