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Heavy metal polluted sludge treatment method

A treatment method and heavy metal technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/concentrated sludge treatment, etc., can solve heavy metal secondary pollution, low direct dehydration efficiency of geotextile bag, mechanical dehydration Problems such as high equipment investment and operating costs, low equipment investment and operating costs, avoiding health hazards for construction personnel, and simple processes

Active Publication Date: 2010-04-14
TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a treatment method for heavy metal-contaminated sludge in rivers, lakes, reservoirs, etc., to prevent the sludge from dredging to the greatest extent through environmental protection dredging Secondary pollution caused by disturbance; conveying through closed pipelines to ensure that the dredged sludge will not leak before entering the bag and causing secondary pollution of heavy metals; adding heavy metal chelating stabilizers to ensure that the heavy metals in the sludge are dehydrated before entering the geotextile bag It has been chelated and stabilized before, and will not cause secondary pollution to the surrounding environment; replacing mechanical dehydration with geotextile bag dehydration saves equipment investment and operating costs; the dehydration effect of geotextile bag is strengthened by adding sludge flocculation conditioner, so , this method focuses on solving the problem of secondary pollution of heavy metals in the whole treatment process from dredging to dehydration and volume reduction, high investment and operation costs of mechanical dehydration equipment, low efficiency of direct dehydration with geotextile bags, matching of dredging to dehydration and volume reduction, etc.

Method used

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  • Heavy metal polluted sludge treatment method

Examples

Experimental program
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Embodiment 1

[0010] Embodiment 1: Adopt Dutch IHC Beaver 1200 type environmental protection dredging ship to carry out environmental protection dredging to the sludge polluted by heavy metals such as mercury, copper, cadmium in the Hangu sewage reservoir (contaminated sludge heavy metal content is as shown in Table 1), and the dredging flow rate is 400m 3 / h, the average moisture content of dredged silt is 91%. Use a metering pump to pump ES heavy metal chelating agent (Tianjin Yiming) into the first serpentine pipeline mixer, and the dosing flow rate is 200kg / h (equivalent dosage is about 5‰, calculated as dry sludge , weight ratio), the stable reaction time of the chelating agent is at least 1min. Use a metering pump to pump a cationic polyacrylamide flocculant solution (Jiangsu Nantian CSG-A20) with a concentration of 5‰ (weight ratio) into the second serpentine pipeline mixer, and add a flow rate of 40kg solid powder flocculant / h (the equivalent dosage is about 1.1‰, based on dry slu...

Embodiment 2

[0015]Embodiment 2: The implementation method is the same as that of Embodiment 1, and the content of heavy metals in the polluted sludge is changed, as shown in Table 3. Change the dosage flow of ES heavy metal chelating agent to 100kg / h (equivalent dosage is about 2.5‰, based on dry sludge, weight ratio). After the geotextile bag was filled and dehydrated and consolidated for 10 days, the average moisture content of the dewatered sludge in the bag was 54%. Refer to "Sludge Disposal of Urban Sewage Treatment Plants for Land Improvement of Mud Quality" (CJ / T 291), that is, the treated sludge contaminated with heavy metals such as mercury, copper, and cadmium can be used for land use.

[0016] Table 3 Heavy metal content in polluted sludge Unit: mg / kg

[0017] project

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Abstract

The invention discloses a heavy metal polluted sludge treatment method which comprises the following steps: conveying heavy metal polluted bottom sludge of rivers, lakes and reservoirs by a slurry pump of a sanddredger ashore; adding heavy metal chelate stabilizer in a first pipeline blender of dredging pipelines; and then adding flocculant in a second pipeline blender; and finally filling sludge in geotextile bags for volume reduction and dehydration; and concreting for 7-50 days after the sludge filling, wherein the sludge treated by the method can be used for land reclamation, greening or landfilling according to different water contents and heavy metal contents. Compared with the prior art, by environmental-protection dredging, transmission by closed pipelines and heavy metal stabilization, the invention completely solves the secondary solution problem of heavy metals; and the invention combines the heavy metal stabilization and a geotextile bag dehydration technology without power consumption without the input of mechanical dehydration equipment, and is suitable for heavy metal polluted sludge treatment in occasions of large treatment area, short work period, small dehydration site, less once investment, low operation cost and the like.

Description

technical field [0001] The invention belongs to the technical field of treating heavy metal-polluted sludge from rivers, lakes, reservoirs, etc., and in particular relates to a treatment method for dredging, dehydration and capacity reduction of heavy-metal-polluted sludge and heavy metal stabilization. Background technique [0002] In recent years, with the improvement of my country's industrial manufacturing and mineral mining and refining capacity, a large amount of heavy metal wastewater and waste residues have been directly discharged into the environment without treatment, making the problem of heavy metal pollution increasingly prominent, especially the heavy metal pollution incident in 2009 Frequent incidents, such as large-scale blood lead excess incidents in Shaanxi, Hunan and other places, heavy metal pollution in the Xiangjiang River made many river sections around it unsuitable for human habitation, etc. For rivers, lakes, reservoirs, etc. polluted by industrial ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/14C02F101/22C02F101/20
Inventor 张景辉刘朝辉西伟力王旭东张曙光高建东王文茜董晶毕涛
Owner TIANJIN ECOLOGY CITY ENVIRONMENTAL PROTECTION
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