Sludge dewatering integrated process

Abstract

The invention discloses a sludge dewatering integrated process, which is characterized by adopting the following steps: (1), pumping sludge from a secondary sedimentation tank behind an aeration tank into a sludge concentration tank with a sludge lifting pump to concentrate the sludge for 13 to 20 hours so as to reduce volume of the sludge primarily; (2), pumping the sludge subjected to primary volume reduction into a quality-regulating tank with the sludge lifting pump, adding burnt lime in an amount of 1 to 3 percent based on the total weight of the sludge and alkaline industrial waste residue in an amount of 2 to 6 percent based on the total weight of the sludge into the quality-regulating tank, and stirring the mixture at a low speed to regulate quality for 4 to 6 hours; (3), dewatering the sludge subjected to quality regulation with a dewaterer to make sludge cakes; (4), naturally drying the dewatered sludge cakes for about 10 days; and (5), burning the naturally dried sludge cakes into raw materials for preparing cement, processing the naturally dried sludge cakes into raw materials for preparing bricks, processing the naturally dried sludge cakes into autoclaved geotechnical engineering materials or curing the naturally dried sludge cakes into daily covering materials for refuse landfills. The process of the invention has the advantages of effectively reducing water content of sludge, along with low processing cost.

Description

technical field [0001] The invention relates to a sludge dewatering process, more specifically to an integrated sludge dewatering process with low treatment cost and capable of effectively reducing the water content of sludge. Background technique [0002] Sludge treatment and disposal is a new problem in the process of sewage treatment. First of all, sludge contains a large number of toxic and harmful substances, such as parasite eggs, pathogenic microorganisms, bacteria, synthetic organic matter, and heavy metal ions such as mercury, chromium, cadmium, lead, copper, zinc, etc., which have adverse effects on the surrounding environment; Secondly, the amount of sludge is large, and its amount accounts for 0.3-0.5% (volume) of the total treated sewage. If advanced treatment is carried out, the amount of sludge may increase by 0.5-1.0 times. These sludges must be treated and disposed of in time to prevent secondary pollution. Sludge treatment and disposal mainly solve the pr...

AI Technical Summary

Problems solved by technology

[0007] (1) Lime stabilization method uses lime to increase the pH of sludge to 11-11.5, and uses strong alkalinity and a large amount of heat energy released by lime to kill pathogens, reduce odor and passivate heavy metals. The amount of slag produced by lime milk is large, which will Increase the volume of residual sludge that is not easy to handle;

[0008] (2) Chlorine stabilization method Chlorine can kill germs and has long-term stability, but the pH is low and the filterability is poor, and toxic chloramines often occur during the chlorination process, which brings certain difficulties to subsequent disposal.