Artificial wet land water treatment technology

Abstract

The invention discloses a constructed wetland water treatment process, in particular to a rainstorm runoff or a low-concentration refractory organic waste water treatment process with relatively low C / N. The process adopts circular artificial wetland, that is, the wetland adopts two or more groups in parallel, each group is connected in series by four canals, and the wetland water inlet is equipped with a biological contact area, and the biofilm on the filler in the contact area operates according to the anoxic-aerobic process ; The two channels outside the wetland reserve open water surfaces and add underwater propellers; set up an air-water backwashing system at the water inlet of the wetland. There is a perforated air pipe under the filler; the grit chamber is used in conjunction with the circulation wetland. The artificial wetland water treatment process of the invention can effectively remove refractory organic substances and nitrogenous substances such as ammonia nitrogen and organic nitrogen in micro-polluted source water, improve the operation effect of conventional water treatment processes, and enhance water safety. Slightly polluted source water reaches or exceeds Class III surface water after passing through the circulation wetland; storm runoff.

Description

technical field [0001] The invention relates to a water treatment process for constructed wetlands, especially a treatment process for rainstorm runoff, organic waste water with low concentration, refractory degradation and low C / N, that is, high nitrogen water. Background technique [0002] Because the runoff from green land or farmland carries nutrients such as soil particles, organic matter (mainly humus), N, P, etc., if it is not treated and directly enters large-volume water bodies such as artificial lakes and reservoirs, it will cause water hypoxia and eutrophication ; The concentration of organic matter in some large lakes is low and mainly refractory organic matter, the concentration of TN in the water is relatively high, and the C / N is low. When such water is used as supplementary water for landscape park water, conventional water treatment processes should be adopted Difficult to meet water quality requirements. For the treatment process of surface water, (pre-chl...

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Problems solved by technology

[0002] Because the runoff from green land or farmland carries nutrients such as soil particles, organic matter (mainly humus), N, P, etc., if it is not treated and directly enters large-volume water bodies such as artificial lakes and reservoirs, it will cause water hypoxia and eutrophication ; The concentration of organic matter in some large lakes is low and mainly refractory organic matter, the concentration of TN in the water is relatively high, and the C / N is low. When such water is used as supplementary water for landscape park water, conventional water treatment processes should be adopted Difficulty meeting water quality requirements

For the treatment process of surface water, (pre-chlorination)-coagulation-sedimentation (clarification)-filtration-disinfection process is often used at present. Ammonia has little effect

Ammonia nitrogen will react with chlorine to produce chloramine, which has a slow disinfection effect and requires a long contact time, and chloramine has an odor; for organic matter in water, the breakpoint chlorination method is often used for treatment, but since it was found that organic pollutants in water can After forming trihalomethanes (THMs) with chlorine, the use of breakpoint chlorination to treat polluted water sources has aroused concern, so an effective method for removing high nitrogen and organic pollutant water has been sought

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