Multistage aeration oxidation pond-gravel bed-constructed wetland tail water efficient treatment system

Abstract

The invention relates to the technical field of water treatment, in particular to a multistage aeration ecological oxidation pond-gravel bed-constructed wetland tail water efficient treatment system.The treatment system comprises: an adjusting tank; an ecological oxidation pond; an ecological gravel bed; an efficient vertical flow constructed wetland; and an aeration clean water tank. Directed atthe problems that the traditional constructed wetland is sensitive to suspended solids and the dissolved oxygen content of effluent water is not high, the system provided by the invention integratesand optimizes multiple processes, the ecological oxidation pond and the ecological gravel bed are adopted for pretreatment, the constructed wetland is covered with a grit layer to relieve silt blockage of the wetland in the flood period, and a microporous nano-material is employed for aeration in the ecological oxidation pond and the clean water tank, thus significantly increasing the dissolved oxygen content of effluent water. The three processes are combined in series to complement each other's advantages, and multistage microporous nano-aeration is carried out in the ecological oxidation pond and the clean water tank at the same time, and through the above ecological treatment process, the main water quality indexes can stably reach the class III water standards of surface water. The system also has the advantages of low investment, strong water quality and quantity fusion adaptability, simple operation, good ecological landscape effect and the like.

Description

technical field [0001] The invention relates to the technical field of tail water advanced treatment, in particular to a multi-stage aeration oxidation tank-gravel bed-constructed wetland tail water efficient treatment system. Background technique [0002] At present, my country's urban sewage treatment plants mainly use COD Cr 、BOD 5 , SS, nitrogen and phosphorus are the main removal objects, and most of their discharge is in accordance with the first-level A or first-level B standard in the national "Pollutant Discharge Standards for Urban Sewage Treatment Plants" (GB18918-2002), which is consistent with the "Surface Water Environmental Quality Standard (GB3838-2002), there is still a big gap in the minimum standard of Class V water, and its tail water can only be used for landscape water supply or municipal miscellaneous purposes. For the widely existing damaged water ecosystem in my country, this cannot fundamentally solve the problem of eutrophication of the receiving...

AI Technical Summary

Problems solved by technology

However, the traditional constructed wetland technology has the disadvantages of large area, easy to block, low dissolved oxygen content in the effluent, and is sensitive to the quality and quantity of influent water, and the season and temperature affect the treatment effect, etc.

The patent with the publication number of CN 103253822 A claims to use oxidation pond and gravel bed as pretreatment, vertical flow constructed wetland, stabilization pond and surface flow constructed wetland to carry out integrated tail water advanced treatment technology, but there are still problems such as long hydraulic retention time and land occupation. The area is large, and many auxiliary projects are needed for supporting, especially its effluent is only COD Cr and BOD 5 Meets Surface Water Class III Standard, NH 3 -N and TP only meet the standard of surface water IV, and still cannot meet the water control needs of modern cities with tight land use and high requirements for river water quality

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