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Deep dewatering method for sludge

A treatment method and deep dehydration technology, applied in sludge treatment, water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problem of large consumption, high operating cost, and unrealized sludge reduction to achieve the effects of increased particle agglomeration, stable sludge properties, and easy resource utilization

Active Publication Date: 2015-02-18
北京金泥华牛科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods either have moisture content that cannot meet the requirements or have shortcomings such as high operating costs or increased sludge capacity, which cannot meet the actual needs.
[0004] Therefore, the current difficulties faced by deep sludge dewatering are that the existing conditioners have high cost, large dosage, complex conditioning process, high equipment investment and operation costs, and have not achieved sludge reduction, which easily affects sludge production. Disadvantages such as regeneration or subsequent utilization, poor environmental benefits, etc.

Method used

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  • Deep dewatering method for sludge

Examples

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Effect test

Embodiment 1

[0028] Using compressed air, waste iron filings, waste sulfuric acid, waste hydrochloric acid to prepare O by reaction 3 , FeCl 3 and Fe 2 (SO 4 ) 3 . In the oxidation and membrane breaking reaction tank composed of two small tanks, 1 ton of residual sludge with a water content of 99.7% was pumped into the first small tank, and 30 g of 98% waste sulfuric acid (pH was controlled at 6.5) and 2 g of O 3 , and stirred for 10 minutes. The sludge mixture enters another small pool, and 50g FeCl is added 3 solution, stirred for 10 minutes. The sludge mixture enters the flocculation reaction tank, and 50g Fe 2 (SO 4 ) 3 Solution, and dosing 2gPAM, stirring reaction for 20 minutes. Then enter the sedimentation tank and let it stand for 30 minutes to allow it to settle and concentrate. Take out the concentrated sludge from the bottom of the sedimentation tank, introduce a plate and frame filter press for dehydration, and keep it under the pressure of 1.2MPa for 40 minutes. Aft...

Embodiment 2

[0030] Using compressed air, waste iron filings, waste sulfuric acid, waste hydrochloric acid to prepare O by reaction 3 , FeCl 3 and Fe 2 (SO 4 ) 3 . In the oxidative membrane breaking reaction tank composed of two small tanks, 1 ton of residual sludge with a water content of 99.7% was pumped into the first small tank, and 30 g of 98% waste sulfuric acid (pH was controlled at 6.5) and 3 g of O 3 , and stirred for 10 minutes. The sludge mixture enters another small pool, and 50g FeCl is added 3 solution, stirred for 10 minutes. The sludge mixture enters the flocculation reaction tank, and 50g Fe 2 (SO 4 ) 3 Solution, and dosing 2gPAM, stirring reaction for 20 minutes. Then enter the sedimentation tank and let it stand for 30 minutes to allow it to settle and concentrate. Take out the concentrated sludge from the bottom of the sedimentation tank, introduce it into a plate and frame filter press for dehydration, and keep it under a pressure of 1.2MPa for 40 minutes. A...

Embodiment 3

[0032] Using compressed air, waste iron filings, waste sulfuric acid, waste hydrochloric acid to prepare O by reaction 3 , FeCl 3 and Fe 2 (SO 4 ) 3 . In the oxidative membrane breaking reaction tank composed of two small tanks, 1 ton of residual sludge with a water content of 99.7% was pumped into the first small tank, and 40 g of 98% waste sulfuric acid (pH was controlled at 6.5) and 4 g of O 3 , and stirred for 10 minutes. The sludge mixture enters another small tank, and 70g FeCl is added 3 solution, stirred for 10 minutes. The sludge mixture enters the flocculation reaction tank, and 70g Fe 2 (SO 4 ) 3 Solution, and dosing 2gPAM, stirring reaction for 20 minutes. Then enter the sedimentation tank and let it stand for 25 minutes to allow it to precipitate and concentrate. Take out the concentrated sludge from the bottom of the sedimentation tank, introduce it into a plate and frame filter press for press filtration and dehydration, keep it under a pressure of 1....

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Abstract

The invention relates to an efficient and environment-friendly deep dewatering method for sludge produced by municipal sewage treatment plants and sewage treatment and belongs to the technical field of sludge dewatering technologies. The method comprises steps as follows: under conditions of the normal temperature and the normal pressure, firstly, waste sulfuric acid, O3 and FeCl3 are fed into to-be-treated sludge for oxidation membrane-breaking pretreatment, so that oxidation breakage of sludge zoogloea structures and bacterial cell membranes is realized, and a large amount of constitution water, absorbing and wrapping water and unit cell water in the sludge become interstitial water; Fe2(SO4)3 and PAM are fed for strengthening and curing, coagulation sedimentation is performed, hydration products with the gelling property form reticular structures among sludge particles at the moment, and pores of the reticular structures are filled with crystalline hydration products, so that the inside of the sludge becomes more compact; finally, the moisture content of the sludge is decreased to 50% through dewatering by a filter press, and reduction, stabilization and harmless treatment of the sludge are realized.

Description

technical field [0001] The invention relates to a treatment method for deep dehydration of sludge produced in urban sewage treatment plants and sewage treatment, and belongs to the technical field of sludge dehydration technology. Background technique [0002] The treatment and disposal of excess sludge produced by sewage treatment plants is a major problem in environmental protection in the world today. Effectively reducing the moisture content of sludge is a technical bottleneck in the subject. At present, the mechanical dehydration method commonly used in my country's sewage treatment plants can reduce the moisture content of sludge to between 75% and 80%. "Notice" (Huanban [2010] No. 157) stipulates that if the sewage treatment plant transports the sludge to the factory for the purpose of storage (ie, no treatment and disposal), it must dehydrate the sludge to less than 50%. The residual sludge with moisture content is also a secondary pollutant in the sewage treatment p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/14C02F11/122C02F11/148
CPCC02F11/06C02F11/122C02F2303/06C02F11/148
Inventor 谭忠冠
Owner 北京金泥华牛科技有限公司
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