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Method for intensively removing heavy metals in sludge by utilizing electroosmosis dehydration device

A dewatering device and electro-osmosis technology, applied in dewatering/drying/concentrating sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problem of low heavy metal removal rate and unfavorable sludge resource disposal and utilization, high moisture content of mud cake

Inactive Publication Date: 2020-05-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electroosmotic dehydration technology used in the prior art has a certain removal effect on heavy metals in sludge, which reduces the content of heavy metals in dewatered cakes to a certain extent, but the removal rate of heavy metals is not high, and the sludge after sludge dehydration Problems such as high moisture content in the cake cannot effectively solve the environmental problem of secondary pollution by heavy metals in the sludge, and are not conducive to the subsequent resource disposal and utilization of the sludge

Method used

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  • Method for intensively removing heavy metals in sludge by utilizing electroosmosis dehydration device
  • Method for intensively removing heavy metals in sludge by utilizing electroosmosis dehydration device
  • Method for intensively removing heavy metals in sludge by utilizing electroosmosis dehydration device

Examples

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Effect test

Embodiment 1

[0027] Take the remaining sludge from a sewage treatment plant, measure the initial content of heavy metals zinc, nickel, arsenic, chromium, cadmium, lead, copper and mercury in the sludge, and use the electroosmotic dehydration device to dehydrate the sludge. The electroosmotic dehydration device Both the cathode and the anode in the electroosmotic dehydration device are made of ruthenium-plated iridium titanium electrodes, so that the electrodes have sufficient strength and corrosion resistance. The voltages loaded on the cathode and anode in the electroosmosis dehydration device are set to 0V, 15V, 25V, 35V, 45V, 55V respectively. , under the pressure of 0.6MPa, press filter for 60min, collect the anion and anode filtrate and mud cake, measure the concentration of each heavy metal ion in the anode and anode filtrate and mud cake, calculate the heavy metal removal rate in the sludge, the heavy metal in the sludge The calculation formula of removal rate is as follows: R=(C 0 ...

Embodiment 2

[0032] Take the remaining sludge of a sewage treatment plant, measure the initial heavy metal zinc, nickel, arsenic, chromium, cadmium, lead, copper and mercury content in the sludge, and then add sodium sulfate to the sludge to be 0g / gTSS, 0.02g / gTSS, 0.04g / gTSS, 0.07g / gTSS, 0.11g / gTSS, 0.15g / gTSS, where TSS is the concentration of total suspended solids in the sludge, at a speed of 300r / min, the stirring time is 30min, and the electroosmotic dehydration is set The bipolar voltage in the device is 55V, and under the condition of 0.6MPa, press filter for 60min, collect the anode and cathode filtrate and mud cake, measure the concentration of heavy metal ions in the anode and cathode filtrate and mud cake, and calculate the heavy metal removal in the sludge Rate.

[0033] Such as Figure 4 and 5 As shown, with the increase of the concentration of sodium sulfate added to the sludge, the heavy metal content in the filtrate of the cathode and anode both showed a trend of first ...

Embodiment 3

[0036] Take the remaining sludge of a sewage treatment plant, measure the initial heavy metal zinc, nickel, arsenic, chromium, cadmium, lead, copper and mercury content in the sludge, and then add citric acid to the sludge at 0g / gTSS, 0.02g / gTSS, 0.04g / gTSS, 0.07g / gTSS, 0.11g / gTSS, 0.15g / gTSS, where TSS is the concentration of total suspended solids in the sludge, at a speed of 300r / min, the stirring time is 30min, and the electroosmotic dehydration is set The bipolar voltage in the device is 55V. Under the condition of pressure of 0.6MPa, press filter for 60min, collect the anode and cathode filtrate and mud cake, measure the concentration of each heavy metal ion in the anode and cathode filtrate and mud cake, and calculate the sludge heavy metal removal rate.

[0037] Such as Figure 7 As shown, the content of heavy metals in cathodic filtrate increases first and then tends to be stable with the increase of citric acid dosage. When the dosage is 0.11g / gTSS, Zn, Ni, As, Cd, ...

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Abstract

The invention discloses a method for intensively removing heavy metals in sludge by using an electroosmosis dehydration device. The method for intensively removing heavy metals in sludge by using an electroosmosis dehydration device comprises the following steps of: adding a certain mass of inorganic salt or chelating agent into sludge, uniformly stirring to obtain mixed sludge, setting electroosmosis dehydration process parameters, and dehydrating the mixed sludge by using the electroosmosis dehydration device to remove the heavy metals in the mixed sludge, the chelating agent being an organic acid containing at least one carboxyl group, and being easy to chelate with heavy metals in the sludge. By adding the inorganic salt or the chelating agent into the sludge, the removal rate of heavymetals in the sludge in the electroosmotic dehydration process can be increased, meanwhile, the moisture content of a sludge cake of the dehydrated sludge is low, the effective volume reduction of the sludge is realized, and the subsequent treatment and utilization of the sludge are facilitated; the added inorganic salt does not cause secondary pollution to the sludge, and the added chelating agent is degradable and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of sludge treatment, in particular to a method for strengthening the removal of heavy metals in sludge by using an electroosmotic dehydration device. Background technique [0002] The biochemical treatment process of sewage will inevitably produce a large amount of residual sludge. Due to the complexity and diversity of sewage sources, a large amount of heavy metals and organic pollutants, pathogens, parasite eggs and other harmful substances are enriched in sludge. When the sludge with high heavy metal content is used for land use or resource disposal, the toxic heavy metals will be passed through the food chain or leaching, and eventually have a toxic effect on humans. Heavy metals in sludge restrict the subsequent resource utilization and disposal of sludge. Therefore, the development of efficient sludge harmless treatment technology is one of the core links to realize the safe disposal of sludge. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/15C02F11/00C02F101/16C02F101/20C02F101/22
CPCC02F11/15C02F11/00C02F2101/20C02F2101/22C02F2101/16
Inventor 李丹丹张伟军曹秉帝
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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