Treatment method of organic solid waste

A technology of organic solids and treatment methods, which is applied in the field of environmental engineering, can solve the problems of low treatment efficiency of organic solid waste, low digestion rate of anaerobic digestion method, and waste of a lot of resources by incineration method, so as to improve the biochemical performance and reduce the Hazards of land use and landscaping use, effects of shorter dwell times

Inactive Publication Date: 2013-09-04
HUBEI GUOXIN TIANHUI ENERGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a treatment method for organic solid waste to solve the waste of a large amount of resources in the prior art incineration method, the burial method is easy to cause secondary pollution, and the anaerobic digestion method has low digestion rate and long residence time , and the efficiency of organic solid waste treatment is low, and the disadvantage of consuming a lot of energy when drying sludge

Method used

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  • Treatment method of organic solid waste
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Examples

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Effect test

Embodiment 1

[0057] Example 1, the organic solid waste is animal husbandry waste, the steps are as above, wherein the thermal hydrolysis reaction temperature is 130°C, the thermal hydrolysis reaction pressure is 2bar, the thermal hydrolysis reaction time is 38min, and the temperature in the digestion process is 40°C, the digestion time is 15 days, the pH value during the digestion process is 7.9, the mass percentage of water in the formed dewatered sludge is 62%, and the water content of the generated biogas residue is 23%; the treatment effect of organic solid waste Significantly enhanced, the reduction of organic solid waste is significantly improved, and the treatment time is significantly reduced, the biogas production is increased by more than 50% compared with the existing process, and the construction cost is further reduced due to the 50% reduction in the volume of the digested sludge tank.

Embodiment 2

[0058] Example 2, the organic solid waste is agricultural straw, the steps are as above, wherein the thermal hydrolysis reaction temperature is 150°C, the thermal hydrolysis reaction pressure is 4bar, the thermal hydrolysis reaction time is 60min, and the temperature during the digestion process is 38 ℃, the digestion time is 20 days, the pH value during the digestion process is 7.8, the mass percentage of water in the formed dewatered sludge is 65%, and the water content of the generated biogas residue is 30%; the treatment effect of organic solid waste is relatively Enhanced, the reduction of organic solid waste has been improved, and the treatment time has been reduced, the biogas production has increased by more than 50% compared with the existing process, and the construction cost has been further reduced due to the 50% reduction in the volume of the digested sludge tank.

Embodiment 3

[0059] Example 3, the organic solid waste is sludge, and the steps are as above, wherein the thermal hydrolysis reaction temperature is 170°C, the thermal hydrolysis reaction pressure is 7bar, the thermal hydrolysis reaction time is 15min, and the temperature during the digestion process is 42 ℃, the digestion time is 11 days, the pH value during the digestion process is 8.0, the mass percentage of water in the formed dewatered sludge is 60%, and the water content of the generated biogas residue is 20%; the treatment effect of organic solid waste is relatively Enhanced, the reduction of organic solid waste is significantly improved, and the treatment time is greatly reduced, the biogas production is increased by more than 50% compared with the existing process, and the construction cost is further reduced due to the 50% reduction in the volume of the digested sludge tank.

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Abstract

The invention relates to a treatment method of organic solid waste. The treatment method comprises the following steps of: homogenizing the organic solid waste and then preheating, carrying out a thermal hydrolysis reaction on the preheated organic solid waste, then pushing the material into a depressurization tank and a buffer tank to be subjected to primary depressurization and secondary depressurization and then temporary storage, then carrying out heat exchange on the material, carrying out anaerobic digestion on the material subjected to heat exchange, carrying out vacuum degassing treatment on digested sludge in a digested sludge tank, dehydrating the treated digested sludge to form dehydrated sludge, conveying the dehydrated sludge to a drying room to be dried, and producing dried biogas residue. According to the treatment method of the organic solid waste, high temperature hydrolysis and anaerobic digestion technologies are adopted, the problems that resource is wasted when a burning method is adopted and secondary pollution can be easily caused when a burying method is adopted can be avoided, digestive efficiency in follow-up anaerobic digestion is improved, standing time of an anaerobic digestion process is also reduced, and sludge subjected to anaerobic digestion is subjected to vacuum degassing, so that carbon dioxide and ammonium nitrogen in the digested sludge can be effectively removed, and sludge dehydration efficiency is improved.

Description

technical field [0001] The invention relates to the field of environmental engineering, in particular to a method for treating organic solid waste. Background technique [0002] In recent years, due to the rapid development of my country's economy, the continuous improvement of people's living standards, the continuous acceleration of urbanization, and the continuous strengthening of the country's environmental governance, the amount of organic solid waste has increased rapidly. For example, the breeding manure and sludge produced by livestock and poultry farms contain a large number of pathogenic bacteria, parasite eggs, heavy metals such as chromium and mercury, and toxic, harmful and carcinogenic substances that are difficult to degrade, such as dioxins, which can easily pollute groundwater and soil. , directly endanger human health. [0003] At present, there are mainly the following methods for the treatment and disposal of organic solid waste: incineration, landfill, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/10C02F11/04C02F11/14
CPCY02E50/30Y02W10/20Y02W10/37
Inventor 骆民强黄祥胜窦文龙程卫华
Owner HUBEI GUOXIN TIANHUI ENERGY
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