Device and method for producing biogas by distillers' grain fermentation

Abstract

The invention discloses a device and a method for producing biogas by distillers' grain fermentation. The device comprises a mixing tank, a circulating pump, a reaction tank and a return pipe, wherein the mixing tank, the circulating pump and the reaction tank are sequentially connected through a pipeline, and the reaction tank is connected with the mixing tank through the return pipe. The reaction tank is provided with a water distributor, a first reaction chamber, a primary three-phase separator, a second reaction chamber, a secondary three-phase separator, a flow guide pipe, a drain port and an exhaust port, and the mixing tank is provided with a heating device, an emptying port, a stirrer and a feed port. The method for producing the biogas by distillers' grain fermentation includes the steps: 1) preliminarily fermenting distillers' grain wastewater in the mixing tank; 2) performing two-stage anaerobic fermentation treatment for the distillers' grain wastewater in the reaction tank. The device is stable in running, easy to control, less in discharged sludge quantity and capable of generating the biogas with the methane content of 60% or more. The device and the method are applicable to treating high-concentration distillers' grain wastewater, less in sludge loss, good in organic matter removing effect and low in running cost.

Description

technical field [0001] The invention relates to a device and method for fermenting distiller's grains to produce biogas. Background technique [0002] Circular economy is the optimal model in the process of human economic development. It has changed the linear development model of the traditional economy and presented a feedback closed-loop process of "resources-products-renewable resources". Minimum resource and environmental costs, maximum economic and social benefits. [0003] Liquor is a large profit and tax household in my country, and the total annual profit and tax paid by the industry can reach more than 100 billion yuan. In recent years, the production of liquor has been continuously expanding, and the amount of distiller's grains has also increased sharply. The amount of distiller's grains produced every year is about 98.66 million tons. The comprehensive utilization of distiller's grains can not only reduce environmental pollution, but also generate economic ben...

AI Technical Summary

Problems solved by technology

The UASB reactor has a simple structure, low operating costs, and high treatment efficiency, but its operating conditions and control requirements are high, and it is prone to blockage and short flow when treating wastewater with a high concentration of suspended solids, and the treatment efficiency is too low under low temperature and low concentration conditions. , Sludge loss is easy to occur when the load is high, it takes a long time for the initial start-up and the formation of stable granular sludge, it is sensitive to sudden changes in water quality and load, and has poor impact load resistance; EGSB reactor has a high volume load and height-to-diameter ratio , simple operation, energy saving, strong impact load resistance, pH buffer capacity, and good water stability, but its operating conditions and control requirements are relatively high, because suspended solids will quickly be absorbed by the water when they pass through the granular sludge bed. Flush out, it is difficult to degrade, so it is not suitable for treating waste water with high solid content; ABR reactor has good buffering ability for impact load and toxic substances in influent, no short flow, no clogging, no need for stirring, It is easy to start, but it is difficult to achieve uniform water distribution, and it is easy to produce channel flow and dead ends. It has high requirements for the activated sludge in operation. It is necessary to cultivate granular anaerobic sludge from inoculated and acclimated sludge to start operation; IC reactor occupies Less land, high volume load, strong impact resistance, strong low temperature resistance, pH buffering capacity, good effluent stability, short start-up period, simple operation and management, suitable for treating high-concentration organic wastewater, but muddy water in its internal circulation The riser and return pipe of the mixed solution are easily blocked, causing paralysis of the internal circulation and affecting the removal effect of insoluble organic matter

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