Energy-saving type sewage sludge harmless treatment method

A harmless treatment of sewage sludge, applied in dehydration/drying/concentrated sludge treatment, sludge treatment through temperature control, combustion methods, etc., can solve the problem of low freezing efficiency, low recovery rate of waste heat from incineration, increased pollution Mud treatment volume and other issues

Inactive Publication Date: 2014-11-12
CHINA JILIANG UNIV
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  • Abstract
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Problems solved by technology

[0007] In view of this, the present invention aims at the problems existing in the above-mentioned prior art that increasing the flocculant will increase the sludge treatment capacity, low freezing efficiency, and low incinera...

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  • Energy-saving type sewage sludge harmless treatment method
  • Energy-saving type sewage sludge harmless treatment method
  • Energy-saving type sewage sludge harmless treatment method

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0027] As shown in the figure, an energy-saving sewage sludge harmless treatment method of the present invention comprises the following steps:

[0028] 1) The sludge in the sludge freezing container is continuously frozen by the freeze-drying energy circulation system, and the sludge is thawed after continuous freezing, so that the freezing and thawing is repeated many times. This step is based on the drying device 3 and the freeze-drying energy circulation system. The freeze-drying energy cycle system described includes a compressor 5, an evaporator 6, a condenser 7 and a first heat exchanger 8 arranged in the sludge freezing container 4, the gas outlet of the compressor 5 is connected with the condenser 6, and the condenser 7 is connected to the evaporator 6 through the throttling element 9, and the evaporator 6 is connected to the intake en...

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Abstract

The invention discloses an energy-saving type sewage sludge harmless treatment method. The method includes the following steps of firstly, conducting continuous freezing on sludge through a freeze drying energy circulation system, and unfreezing the sludge after continuous freezing; secondly, conducting dewatering on the sludge, completely processed through freezing and unfreezing, in a filter pressing device, so that sludge with the low moisture content is obtained through filter pressing; thirdly, smashing the sludge in a smashing device; fourthly, conveying smashed sludge particles into a sludge drying device to be dried, dissipating heat through the freeze drying energy circulation system by means of a condenser, and transferring heat to air; fifthly, sending the sludge particles into an incinerator to be incinerated, making generated high-temperature smoke enter a waste heat boiler, making air heated by the condenser enter a second heat exchanger to continue to absorb heat, and unfreezing the sludge and drying the sludge particles through the formed high-temperature air. By means of the method, the sludge processing amount cannot be increased in the treatment process, and due to recycling of working medium energy, the freezing efficiency and the heat utilization rate of the sludge are increased.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to an energy-saving and harmless treatment method for sewage sludge. Background technique [0002] A large amount of sludge is produced in the process of sewage treatment, which accounts for about 0.3%-0.5% of the treated water. The investment and operation cost of sludge treatment are very huge, and the cost of sludge treatment generally accounts for 20% of the operating cost of sewage treatment plants. %-50%, bringing a heavy burden to sewage treatment. Sludge treatment methods mainly include conditioning, dehydration, drying, and then disposal measures such as incineration, landfill, and resource utilization. [0003] Sludge dewatering is a very important part of sludge treatment and plays an important role in the subsequent treatment and disposal of sludge. The key to sludge dewatering is to improve the dewatering performance of sludge. The current traditional treatment ...

Claims

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Application Information

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IPC IPC(8): C02F11/12C02F11/20F23G7/00
Inventor 饶宾期欧阳华兵
Owner CHINA JILIANG UNIV
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