Device and method for improving dewatering efficiency of activated sludge by using biomass ash

Abstract

The invention provides a device for improving the dewatering efficiency of activated sludge by using biomass ash. The device includes a sludge pipeline, a flocculant inlet pipe, a sludge dynamic mixer, a mud distributor, two scraper blades, a biomass ash distribution box, a double screw belt distributor, three sludge agitators, a porous pressure roller dewatering device, a net head return roller,a net portion active roller, a first filter screen, a water receiving tray, a first scraping plate and a high pressure dewatering device. According to the device, by adding the biomass ash, the biomass ash is mixed with the sludge, so that combined water in the sludge becomes free water, the difficulty of sludge dewatering is reduced, the sludge dryness can be increased to 35-40%, the cost of sludge transportation is reduced, and the by-product biomass ash produced by a biomass power plant is comprehensively utilized. The invention also provides a method for improving the dewatering efficiencyof the activated sludge by using the biomass ash.

Description

technical field [0001] The invention relates to the technical field of muddy water treatment, in particular to a device and method for improving the dewatering efficiency of activated sludge by using biomass ash. Background technique [0002] The conventional dehydration process of excess activated sludge in urban domestic sewage treatment plants is "excess sludge - sedimentation tank - adding flocculant (polyacrylamide) before dehydration - water content above 99%, polyacrylamide has a high molecular weight , Different ion degrees, fixed and adsorbed unstable particles on the molecular chain, so under the action of the flocculant, the sludge particles in the water gradually increase, forming trap flocs, the formation of flocs will lead to the separation of mud and water, Easy to remove moisture from mud. [0003] The activated sludge of urban domestic sewage treatment plants is firstly added with polyacrylamide to flocculate the small molecular sludge into macromolecular s...

AI Technical Summary

Problems solved by technology

[0003] The activated sludge of urban domestic sewage treatment plants is firstly added with polyacrylamide to flocculate the small molecular sludge into macromolecular sludge, and the free water in the sludge is removed by gravity. After a large amount of sewage is removed, the sludge After the fluidity is reduced, it creates conditions for the sludge to enter the pressure dehydration, but at this time the water in the sludge exists as bound water, which is very difficult to remove, and the dryness only reaches 15%. If you want to further reduce the water content, Requires heat to resolve

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