Method for improving volume of production of corn straw biogas with sodium hydroxide wet-type solid state treatment at normal temperature

Abstract

The invention relates to a method for improving the yield of corn stalk biogas through sodium hydroxide wet type solid normal temperature treatment, which belongs to the field of biomass energy. The liquid chemical pretreatment and the solid chemical pretreatment of corn stalks have the problems of higher use amount of NaOH, high cost and the like. The method is that sodium hydroxide with the amount of 2 percent of the dry weight of the corn stalks, water with the amount of 7.5 times of the weight of the corn stalks and crashed corn stalks are fully mixed evenly, are sealed for preservation for 3 days after reaching the water saturation state, then are discharged and added with pig manure digestive liquid to undergo the anaerobic digestion and produce biogas. The invention has the advantages that the cost is saved, the pretreatment time is reduced, the gas yield is improved and the like.

Description

technical field [0001] The invention belongs to the field of biomass energy, and in particular relates to a method for producing biogas through anaerobic digestion of corn stalks, in particular to a method for increasing the biogas output of corn stalks by wet solid-state normal temperature treatment with sodium hydroxide. Background technique [0002] my country is the largest agricultural country in the world, producing 700 million tons of various crop straws every year, of which corn straw accounts for 35%. In addition to being partially used as feed, fertilizer, energy for rural life and raw materials for papermaking, a large amount of straw is burned in the open, causing serious air pollution and fires, affecting the safety of transportation, and wasting a lot of resources. [0003] Converting straw into clean energy—biogas through anaerobic digestion technology is an effective way to solve the environmental pollution of agricultural waste and realize resource utilizati...

AI Technical Summary

Problems solved by technology

However, the time for NaOH solid-state normal temperature pretreatment is longer (30 days), and the treatment cost caused by the amount of NaOH (6%-8% in dry weight of straw) is still relatively high compared to the current price of biogas; on the other hand, straw When the moisture content is low, it is not easy to stir evenly, which not only affects the pretreatment effect, but also increases the energy consumption of engineering applications