Method for inhibiting release of substrate sludge nutritive salt of eutrophic water body

A technology of eutrophication and nutrient salt, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve problems such as poor results, achieve easy control, convenient operation, and increase agglomeration performance Effect

Active Publication Date: 2010-08-25
京水(北京)生态环境治理股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the problems of the existing in-situ passivation method for eutrophic water sediment, the present invention proposes a method for inhibiting the release of nutrients from eutrophic water sediment, which can effectively and economically inhibit eutrophication Sediment nutrient release

Method used

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  • Method for inhibiting release of substrate sludge nutritive salt of eutrophic water body
  • Method for inhibiting release of substrate sludge nutritive salt of eutrophic water body

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Embodiment 1

[0024] The treated bottom sludge is black and smelly (or malodorous) bottom sludge, and the content of organic matter and ammonia nitrogen in the bottom sludge is high, TN is higher than 10mg / g, TP is higher than 5mg / g, and DO content is lower than 0.5mg below 50cm from the water surface / L. Use conventional suction equipment to pump the bottom mud within 10cm from the surface into a uniform container with a stirring system, and at the same time add a certain amount of ferrous sulfate (10-30g / m 2 ), magnesium salt (magnesium sulfate (20~50g / m 2 ), calcium nitrate (100~150gN / m 2 ) and other passivators and polyacrylamide (0.5 ~ 5g / m 2 ), using sodium bicarbonate to adjust the pH of the bottom sludge, so that the pH value of the bottom sludge is in the range of 6-9. And stir (stirring intensity is 150-300r / min, mud residence time is 5-20min), and the bottom sludge added with passivating agent is evenly sprayed to the surface layer of the bottom sludge that has been extracted ...

Embodiment 2

[0026] What is being treated is the recent (within two months) dredged water body sediment, the content of organic matter in the sediment is low, TN is lower than 10mg / g, TP is lower than 5mg / g, and DO content is higher than 0.5mg below 50cm from the water surface / L. Use conventional suction equipment to pump the bottom mud within 10cm from the surface into a uniform container with a stirring system, and at the same time add a certain amount of iron sulfate (0.1-0.5gFe 3+ / m 2 ), magnesium hydroxide emulsion (50~100g / m 2 ), calcium nitrate (100~100gN / m 2 ) and other composite passivators and polyaluminum ferric chloride (1 ~ 5g / m 2 ). Sodium bicarbonate is used to adjust the pH of the bottom sludge so that the pH value of the bottom sludge is in the range of 6-9. And stir (stirring intensity is 150-300r / min, mud residence time is 5-20min), and the bottom sludge added with passivating agent is evenly sprayed to the surface layer of the bottom sludge that has been extracte...

Embodiment 3

[0028] What is treated is the sediment of the landscape water body, and the water body is of Class IV~V water quality. Use conventional suction equipment to pump the bottom mud within 10cm from the surface into a uniform container with a stirring system, and at the same time add a certain amount of ferrous sulfate (10-30g / m3) into the container 2 ), magnesium hydroxide emulsion (50~100g / m 2 ), calcium nitrate (100~100gN / m 2 ) and other composite passivators and polyaluminum ferric chloride (1 ~ 5g / m 2), using sodium bicarbonate to adjust the pH of the bottom sludge, so that the pH value of the bottom sludge is in the range of 6-9. And stir (stirring intensity is 150-300r / min, mud residence time is 5-20min), and the bottom sludge added with passivating agent is evenly sprayed to the surface layer of the bottom sludge that has been extracted by ordinary mud pump or sludge pump. By adding the passivating agent, the release of ammonia nitrogen in the sediment to the water body ...

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Abstract

The invention discloses a method for inhibiting release of substrate sludge nutritive salt of a eutrophic water body, which belongs to the field of controlling substrate sludge pollution. Ferric salt passivating agent, magnesium salt or magnesium hydroxide emulsion, calcium nitrate and flocculating agent are injected into the substrate sludge within 10 centimeters away from the surface layer according to the following amount respectively. The invention further adopts the technical scheme that the method comprises the following steps: extracting the substrate sludge within about 10 centimeters away from the surface layer into a container, stirring the substrate sludge during injecting the passivating agent into the substrate sludge, and spraying the substrate sludge added with the passivating agent to the extracted substrate sludge surface layer. The release amount of ammonia nitrogen in the substrate sludge to the water body is reduced by 60 to 80 percent, the release amount of total P is reduced by 70 to 85 percent, the water stable aggregates reach over 80 percent, and the passivating agent is stable and is not easy to float. By using substrate sludge extracting mixed method, the passivating agent and the substrate sludge can be fully mixed, the treatment cost is low, and large-scale application is easy to realize. The method can be applied to nutritive salt passivating treatment of the substrate sludge of the non-drinking water bodies of seriously polluted lake regions, black and smelly rivers, landscapes and the like.

Description

technical field [0001] The invention relates to a method for controlling bottom mud pollution, more specifically a method for inhibiting the release of nutrient salts from the bottom mud of eutrophic water bodies. Background technique [0002] The pollution of water body sediment and the degradation of water body aquatic vegetation is an environmental problem worldwide. Since the maintenance of a healthy urban water ecosystem is an important prerequisite for ensuring the quality of life of urban residents, research on urban water ecology issues is becoming more and more prominent. According to previous studies, when the water ecosystem degrades to a certain critical state, its recovery will encounter great resistance. Even if all exogenous pollution is eliminated, it will be difficult to restore the previous nutritional status and ecological functions. The endogenous pollution of sediment in urban slow-flowing large-water deep water bodies in plain river network areas is an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F1/52
Inventor 王国祥李时银刘燕婷倪利晓
Owner 京水(北京)生态环境治理股份有限公司
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