Method and device for comprehensively treating sludge generated by sewage treatment plant and kitchen waste oil

Abstract

The invention relates to a method for comprehensively treating sludge generated by a sewage treatment plant and kitchen waste oil, which comprises the following steps of: (1) sludge formation; (2) frying dehydration; (3) burning and heat exchange; (4) tail gas processing; and (5) slag collection. The invention also relates to a comprehensive treatment device which consists of a sludge forming unit, a frying and drying unit, a burning unit, a heat exchange unit, a solid slag processing unit and a waste gas processing unit. A discharge port of the sludge forming unit is connected to a feed inlet of the frying and drying unit; a discharge port of the frying and drying unit is connected with a feed inlet of the burning unit; a slag outlet of the burning unit is connected to a slag inlet of the solid slag processing unit; a high temperature flue gas exhaust port of the burning unit is connected with the heat exchange unit; the heat exchange unit is connected to a heating chamber of the frying and drying unit; and the frying and drying unit and a waste gas exhaust port of the heat exchange unit are connected to the waste gas processing unit. According to the method and device provided by the invention, the resource recovery, the reduction and the harmless treatment of two types of wastes in towns, i.e. the kitchen waste oil and the sludge generated by the sewage treatment plant, can be implemented.

Description

technical field [0001] The invention belongs to the field of sludge treatment and resource utilization equipment, and in particular relates to a comprehensive treatment method and device for sewage treatment plant sludge and kitchen waste oil. Background technique [0002] Sludge is a solid waste produced by municipal sewage treatment, which contains a large amount of organic matter and pathogenic bacteria and other bacterial groups. If it is not handled properly, it will easily have an important impact on the urban environment and residents' health. By the end of 2009, there were 3,134 urban sewage treatment plants nationwide, with a total treatment capacity of 111.6 million cubic meters per day, and 21.24 million tons of sludge with a moisture content of 80% per year. In 2015, the amount of urban sludge in my country is expected to reach 31.43 million tons per year. Therefore, the safe and standardized treatment and disposal of urban sludge to achieve sludge reduction, ha...

AI Technical Summary

Problems solved by technology

There are two disadvantages in hot air drying of sludge: 1) It is easy to generate dust

(2) Explosion hazard

Therefore, the complexity of sludge drying operation and the total investment in equipment are increased

2) Hot air drying uses a large amount of hot air, which consumes a lot of heat, resulting in low thermal efficiency in the sludge drying process

Vacuum drying requires a vacuum device, which increases operational complexity and equipment costs; in addition, vacuuming will consume a lot of energy and increase sludge treatment costs

2. The sludge drying process uses an external steam heat source, which also increases the cost of sludge treatment

Images