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Method for enhancing dry-process fermentation stability of sludge by adding kitchen waste

A food waste, dry fermentation technology, applied in the field of solid waste recycling, can solve the problems of insufficient methanogenic substrate, high viscosity of reaction substrate, low degree of hydrolysis and acidification, etc., to achieve sufficient mass transfer and save heating energy Consumption, reduce the effect of mixing difficulty

Active Publication Date: 2012-07-04
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 overcome the difficulties in mass transfer, low degree of hydrolysis acidification, insufficient methanogenic substrate, and excessive pH value caused by the high viscosity of the reaction substrate, high TS concentration, and low C / N value in the dry fermentation process of municipal sludge. increase, ammonium salt accumulation, easy to cause gas production inhibition and other problems, provide a method to improve the stability of sludge dry anaerobic fermentation by adding food waste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 20kg of dewatered sludge from sewage plant A, and detect that the TS content is 25%, the organic matter content is 48%, and the C / N ratio is 10.3; put the material into the sludge anaerobic fermentation tank; Drain and dry the kitchen waste, use a food waste disintegrator to crush it into a paste, measure its moisture content to 84%, take 2kg of the crushed waste and add it to the sludge anaerobic fermentation tank; turn on the stirring motor at a speed of 30r / min, and stir The motor runs for 1 hour and stops for 1 hour; start the gas metering, collection device and temperature control device, and control the temperature of the material to 35±1°C; monitor the material pH, gas production and gas composition every 24 hours; The pH value of the fermentation showed a slight decrease first, and then a slow increase trend, from the initial pH value of 7.0 to 6.2, then slowly increased to 7.8, and the gas production increased from the initial 7-15L / d to 20-30L / d. The cont...

Embodiment 2

[0029] Take 20kg of dewatered sludge from sewage plant B, and detect that the TS content is 22%, the organic matter content is 73%, the C / N ratio is 9.5, and the pH is 7.3; put the material into the sludge anaerobic fermentation tank; the moisture content is 50% Drain and dry the left and right kitchen waste, crush it with a food waste shredder until it becomes a paste, and measure its moisture content to 82%. Add 500g of the crushed waste to the sludge anaerobic fermentation tank each time, mix well and then take a sample to measure its pH , when the addition amount is 2.5kg, the measured pH of the mixed material is 6.2, then seal the feed port of the fermentation tank; turn on the stirring motor, the rotating speed is 30r / min, and the stirring motor runs for 1h / stop for 1h; start the gas metering, collecting device and Temperature control device to control the temperature of the material at 35±1°C; monitor the material pH, gas production and gas production components every 24...

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Abstract

The invention relates to a method for enhancing dry-process fermentation stability of sludge by adding kitchen waste, belonging to the field of solid waste recycling. The invention can solves the problems of low acidifying degree of hydrolysis, insufficient substrates for producing methane, overhigh pH value, ammonium salt accumulation, inhibition of gas generation and the like caused by high viscosity of dewatered sludge, high TS concentration, low C / N value and the like. The method comprises the following steps: pulverizing kitchen waste, mixing the kitchen waste and dewatered sludge in theweight ratio of 1:10-15, putting the mixture in a fermentation tank to ferment, and sufficiently stirring, wherein in the fermentation process, the temperature of the materials is kept at 35+ / -1 DEG C, and the oxidation-reduction potential is smaller than or equal to -300mV; when the pH value rises to 7.5 and the methane content rises to higher than 35%, adding the kitchen waste into the fermentation tank again in batches, wherein the addition amount of the kitchen waste each time accounts for 5-10 wt% of the dewatered sludge, the pH value of the mixed materials is preferably greater than or equal to 6.6, and the preferable addition time is when the pH value of the materials rises to higher than 7.5; and when the methane content is lower than 35% and the gas generation rate obviously decreases, finishing the fermentation. The invention can be used for municipal sludge recycling and energy recovery. Compared with wet fermentation, the invention can save equipment investment and soil occupation.

Description

technical field [0001] The invention belongs to the field of solid waste recycling, and in particular relates to a method for improving the stability of sludge dry fermentation by adding kitchen waste. Background technique [0002] The amount of dewatered sludge produced by urban sewage treatment plants due to the purification of domestic sewage is huge. At present, the annual collection capacity is about 26 million tons. The treatment and disposal of sludge in sewage treatment plants mostly use concentration and dehydration followed by landfill. This method not only occupies limited land resources, but also easily causes secondary pollution. In addition, the resource utilization rate of landfill is low, which does not conform to the principle of sustainable development in my country. In recent years, the global energy structure is undergoing a transition from fossil energy-based to the coexistence of multiple energy sources, and issues such as food security and env...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/04C05F5/00
CPCY02E50/343Y02A40/20Y02E50/30Y02W30/40
Inventor 董滨段妮娜何群彪戴晓虎
Owner TONGJI UNIV
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