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Method for improving semi-dry fermentation stability of municipal sludge by adding cassava vinasse

A technology for cassava distiller's grains and municipal sludge, which is applied in the field of solid waste recycling, can solve the problems of low degree of hydrolysis and acidification, high solid content, slow methane production process, etc., so as to reduce viscosity and stirring energy consumption, and improve gas production rate. , the effect of saving energy

Inactive Publication Date: 2012-08-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for overcoming the defects of high viscosity of the reaction substrate, high solid content, difficult mass transfer, low degree of hydrolysis and acidification, slow process of methane production and the like in the dry fermentation process of municipal sludge in the prior art. Method for Improving the Performance of Municipal Sludge Semi-dry Fermentation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Start fermentation

[0033] Take 5L of anaerobic sludge as the inoculation sludge, put it in an anaerobic fermentation tank with an effective volume of 15L, set the material temperature in the anaerobic fermentation tank to 53±2°C,

[0034] Dewatered sludge (pH 8.0) with a solid content of 15% and an organic content of 70% and cassava distiller's grains (pH 4.0) with a solid content of 12% and an organic content of 73% were totaled at a mass ratio of 5:1 333g (accounting for 3.3% of the mass of inoculated sludge in the anaerobic fermentation tank), the mixed material with a solid content of 14% (pH value is 7.6) is added to the anaerobic fermentation tank with an effective volume of 15L every day;

[0035] When the fermented material in the anaerobic fermenter is 10L, increase the daily dosage of the mixed material in the anaerobic fermenter to 400g, and the amount added is 4% of the mass of the inoculated sludge in the anaerobic fermenter, and correspondingly disch...

Embodiment 2

[0042] (1) Start fermentation

[0043] Take 7.5L of anaerobic sludge as inoculation sludge, put it in an anaerobic fermentation tank with an effective volume of 15L, set the temperature of the material in the anaerobic fermentation tank to 53±2°C, and dehydrate the solid content to 20% and the organic matter content to 55%. Sludge (pH value 7.8) and cassava distiller's grains (pH value 4.0) with a solid content of 14% and an organic matter content of 73% are 375g in total according to the mass ratio of 1:1 (accounting for 3.8% of the inoculated sludge mass of anaerobic fermentation tank ), the mixed material with a solid content of 17% (pH value is 7.3) is added to an anaerobic fermentation tank with an effective volume of 15L every day;

[0044] When the fermented material in the anaerobic fermenter is 10L, increase the daily dosage of the mixed material to the fermenter to 500g, and the amount added is 5% of the mass of the inoculated sludge in the anaerobic fermenter, and c...

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Abstract

The invention belongs to the field of solid waste recycling and relates to a method for improving semi-dry fermentation stability of municipal sludge by adding cassava vinasse. The method comprises the following steps: (1) starting fermentation; (2) domesticating strains; and (3) operating an anaerobic reactor. In the invention, a semi-dry process is adopted for treating municipal sludge, the solid containing rate of fermentation materials is enabled to be more than or equal to 12% and less than or equal to 18%, compared with the process for treating municipal sludge by wet type fermentation, the volume of the reactor is reduced by 60-70%, energy consumption, equipment and land occupation are saved; compared with the process for treating municipal sludge by dry type fermentation, the cassava vinasse is added, so the viscosity of the fermentation materials is reduced, the energy consumption of stirring is reduced, and meanwhile, the mass transfer is improved, the carbon nitrogen ratio of materials is balanced, and the gas production rate is improved. According to the method, fermentation sludge is used as inoculation material, after the mixture of dehydrated sludge and cassava vinasse is added, alkaline substance is not needed to be added for adjusting the pH value of the reactor.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and relates to a method for improving the stability of urban sludge semi-dry fermentation. Background technique [0002] With the rapid improvement of my country's sewage treatment capacity, the amount of sludge generated has increased significantly. It is estimated that the annual output of wet sludge in my country will soon exceed 30 million tons. According to the latest research data in my country, the current actual treatment and disposal rate of sludge is even less than 30%. This will seriously affect the effect of my country's construction of urban sewage treatment plants to reduce water pollutants. These sludge may cause secondary pollution to groundwater and soil, and become a threat to environmental safety and public health. my country's energy structure has been dominated by coal and oil for a long time, the contradiction between energy supply and demand has become increasingly pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCY02E50/30
Inventor 周玲玲张永吉戴晓虎
Owner TONGJI UNIV
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