Artificial wetland waste water pretreatment method for small-town waste water treatment

Abstract

An artificial wetland waste water pretreatment method for small-town waste water treatment aims at overcoming the defects that in the prior art, the water quality of a small-town waste water treatment system is larger in fluctuations, larger impact is caused on stable running of the treatment system, and the treatment efficiency of an artificial wetland system dramatically declines in winter in the north. The method comprises the steps that 1, waste water enters a grille pool, and interception treatment is conducted; 2, treated waste water enters a biological selection area; 3, the treated waste water enters a biological reaction area, activated sludge degrades pollutants such as organic matter, nitrogen and phosphorus which exist in the domestic waste water, and an aerating system automatically controls dissolved oxygen concentrations of different zones of the biological reaction area; 4, the treated waste water enters a coagu-flocculation reaction area, and a coagu-flocculation reaction is conducted after flocculating agents are added; 5, the treated waste water enters a settling zone, and settling sludge partially back flows to the biological selection area; 6, residual sludge enters a sludge concentration area; 7, the waste water which is treated in the fifth step enters an artificial wetland. The artificial wetland waste water pretreatment method for the small-town waste water treatment improves the anti-impact capacity of the system and is suitable for being used in the environment of small-town waste water with larger fluctuations in the water quality.

Description

technical field [0001] The invention relates to the field of artificial wetlands, in particular to a method for pretreatment of artificial wetland sewage used for sewage treatment in small towns. Background technique [0002] Constructed wetlands are artificially built and supervised and controlled grounds similar to swamps, through the triple synergy of physics, chemistry and biology in the natural ecosystem to purify sewage. Constructed wetland optimizes the fillers, microorganisms, plants and water distribution methods in the natural wetland system, and strengthens the pollutant removal efficiency of the natural wetland system. The system has the characteristics of good treatment effect, simple process, low investment and low operating cost. Especially suitable for small town sewage treatment system. [0003] Constructed wetlands, as an ecological pollution control technology, also have disadvantages such as large area, low pollution load, poor operation management and e...

AI Technical Summary

Problems solved by technology

[0004] The present invention overcomes the disadvantages in the prior art that the water quality of the sewage treatment system in small towns fluctuates greatly, which causes a great impact on the stable operation of the treatment system, and the treatment efficiency of the artificial wetland system decreases obviously in winter in the north, and provides a method for Method for pretreatment of constructed wetland sewage in small town sewage treatment

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