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Novel efficient sludge dewatering conditioner and application thereof

A technology for sludge dewatering and conditioning agent, which is applied in the fields of sludge treatment, biological sludge treatment, dehydration/drying/concentrated sludge treatment, etc. Chemical treatment, improved dehydration performance, and simple process

Inactive Publication Date: 2016-09-07
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the defects in the above-mentioned prior art, the purpose of the present invention is to provide a novel high-efficiency sludge dehydration conditioner and its application, aiming at the difficulty in dehydration of excess sludge produced by urban sewage treatment plants and the potential harm to the environment caused by subsequent treatment. To solve the problem of secondary pollution, a conditioner that uses microbial metabolism to effectively destroy the cell structure in the sludge and improve the sedimentation performance of the sludge is proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take the liquid sludge with a solid content of 0.9% from a domestic sewage treatment plant in Shanghai, add elemental sulfur and ferrous sulfate mixed reagent powder to it, the molar ratio is 1:5, and the amount added is 1% of the dry weight of the sludge. The aeration rate is 300ml / (min·L), and after 12 hours, the capillary water absorption time (CST) of the sludge can be reduced by 15% compared with the sludge without electrolytic treatment.

Embodiment 2

[0016] Take the liquid sludge with a solid content of 0.9% from a domestic sewage treatment plant in Shanghai, add elemental sulfur and ferrous sulfate mixed reagent powder to it, the molar ratio is 3:5, and the amount added is 3% of the dry weight of the sludge. The aeration rate is 600ml / (min·L), after 18 hours, the capillary water absorption time (CST) of the sludge can be reduced by 17% compared with the sludge without electrolytic treatment.

Embodiment 3

[0018] Take the liquid sludge with a solid content of 0.9% from a domestic sewage treatment plant in Shanghai, add elemental sulfur and ferrous sulfate mixed reagent powder to it, the molar ratio is 5:1, and the amount added is 8% of the dry weight of the sludge. The aeration rate is 500ml / (min·L), and after 24 hours, the capillary water absorption time (CST) of the sludge can be reduced by 25% compared with the sludge without electrolytic treatment.

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Abstract

The invention provides a novel efficient sludge dewatering conditioner which comprises elementary sulfur or reduced sulfide and ferrous sulfate. The molar ratio of the elementary sulfur or the reduced sulfide to the ferrous sulfate is 1:5-5:1, and the conditioner is powder. The invention further provides an application of the conditioner. The additive amount of the conditioner is 1%-10% of the dry weight of sludge, and CST (capillary suction time) of the sludge can be reduced by 15%-30% after treatment for 12-48 hours under the condition of the aeration rate of 300-900ml / (min*L). By adding harmless medicaments, growth and metabolism of microorganisms in the sludge are promoted, system environmental conditions are changed, and the dewatering performance of the sludge is improved.

Description

technical field [0001] The invention relates to the technical field of sludge treatment and disposal, in particular to a sludge dehydration conditioner and an application method thereof. Background technique [0002] Sludge is an inevitable product of sewage biological treatment in urban sewage treatment plants. The annual production of concentrated sludge (calculated at 98% moisture content) in my country has reached more than 300 million tons. huge. Sludge dehydration is an important link in sludge treatment and disposal. It can effectively reduce the volume of sludge and reduce the cost of subsequent transportation and treatment of sludge. Usually, sludge is mechanically dewatered to reduce the moisture content. However, since there are a large amount of hydrophilic substances in the sludge and the water content is high, it is very difficult to dehydrate it directly. Therefore, it is generally necessary to take pretreatment measures to adjust the dehydration performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C02F11/14C02F11/12
CPCC02F11/02C02F11/12C02F11/14Y02W10/20
Inventor 袁海平朱南文楼紫阳沈棒于豹
Owner SHANGHAI JIAO TONG UNIV
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