摘要
针对工程实践中人工湿地内部结构设计依据缺乏的现状,研究了人工湿地各结构层的净化效能贡献率。结果表明:土壤层既有净化作用又有持续的溶出渗漏效应,其对COD去除率、浊度和色度的净贡献为-2.6%、-74.8%、13.2%;植物和填料生物是湿地COD净化的主力,占比分别为20.1%和64.1%,但同时也是出水色度的主要来源,占比分别为34.9%和59.5%;持水层有良好的过滤性能和辅助净化功能,承担了74.8%浊度去除量,对色度和COD去除分别有30.2%、16.2%的贡献率;研究建议工程实践中可设计无土壤层的滴滤式人工湿地,从而降低湿地的堵塞风险,结合周期布水提高DO渗透深度,进而提升出水水质;研究建议采用无纺布替代土壤层在集排水层和填料层之间设单层或多层持水过滤层进行滤速控制、控制反应器内布水形态和反应时间。
Aiming at the current situation that the internal structure design of artificial wetland lacks the basis in the engineering practice, this paper studies the purification efficiency contribution rate of every structure layer of artificial wetland. The result shows that the soil layer has not only the purification role, but also the continuous dissolution leakage effect. Its net contribution rates of COD removal rate, turbidity and chromaticityare-2.6%,-74.8% and 13.2%. The plants and stuffing biology are the main forces of COD purification in the wetland with the proportions by 34.9% and 59.5% separately. The aquifer has the good filtering performance and auxiliary purifying function, and bears the 74.8% turbidity removal amount. The contribution rates of chromaticity and COD removal are 30.2% and 16.2% separately. The study proposes that the non-soil layer of trickle filter artificial wet land can be designed in the engineering practice so as to reduce the blocking risk of wetland. Combined with the cycle water distribution, the DO penetration depth is improved so as to upgrade the water quality of effluent. The study proposes that the non-woven fiber is used to replace the soil layer, and to set up the single-layer or multi-layer water-holding filter layer between the drainage layer and stuffing layer for controlling the filter speed, and controlling the water distribution form and response time in the reactor.
作者
林媛媛
鲍炯炯
吴伟
俞阜东
Lin Yuanyuan;Bao Jiongjion;Wu Wei;Yu Fudong
出处
《城市道桥与防洪》
2019年第2期109-112,M0012,M0013,共6页
Urban Roads Bridges & Flood Control
关键词
人工湿地
结构
降解
土壤层
持水层
artificial wetland
structure
degradation
soil layer
water-holding layer
