Sewage sludge advanced treatment device

Abstract

The invention discloses a sewage sludge advanced treatment device which comprises a crushing device, a drying device, a combustion device and a waste heat boiler. The sewage sludge advanced treatment device further comprises a sludge freezing container and a freeze drying energy circulating system. The freeze drying energy circulating system comprises a compressor, an evaporator, a condenser and a first heat exchanger arranged in the sludge freezing container. The air outlet end of the compressor is connected with the condenser, the evaporator is connected with the air inlet end of the compressor through the first heat exchanger, the condenser is communicated with the bottom of the drying device through a gas pipeline, and the evaporator is communicated with the top of the drying device through a gas pipeline. A heat conduction oil pipe is arranged in the waste heat boiler and performs heat transfer with air to heat the air, and the air heated is respectively conveyed to the drying device and the sludge freezing container to be used for sludge drying and unfreezing. According to the sewage sludge advanced treatment device, chemical agents do not need to be added, the sludge treatment amount is not increased, and sludge freezing efficiency and the heat utilization rate are improved through recycling of working medium energy and heat of sludge.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a sewage sludge advanced treatment device. 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. 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 method is to condition by adding...

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Problems solved by technology

[0005] In view of this, the present invention aims at the problems in the above-mentioned prior art that increasing the flocculant will increase the sludge treatment capacity, low freezing efficiency, and low recovery rate of waste heat from incineration, and provides a treatment process that does not increase the sludge treatment capacity. Sewage sludge advanced treatment device with high efficiency and high energy utilization

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