Biological drying method for treating urban domestic dewatered sludge

Abstract

The invention relates to a biological drying method for treating urban domestic dewatered sludge, which belongs to the technical field of environmental protection. The method comprises the following steps of: mixing the dewatered sludge with crushed auxiliary materials and feeding the mixture into a fermentation cabin; adding fresh composted sludge from the top of the cabin, enclosing the fermentation cabin for a fermentation reaction, mixing a zymophyte agent special for sludge with the fresh composted sludge and scattering the mixture into the fermentation cabin; uniformly stirring, uniformly ventilating and aerating from the bottom of the cabin, and exhausting air from the top of the fermentation cabin until the central temperature of a compost is between 55 and 65 DEG C; and ventilating from the bottom of the fermentation cabin and inducing air from the top of the fermentation cabin to keep the central temperature of the compost in the fermentation cabin for 3 to 6 days, stirring the compost, maintaining for 2 to 4 days until the water content of the compost is reduced, continually ventilating from the bottom of the fermentation cabin and inducing air from the top of the fermentation cabin, stirring until the water content of the compost is less than 40 percent, and discharging. The dewatered sludge prepared by the method is a harmless and scentless product with a stable property, and can be used as fertilizers, covering soil and the like in agriculture and forestry and landfill yards.

Description

technical field [0001] The invention relates to a biological drying treatment method for urban domestic dewatered sludge, which belongs to the technical field of environmental protection. Background technique [0002] With the rapid progress of urbanization in our country and the country's increasing emphasis on environmental water pollution control year by year, a large number of new sewage treatment plants have been built in my country in recent years to meet the needs of urbanization. However, the ensuing dewatered sludge problem has gradually attracted the attention of the government and the public. Due to the lack of attention paid to the sludge problem in my country, the landfill-based disposal of sludge has caused serious secondary pollution to the environment. The sludge problem has become an unfinished project that is becoming more and more troublesome in my country's water industry. . Because sludge enriches most of the pollutants in sewage, coupled with high mois...

AI Technical Summary

Problems solved by technology

[0005] At present, the main technologies of sludge biological treatment in my country are anaerobic fermentation and aerobic fermentation. Anaerobic aspect has high requirements on facilities and strict requirements on fermentation conditions; although aerobic fermentation is easier to operate, it also has slow heating process and fermentation Too long time, low energy efficiency ratio, and secondary pollution (odor, leachate, etc.)