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Deep dehydration method for sludge

A deep dewatering and sludge technology, which is applied in sludge treatment, biological sludge treatment, electrochemical sludge treatment, etc. Applicability, the effect of enhancing the dehydration effect

Inactive Publication Date: 2017-11-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the initial stage of anaerobic storage, extracellular polymers were hydrolyzed, and part of the bound water stored in the extracellular polymers in the sludge was released as free water, which increased the water mobility and increased the conductivity of the sludge after anaerobic storage. , which provides favorable conditions for electric dehydration technology, but there is no proposal on the dehydration methods of deep dehydration technologies such as the influence of high-solid sludge anaerobic storage on sludge dehydration and sludge anaerobic storage pretreatment combined with electric dehydration

Method used

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  • Deep dehydration method for sludge

Examples

Experimental program
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Effect test

Embodiment 1

[0036]The treatment object of this embodiment is the sludge treated by the mechanical dehydration process of a certain sewage plant. The mechanical dehydration process uses a cationic polyacrylamide flocculant for belt filter press treatment. The moisture content of the treated sludge is 82.46%.

[0037] The anaerobic storage process of this implementation case adopts a constant temperature storage condition of 35°C. The electric dehydration system of this embodiment adopts a laboratory-scale electric dehydration device with vertical direct current electric field and mechanical pressure. The electric dehydration operating conditions are: voltage gradient 30V / cm, mechanical pressure 75kPa, mud cake thickness 0.8cm, electric dehydration time 10min.

[0038] After the mechanical dehydration described in this example, the sludge enters such as figure 1 In the treatment system shown, after 72 hours of anaerobic storage treatment, electric dehydration treatment is performed. Compare...

Embodiment 2

[0040] The processing object of this embodiment is the same as that of Embodiment 1.

[0041] The anaerobic storage process of this implementation case adopts a constant temperature storage condition of 25°C. The electric dehydration device and operating conditions of the electric dehydration system in this implementation case are the same as those in Embodiment 1.

[0042] After the mechanical dehydration described in this example, the sludge enters such as figure 1 In the treatment system shown, after anaerobic storage treatment for 72 hours, electric dehydration treatment is performed. Compared with direct electric dehydration treatment of mechanically dewatered sludge, the final moisture content is reduced by 3.99%, which enhances the effect of deep dehydration.

Embodiment 3

[0044] The treatment object of this embodiment is the sludge treated by the mechanical dehydration process of a certain sewage plant, with a moisture content of 80.89%, and the sludge with an adjusted initial moisture content of 85.38%.

[0045] The anaerobic storage process of this implementation case adopts a constant temperature storage condition of 25°C. The electric dehydration device and operating conditions of the electric dehydration system in this implementation case are the same as those in Embodiment 1.

[0046] The sludge described in this example enters such as figure 1 In the treatment system shown, after 72 hours of anaerobic storage treatment, electric dehydration treatment is performed. Compared with direct electric dehydration treatment of mechanically dewatered sludge, the final moisture content of the sludge with an initial moisture content of 80.89% is reduced by 3.64%, and the initial water content The final moisture content of the sludge with a concentr...

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Abstract

The invention relates to a deep dehydration method for sludge. The deep dehydration method for sludge comprises an anaerobic storage process and an electric dehydrating process. To-be-treated sludge enters a sludge anaerobic storage system for the anaerobic storage process of the sludge for anaerobic storage of the sludge; sludge after anaerobic storage enters the electric dehydrating process of the sludge for the electric dehydrating process of the sludge for electrically dehydrating the sludge under the action of a direct current electric field; the sludge after anaerobic treatment is increased in dehydrating rate and dehydrating limit in the electric dehydrating treatment process, the dehydrating effect is obviously enhanced, and working conditions can be adjusted according to demands to meet different sludge quality demands on follow-up treatment disposal and resource utilization such as sludge landfill, incineration and drying. The method is simple in treatment process, no additives are introduced, and meanwhile, the method can be extended or rebuilt based on an original mechanical dehydrating process of a sewage plant, and the method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a deep sludge dehydration method based on electric dehydration technology. Background technique [0002] Improving the treatment efficiency of sludge and realizing the efficient utilization of sludge resources have always been the focus of people's research, and the sludge dehydration process is to reduce the cost of sludge treatment, transportation and disposal, improve the efficiency of sludge treatment and disposal, and realize the realization of sludge resources. key technology for utilization. [0003] Traditional mechanical dehydration, which is the most widely used in practice, can only meet the discharge requirements of sludge with a water content of 80%, but cannot meet the requirements of landfill mud (water content lower than 60%) and incineration mud (water content lower than 50%) , and landscaping mud and brick mud (water content less than 40%) ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/12
CPCC02F11/006C02F11/04C02F11/12Y02W10/20
Inventor 张书廷李英特
Owner TIANJIN UNIV