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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 sludge flocs have strong shear resistance and are not easy to be broken, which is the key to centrifugal dehydration , the cost of the chemical conditioner is high, the amount of chemical conditioner added and the operating cost are high, and the moisture content of the sludge after dehydration is above 75%.
The above two sludge dehydration reduction methods have high cost of chemical conditioners and high operating costs, and the moisture content of the sludge after dehydration is high, which increases the cost input for subsequent treatment and disposal of sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Take urban sewage sludge with a water content of 81.6%, add water to adjust the water content to about 90%; add 0.2% ferric chloride chemical conditioner, fully stir and react for 5 minutes; then add 1% calcium sulfate chemical conditioner, fully stir and react 5 minutes; then suck the conditioned sludge into the plate and frame filter press through the variable plunger pump, hold the pressure for 90 minutes at a pressure of about 1.0MPa, and then release the pressure and discharge the sludge. The moisture content of the dehydrated sludge is 59.7%. .

Embodiment 2

[0022] Take municipal sewage sludge with a water content of 77.8%, add water to adjust the water content to about 90%; add 0.5% ferric chloride chemical conditioner, fully stir and react for 6 minutes; then add 1.5% calcium oxide chemical conditioner, fully stir and react 5 minutes; then inject the adjusted sludge into the belt filter press through the plunger pump, keep the pressure at a pressure of about 1.2MPa for 75 minutes, and then release the pressure and discharge the sludge. The dehydrated sludge is 57.5%.

Embodiment 3

[0024] Take urban sewage sludge with a water content of 79.3%, add water to adjust the water content to about 90%; add 0.5% ferric sulfate and 0.3% ferric chloride mixed chemical conditioner, stir and react for 6 minutes; then add 2.5% calcium sulfate chemical Conditioning agent, fully stirred and reacted for 8 minutes; then injected the adjusted sludge into the screw press dehydrator through the screw pump, kept the pressure for 60 minutes under a pressure of about 1.2MPa, and then released the pressure and discharged, and the dehydrated sludge contained 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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