Wetting and drying alternation type sewage purification method

Abstract

The invention discloses a wetting and drying alternation type sewage purification method. Sewage flows into a wetland filler layer of a wetting and drying alternation type sewage purification device until the sewage submerges wetland filler, the wetland filler is submerged in the sewage to be in an anaerobic state, and gaps of the wetland filler are filled with air to be in an oxygen-containing state when the sewage is pumped out of the wetland filler layer, so that the wetland filler and sewage are in a wetting and drying alternation circulation state. A natural siphon or water pump including but not limited to a siphon pipeline pumps out sewage intermittently, so that the wetting and drying alternation function of an upper wetland filler layer is realized. Wetting and drying alternation circulation of the wetland filler in the sewage is realized, and the gaps of the wetland filler are in an oxygen-enriched state due to the fact that oxygen is accommodated in the gaps of the wetland filler and root systems of a wetland plate are contacted with air, so that the treatment effect of sewage is improved. Devices are used simultaneously in a parallel-connection or series-connection manner, and the continuous stable effect of water quality of the treated domestic sewage is remarkable.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a method for purifying sewage by alternately drying and wetting. Background technique [0002] Sewage is an important factor causing pollution of rivers, rivers, lakes and other water areas; currently, in order to treat sewage to reduce the impact of sewage on the water environment, various sewage purification facilities and treatment technologies are constantly being used. Among them, the treatment of domestic sewage, especially the traditional constructed wetland sewage treatment technology, has been widely used in the treatment of domestic wastewater due to the small investment. However, in the process of sewage treatment of constructed wetland, the wetland filler (soil) is being treated after the wetland has been operated for a period of time. The easy clogging in the system leads to sewage siltation, the breeding of mosquitoes and flies on the exposed water surface, black and smel...

AI Technical Summary

Problems solved by technology

Among them, the treatment of domestic sewage, especially the traditional constructed wetland sewage treatment technology, has been widely used in the treatment of domestic wastewater due to the small investment. However, in the process of sewage treatment of constructed wetland, the wetland filler (soil) is being treated after the wetland has been operated for a period of time. The easy clogging in the system leads to sewage siltation, the breeding of mosquitoes and flies on the exposed water surface, black and smelly water, and a series of follow-up problems affecting the sewage treatment effect are becoming more and more prominent, which makes the treatment facilities after investment have high operating costs, short service life, and high sewage treatment discharge. The expected design effect is not achieved, resulting in the facility being scrapped, and at the same time causing serious secondary pollution to the local environment

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