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Active covering method for in-situ remediation of sediments

An in-situ restoration and sediment technology, applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc., can solve the problems of weak complex pollution treatment ability, unfriendly environment, and reduction of effective storage capacity, etc. To achieve the effect of reducing water storage capacity, low cost and easy access

Inactive Publication Date: 2014-03-05
NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems that the existing in-situ covering technology has weak ability to deal with complex pollution, is vulnerable to damage, is not environmentally friendly and reduces effective storage capacity, and provides an active covering technology for in-situ repair of sediments. override method

Method used

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  • Active covering method for in-situ remediation of sediments

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specific Embodiment approach 1

[0021] Embodiment 1: The active covering method for in-situ restoration of deposits is as follows:

[0022] 1. Selection of in-situ covering materials: selection of ferrihydrite, calcite, geotextile and local river sand;

[0023] 2. Pretreatment of in-situ covering materials: Ferrihydrite is crushed and passed through a 200-mesh sieve, washed for later use; calcite is crushed and passed through a 40-mesh sieve, washed for later use; geotextiles are washed for later use; local river sand is washed for later use ;

[0024] Three, the ferrihydrite powder pretreated in step 2 is evenly sprinkled into the water body and covered on the sediment at the bottom of the water body, and the average thickness of the ferrihydrite powder layer covered on the sediment is 5mm;

[0025] Four, step 2 pretreated calcite sand is evenly sprinkled into the water body and covered on the ferrihydrite powder layer, and the average thickness of the calcite sand layer covered on the ferrihydrite powder ...

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that the geotextile described in step 1 is polyester non-woven fabric. Others are the same as in the first embodiment.

[0029] Adopt following experiment verification effect of the present invention:

[0030] Take the sediment cores of a representative temperate eutrophic shallow lake in southeastern Australia, use the method of specific embodiment 1 to cover 3 sediment cores as the treatment group, and take 3 untreated sediment cores as the control group, and continuously The content of total phosphorus and total nitrogen in the water body was monitored in real time for 15 days.

[0031] The results showed that the total phosphorus content of the water body in the treatment group has been gradually decreasing, from (0.23±0.06) mg / L to (0.06±0.03) mg / L, while the total phosphorus content of the control group has been fluctuating, with an average content of (0.23±0.05)mg / L. After calculation, the total phosph...

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Abstract

The invention discloses an active covering method for the in-situ remediation of sediments, relates to an active covering method for carrying out in-situ remediation on contaminated sediments, and is designed for solving the technical problem that an existing in-situ covering technology has a poor treatment capacity on combined pollutions due to thick covering. The method comprises the following steps: uniformly scattering pretreated ferrihydrite powder in a water body, so that the pretreated ferrihydrite powder is covered on sediments at the bottom of the water body; uniformly scattering pretreated calcite sand in the water body, so that the calcite sand is covered on the ferrihydrite powder layer; submerging pretreated geotechnical cloth in the bottom of the water body, so that the geotechnical cloth is uniformly covered on the calcite sand layer; uniformly scattering pretreated local river sand in the water body, so that the local river sand is covered on the geotechnical cloth. Ferrihydrite, calcite and local river sand used in the method are all natural materials, easy to obtain, and low in cost; the geotechnical cloth is pollution-free and low in cost, therefore, the method is technically economical and feasible. The invention belongs to the field of in-situ remediation of sediments.

Description

technical field [0001] The invention relates to an active covering method for in-situ restoration of polluted deposits. Background technique [0002] The control of water body eutrophication must reduce the release of endogenous nutrient salts. There are two main types of pollution sediment control technologies at home and abroad: in-situ treatment technology and ex-situ treatment technology. Among them, the principle of in-situ covering technology is to use physical, chemical or biological methods to cover one or more layers of materials on the surface of contaminated sediments to separate the sediments from the water body, thereby preventing the release of pollutants into the water body. [0003] The development of in-situ covering technology has gone through three stages: natural materials, modified clay materials and active materials. As an emerging sediment remediation technology, compared with traditional controlled natural restoration and ex-situ treatment technologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 邹元春于晓菲佟守正姜明吕宪国王国平
Owner NORTHEAST INST OF GEOGRAPHY & AGRIECOLOGY C A S
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