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Rapid heavy metal-contaminated slurry dewatering system and method for rapid heavy metal-contaminated slurry dewatering

A heavy metal sludge and rapid dehydration technology, which is applied in dehydration/drying/thickened sludge treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problem of reducing dehydration effect, unfavorable particle compression, long dehydration cycle, etc. problems, to achieve the effect of improving dehydration effect, improving dehydration performance, and low moisture content of mud cake

Inactive Publication Date: 2018-07-13
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method also has the following essential defects in the actual treatment process: 1) it has adopted high-strength, long-time ultrasonic treatment, which can completely destroy the sludge floc particles and the bacterial micelle structure, and the sludge particle size is reduced to In the order of more than ten microns, the specific surface area of ​​sludge particles increases, and the adsorption capacity of water increases, which is not conducive to the compression between particles, but reduces the dehydration performance of sludge, and the treatment cost is high
2) The heavy metals in the sludge cannot be effectively treated, and the dehydrated sludge and filtrate need to be further disposed of
4) The treatment sequence of first flocculation and then ultrasonic treatment will reduce the adsorption amount of flocculants to sludge particles and reduce the dehydration effect, and ultrasonic treatment of flocculated sludge will destroy the floc structure and affect the sludge dehydration properties. Deterioration of supernatant water quality
5) During the dehydration process of the geotechnical tube bag, the separation of mud and water is achieved only by gravity and pumping pressure, and the dehydration cycle is long

Method used

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  • Rapid heavy metal-contaminated slurry dewatering system and method for rapid heavy metal-contaminated slurry dewatering

Examples

Experimental program
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Effect test

Embodiment 1

[0050] The heavy metal contaminated soil left over from a chemical plant in Hengyang City was treated with the leaching method to produce mud with a moisture content of 98%. The mud was enriched with heavy metals leached from the soil, mainly cadmium (Cd), lead (Pb), Zinc (Zn), Arsenic (As). Add lime to the sludge temporary storage tank to adjust the pH to 9, then send the mud into the ultrasonic reaction device, the ultrasonic generator does not start (that is, no ultrasonic action is applied), and then pump it into the flocculation reaction device, and add 10 to the flocculation tank respectively. % of polyferric sulfate and 5‰ (mass ratio, sludge dry weight) cationic polyacrylamide, stir evenly and then pump into the sludge dewatering device, stop filling after the geotechnical tube bag is filled, and wait until the moisture in the sludge After flowing out, leave a space on the upper part of the geotechnical tube bag and continue filling, repeat filling 4 to 6 times until c...

Embodiment 2

[0052] The implementation method is the same as in Example 1, the ultrasonic generator is turned on, and the ultrasonic wave with a frequency range of 28kHz and a sound energy density of 0.1W / mL is applied for 6s. Change the flocculant addition to 5% polyferric sulfate and 2‰ (mass ratio, sludge dry weight) cationic polyacrylamide. The sludge was dehydrated in geotube bags for 10 days, with an average moisture content of 48%.

Embodiment 3

[0054] The implementation method is the same as in Example 2, but the sequence of ultrasonic wave and flocculation is changed. After the sludge is adjusted to pH 9, it first enters the flocculation reaction device, and 5% polyferric sulfate and cations of 2‰ (mass ratio, sludge dry weight) are added. Type polyacrylamide, and then subjected to ultrasonic waves with a frequency range of 28kHz and a sound energy density of 0.1W / mL for 6s. The sludge is dehydrated in geotube bags for 10 days with an average moisture content of 55%.

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Abstract

The invention discloses a rapid heavy metal-contaminated slurry dewatering system and a method for rapid heavy metal-contaminated slurry dewatering. The dewatering system comprises a temporary sludgestorage tank, an ultrasonic reaction device, a flocculation reaction device and a sludge dewatering device. The method for dewatering heavy metal-contaminated slurry by the dewatering system comprisesthe following steps: adjusting the pH of heavy metal-contaminated sludge in the temporary sludge storage tank, then conveying into the ultrasonic reaction device for ultrasonic treatment, then entering the flocculation reaction device for a flocculation reaction, and finally entering a geotextile tubular bag of the dewatering device for sludge and water separation. The whole dewatering system isshort in heavy metal-contaminated sludge treatment cycle and small in using amount of a flocculating agent; heavy metals can be stabilized while the sludge is dewatered; final disposal or recycling can be directly performed on the dewatered sludge.

Description

technical field [0001] The invention relates to a treatment method for stabilization and reduction of heavy metal sludge, in particular to a method for rapid stabilization and reduction of heavy metal sludge by combining ultrasonic pretreatment, flocculation treatment and geotechnical tube bag dehydration treatment, which belongs to heavy metal sludge Dealing with technical fields. Background technique [0002] In recent years, with the acceleration of the industrialization process, especially the improvement of my country's industrial manufacturing and mineral mining and refining capacity, a large amount of heavy metal wastewater and waste residues are directly discharged into the environment without treatment, making the problem of heavy metal pollution increasingly prominent. According to the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources in 2014, the overall situation of the nati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/12C02F11/14C02F101/20
CPCC02F11/00C02F11/121C02F11/14C02F2101/20
Inventor 田宝虎史学峰李昌武韩宝禄邵乐韩凤
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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