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A dehydration process of domestic sludge

A technology of domestic sludge and process, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of toxic gas emission, large equipment investment, long conversion time, etc., to achieve less impurity discharge, low energy consumption, dehydration good effect

Active Publication Date: 2016-06-29
ZHEJIANG FANGYUAN BUILDING MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, landfill will cause waste of land and secondary pollution; composting requires maintenance and drying to evaporate water, takes up a lot of space, takes a long time to transform, and also pollutes the environment; direct incineration equipment requires large investment and high operating costs. And there will be the problem of toxic gas emissions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This embodiment is a dewatering process for domestic sludge, which consists of the following steps:

[0026] Step 1: adding seawater to the domestic sludge for mixing, and stirring to form an initial sludge slurry, the moisture content of the initial sludge slurry is 88%;

[0027] Step 2: adding 98% concentrated sulfuric acid to the initial sludge slurry and stirring again, the amount of concentrated sulfuric acid added is 0.08% of the weight of the initial sludge slurry, and performing primary sedimentation treatment after stirring;

[0028] Step 3: adding calcium oxide to the initial sludge slurry after the initial sedimentation treatment, adjusting the pH value of the initial sludge slurry to 7, the amount of calcium oxide added is 2.3% of the weight of the initial sludge slurry after the initial sedimentation, And carry out secondary sedimentation treatment;

[0029] Step 4: diluting the initial sludge slurry after secondary sedimentation with water to form seconda...

Embodiment 2

[0034] This embodiment is a dewatering process for domestic sludge, which consists of the following steps:

[0035] Step 1: Adding domestic sludge to seawater for mixing, and stirring to form an initial sludge slurry, the moisture content of the initial sludge slurry is 93%;

[0036] Step 2: adding 95% concentrated sulfuric acid to the initial sludge slurry and stirring again, the amount of concentrated sulfuric acid added is 0.15% of the weight of the initial sludge slurry, and performing primary sedimentation treatment after stirring;

[0037] Step 3: adding calcium oxide to the initial sludge slurry after the initial sedimentation treatment, adjusting the pH value of the initial sludge slurry to 6.5, the amount of calcium oxide added is 2% of the weight of the initial sludge slurry after the initial sedimentation, And carry out secondary sedimentation treatment;

[0038] Step 4: diluting the initial sludge slurry after secondary sedimentation with water to form secondary s...

Embodiment 3

[0042] This embodiment is a dewatering process for domestic sludge, which consists of the following steps:

[0043]Step 1: Adding domestic sludge to seawater for mixing, and stirring to form an initial sludge slurry, the moisture content of the initial sludge slurry is 90%;

[0044] Step 2: adding 96% concentrated sulfuric acid to the initial sludge slurry and stirring again, the amount of concentrated sulfuric acid added is 0.12% of the weight of the initial sludge slurry, and performing primary sedimentation treatment after stirring;

[0045] Step 3: adding calcium oxide to the sludge slurry after the initial sedimentation treatment, adjusting the pH value of the initial sludge slurry to 7.5, the amount of calcium oxide added is 2.5% of the weight of the initial sludge slurry after the initial sedimentation treatment, and Carry out secondary sedimentation treatment;

[0046] Step 4: diluting the initial sludge slurry after secondary sedimentation with water to form secondar...

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Abstract

The invention provides a dehydration process of domestic sludge, which belongs to the technical field of sludge treatment. It solves the problems of high cost and serious pollution in existing domestic sludge treatment. The dehydration process of domestic sludge consists of the following steps: Step 1: Mix and stir the domestic sludge with water to form an initial sludge slurry; Step 2: Add sulfuric acid, perform initial sedimentation after stirring; Step 3: Add calcium oxide to adjust the initial sludge The pH value of the sludge slurry, and carry out secondary sedimentation treatment; Step 4: Dilute with water to form secondary sludge slurry again; Step 5: Apply pressure in the filter press to cause solid-liquid separation of the secondary sludge slurry and Form the dehydrated cake; Step 6: Stack the dehydrated cake evenly and dry it naturally. It can dry domestic sludge and press it into a solid block structure for easy recycling.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and relates to a sludge dewatering process, in particular to a domestic sludge dehydration process. Background technique [0002] Whether it is in the living area of ​​the city or the area where the production enterprise is located, a large amount of domestic sewage or production sewage will be generated. The discharge of domestic sewage has exceeded the discharge of industrial sewage. The sewage is treated by the sewage treatment plant and then discharged back into the environment. During the process of sewage treatment in the sewage treatment plant, a large amount of sludge will be deposited in the sewage treatment tank, and the sludge is the final accessory product of sewage treatment. These sludges contain a large number of microorganisms, organic matter and rich nutrients, and even contain There are a small amount of metal debris and pathogenic microorganisms, so whether the sludge ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/12C02F11/14
Inventor 杨晓华高梦兆崔清泉陈菁金明锋
Owner ZHEJIANG FANGYUAN BUILDING MATERIALS TECH
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