Artificial oxygenation type composite underflow wet land sewage purification process

Abstract

The invention relates to an artificial oxygen increasing type combined subsurface flow wetland sewage purification technique, belonging to the field of water pollution control; aiming at the defects of artificial wetlands such as easy blockage, low purification capability and large seasonal fluctuation, a sewage purification technique which includes a biological strengthening sedimentation tank, a micro aeration vertical flow wetland and a subsurface horizontal-flow wetland is developed. The biological strengthening sedimentation tank can reduce the concentration of suspended substances, and the micro aeration vertical flow wetland can improve oxidative decomposition and nitrification effect of organic matter, can reduce the organic residue in a wetland system to the maximum extent and prolong the service life of the wetland. The subsurface horizontal-flow wetland can create an anoxia-anaerobic environment for the effluent of the micro aeration vertical flow; therefore, denitrification can be carried out more completely. The technique is applicable to the treatment of the domestic sewage from villages, small towns and scenic spots and the sewage entering lakes and rivers which is mixed with urban domestic sewage, and the deep purification of the tail water of sewage treatment plants.

Description

(1) Technical field [0001] This technology belongs to the field of water pollution control, and can be applied to the treatment of domestic sewage in villages, towns and tourist attractions, as well as the sewage treatment of rivers entering lakes mixed with urban domestic sewage, and the deep purification of tail water from sewage treatment plants. (2) Background technology [0002] Constructed wetlands, as a technology for water pollution control, have been widely used and developed around the world since they originated in Europe in the 1960s. A water pollution control process that combines wetlands and surface flow wetlands as the main body and combines multiple layout methods. But like other purification processes, the advantages of constructed wetland technology are obvious, but the disadvantages are also prominent. While everyone is attracted by its advantages such as low investment and operation costs, good ecological security, and strong scale applicability, its sh...

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Problems solved by technology

[0003] How can we improve the treatment capacity and purification effect of the wetland system, and prolong its service life? Many researchers have found that the low oxygen utilization rate is the main reason for the low purification efficiency of constructed wetlands. Under anoxic conditions, organisms cannot perform normal aerobic respiration, and the concentration of certain elements and organic substances in the reduced state can reach toxic levels.

The lower oxygen concentration leads to a decrease in the oxidation and decomposition rate of organic matter in the wetland system, and the nitrification reaction is not complete, which limits the removal of nitrogen in the wetland system [5-6] , and the blockage of the wetland system is mostly caused by the retention and accumulation of suspended solids and organic matter in the sewage system in the wetland system [7-8]

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