Sludge dewatering chemical amendment and its dewatering method

A technology of sludge dehydration and chemical conditioning, which is applied in the direction of fixing on or in the inorganic carrier, can solve the problems of high cost of chemical conditioning agents, high moisture content of sludge, increased cost input, etc., and achieve the effect of reducing costs

Active Publication Date: 2007-06-27
SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical conditioner used in drum vacuum filtration and negative pressure dehydration is a synergistic effect of salt and polymer polyacrylamide, which can neutralize the electrical properties of the sludge and the bridging effect of adsorption. The cost of the chemical conditioner is relatively high and requires The vacuum pump maintains a negative pressure state, which requires high energy consumption, and the moisture content of the sludge after dehydration is above 80%. With the role of electricity and adsorption bridging in the sludge, the formed slud

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] Take urban sewage sludge with 81.6% water content, add water to adjust to about 90% water content; add 0.2% ferric chloride chemical conditioning agent, fully stir for 5 minutes; then add 1% calcium sulfate chemical conditioning agent, fully stir the reaction 5 minutes; then the conditioned sludge is sucked into the plate and frame filter press through the variable plunger pump, and the pressure is maintained at a pressure of about 1.0MPa for 90 minutes, and then the pressure is released and the material is discharged. The moisture content of the dewatered sludge is 59.7% .

Example Embodiment

[0021] Example 2

[0022] Take municipal sewage sludge with water content of 77.8%, add water to adjust to about 90% water content; add 0.5% ferric chloride chemical conditioning agent, fully stir the reaction for 6 minutes; then add 1.5% calcium oxide chemical conditioning agent, fully stir the reaction 5 minutes; then the adjusted sludge is injected into the belt filter press through a plunger pump, the pressure is maintained at a pressure of about 1.2MPa for 75 minutes, and then the pressure is released and the material is discharged. The dewatered sludge is 57.5%.

Example Embodiment

[0023] Example 3

[0024] Take city sewage sludge with water content of 79.3%, add water to adjust to about 90% water content; add 0.5% ferric sulfate and 0.3% ferric chloride mixed chemical conditioning agent, fully stir and react for 6 minutes; then add 2.5% calcium sulfate chemical Conditioner, fully agitate and react for 8 minutes; then the adjusted sludge is injected into the screw press dehydrator through a screw pump, and the pressure is maintained at a pressure of about 1.2MPa for 60 minutes, and then the pressure is released and the material is discharged. The dehydrated sludge contains water The rate is 56.5%.

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PUM

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Abstract

The sludge dewatering chemical amendment is iron salt, calcium salt and/or calcium oxide, and during dewatering sludge, the added amount of iron salt is 0.2-1.5 wt% of sludge and that of calcium salt and/or calcium oxide is 1-4.5 wt%. The sludge dewatering process includes the following steps: 1. amending sludge through adding water, adding iron salt in 0.2-1.5 wt%, stirring for 1-6 min, adding calcium salt and/or calcium oxide in 1-4.5 wt%, stirring for 2-8 min; and 2. pressurizing to dewater sludge at 1.0-2.0 MPa for 45-90 to water content in sludge of 50-60 %. The present invention has lowcost and high dewatering effect.

Description

technical field [0001] The invention belongs to sludge treatment technology, in particular to a chemical conditioning agent for sludge dehydration and a sludge dehydration method thereof. technical background [0002] The sludge referred to in the present invention refers to the solid, semi-solid and liquid wastes produced by the treatment of sewage, which contain a large amount of organic matter, heavy metals, pathogenic bacteria and pathogenic bacteria, etc. If they are discharged without treatment, they will cause serious damage to the environment. pollute. The general requirements for sludge treatment are stabilization, harmlessness and reduction. There are many ways to reduce sludge. There are two main ways to reduce sludge. One is to reduce the amount of organic matter (digestion, incineration), and the other is to reduce the moisture content of sludge (concentration, dehydration, drying, incineration, etc.) ). The second way is simpler and easier than the first way...

Claims

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Application Information

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IPC IPC(8): C12N11/14
Inventor 钟环声龙广生杨海英李观尚
Owner SWISON CREATIVE ENVIRONMENTAL SOLUTIONS CO LTD
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