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Method for reducing and controlling phosphorous in bottom mud of eutrophic water

An eutrophic and sedimentary technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of large impact on the water ecosystem, high treatment cost, endogenous eutrophication pollution, etc. The effect is obvious, the effect of solving the endogenous eutrophication pollution

Active Publication Date: 2012-07-25
HANGZHOU NORMAL UNIVERSITY
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Problems solved by technology

Physical methods mainly include aeration, deep re-oxygenation, and water scour, but they generally have disadvantages such as high treatment costs and large impact on water ecosystems.
The geochemical method mainly uses passive (such as sand, clay, etc.) or active (such as calcite, zeolite, and modified materials, etc.) covering agents to control the release of endogenous phosphorus through adsorption, flocculation, and co-precipitation. Although a part of phosphorus is converted into insoluble phosphorus and permanently precipitated, with the prolongation of treatment time and the change of external conditions, a large part of phosphorus in the form of weak binding can still be released from the sediment, resulting in endogenous eutrophication Pollution

Method used

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  • Method for reducing and controlling phosphorous in bottom mud of eutrophic water
  • Method for reducing and controlling phosphorous in bottom mud of eutrophic water
  • Method for reducing and controlling phosphorous in bottom mud of eutrophic water

Examples

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Effect test

Embodiment 1

[0046] Taking the bottom mud of Hangzhou West Lake as the treatment object, the expandable dosing machine was used, and the potassium acetate aqueous solution was used alone and no treatment group was used for comparative experiments. The experiment was divided into 3 groups, group 1 was 0.051mol / L potassium acetate aqueous solution (ie salinity 5‰); group 2 was 0.102mol / L potassium acetate aqueous solution (ie salinity 10‰), group 3 was 0.153mol / L acetic acid Potassium aqueous solution (that is, salinity 15‰), each group was treated with no potassium acetate as a control.

[0047] Group 1: 0.051mol / L potassium acetate aqueous solution alone and no treatment group were used for comparative experiments. Add sediment from the West Lake to a 120cm-high, 80cm-diameter stainless steel bottom-sealed PVE pipe to 30cm, and add overlying water to 80cm to construct a simulated lake sediment-overlying water system. An expandable dosing machine is used to directly inject potassium acetat...

Embodiment 2

[0054] Taking the bottom mud of Hangzhou West Lake as the treatment object, using an expandable dosing machine, 0.085mol / L potassium acetate aqueous solution (that is, the salinity is 10‰) alone and no treatment group were used for comparative experiments. Add sediment from Hangzhou West Lake to a 120cm-high, 80cm-diameter stainless steel bottom-sealed PVE pipe to 30cm, and add overlying water to 80cm to construct a simulated lake sediment-overlying water system. An expandable dosing machine is used to directly inject a sodium acetate aqueous solution with a salinity of 10‰ into the sediment-overlying water interface through a dosing peristaltic pump. In the sodium acetate aqueous solution, the dosage of sodium acetate at the bottom mud-overlying water interface is 5.250g / m 2 , the concentration of sodium acetate aqueous solution in the dosing peristaltic pump is 0.085mol / L, and the application rate is 0.525L / m 2 , the overflow rate of sodium acetate aqueous solution at the b...

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Abstract

The invention discloses a method for reducing and controlling phosphorous in bottom mud of eutrophic water. The method includes adding salinity inhibitor aqueous liquor to a bottom mud surface of a bottom mud and overlaying water interface of the eutrophic water, hydrolyzing salinity inhibitor to form hydroxyl and metal ions, displacing out the weakly combined phosphorous in the bottom mud by means of competitive adsorption, and accordingly reducing and controlling the phosphorous in the bottom mud of the eutrophic water. The method is used for reducing and controlling the phosphorus in the bottom mud of shallow water by means of in-situ operation, the problem of endogenous eutrophic pollution brought by release of the weakly combined phosphorous in the bottom mud of the water due to poor management timeliness is thoroughly solved, management cost of the method is low, a treatment effect of the method is remarkable, the in-site operation can be realized, and the method is effective pretreatment technology for controlling the endogenous eutrophic pollution at present, and has an important and wide application prospect.

Description

(1) Technical field [0001] The invention relates to a restoration method of eutrophic water body, in particular to a method for reducing and controlling phosphorus in sediment of eutrophic water body. (2) Background technology [0002] With the improvement of people's requirements for the quality of life, the eutrophication phenomenon caused by phosphorus has gradually attracted people's attention. A large number of studies have shown that phosphorus is the most common limiting nutrient salt for water eutrophication. The increase of phosphorus not only brings The consumption of dissolved oxygen in the water body and the outbreak of algal blooms, and a series of algae toxins produced by algae during reproduction will cause greater harm to aquatic organisms and even humans. Although people have paid enough attention to the control of phosphorus, various measures have been taken to reduce the direct discharge of phosphorus and other nutrients to water bodies. However, the deve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/54
Inventor 张杭君贾秀英蔡晨晨张伟胡赐明骆可放
Owner HANGZHOU NORMAL UNIVERSITY
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