%0 Journal Article
%T Algae trapping function of plant-bed/ditch systems<br>植物床-沟壕系统的藻类捕获功能
%A Zheng Jun
%A Chen Qinghu
%A Zhang Rongbin
%A Wang Weidong
%A Wei Hongbin
%A Yin Chengqing
%A <br>郑军
%A 陈庆华
%A 张荣斌
%A 王为东
%A 魏宏斌
%A 尹澄清
%J 环境工程学报
%D 2012
%I 
%X This case study corroborated the algae trapping function of plant-bed/ditch system through in situ field testing. Results showed that the system could effectively intercept and trap algae from source water. Under the driving of hydraulic gradients, about 35% source water flowed into the higher small ditch, and exuded through the root channel structure inside plant bed into the lower small ditch. The chlorophyll-a (Chl-a) concentration in the lower small ditch was significantly lower (P=0.0239) than that in the opposite higher small ditch. The decline percentage of Chl-a concentration amounted to 11.1 % between both sides of plant bed. The Chl-a concentration dropped down by 27.0 % at the outlet of examined root channel purification zone with plant-bed/ditch system as structure form. According to rough estimation, this patch of root channel purification zone could trap algae fresh biomass of about 122 kg/d. Shijiuyang constructed wetland contains altogether 11 patches of root channel purification zones and provides 250 000 t/d purified raw water for the drinking water plant. The total trapped algae fresh biomass reached up to about 1 100 kg/d.
%K plant-bed/ditch systems
%K algae trapping
%K constructed wetlands
%K root channel purification zone
%K land/water ecotones
%K drinking water source<br>植物床-沟壕系统
%K 藻类捕获
%K 人工湿地
%K 根孔净化区
%K 水陆交错带
%K 饮用水源
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=92E6F4267FD4CBCB51B1E49E014D8054&jid=3567BD61129AA59043F5DE01F8815DB5&aid=F1066E608B6765700B0FC54164ECE5ED&yid=99E9153A83D4CB11&vid=B31275AF3241DB2D&iid=59906B3B2830C2C5&sid=4B2D60FC063805F7&eid=A2313DA25AD7C123&journal_id=1673-9108&journal_name=环境工程学报&referenced_num=0&reference_num=17