An ecological infiltration system for advanced treatment of tail water in a sewage plant and a method for treating tail water

Abstract

The invention discloses an ecological infiltration system for deep treatment of tailwater from a sewage plant and a tailwater treatment method. The ecological infiltration system comprises a decoloration and disinfection tank, a coagulating basin and an ecological infiltration tank, wherein standard tailwater firstly enters into a chlorine dioxide disinfection tank, stays for 2 to 4 hours, and then enters into the coagulating basin, SS in the tailwater is basically removed by use of the coagulating action of polyferric chloride or polyaluminium chloride, the removal rate can be up to 90 to 95%, and furthermore, 15 to 30% of pollutants such as COD, TN and TP can be removed. The tailwater subjected to coagulating treatment finally enters into the ecological infiltration tank, and is further purified under the coaction of plants, animals, microorganisms and a filter material layer from top to bottom, and then is discharged through a matrix drainage layer, the discharged water reaches the irrigation water standard, and thus the treatment process is finished; the final treatment effluent water reaches the irrigation water standard. The technical system is low in sewage treatment cost and has favorable market generalization performance.

Description

technical field [0001] The invention belongs to the field of environmental engineering and relates to a method for treating waste water, in particular to an ecological percolation system for recycling tail water of a sewage plant and a method for treating tail water by using the system. [0002] technical background [0003] my country is a country seriously short of water. The per capita water volume is only equivalent to 1 / 4 of the world's per capita water volume. The shortage of fresh water resources has affected the social and economic development in many areas of our country. At the same time, in recent years, my country's water pollution situation has become increasingly serious. Water shortages have made the original shortage of fresh water resources frosty. Controlling water pollution discharge has important practical value and strategic significance for alleviating my country's water resource shortage. For this reason, sewage treatment plants have been built in vario...

AI Technical Summary

Problems solved by technology

However, the carbon source in the tail water is not enough to supply microorganisms for normal denitrification. Supplementing carbon sources has become an indispensable process for the treatment of tail water in constructed wetlands, resulting in new budget expenditures

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