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Method for controlling water eutrophication by using hydrogen nitrate and formic acid

A technology for eutrophication and eutrophication of water bodies, applied in chemical instruments and methods, neutralized water/sewage treatment, water/sewage treatment, etc. The implementation cost is expensive and other problems, to achieve the effect of improving redox conditions, convenient implementation, and reducing the formation and release of odorous substances

Inactive Publication Date: 2013-07-24
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Among the existing measures to control water eutrophication, accelerating water exchange can reduce the phosphorus content in eutrophic water, but this kind of operation is not feasible in many practical situations; dredging can reduce the release of phosphorus from surface sediments, but implementation Expensive; the use of calcium nitrate, iron, and aluminum compounds can enhance the sediment's ability to adsorb phosphorus, but the reliability of the treatment effect is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In a transparent plexiglass column with a diameter of 5 cm and a height of 200 cm, the bottom is 0-20 cm of the surface sediment of Meiliang Bay, Taihu Lake, and the water is 160 cm deep. The pH of the overlying water is 8.9, NH 4 + -N and NO 3 — The contents of N, water-soluble P and COD were 1.0, 1.0, 0.2 and 23.8 mg / L, respectively, and the concentration of chloroplast a was 18.7 mg / m 3 .

[0023] In the first set of treatments, the pH was less than 6.5 after adding 1.2 mM nitric acid and 0.3 mM formic acid to the overlying water;

[0024] In the second set of treatments, 1 N nitric acid was injected at a depth of 10 cm in the sediment so that the average concentration of nitrate in the 0-20 cm sediment was 30 mM;

[0025] In the third group of treatments, in addition to adding 1.2 mM nitric acid and 0.3 mM formic acid to the overlying water, 1 N nitric acid was injected at a depth of 10 cm in the sediment, so that the average concentration of nitrate in the 0-2...

Embodiment 2

[0030] For eutrophic water bodies affected by periodic outbreaks of cyanobacteria, slow water body exchange, effective control of exogenous phosphorus input but serious endogenous phosphorus pollution, such as drinking water bodies, aquaculture water bodies and landscapes that have lost their application value due to severe eutrophication Water body, add nitric acid and formic acid to the water body to reduce the pH of the water body, so that the average pH of the water body under light conditions is below 8.0, improve the redox state of the water-sediment interface, and reduce the generation of cyanobacteria blooms and odor substances Formation and release; then improve the redox status of the water body-sediment interface, reduce the intensity and channel of cyanobacterial blooms and finally eliminate cyanobacterial blooms.

[0031] The periods of adding nitric acid and formic acid to the treated water can be:

[0032] In the low temperature season with slow algae growth, ad...

Embodiment 3

[0039]For eutrophic water bodies affected by periodic outbreaks of cyanobacteria, slow water body exchange, effective control of exogenous phosphorus input but serious endogenous phosphorus pollution, such as drinking water bodies, aquaculture water bodies and landscapes that have lost their application value due to severe eutrophication For water bodies, nitric acid is added to the sediment interface of 10-50 cm, the nitric acid added to the sediment improves the redox state of the water-sediment interface, reduces the formation and release of odorous substances in the water body, and enhances the stability of phosphorus in the sediment . This in turn improves the redox status at the water-sediment interface, reduces the intensity of cyanobacterial blooms and eliminates cyanobacterial blooms.

[0040] The period of adding nitric acid to the sediment: the non-explosion period of cyanobacteria between autumn and spring is the best. After the addition of nitric acid, the averag...

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Abstract

A method for treating eutrophic water by using nitric acid and formic acid is provided. In order to treat eutrophic water and solve the problem of periodic outbreak of blue algae caused by eutrophic water, the nitric acid and the formic acid are added into the eutrophication water and / or the nitric acid is added into sediment interface of the eutrophic water with depth of 10-50 cm, wherein the water exchange is slow, the exogenous phosphorus pollution is controlled effectively while the endogenous phosphorus pollution is serious. The acid process in the water and the sediment improves the oxidation-reduction condition of the water-sediment interface, reduces the content of phosphorus in the water and the release strength of the sediment phosphorus, and further reduces the strength and frequency of outbreak of the blue algae and finally eliminates the outbreak condition of blue algae.

Description

technical field [0001] The invention relates to environmental protection, in particular to a method for treating eutrophication of water body by using nitric acid and formic acid. Background technique [0002] Due to watershed pollution and improper aquaculture, many large and small lakes, reservoirs and ponds in my country, represented by Dianchi Lake, Taihu Lake and Chaohu Lake, are already in a state of eutrophication. Landscape water bodies in many cities are no exception. The periodic outbreak of blue-green algae caused by water eutrophication leads to the deterioration of water quality, which threatens the safety of aquaculture and drinking water, and reduces the quality of the surrounding ecological environment. [0003] In order to control cyanobacteria outbreaks, at least the nitrogen or phosphorus needed for the growth of algae in the water body should be controlled below a certain concentration. The content of nitrogen in water is generally much higher than that...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/00
CPCC02F1/66
Inventor 黄斌史奕陈欣
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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