Method for treating black and odorous river

Abstract

The invention discloses a method for treating a black and odorous river. The method sequentially comprises the following steps: digging out black and smelly soil of the black and odorous river, carrying out mixing according to a proportion of adding 0.1-0.25kg of quicklime per kg of black and smelly soil, filling the mixture into a woven bag after mixing, depositing the woven bag for 7-10 days, carrying out lime hardening, transporting the black and smelly soil filled in the woven bag to one end of the river, building a low dam, filling the black and odorous soil filled in the woven bag at thebottom of the river under the low dam to form a gradient slope, arranging a water pump in the low dam, pumping water into the low dam from a water taking opening in the other end of the river until the water overflows, and allowing the water to flow on the gradient slope to finally reach the other end of the river, wherein the processes is repeated, and the water quality is improved through oxygenation. The invention has the advantages that quicklime is used for fixing the black and odorous soil, and a gradient slope is formed by the quicklime, so that the problem that the black and odorous soil is difficult to treat is solved; a falling flow system is formed by the gradient slope, oxygenation is realized, and the purpose of improving the water quality of the river is achieved.

Description

technical field [0001] The invention relates to the field of water body treatment, in particular to a treatment method for black and odorous rivers. Background technique [0002] Urban black and smelly water is a water environment problem that people strongly report, which not only damages the urban living environment, but also seriously affects the image of the city. [0003] In the prior art, the black and odorous water body is generally treated by two methods, one is the aeration method, and the aeration method is to increase the oxygen content in the water body by introducing air or oxygen into the black and odorous water body. When using this method to treat black and odorous water bodies, a large amount of oxygen-containing gas needs to be introduced, and the scale is huge. At the same time, this method cannot reduce the concentration of nitrogen and phosphorus in the water body. Therefore, it cannot fundamentally solve the problem of water body pollution. Black and s...

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Problems solved by technology

[0003] In the prior art, the black and odorous water body is generally treated by two methods, one is the aeration method, and the aeration method is to increase the oxygen content in the water body by introducing air or oxygen into the black and odorous water body. When using this method to treat black and odorous water bodies, a large amount of oxygen-containing gas needs to be introduced, and the scale is huge. At the same time, this method cannot reduce the concentration of nitrogen and phosphorus in the water body. Therefore, it cannot fundamentally solve the problem of water body pollution. Black and odorous problem; the other is the method of planting plants, through which the nitrogen and phosphorus in the black and odorous water body can be absorbed, but in this method, the oxygen produced by the photosynthesis of the herb is released into the air through the leaves, which is difficult to solve The problem of low dissolved oxygen in black and odorous water, therefore, the treatment effect is not obvious and the treatment efficiency is low

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