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In-situ restoring method for eutrophic water sediments

A technology of eutrophication and in-situ remediation, applied in the directions of oxidized water/sewage treatment, oxidized sludge, etc., can solve the problem that in-situ covering technology is susceptible to biological agitation, municipal management and residents' life, pollutants The problem of increasing release and other issues can achieve the effect of stable and long-lasting governance effect, low requirements for personnel and mechanical equipment, and quick effect.

Inactive Publication Date: 2010-09-15
HANGZHOU NORMAL UNIVERSITY
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  • Description
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Problems solved by technology

Environmental protection dredging technology is the earliest and relatively mature technology, but it has slow and cumbersome engineering progress, which affects normal municipal management and residents' lives. If the dredging depth is not well determined and the dredging is too shallow, pollutants will be released after dredging increase and other disadvantages, while the in-situ covering technology is susceptible to the influence of biological agitation and other disadvantages

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  • In-situ restoring method for eutrophic water sediments
  • In-situ restoring method for eutrophic water sediments
  • In-situ restoring method for eutrophic water sediments

Examples

Experimental program
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Embodiment 1

[0033] Taking Hangzhou West Lake sediment as the treatment object, a comparative experiment was carried out with ozone alone aeration, calcium hydroxide alone, ozone and calcium hydroxide solution combined aeration and no treatment group.

[0034] Add the bottom mud sediment from the West Lake to an opaque and bottom-sealed PVC pipe with a height of 120 cm and a diameter of 80 cm. The mud filling height is 30 cm and the height of the overlying water is 50 cm to construct a simulated lake bottom mud-overlying water system. An integrated machine for aeration and dosing is adopted, ozone is provided by an ozone generator, and calcium hydroxide solution is provided by a dosing pump. The composite aeration head is adopted, when the ozone and calcium hydroxide are compounded, the ozone and calcium hydroxide solution escape from the aeration head at the same time, and act on the sediment-overlying water interface that needs to be treated. The ozone aeration rate is 10g / min, and the o...

Embodiment 2

[0041] Taking the sediment of Jianhu Lake in Shaoxing as the processing object, add the bottom mud sediment from Jianhu Lake to an opaque PVC pipe with a height of 120cm and a diameter of 80cm and a bottom seal. The height of the mud filling is 30cm and the height of the overlying water is 50cm. Lake sediment-overlying water system. An integrated machine for aeration and dosing is adopted, ozone is provided by an ozone generator, and calcium hydroxide solution is provided by a dosing pump. Ozone and calcium hydroxide compound and act on the sediment-overlying water interface that needs to be treated. The ozone aeration rate is 6g / min, and the ozone aeration time is 2 hours. The concentration of calcium hydroxide solution in the dosing pump is 0.02mol / L, and the dosage is 200mL / m 2 For sediment, calcium hydroxide solution escapes through the composite aeration head at a rate of 10mL / min.

[0042] Detection method: Phosphate is determined by molybdenum antimony anti-spectropho...

Embodiment 3

[0045] Taking the sediment of Jianhu Lake in Shaoxing as the processing object, add the bottom mud sediment from Jianhu Lake to an opaque PVC pipe with a height of 120cm and a diameter of 80cm and a bottom seal. The height of the mud filling is 30cm and the height of the overlying water is 50cm. Lake sediment-overlying water system. An integrated machine for aeration and dosing is adopted, ozone is provided by an ozone generator, and calcium hydroxide solution is provided by a dosing pump. Ozone and calcium hydroxide compound and act on the sediment-overlying water interface that needs to be treated. The ozone aeration rate is 8g / min, and the ozone aeration time is 3 hours. The concentration of calcium hydroxide solution in the dosing pump is 0.02mol / L, and the dosage is 300mL / m 2 For sediment, calcium hydroxide solution escapes through the composite aeration head at a rate of 10mL / min.

[0046] Detection method: Phosphate is determined by molybdenum antimony anti-spectropho...

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Abstract

The invention discloses an in-situ restoring method for eutrophic water sediments. The method comprises the following steps that: the ozone and the calcium hydroxide solution act on a sediment-overlying water interface of sediments; by utilizing the strong oxidizing environment formed by the ozone, phosphorus nutrient salt released from the sediment-overlying water interface quickly reacts with deactivator calcium hydroxide to generate fixation reaction; a film is formed at the sediment-overlying water interface to further prevent the sediment from releasing the phosphorus nutrient salt to overlying water; and thus, the in-situ restoring of the eutrophic water sediments is achieved. Compared with the prior art, the invention has the advantages of low construction cost, quick effect, obvious sediment restoring effect, stable and lasting control effect, convenient operation, and low requirement on personnel and mechanical equipment and is favorable for wide popularization of the method.

Description

(1) Technical field [0001] The invention relates to a restoration method for water body pollution, in particular to an in-situ restoration method for eutrophic water body sediments. (2) Background technology [0002] Eutrophication of water body is one of the difficult problems in water pollution control in the world today. Over the past 30 years, due to the development of social economy and the impact of human activities, a large number of exogenous pollutants have entered lakes and deposited in sediments, causing serious pollution to the bottom of most lakes in my country. According to the survey results in recent years, many lakes, especially urban lakes, are seriously polluted. For example, the total phosphorus content in the sediments of many waters such as Taihu Lake, Dianchi Lake, and Chaohu Lake is as high as 3000-4000mg / kg. Sediment is an important place in the biochemical cycle of phosphorus in fresh water. There is a dynamic balance between sedimentation, adsorpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/08C02F1/78
Inventor 张杭君贾秀英胡赐明夏晗婷曹静
Owner HANGZHOU NORMAL UNIVERSITY
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