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Efficient and low-cost anaerobic method and device

A low-cost, high-efficiency technology, applied in chemical instruments and methods, biological sludge treatment, pyrolysis treatment of sludge, etc., can solve the problems of secondary pollution, waste, mud cake easy to block the discharge port, etc., to achieve high efficiency and low Cost structure, reduce operation difficulty, and facilitate the effect of continuous work

Pending Publication Date: 2019-06-14
SHENZHEN ECO SOLUTION TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The anaerobic digestion currently on the market is to mix the sludge with a moisture content of 80% to a moisture content of 92% and then enter the anaerobic unit. After staying in the anaerobic unit for 20-30 days, it enters the dehydration unit. Lime and trichloride must be added during dehydration. Iron, after mechanical dehydration, a mud cake with a moisture content of about 60% is produced. For the existing process, the process steps are unreasonable, and there are no special facilities. The dehydration rate of the dehydration device is low, and the sludge cannot be selected according to the demand. Squeeze force, the sludge will form intracellular water again before dehydration, and chemicals must be added during the dehydration process, resulting in a high moisture content of the sludge; and the mud cake after dehydration is easy to block the discharge port
It leads to high energy consumption, long time, and many residual bacteria, especially incomplete dehydration, which causes a lot of waste and causes secondary pollution. Therefore, a high-efficiency and low-cost anaerobic method and device are proposed to solve the above problems.

Method used

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  • Efficient and low-cost anaerobic method and device

Examples

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Effect test

Embodiment 1

[0041] Sludge with a water content of 80% is mixed with diluted water until the water content reaches 90%, and then enters the anaerobic unit, and stays in the anaerobic unit for 10 days. The mud concentration tank is concentrated to a water content of 97%, and the concentrated clarified water enters the thermal hydrolysis reactor together with the biogas residue, and the boiler provides continuous and stable high-pressure saturated steam (pressure 1.1-1.2Mpa) to the reactor. Heat the mud, inject saturated steam for 30 minutes, stop injecting saturated steam and keep for 20 minutes; then open the pressure relief valve to start exhaust and pressure relief, open the discharge valve at the end of exhaust, and discharge the treated mud obtained by thermal hydrolysis treatment; After the discharged treatment mud is cooled, dehydration treatment is carried out to obtain the press filtrate and dewatered cake with a water content of 45%, and the press filtrate is returned to the previo...

Embodiment 2

[0043] Sludge with a water content of 80% is mixed with diluted water until the water content reaches 90%, and then enters the anaerobic unit, and stays in the anaerobic unit for 10 days. The mud concentration tank is concentrated to a water content of 97%. The concentrated clarified water and biogas residue enter the thermal hydrolysis reactor, and the boiler provides continuous and stable high-pressure saturated steam (pressure 1.2-1.3Mpa) to the reactor. Heating the mud, injecting saturated steam for 20 minutes, stopping injecting saturated steam and maintaining it for 10 minutes; then opening the pressure relief valve to start exhaust and pressure relief, and opening the discharge valve at the end of the exhaust to discharge the treated mud obtained by thermal hydrolysis treatment; The discharged treatment mud is cooled and dehydrated to obtain the press filtrate and dewatered cake with a water content of 40%, and the press filtrate is returned to the front stage as dilutio...

Embodiment 3

[0045]Sludge with a water content of 80% is mixed with diluted water to a water content of 92% and then enters the anaerobic unit and stays in the anaerobic unit for 10 days. The mud concentration tank is concentrated to a water content of 97%. The concentrated clarified water and biogas residue enter the thermal hydrolysis reactor, and the boiler provides continuous and stable high-pressure saturated steam (pressure 1.3-1.4Mpa) to the reactor. The mud is heated, injected with saturated steam for 10 minutes, stopped injecting saturated steam and kept for 5 minutes; then opened the pressure relief valve to start exhaust and pressure relief, and opened the discharge valve at the end of the exhaust to discharge the treated mud obtained by thermal hydrolysis treatment; The discharged treatment mud is cooled and dehydrated to obtain the press filtrate and dewatered cake with a water content of 35%, and the press filtrate is returned to the front stage as dilution water.

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Abstract

The invention discloses an efficient and low-cost anaerobic method and device. The efficient and low-cost anaerobic method comprises the steps of size mixing, anaerobic process, pyrohydrolysis and dehydration, wherein sludge is subjected to size mixing firstly and then enters an anaerobic unit, biogas generated by the anaerobic unit provides energy for a boiler, the boiler provides heat for the pyrohydrolysis unit after the anaerobic unit, the sludge subjected to the pyrohydrolysis is dehydrated by special equipment to obtain mud cakes meeting the standard, and generated waste water is returned to a size mixing unit for reuse, and the special equipment is a dehydration device for an efficient and low-cost anaerobic process. According to the efficient and low-cost anaerobic method and device, the production efficiency is greatly improved, the production cost is remarkably reduced, and the efficient and low-cost anaerobic method and the device are environmentally friendly, efficient andlow in energy consumption.

Description

technical field [0001] The invention relates to an anaerobic method and device with high efficiency and low cost, and belongs to the technical field of anaerobic process application. Background technique [0002] The sludge anaerobic process refers to the decomposition of biodegradable organic matter in the sludge into CH by facultative bacteria and anaerobic bacteria under anaerobic conditions. 4 , CO 2 、H 2 O and H 2 S's digestion technology, which can remove 30% to 50% of organic matter in waste and stabilize it, is one of the common methods for sludge reduction and stabilization, and is the most economical sludge treatment method for large sewage plants. The sludge anaerobic process is the most commonly used method for stabilizing organic sludge, and it can treat sludge with high organic content. The organic matter is anaerobically decomposed, and with the stabilization of the sludge, a large amount of biogas with high calorific value is generated as energy, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/10C02F11/121
Inventor 黄彤宇杨晓健褚祥运
Owner SHENZHEN ECO SOLUTION TECH CORP
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