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A method and integrated device for in-situ electrochemical oxidation-reduction conditioning sludge

An in-situ electrochemical and sludge technology, applied in electrochemical sludge treatment, chemical instruments and methods, sludge treatment, etc., can solve problems such as reducing sludge conditioning effect, achieve simple operation, good conditioning effect, improve effect of effect

Active Publication Date: 2021-07-13
北京中持净水材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the electrochemical oxidation of electron loss is bound to be accompanied by the reduction process of electron gain. If the reduction process is in the same reactor, the sludge conditioning effect will be significantly reduced.

Method used

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  • A method and integrated device for in-situ electrochemical oxidation-reduction conditioning sludge

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Effect test

Embodiment 1

[0037] The remaining sludge in the secondary sedimentation tank of a sewage treatment plant in Jinhua City has a moisture content of 98.1% and a pH value of 7.6. The sludge is placed in the sludge tank area of ​​the electrochemical in-situ electrochemical oxidation-reduction reactor, and hydrochloric acid is added. Adjust the pH to 6.8. Prepare a 10mol / L calcium chlorate solution, and add the calcium chlorate solution to the sludge tank under sufficient stirring conditions to make the molar concentration 3mmol / gVSS. Turn on the power and react under stirring conditions for 30 minutes; turn off the power and add 50 mg / L of polyacrylamide and react under stirring conditions of 100 rpm for 3 minutes; then react under stirring conditions of 50 rpm for 15 minutes. The conditioned sludge is transported to a belt filter press for dehydration, and the moisture content of the mud cake is 59.7%.

Embodiment 2

[0039] Sludge from a printing and dyeing factory in Suzhou City has a moisture content of 97.3% and a pH value of 5.7. The sludge is placed in the sludge tank of an electrochemical in-situ electrochemical oxidation-reduction reactor. Prepare a mixed solution of 6mol / L sodium chlorate and potassium manganate, wherein the molar ratio of sodium chlorate and potassium manganate is 3:1, and add sodium chlorate and manganic acid into the sludge tank under sufficient stirring conditions Potassium mixed solution, so that its molar concentration is 2mmol / g VSS. Turn on the power and react under stirring conditions for 20 minutes; turn off the power, add polyacrylamide 75 mg / L, react under stirring conditions of 120 rpm for 3 minutes; then react under stirring conditions of 40 rpm for 20 minutes. The conditioned sludge is transported to a plate and frame filter press for dehydration, and the moisture content of the mud cake is 56.2%.

Embodiment 3

[0041]The remaining sludge in the secondary sedimentation tank of a sewage treatment plant in Cangzhou City, the sludge moisture content is 98.9%, and the pH value is 7.2. The sludge is placed in the sludge tank area of ​​the electrochemical in-situ electrochemical oxidation-reduction reactor, and sulfuric acid is added. Adjust the pH to 6.5. Prepare a mixed solution of 7mol / L magnesium chlorate and calcium chlorite, wherein the molar ratio of magnesium chlorate and calcium chlorite is 1:1, and under sufficient stirring conditions, add magnesium chlorate and calcium chlorite to the sludge tank The mixed solution of calcium chlorite has a molar concentration of 4mmol / g VSS. Turn on the power, and react for 50 minutes under stirring conditions; turn off the power, add 250 mg / L polyacrylamide, and react for 4 minutes under stirring conditions of 80 rpm; then react for 30 minutes under stirring conditions of 50 rpm. The conditioned sludge is transported to a stacked screw centrif...

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Abstract

The invention relates to an in-situ electrochemical oxidation-reduction sludge conditioning method and an integrated device. The method utilizes the characteristics of electrochemical electron transfer and balance, and utilizes the electrochemical reduction of the cathode while performing electrochemical oxidation at the anode Function Convert inert oxidizing species (such as chlorate, chlorite, manganate, etc.) into active species (such as sodium hypochlorite, manganese dioxide, manganese, etc.) in situ to further oxidize while avoiding sludge generation Reduction reaction, improve electrochemical oxidation efficiency. The present invention also provides an integrated device for realizing the above process. The method and device of the invention are suitable for the conditioning of municipal sludge and industrial sludge with high organic matter content.

Description

technical field [0001] The invention relates to a sludge treatment process, in particular to a method for conditioning sludge by using an in-situ electrochemical oxidation-reduction method, especially for sludge produced by enterprises such as municipal sludge and industrial sludge with high organic matter Dealing with technical fields. Background technique [0002] A large amount of excess sludge is produced during the operation of urban sewage treatment plants. Scientific, reasonable and effective disposal of sludge is the basis for ensuring the effectiveness of sewage treatment plants and avoiding secondary pollution. The traditional sludge disposal method is landfill, but with the expansion of the city and the increase in the cost of urban land, the recycling of sludge such as composting and biogas production or the co-processing of cement kilns has gradually shown a tendency to replace landfill. . In addition, even for landfill disposal, reducing the moisture content ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/122C02F11/123C02F11/127
CPCC02F11/006C02F11/122C02F11/123C02F11/125C02F11/127
Inventor 康勇锋邵凯
Owner 北京中持净水材料技术有限公司
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