Method for drying sludge by residual heat from boiler fume

Abstract

The method of utilizing boiler fume afterheat in drying sludge is to dry sludge from sewage works at low temperature condition with boiler fume afterheat in a two-section or three-section process and to form hard sludge pellets one 1-6 mm size. The sludge pellets may be used as the auxiliary fuel for boiler and in baking light brick and cement product. The present invention has low cost and opens one way of utilizing waste in treating waste. The present invention results in high environment utility, economic utility and social utility.

Description

technical field

[0001] The invention relates to a method for drying sludge by using waste heat of boiler flue gas. Background technique

[0002] Urban domestic sewage and industrial wastewater are treated by sewage treatment plants and can only be discharged after reaching the national sewage discharge standards. This is an environmental engineering measure that must be carried out to protect the ecological environment. Urban domestic sewage and industrial wastewater enter the sewage treatment plant through the sewage pipe network system. During the purification process, most of the pollutants in the sewage are transferred to the sludge, which makes the sludge produced by the sewage treatment plant have a large amount. , and is rich in high-concentration pollutants and heavy metals. Therefore, if these sludges are not properly treated, they will cause serious secondary pollution to the environment.

[0003] The urban sewage treatment system includes two parts: water treatme...