城市废水污灌的生态效应及生态处理技术

The Possibility of Municipal Wastewater Treated by Constructed Wetlandsfor Agricultural Irrigation

我国工农业生产与城市严重缺水,城市污水处理率低,在客观上要求城市污水经生态处理后回用于农业。人工湿地污水处理系统利用基质、植物和微生物这个复合生态系统的物理、化学和生物的三重协调作用,通过过滤、吸附、共沉淀、离子交换、植物吸收和微生物分解来降解污染物质,不仅其出水水质能够达到农田灌溉水质标准,而且由于其具有出水水质稳定、对营养物质去除能力强、基建和运行费用低、技术含量低、维护管理方便等优点,因此人工湿地完全有可能替代传统二级污水处理厂高效净化污水,并将处理出水用于灌溉农田,实现农业的可持续发展。参36。

Since water is becoming an increasingly scarce commodity, municipal wastewater effluent is now being considered as a new water resource that can be used for agricultural irrigation to solve water shortages. However,much of the municipal wastewater is not treated before it＇ s drained onto the famalands, which leads to a series of problems. Alternatively, constructed wetlands can be used to treat wastewater to alleviate bad effects. The wetland, as a land-intensive biological treatment system, has integrated purifying mechanisms, including physical-chemical processes such as substrate adsorption, substrate fdtration, plant adsorption, pollutant sediment,ion exchange, and biochemical processes such as plant sorpfion,microbiolagy oxidation,microbiology ammunition, The advantages of constructed wetlands are relatively low cost,simple operation and convenient maintenance. The reclaimed water quality is very stable and meets the state requirements for irrigation. So, in a sense, it is possible for the effluent from constructed wetlands to be used for agricultural irrigation. In this way, agriculture can develop in a sustainable way.