Method for producing methane by using sludge to regulate fruit and vegetable wastes to reinforce single-phase fermentation

Abstract

The invention discloses a method for producing methane by using sludge to regulate fruit and vegetable wastes to reinforce single-phase fermentation. The method comprises the following steps: smashing the fruit and vegetable wastes, adding the smashed fruit and vegetable wastes into a fermentation reactor, adding the residual condensed sludge with the volatile suspended solid concentration of 13-16 g / L, wherein the weight of the fruit and vegetable wastes is 100 parts and the excess sludge is 5-60 parts, and adding water to get constant volume till the effective volume is 1L; inoculating 10g of anaerobic granular sludge according to per 100mL of fermentation substrate, controlling the pH value to 6.5-8, and controlling the temperature at 35 DEG C and anaerobically stirring for 7-20 days. The residual sludge is added to regulate the substrate nutritional structure, the anaerobic granule sludge is inoculated to regulate the microbes so as to avoid the start failure of the fermentation reaction, and the key technical problems of rapid hydrolytic acidification speed and slow consuming speed of the organic acid by the methanogenesis microbes in the fruit and vegetable wastes single-phase fermentation process are effectively solved; the single-phase fermentation can be stably processed, the substrate solid removing efficiency of the fruit and vegetable wastes single-phase fermentation is increased and the biogas production is increased by at least 3 times, and further the fermentation period is shortened.

Description

technical field [0001] The invention relates to a method for regulating and controlling single-phase fermentation of fruit and vegetable waste to strengthen biogas production by using excess sludge, and belongs to the field of solid waste treatment and comprehensive utilization. Background technique [0002] Due to the adjustment of industrial structure, the intensive planting of fruits and vegetables has developed rapidly, and people's quality requirements for fruits and vegetables have been continuously improved. In the process of listing fruits and vegetables, a large number of fruit and vegetable wastes such as roots, stems, and leaves will be produced, which has become an unavoidable Neglected sources of solid waste pollution. Fruit and vegetable waste has the characteristics of high water content (usually > 80%), rich organic matter and nutrients (75% sugar and hemicellulose, 9% cellulose and 5% lignin) and non-toxicity. It is suitable for anaerobic fermentation to...

AI Technical Summary

Problems solved by technology

Bouallagui et al. (see Journal of Environmental Management, 2009, 90: 1844-1849) found that adding 70% of slaughterhouse wastewater and activated sludge increased biogas production by 51.5% and 43.8%, but there was a long fermentation period (43 days) and low waste utilization rate (VSS removal rate is about 80%) and other issues

This is due to the long generation time of methane bacteria, and the fact that slaughterhouse wastewater and activated sludge carry few methane microorganisms, resulting in a lack of rich methane microbial communities in the system.