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Method for in-situ rapidly removing lake-flooding deposits

A lake flooding and fast technology, applied in the field of water environmental pollution control, can solve the problems of secondary pollution of sediment, inability to remove colloidal and granular pollutants at the same time, and recovery takes a long time, etc.

Inactive Publication Date: 2012-04-11
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the clay algae removal technology can only flocculate the settled algae, but it cannot eliminate the dissolved odor pollutants, and it cannot prevent the resuspension of the sediment, and cannot solve the subsequent secondary pollution problem. For this reason, Pan Gang etc. have successively proposed modified clay oxygenation and phosphorus fixation technology (CN200310113305.5; CN200510063410.1), and the use of nano-bubbles to restore lakes and anaerobic sediments (application number: 200910080563.5) and the method of eliminating odorous substances in a large area (application No.: 201010104189.0); it not only reduces the release of phosphorus from sediments, but also effectively improves the anaerobic environment at the water-mud interface, and plays a role in eliminating dissolved pollutants. However, both phosphorus fixation technology and nanobubble technology It is mainly aimed at anaerobic and dissolved pollutants at the water-mud interface, and cannot remove colloidal and particulate pollutants at the same time
In 2005, Pan Gang and others proposed a method to quickly remove algal blooms and convert algal blooms into submerged vegetation at the bottom of the water (CN1769198A), and applied for an international patent. Although this has improved water quality, it has prevented algal blooms from reappearing The purpose of promoting the recovery of submerged vegetation is to promote the recovery of submerged vegetation and sediment secondary pollution. However, the recovery of submerged vegetation takes a long time. From the perspective of "lake flooding" emergency, this method is still unable to solve the urgent need
Therefore, finding an economical, safe, fast and efficient technology that can remove dissolved pollutants, colloidal and particulate pollutants in the "lake flooding" in situ on a large scale, and prevent the bottom from resuspension has become an important task to deal with the "lake flooding" of Taihu Lake. Pan "emergencies and the key issues that need to be solved urgently to control the eutrophication of Taihu Lake. However, at present, there are no reports on related patented technologies at home and abroad.

Method used

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  • Method for in-situ rapidly removing lake-flooding deposits
  • Method for in-situ rapidly removing lake-flooding deposits
  • Method for in-situ rapidly removing lake-flooding deposits

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1 Experiment on the flocculation effect of natural polymer flocculants on "flooding lakes"

[0020]For the lake water taken from the "flooded lake" site of the trumpet mouth of Taihu Lake in Wuxi, 10mg / L chitosan (final concentration) was used to remove the suspended colloidal and particulate pollutants in the "flooded lake" water sample, and chitosan was added Stir immediately after sugaring for 20 minutes, the flocs settled, and the black water became clear. As shown in the figure, the water samples No. 5 and No. 6 were obviously clearer than the control water sample No. 1 after treatment, and the suspended black pollutants all turned into flocs. The solid settled to the bottom of the beaker.

Embodiment 2

[0021] Example 2 Experiment on the Effect of Nanobubbles on Removing "Flooded Lake" Dissolved Pollutants

[0022] For the on-site lake water of the trumpet mouth of Taihu Lake in Wuxi, the colloidal and particulate pollutants in the No. Sieve the clean soil along the Shiba Bay of Taihu Lake in Wuxi, make it into a suspension with clean water, expose the suspension to ozone for 30 minutes with an ozone generator, then ultrasonically for 3 minutes, and then spray the soil solution loaded with ozone nanobubbles on the In the enclosure of the floodplain area, the content changes of the dissolved pollutants dimethyl trisulfide and dimethyl isobutyl alcohol in the floodplain area before and after spraying are as follows: figure 2 As shown, the content of pollutants has decreased significantly, the removal rate of dimethyl trisulfide is greater than 75%, and the removal rate of dimethyl isobutyritol is greater than 58%.

Embodiment 3

[0023] Example 3 Natural sand inhibits resuspension effect experiment

[0024] Select the clean soil along the Shibawan coast of Wuxi Taihu Lake and the shore sand of the Yantai coast of the Yellow Sea as covering materials, dry it naturally under the sun, then crush and grind it, and pass it through a 180-mesh sieve for future use. For the lake water at the scene of flooding the lake, first flocculate the colloidal and particulate pollutants in the sedimentation water sample as described in Example 1, and then remove the dissolved pollutants in the water sample as in Example 2, and leave it for 1h After that, cover the black flocs of No. 5 and No. 6 water samples with soil and sand respectively, and spread evenly, so that the spreading thickness of the material reaches 1cm, while the black flocs of the control water samples are not covered with any material, and left to stand. After 1h, the supernatant was clarified, and then the supernatants of No. 5, No. 6 and control sampl...

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Abstract

The invention provides a method for in-situ rapidly removing lake-flooding deposits, which uses a three-step removal method and aims at the characteristic of lake-flooding deposits pollutant. In the first step, a natural polymeric flocculant is used for rapidly flocculating and depositing colloidal state and particulate form pollutant in a lake-flooding deposits water area; in the second step, a natural clay mineral is used for loading nano bubble, a dissolved pollutant in the lake-flooding deposits water area can be removed with high efficiency, and an anaerobic sludge state can be reversed; in the third step, natural sandstones are sprayed to the lake-flooding deposits water area for preventing secondary pollution caused by regeneration of pollutant and sediment. The method of the invention has the advantages of economy and safety, is capable of in-situ rapidly removing large area lake-flooding deposits with high efficiency, and can be used in emergent treatment for lakes, rivers or reservoirs.

Description

Technical field: [0001] The invention relates to a method for quickly clearing large-area lake flooding in lakes and river channels in situ by means of ecologically safe and easily biodegradable natural materials. The invention belongs to the field of water environment pollution control. Background technique [0002] "Lake flooding" (also known as black water mass or sewage mass) refers to the eutrophic water body of a lake after a large number of algae outbreaks, accumulation and death, under suitable meteorological and hydrological conditions, and the organic matter in the sediment in the anoxic and Biochemical reactions occur under anaerobic conditions, releasing sulfides, methane and dimethyl trisulfide and other sulfide substances, forming brown-black "black water masses" with foul odors, which lead to rapid deterioration of water quality and serious damage to ecosystems The phenomenon. "Lake flooding" is mainly the result of eutrophication of the water body, which is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/56
Inventor 潘纲王丹李巧霞李梁
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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