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Device and method used for restoring sludge polluted by heavy metals

A heavy metal and heavy metal precipitation technology, applied in the field of electrochemistry, can solve the problems of low treatment rate, secondary pollution, large engineering workload, etc., and achieve the effect of high repair efficiency, low cost and simple operation

Inactive Publication Date: 2011-05-25
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are a series of shortcomings in the above methods, such as large amount of engineering, high cost, low treatment rate, and secondary pollution.

Method used

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  • Device and method used for restoring sludge polluted by heavy metals
  • Device and method used for restoring sludge polluted by heavy metals
  • Device and method used for restoring sludge polluted by heavy metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1: The device for repairing heavy metal polluted sludge

[0036] Devices for remediation of heavy metal contaminated sludge, such as figure 1and 2 As shown, the device is an electrolytic cell 11, and three baffles 5 are sequentially arranged in the electrolytic cell 11, and the baffles 5 divide the electrolytic cell in sequence into: an anolyte pool 3, a sludge treatment chamber 9, a heavy metal Sedimentation tank 4, catholyte pool 10, two graphite electrodes 2 connected to power supply 1 are respectively inserted into anolyte pool 3 and catholyte pool 10, the heavy metal sedimentation pool 4 is in phase with sludge treatment chamber 9 A cation selective permeable membrane 6 is provided on the inner side of the adjacent side, and an anion selective permeable membrane 7 is provided on the opposite side of the heavy metal precipitation tank 4 to the cation selective permeable membrane 6 . The surface of the two graphite electrodes 2 is coated with an electrod...

Embodiment 2

[0038] Embodiment 2 adopts the device in embodiment 1 to repair the process of the sludge polluted by heavy metals

[0039] The sludge polluted by heavy metals is collected and sieved through a sieve with a diameter of 2mm to remove impurities and residues.

[0040] Add water to the sieved silt, according to the ratio of water to soil 3:1, make the silt in a supersaturated state, which can increase the conductivity of the silt.

[0041] Put the prepared sludge into the sludge treatment chamber 9, and add 0.025mol / L of H to the anolyte pool 3 2 SO 4 Solution is used as electrolyte, in heavy metal precipitation tank 4 and catholyte tank 10, add 0.025mol / LNa respectively 2 SO 4 Solution is used as the electrolyte, and then a graphite electrode 2 connected to the power supply 1 is respectively inserted in the anolyte pool 3 and the catholyte pool 10, and the DC power supply is switched on, and a constant DC voltage of 25V is desirable. During the power-on process, the electrol...

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Abstract

The invention discloses a device used for restoring the sludge polluted by heavy metals and a use method thereof. The device is an electrolytic cell (11), wherein the inside of the electrolytic cell (11) is provided with three baffles (5); the electrolytic cell is divided into an anolyte tank (3), a sludge treatment chamber (9), a heavy metal setting tank (4) and a catholyte tank (10) in sequence by the baffles (5); two graphite electrodes connected with a power supply (1) are separately inserted in the anolyte tank (3) and the catholyte tank (10); the inside of the side next to the sludge treatment chamber (9), of the heavy metal setting tank (4) is provided with a cation exchange membrane (6); and the side opposite to the cation exchange membrane (6) is provided with an anion exchange membrane (7). By adopting the device and method of the invention for restoring sludge, the efficiency is high, the operation is simple, the cost is low and most of heavy metals in sludge can be removed.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a device for repairing heavy metal polluted sludge and an application method thereof. Background technique [0002] In recent years, with the development of society and urban construction, the problem of heavy metal pollution has become increasingly prominent. A large number of industrial discharges will undoubtedly cause huge pollution to our originally clean land; in addition, a large amount of untreated human domestic waste will continue to pollute the surrounding environment. [0003] Soil heavy metal pollution harms the environment mainly in the following ways: ①The contaminated soil is directly exposed to the environment, and can be directly or indirectly absorbed by animals or humans through soil particles and other forms; ②Through the leaching of rainwater, the Heavy metals permeate slowly downward, which may lead to groundwater pollution. ③ Changes in externa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
Inventor 孟庆祥殷德顺游波樊舒婕娄保东
Owner HOHAI UNIV
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