Sludge fuelization treatment process of urban sewage treatment plant

Abstract

The invention discloses a sludge fuelization treatment process of an urban sewage treatment plant, and provides a sludge treatment technology which can substantially reduce the energy consumption of a sludge fuel production technology, shorten the required time of the treatment process and greatly reduce the cost. The invention has the technical scheme that the dehydrated sludge in the urban sewage treatment plant is subjected to a step of chemical and physical conditioning, a step of microwave radiation conditioning, a step of press filtration and dehydration, a step of granulation, a step of microwave heating for drying in order to obtain the sludge fuel with water content being 5-10% and lower calorific value being 4000-5000 kilocalorie. The invention is characterized in that the sludge is subjected to the step of chemical and physical conditioning and the step of microwave radiation conditioning, thereby the mechanical dewatering performance of the sludge can be substantially improved, the required press filtration time accounts for about 30% of the conventional press filtration dehydrated time; the method of microwave heating for drying is employed, the required time of sludge drying process is substantially shortened in only 30-45 minutes, so that the energy consumption in the drying process is reduced by 40%.

Description

technical field [0001] The invention relates to a treatment process for making fuel by using surplus sludge of urban sewage treatment plants as raw materials, in particular to a treatment process for sludge fuelization of urban sewage treatment plants. Background technique [0002] The treatment of urban sewage and most industrial wastewater is now treated with activated sludge process technology. The sewage (wastewater) is discharged up to the standard after treatment, and the main by-product - sludge must also be treated as necessary. processing. [0003] Sludge is an extremely complex heterogeneous body composed of organic debris, bacterial cells, colloids, various microorganisms, and organic and inorganic particles. It is characterized by high moisture content (95% ~ 98%), high content of organic matter in dry matter (60% ~ 80%), and contains viruses, pathogenic bacteria, heavy metals, etc., and is easy to rot and smell. [0004] At present, my country's urban sewage t...

AI Technical Summary

Problems solved by technology

M. Bux et al. tested the drying of municipal fermented sludge with a fully automated solar drying device. This device only consumes 22-28 (kWh) of electricity per 1 ton of sludge moisture, while drying with traditional drying methods consumes only 22-28 kWh. Need to consume 70~110( kW h) of electric energy

Images