Production method for burning environment-friendly sintered bricks by using sludge from printing and dyeing sewage treatment plant

Abstract

The invention discloses a production method for burning environment-friendly sintered bricks by using sludge from a printing and dyeing sewage treatment plant. The method mainly includes the steps ofsludge drying, smashing and uniform mixing, ageing, manufacturing of green bricks by heat preservation, curing and roasting. Due to the high organic matter content of the sludge, according to the method, a function of a pore-forming agent is achieved during high-temperature roasting, obtained sludge bricks are light, insulate heat, absorb sound and reduce noise and are ecological environment-friendly bricks with excellent performances. The use of the sludge for the preparation of building bricks can effectively achieve economic, environmental and social benefits of sludge disposal. High-temperature roasting can convert heavy metals into insoluble or completely fixe the heavy metals in the lattices of bricks, thereby minimizing the potential hazards of the sludge to the environment.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, disposal and resource utilization, and in particular relates to a production method for firing environmentally friendly sintered bricks from the sludge of a printing and dyeing sewage treatment plant. Background technique [0002] The textile industry is one of the important national industries in our country. Under the conditions of contemporary economic globalization and new technological revolution, our country is entering a period from a large textile country to a textile power. The wastewater generated by the printing and dyeing industry accounts for about 1 / 10 of the total industrial wastewater discharge. According to incomplete statistics, there are about 7.2x10 8 m 3 The discharge of printing and dyeing wastewater into the water environment is one of the most important sources of water pollution. At present, the treatment method of printing and dyeing wastewater is genera...

AI Technical Summary

Problems solved by technology

At present, the treatment method of printing and dyeing wastewater is generally based on the biological method, and the biological method has a better treatment effect, but at the same time it will produce a large amount of excess sludge, which accounts for about 0.5% of the treated water (with a water content of 97 %); in sewage treatment plants, the cost of sludge treatment accounts for about 20%-50% or even as high as 70% of the total operating cost, which makes textile printing and dyeing enterprises need to invest too much money in this area, but they may not necessarily achieve better results. Treatment effect, which has become an important factor restricting the development of the textile industry