Quick biological drying method for household garbage

Abstract

The invention relates to a quick biological drying method for household garbage. The method comprises the following steps of: uniformly mixing the household garbage from which large impurities are screened out, a biological drying product of the garbage and broken straw, and stacking the mixture in a groove-type compost reactor; covering bundled straw cushions on the garbage surface; supplying enough oxygen to aerobic microorganisms by a timed ventilation method; and after the temperature of the stack reaches a high-temperature section (more than 55 DEG C), adopting a stack temperature feedback ventilation method to evaporate moisture by fully using heat generated by metabolism of the aerobic microorganisms, and bringing out steam by using sufficient ventilation flow to realize quick drying of the garbage. The dried garbage is separated and recycled or transported to an incineration plant for energy recovery. The method improves a lower heat value of the dried garbage by 100 percent and a separation rate by 140 percent, obviously improves household garbage incineration and separation recycling values, and can be widely applied to drying treatment of household garbage which contains 65 to 50 percent of moisture and in which biodegradable organisms account for 50 to 35 weight percent of dry matters.

Description

technical field [0001] The invention discloses a method for rapid biological drying of domestic waste, which relates to a treatment process for water removal and partial biological stabilization of domestic waste, 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, which is greater than 55% on average, and even as high as 75% in some cases. High water content is the main obstacle to the effective treatment of domestic waste. High water content will significantly increase the amount of leachate produced in domestic waste landfills; high water content reduces the low calorific value of domestic waste and reduces the efficiency of incineration energy recovery; high water content It also makes the mutual adhesion of different components in the garbage serious, and the mechanical sortability is poor, which hinders the improvement of the sorting e...

AI Technical Summary

Problems solved by technology

[0005] Nevertheless, the existing domestic waste biological drying technology generally exceeds 15 days (Zhang D.Q., He P.J., Jin T.F., Shao L.M. Bio-drying of municipal solid waste with high water content byaeration procedures regulation and inoculation.Bioresour.Technol. , 2008, 99: 8796-8802), and at the same time, odorous tail gas will be released during the treatment process, which will cause serious secondary pollution, easily cause conflicts with residents around the facility, and limit the application of biological drying technology