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A kind of reuse method of municipal sewage treatment plant sludge

A municipal sewage and treatment plant technology, applied in the field of waste material recycling, can solve problems such as difficulty in sludge disposal and treatment, secondary environmental pollution, etc., and achieve the effects of good water seepage performance, improved water permeability, and high strength

Active Publication Date: 2018-01-30
ZHEJIANG JIRUI CONSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the huge amount, the stacking and disposal of sludge will cause secondary pollution to the environment, so the disposal of sludge is facing great difficulties
The main disposal methods of sludge at home and abroad include landfill, throwing into the sea, incineration, composting, etc., but these methods have certain limitations in practical application

Method used

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  • A kind of reuse method of municipal sewage treatment plant sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] In the first step, add 5wt% sulfuric acid to the sludge to adjust the pH to 2-3;

[0026] In step 2, Fe is added to the sludge obtained in step 1 3+ Make the concentration 0.4g / L, after stirring evenly, carry out electrolysis in the electrolytic cell, the voltage range of electrolysis is 20V, the electrolysis time is 4h, after carrying out solid-liquid separation again, obtain solid matter;

[0027] Step 3, mix the solid matter and water evenly according to the weight ratio of 1:0.6, and after drying, grind it into fine powder, the mesh number of fine powder is 200-400 mesh;

[0028] In step 4, the fine powder obtained in step 3 is fired in a high-temperature furnace at a temperature of 1200°C for 30 minutes to obtain a sintered powder;

[0029] Step 5, in parts by weight, mix 10 parts of sintered powder, 10 parts of potassium titanate whiskers, and 100 parts of water evenly, then add 4 parts of zinc sulfate and 3 parts of sodium aluminate, and then heat the reaction a...

Embodiment 2

[0032] In the first step, add 20wt% sulfuric acid to the sludge to adjust the pH to 2-3;

[0033] In step 2, Fe is added to the sludge obtained in step 1 3+ Make the concentration 0.7g / L, stir evenly, carry out electrolysis in the electrolytic cell, the voltage range of electrolysis is 50V, electrolysis time is 7h, after carrying out solid-liquid separation again, obtain solid matter;

[0034] In the third step, the solid matter and water are mixed evenly according to the weight ratio of 1:0.9, and after drying, they are crushed into fine powder, and the mesh number of the fine powder is 200-400 mesh;

[0035] In step 4, the fine powder obtained in step 3 is fired in a high-temperature furnace at a temperature of 1250°C for 35 minutes to obtain a sintered powder;

[0036] Step 5, in parts by weight, mix 20 parts of sintered powder, 15 parts of potassium titanate whiskers, and 160 parts of water evenly, then add 6 parts of zinc sulfate and 5 parts of sodium aluminate, and then...

Embodiment 3

[0039] Step 1, add 10wt% sulfuric acid to the sludge to adjust the pH to 2-3;

[0040] In step 2, Fe is added to the sludge obtained in step 1 3+ Make the concentration 0.5g / L, stir evenly, carry out electrolysis in the electrolytic cell, the voltage range of electrolysis is 40V, electrolysis time is 5h, after carrying out solid-liquid separation again, obtain solid matter;

[0041] Step 3, mix the solid matter and water evenly according to the weight ratio of 1:0.7, and after drying, grind it into fine powder, the mesh number of fine powder is 200-400 mesh;

[0042]In step 4, the fine powder obtained in step 3 is fired in a high-temperature furnace at a temperature of 1220°C for 32 minutes to obtain a sintered powder;

[0043] Step 5, in parts by weight, mix 15 parts of sintered powder, 12 parts of potassium titanate whiskers, and 120 parts of water evenly, then add 5 parts of zinc sulfate and 4 parts of sodium aluminate, and then heat the reaction at 70°C After 2 hours, ad...

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Abstract

The invention relates to a re-utilizing method of sludge in a municipal sewage treatment plant and belongs to the technical field of waste material recycling.The re-utilizing method includes: adding inorganic acid into the sludge to adjust pH to be acidic; adding Fe3+, stirring well, electrolyzing, and performing solid-liquid separation to obtain solid substance; well mixing the solid substance with water, drying, and smashing a mixture into fine powder; sintering the fine powder in a high-temperature furnace to obtain sintered powder; well mixing the sintered powder, potassium titanate whisker and water, adding zinc salt and sodium aluminate, heating, curing, filtering, and drying particles to obtain powder coated by an inorganic compound; well mixing the inorganic compound with other aggregate, and performing ball milling, press-forming and firing.Water-permeable bricks prepared by the method have the advantages of high water permeability and high strength.

Description

technical field [0001] The invention relates to a method for reusing sludge from a municipal sewage treatment plant, and belongs to the technical field of recycling waste materials. Background technique [0002] Municipal sludge is a solid sediment produced in the process of sewage treatment, which has a high water content and contains a large amount of organic matter, pathogens, inorganic particles, colloids, heavy metal elements and other substances. Therefore, municipal sludge has a greater impact on the environment, and municipal sludge must be properly treated. In order to better solve the problem of sludge disposal, researchers at home and abroad have carried out a lot of research and practice. [0003] At present, the annual discharge of dry sludge from sewage treatment plants in my country is about 550×10 4 ~600×10 4 tons, of which the annual discharge of dry sludge from urban sewage treatment plants is about 50×10 4 tons, and is growing at a rate of more than 10...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/81C04B35/628
CPCC04B35/62204C04B35/62802C04B35/62886C04B2235/5276C04B2235/3418C04B2235/3445C04B2235/349C04B2235/36C04B2235/3217
Inventor 杨如如杨建威孙和平
Owner ZHEJIANG JIRUI CONSTR CO LTD