Method for reducing sludge by adopting ultrasound-magnetic field coupling to disrupt sludge

Abstract

The invention belongs to the field of solid waste treatment and relates to a method for reducing sludge by adopting ultrasound-magnetic field coupling to disrupt sludge. The method comprises the following units: an aerobic biochemical unit is to remove organic pollutants through microbes in a biochemical tank; a sedimentation unit is to separate mud from water in a sedimentation tank; an ultrasound- magnetic field treatment unit is to disrupt rest of sludge by adopting ultrasonic wave and a magnetic filed to cooperate for more than 1 minute, wherein the frequency of the ultrasonic wave is 16-200kHz, the density of sound energy is 0.1-1.0W / mL, and the magnetic field strength is 300-20000Gs; an anaerobic digestion unit is to anaerobically digest the sludge in a digestion tank; and a sludge dehydration unit is to carry out solid-liquid separation by adopting centrifugal dehydration. The method greatly reduces the sludge disruption energy consumption, and the sludge is reduced by more than 80 percent when aerobic digestion is carried out to disrupt the sludge; in anaerobic digestion, the digestion time is reduced by more than 60 percent, the methane yield is increased by more than 35 percent, the sludge is reduced by more than 30 percent. The method has obvious economic benefits, thereby having popularization and application value.

Description

technical field

[0001] The invention belongs to the field of solid waste treatment, and relates to a method of synergistically cracking sludge by ultrasonic technology and magnetic field technology, and the sludge after cracking is returned to an aerobic biochemical tank or flows into an anaerobic digestion tank, thereby realizing sludge reduction method. Background technique

[0002] With the development of industry and urbanization, a large amount of sewage (including domestic sewage and industrial wastewater) has been discharged into water bodies, causing huge pollution. Using the activated sludge process to treat sewage will produce a large amount of residual sludge while treating the sewage. It is estimated that the sewage discharge in 2010 will reach 4.40×10 10 m 3 / d, the amount of dry sludge produced is 44.54 million tons, and the sewage discharge in 2020 will reach 5.36×10 10 m 3 / d, the estimated amount of dry sludge produced is 45.42 million tons. Although t...

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