Method for realizing combined treatment of sludge through high-current electrolysis, high-voltage electrodialysis and high-air-pressure pressing filtration

A technology of combined treatment and high-voltage electricity, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the problems of high investment and operation costs, complex equipment, and difficulty in popularization and application, and achieve The effect of reducing the dry weight of sludge, low energy consumption and high economic benefit

Active Publication Date: 2017-06-13
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has complicated equipment, and the heat energy consumption per kilogram of water removed is 3000-4000kJ. The investment and operation costs are high, and it is difficult to popularize and apply.

Method used

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  • Method for realizing combined treatment of sludge through high-current electrolysis, high-voltage electrodialysis and high-air-pressure pressing filtration
  • Method for realizing combined treatment of sludge through high-current electrolysis, high-voltage electrodialysis and high-air-pressure pressing filtration

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Experimental program
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Effect test

Embodiment 2--13

[0030] According to the method of the above-mentioned embodiment, in the electrolysis-electrodialysis-air pressure filtration joint treatment sludge device, the sludge comes from the urban sewage treatment plant, and the anode electrode material is respectively adopted as RuO 2 -TiO 2 / Ti, IrO2 -Ta 2 o 5 / Ti, PbO 2 / Ti, stainless steel, carbon steel; cathode materials are respectively stainless steel, carbon steel, titanium, lead-antimony (Sb5-10wt%) alloy, lead-antimony-copper (Sb5-10wt%, Cu1-3wt%) alloy. The treatment process is to pump until the filter frame is filled with sludge, electrolyze with a constant current of 1000A for 5 minutes, press filter the air at 2MPa, empty the filtrate of the screen plate, and process the mud cake with a high voltage of 20KV (frequency 50Hz) for 5 minutes with a current of 0A , the above operations were carried out at room temperature. The water content of the obtained mud cake is shown in Table 1, and the voltage is the initial volta...

Embodiment 14-22

[0034] According to the method of embodiment 1, the city sewage plant sludge is imported by the pump. Anode is IrO 2 -Ta 2 o 5 / Ti, the cathode is made of stainless steel, different currents, pulse voltages and air pressure filter to treat sludge. The water content of the obtained mud cake is shown in Table 2.

[0035] Table 2 Results of combined treatment of sludge by electrolysis-electrodialysis-pressure filtration in different electrolysis processes

[0036]

Embodiment 23-26

[0038] According to the method of embodiment 1, the sludge from different sources is input by the pump. Anode is IrO 2 -Ta 2 o 5 / Ti, the cathode is stainless steel, electrolyzed with a current of 1000A for 5 minutes. Turn on the air compressor, compress the mud cake with air to 0.2MPa, most of the water in the mud cake will be released, turn on the high-voltage pulse stabilized voltage and current power supply, and pulse the mud cake with 20KV high voltage (frequency 50Hz) for 5 minutes, and the current is 0A . The water content of the obtained mud cake is shown in Table 3.

[0039] Table 3 Results of combined treatment of sludge from different sources of sludge by electrolysis-electroosmosis-pressure filtration

[0040] Example sludge type source of sludge Current / A Pulse voltage / KV Moisture content / % 23 municipal sludge Urban sewage plant 500 20 46.6 24 biochemical sludge Industrial Enterprises 500 20 59.1 25 river silt ...

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Abstract

The invention provides a method for realizing combined treatment of sludge through high-current electrolysis, high-voltage electrodialysis and high-air-pressure pressing filtration. Biochemical sludge is introduced through a sludge pump, the sludge is partially filtered under the pressure of the pump, and the sludge and the filtrate are filled in an electrolysis bath and then are subjected to high-current electrolysis; after the electrolysis of the sludge is completed, the sludge is subjected to pressing filtration by means of compressed air, and the filtrate in a screen is drained simultaneously, thereby forming an air insulation layer at both sides of a sludge cake; and the sludge is subjected to high-voltage pulse electrodialysis and high-air-pressure pressing filtration to dissociate internal water and adsorbed water in the sludge, thereby achieving the purpose of deep dewatering. The sludge treatment method provided by the invention combines the technologies of high-current electrolysis, high-voltage pulse electrodialysis and air-pressure pressing filtration; and the sludge water content can be directly reduced to 50% or below.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and in particular relates to a method for combined treatment of sludge by high-current electrolysis-high-voltage electrodialysis-high-pressure pressure filtration. Background technique [0002] With the development of my country's industrialization, the amount of sludge is increasing. According to statistics, more than 3,500 urban sewage treatment plants have been built in cities and counties across the country, with a sewage treatment capacity of about 145 million m 3 / d, more than 35 million tons of sludge with a water content of 80% are produced annually. These sludges are composed of biological flocs and fungal cells of activated sludge. Inorganic particles contain toxic and harmful organic substances, heavy metal ions and various microorganisms containing a large number of bacteria. At present, the sludge dehydration methods of urban sewage treatment plants are centrifugation, pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/12C02F11/00
Inventor 甘永平张文魁黄辉夏阳梁初张俊林沛沛王奕顺
Owner ZHEJIANG UNIV OF TECH
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