Economical crop type filter bed-tidal flow artificial wetland combined sewage treatment system

Abstract

The invention discloses an economical crop type filter bed-tidal flow artificial wetland combined sewage treatment system which is composed of two systems: an aquatic vegetable filter bed and a tidal flow undercurrent artificial wetland. According to the treatment system disclosed by the invention, a lot of granular pollutants are intercepted through a plant root system cushion layer in the aquatic vegetable filter bed and the pollutants are taken away from a water body along with plant residues when the plants are harvested, so that the problem of the follow-up blockage of the tidal flow artificial wetland can be effectively solved; the tidal flow artificial wetland operates by way of inflowing-detaining-draining-idling, and absorb oxygen in air into a wetland matrix by means of periodical changes of a saturated infiltrated surface of the bed body, so that the oxygen transmission amount in the wetland bed body is increased, the oxygen environment of the wetland is improved, and therefore, the removal effect of organic matters and ammonia nitrogen in the wetland is enhanced, and haycite and gravels in the wetland matrix have a relatively strong adsorption effect on phosphorus. The system is low in treatment cost, good in nitrogen and phosphorus removal effect, convenient to manage and operate and suitable for treating rural dispersed household sewage.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, in particular to an economic crop type filter bed-tidal flow artificial wetland combined sewage treatment system. Background technique [0002] After the emergence of sewage collection technology, natural wetlands have become convenient places for sewage discharge. Many countries still use natural wetlands to directly discharge sewage or rainwater. Constructed wetland is a kind of sewage ecological treatment technology based on natural wetland, which is composed of substrate, water body, plants, microorganisms and medium and low plants. Sewage is purified under the synergy of wetland substrate, plants and microorganisms. According to the different water flow modes of sewage in the wetland bed, constructed wetlands are usually divided into three types: surface flow constructed wetlands, horizontal subsurface flow constructed wetlands and vertical subsurface flow constructed wetlands. ...

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Problems solved by technology

[0005] Technical problem to be solved: the purpose of this invention is to solve the problems of low reoxygenation capacity, insufficient denitrification effect, easy clogging and low economic benefit of traditional constructed wetlands, and provide a combined sewage treatment system of economic crop type filter bed-tidal flow constructed wetland , using the plant root cushion in the filter bed to intercept a large amount of particulate pollutants and bring them out of the water body with the plant residues during harvesting, so as to prevent the blockage caused by sewage flowing through the tidal flow artificial wetland

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