Hydrolysis-aerobiosis two-section biological drying method for household garbage

Abstract

The invention discloses a hydrolysis-aerobiosis two-section biological drying method for household garbage and relates to a treatment technique for garbage water removal and partial biological stabilization. The method comprises the following steps of: stacking the household garbage in a groove type composting reactor and performing ventilation at long intervals; neutralizing all the generated percolate until the pH is 6.8 to 7.8; refluxing the percolate to the garbage stack in the groove type composting reactor to perform hydrolysis and drying on the garbage for four days; stopping refluxing the percolate; ventilating for two times every hour and turning for one time every two days to dry the garbage after repeating for twelve days; and removing the dried garbage from the groove type composting reactor for resource utilization or directly burning the dried garbage for energy recovery. After the biological drying process, the water content of the garbage is reduced from over 70 percent to below 45 percent; the lower heat value is increased by more than one time; the efficiency of separation is increased to 80 percent; and the recycling value of the household garbage is obviously increased. The method can be widely applied to drying treatment of the household garbage with the water content over 65 percent and solid waste which is mainly the biologically degradable waste.

Description

technical field [0001] The invention discloses a method for domestic garbage hydrolysis-aerobic two-stage garbage biological drying, which relates to a treatment process for water removal and partial biological stabilization of garbage, and belongs to the technical field of solid waste treatment and resource utilization. Background technique [0002] Domestic waste in my country is characterized by high moisture content. The average moisture content of domestic waste in large and medium-sized cities is 60%, and even as high as 75% in some seasons, which makes the mutual adhesion of different components in the waste serious, and the mechanical sortability is poor, which hinders sorting. The improvement of the effect limits the possibility of optimizing the waste treatment process through sorting. At the same time, high moisture content reduces the low calorific value of domestic waste, reducing the efficiency of incineration energy recovery. In order to improve the resource u...

AI Technical Summary

Problems solved by technology

However, the principle of aerobic biological drying is to drive water evaporation through the biodegradation of organic matter. Therefore, when the ratio of water to organic matter is too high (that is, the water content is too high), the heat generated by the biodegradation of organic matter is not enough to drive water to fully evaporate. , when the moisture content of the garbage is greater than 70%, the moisture content of the aerobic biological drying product is about 50% under the optimal condition, which still has a certain adverse effect on the subsequent sorting (Zhang D.Q., He P.J., Jin T.F., Shao L.M.Bio- drying of municipal solid waste with high water content by aeration procedures regulation and inoculation. Bioresour. Technol., 2008, 99: 8796-8802)