A method for repairing micro-polluted water body and subsurface flow constructed wetland system

Abstract

The invention discloses a method for remedying the micro-polluted water body. The method comprises the following steps: 1) the micro-polluted water body firstly enters a first-stage water treatment area to perform sand settling and uniform water distribution; 2) the water body secondly enters a second-stage water treatment area-wetland bed, wherein the wetland bed is mainly composed of filler anda water plant, the water plant is giant reed, the filler is composed of upper filler and lower filler, the upper filler is gravel and the particle size is 5-10mm; the lower filler is the shale brick,the particle size of the shale brick is 10-60mm and the root system of the water plant grows in the filler; and 3) the water body finally enters a third-stage water treatment area to homogenize the effluent quality, and the water body can be discharged and enter the outer water body. The system has the following advantages: (1) no energy is consumed, the system is difficult to block; (2) the investment is low, the system is convenient to operate and manage; (3) the shock resistance is strong; and (4) the nitrogen-phosphorus removal rate is high and the system has a certain economic benefit.

Description

technical field [0001] The invention relates to a method for repairing polluted water bodies and the corresponding improved subsurface flow constructed wetland system of "Luzhu-shale bricks" for repairing polluted water bodies. field of environmental engineering. [0002] Background technique [0003] Slightly polluted source water refers to water bodies that are polluted by organic matter, and some water quality indicators exceed the standard for Class III water bodies in the "Environmental Quality Standards for Surface Water" (GB3838-2002). Slightly polluted water is generally caused by the sewage generated in industry, agriculture and life without proper treatment and directly discharged into water supply sources. Slightly polluted water mainly contains harmful pollutants such as particulate matter, trace organic matter, pesticides, and ammonia nitrogen. Micro-pollutants in slightly polluted water have the characteristics of large pollution range and wide influence ran...

AI Technical Summary

Problems solved by technology

[0006] However, there are some deficiencies in the treatment of slightly polluted water by constructed wetlands: ① Low hydraulic load: Under high hydraulic load, the effect of constructed wetlands on pollutant removal is very limited. Generally speaking, in order to achieve a better treatment effect, it should be kept low. hydraulic load

②Low removal rate of nitrogen and phosphorus pollutants: At present, most of the constructed wetlands that treat slightly polluted water bodies use canna, reed, calamus, etc. as wetland plants, and gravel, pebbles, gravel, etc. , 30%~50% on average

④Fillers are easy to saturate: wetland fillers such as crushed stones, pebbles and gravels have low saturated adsorption capacity, and their smooth surfaces are not conducive to the attachment and growth of microorganisms

Therefore, a large number of research results have found that the treatment effect of constructed wetlands is often high in the initial stage of operation, and as the treatment time increases, the treatment effect gradually declines

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