Emergency restoring process for pollution of water body, substrate sludge and mud flat by heavy metal

An emergency repair and heavy metal technology, which is applied in the direction of water pollutants, water/sewage treatment, flotation water/sewage treatment, etc., can solve the problems of secondary pollution, the limitation of the living environment of the applicable range of organisms, and the slow treatment of bioremediation. Achieve the effects of avoiding slow processing, reducing costs, and solving secondary pollution

Inactive Publication Date: 2010-07-28
QUANZHOU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide an emergency repair process for heavy metal-contaminated water bodies, sediments and tidal flats, so as to facilitate large-scale in-situ emergency repairs and avoid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 20g of copper sulfate and sampled turbid muddy river water were prepared to simulate 1000L of heavy metal-polluted water, which was left for 72 hours for later use. There was a thicker mud layer in the lower part of the water to simulate sediment. After filtering, the free copper content in the water was measured to be about 2 mg / l. The copper content in the suspension is about 61mg / l, and the copper content in the bottom mud is 135mg / l.

[0030] Use a vortex oscillator and place a plastic bag in the water for vibration. First, add 100 grams of citric acid to the water body and store it for 24 hours, so that the copper ions adsorbed on the suspended impurities in the water body and the sediment are converted into citric acid complexed copper ions and enter the water. . Add the aqueous dispersion of rock wool fiber 0.05-0.1% (water gross weight) then, drop into Na3T-15 (a kind of heavy metal scavenger, South Korea Haruno Chemical Co., Ltd. production) according to the a...

Embodiment 2

[0037] Use 6g of lead sulfate and turbid seawater to simulate 1000L of heavy metal-polluted water. Use the fish tank air pump to maintain the aeration state and store it for 72 hours. After filtering, the free lead content in the water is about 2.3mg / l, and the lead in the suspended matter is 35mg / l , the sediment lead content is about 17g / l.

[0038] Put 100g of EDTA into the water body, stir for 0.5h to dissolve and store for 24 hours, then add 0.2% aluminum silicate glass fiber, and then drop in excess copper reagent (heavy metal scavenger) (C 5 h 10 NaS 2 ·3H 2 O) Transform the complexed lead into a white suspension. After 30 minutes, directly add 0.5% brine by weight in seawater, get cation PAM0.02% and disperse it with water in advance, and put it into water. Then use lime to adjust the pH to 11 (this embodiment also can use iron salt and aluminum salt, use iron salt or aluminum salt and do not need to adjust the pH value with lime). At this time, a large amount of m...

Embodiment 3

[0042] In a tidal flat mud sample in Kanjiang, Quanzhou Bay, the copper content was measured to be 331mg / l, the lead content was 35mg / l, and the sulfur ion was 217mg / l. For the beach with an area of ​​3*3 meters, insert plastic film and sticks into the beach mud to enclose it as the repair range.

[0043] First step on a hole in the tidal mud layer, the depth of the hole is about 30cm, and the hole area is about 200cm 2 , about 9 holes per square meter. Put seawater into the surrounding area to make it submerge about 10cm of tidal flats, add 2 kg of hydrogen peroxide in batches to oxidize sulfur ions in the sludge. After soaking for 0.5 hours, the bubbles basically disappeared, and at this time, the liquid medicine was injected. The liquid medicine consumption, kind and operation are identical with embodiment 2 except that bracket content. (Do not stir after the EDTA solution is added, and only keep it for 2 hours before starting to add the copper reagent)

[0044] After t...

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PUM

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Abstract

The invention discloses an emergency restoring process for pollution of a water body, substrate sludge and a mud flat by heavy metal. A complex agent is first added to the water body, and most heavy metal ions in ionized and absorbed states are converted into dissolved complex ions; short fibers and a heavy metal capturing agent are added to the water body so as to convert the heavy metal complex ions into suspended matters, and then a flocculating agent is added to flocculate the suspended matters; a flocculation assisting agent is added to the water body to form a fiber enhanced flocculating body; an Mg/magnetic composite material prepared by magnetic substances and magnesium powder in advance is thrown into the water body so as to lead the fiber enhanced flocculating body to capture air bubbles and float to the water surface; finally, the fiber enhanced flocculating body is captured to carry out emergency restoration. The emergency restoring process is convenient for in-situ emergency restoration of the stormy wavy water body in a large scale, so as to avoid the disadvantages that the present biological restoring method leads to slow treatment and is limited by the biological living environment in the aspect of the application range, thereby not only solving the problem of secondary sedimentation pollution caused by the present chemical restoring method, but also solving the bottleneck problem that the present dissolved air floatation process cannot carry out entire water-area pipe laying operation.

Description

technical field [0001] The invention relates to an emergency restoration process for heavy metal polluted water bodies, bottom mud and tidal flats. technical background [0002] Heavy metals, especially mercury, cadmium, lead, chromium, etc. have significant and biological toxicity. They cannot be degraded by microorganisms in the water body, but can only undergo the process of mutual transformation, dispersion and enrichment of various forms (ie migration). The characteristics of heavy metal pollution are: (1) A small part dissolves in water, and most of them, except those taken away by suspended matter, will be enriched in the bottom mud near the sewage outlet due to adsorption, precipitation, hydrolysis, etc., and become long-term secondary pollutants. source of pollution. (2) Various inorganic ligands (chloride ions, sulfate ions, hydroxide ions, etc.) and organic ligands (humic substances, etc.) in water will form complexes or chelates with them, resulting in heavy me...

Claims

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Application Information

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IPC IPC(8): C02F1/62C02F1/52C02F1/28C02F1/24C02F101/20
Inventor 陈楷翰袁建军吕凤娇杨清乐雷少钦王铃铃
Owner QUANZHOU NORMAL UNIV
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