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Sludge dewatering conditioning agent and deep dewatering method thereof

A sludge dewatering and deep dewatering technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of unfavorable sludge resource utilization and high cost of sludge drying treatment, and achieve shortened settling time, low cost and high efficiency. The effect of the application foreground

Active Publication Date: 2014-03-05
ヂュハイクェァチュアンエンバイロメントリソースィズカンパニーリミテッド
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing sludge conditioning technology is mainly to add flocculants and other agents to condition the sludge and then mechanically dewater it. After mechanical dehydration, the moisture content of the sludge is generally 70%-80%, which is still not conducive to the resources of sludge. If it is to be used as a fuel, it is necessary to dry the sludge, and the cost of drying the sludge is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1) Take the sludge from Xiangtan Sewage Treatment Plant, which has a water content of 98%, and then add the semi-coke product obtained by pyrolysis of Shaanxi coal at 650°C for 1.0 h. The particle size of the semi-coke is 0.045 mm-0.425 mm. 2% of the weight of the water-containing sludge, fully stirred for 10 minutes;

[0017] 2) Then add polyacrylamide, the dosage of polyacrylamide is 0.0001% of the weight of the water-containing sludge, and stir for 10 minutes.

[0018] 3) After the conditioned sludge is left in the sedimentation tank for 15 minutes, the concentrated sludge is drawn from the bottom of the sedimentation tank, introduced into a plate and frame filter press for dehydration, and kept at a pressure of 0.8 MPa for 20 minutes;

[0019] 4) Release the pressure and discharge the material.

[0020] The moisture content of the mud cake after dehydration is 49.8%.

Embodiment 2

[0022] 1) Take the sludge from Xiangtan Sewage Treatment Plant, which has a water content of 98%, and then add the semi-coke product obtained by pyrolysis of Shaanxi coal at 650°C for 1.0 h. The particle size of the semi-coke is 0.045 mm-0.425 mm. 2% of the weight of the water-containing sludge, fully stirred for 10 minutes;

[0023] 2) Then add polyacrylamide, the dosage of polyacrylamide is 0.0002% of the weight of aqueous sludge, and stir for 10 min.

[0024] 3) After the conditioned sludge is left in the sedimentation tank for 20 minutes, the concentrated sludge is drawn from the bottom of the sedimentation tank, introduced into a plate and frame filter press for dehydration, and kept at a pressure of 2.0 MPa for 20 minutes;

[0025] 4) Release the pressure and discharge the material.

[0026] The moisture content of the mud cake after dehydration is 49.2%.

Embodiment 3

[0028] 1) Take the sludge from Xiangtan Sewage Treatment Plant, which has a water content of 98%, and then add the semi-coke product obtained by pyrolysis of Shaanxi coal at 650°C for 1.0h. The particle size of the semi-coke is 0.045mm-0.425mm. 3% of the weight of the water-containing sludge, fully stirred for 15 minutes;

[0029] 2) Then add polyacrylamide, the dosage of polyacrylamide is 0.0003% of the weight of aqueous sludge, and stir for 10 minutes.

[0030] 3) After the conditioned sludge is allowed to stand in the sedimentation tank for 20 minutes, the concentrated sludge is drawn out from the bottom of the sedimentation tank, introduced into a plate and frame filter press for dehydration, and kept at a pressure of 3.0 MPa for 30 minutes;

[0031] 4) Release the pressure and discharge the material.

[0032] The moisture content of the mud cake after dehydration is 45.9%.

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Abstract

The invention belongs to the technical field of urban sewage and sludge treatment and relates to a sludge dewatering conditioning agent and a deep dewatering method thereof. The invention discloses the novel sludge conditioning agent. The sludge conditioning agent comprises polyacrylamide and a coal pyrolysis product, namely semicoke; the invention also discloses the method for treating the sludge by using the conditioning agent; the method comprises the following steps: firstly, concentrating and dewatering the sludge by using the conditioning agent, wherein the BOD (Biochemical Oxygen Demand), COD (Chemical Oxygen Demand) and SS (Suspended Solids) of supernatant liquor after concentrating and dewatering can meet secondary sewage drain standard, and the water content of the treated sludge is less than 80%; then, directly filter-pressing and dewatering the concentrated and dewatered sludge, wherein the water content of the treated sludge is less than 50%. The used sludge conditioning agent is extremely strong in adsorption capacity, low in cost and excellent in performance; the sludge treatment process is simple, the dewatering time is short and the water content of the sludge is low; the dewatered sludge can be directly recycled without drying and dewatering, so that the sludge dewatering conditioning agent has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of urban domestic sewage sludge treatment, and relates to a sludge dehydration conditioner and a deep dehydration method thereof. Background technique [0002] With the rapid development of my country's economy, the amount of urban sewage treatment is constantly increasing. In the process of sewage treatment, a large amount of sludge will be generated. Due to the serious phenomenon of "heavy water and light mud" in the construction of sewage treatment plants in my country, a large amount of The "backlog" of sludge has not been properly and safely disposed of. After the sludge that has not been properly treated enters the environment, it directly brings serious secondary pollution to the environment, which not only reduces the effective treatment capacity of the sewage treatment system, but also poses a serious threat to the ecological environment and human life. With the improvement of people's awareness of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/14
Inventor 戴财胜马淞江刘良良梁丽静刘晓芳刘学鹏
Owner ヂュハイクェァチュアンエンバイロメントリソースィズカンパニーリミテッド
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