Multi-field coupling sewage sludge automatic dehydration device

Abstract

The invention discloses a multi-field coupling sewage sludge automatic dehydration device which comprises a sludge treatment chamber, a full-automatic hydraulic system, a direct-current power supply, a microwave generation system, a feeding system, a discharging system and an ultrasonic system. The feeding system is communicated with the side part of the sludge treatment chamber; An anode plate and a cathode plate are arranged in the sludge treatment chamber; the anode plate is arranged at the upper part of the sludge treatment chamber; the cathode plate is arranged at the lower part of the sludge treatment chamber; a positive electrode and a negative electrode of the direct-current power supply are respectively connected with the anode plate and the cathode plate; and water outlet holes are formed in the anode plate and the cathode plate. The microwave generation system is arranged at the lower part of the cathode plate. The ultrasonic system is arranged at the lower part of the cathode plate. The discharging system is arranged below the cathode plate. The anode plate is connected with the full-automatic hydraulic system for driving the anode plate to move. The dewatering effect is good, and the water distribution in the sludge thickness direction is uniform.

Description

technical field [0001] The invention relates to the field of sewage sludge treatment, in particular to a sewage sludge dewatering device which achieves a lower water content through multi-field coupling (ultrasonic field, microwave field, electric field, mechanical stress field) synergistic coupling effect. Background technique [0002] With the continuous expansion of the construction scale of urban sewage treatment facilities in our country, the amount of sludge generated in the process of sewage treatment has increased sharply. As of the end of 2019, the annual output of sludge (with a moisture content of 80%) in my country has exceeded 40 million tons, and it is expected to reach 60-80 million tons in 2020. Obviously, the high water content of sludge is the bottleneck that restricts the treatment and disposal of sludge. The sludge with high water content is not only bulky, but also contains a large amount of organic matter, heavy metals and harmful microorganisms, which ...

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Problems solved by technology

[0009] However, the multi-field coupling dehydration technology still has the following problems: (1) During the electroosmosis process, the moisture content of the sludge near the anode decreases rapidly, and the generation of electrochemical reaction gas and the occurrence of cracks in the sludge cake, the sludge The contact area between the mud cake and the electrode plate decreases, resulting in an increase in sludge resistance, a decrease in current, and a poor dehydration effect; (2) During the dehydration process, the electric field and microwave field convert electrical energy into heat energy, making the sludge temperature (3) The moisture content of the mud cake in the thickness direction is unevenly distributed, the moisture content of the sludge in the anode layer is low, and water molecules accumulate in the cathode layer, resulting in pollution near the cathode plate. The moisture content of the mud is high; (4) During the dehydration process, multiple fields are attached to the sludge chamber at the same time, which is prone to experimental hazards

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