Energy-saving type sewage sludge harmless treatment method

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 ...

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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 incineration waste heat recovery rate, etc., and provides a treatment process that does not increase the sludge treatment capacity. Energy-saving sewage sludge harmless treatment method with high efficiency and high energy utilization rate

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