Method for deep dehydration of residual activated sludge

Abstract

The invention relates to a method for deep dehydration of residual activated sludge, particularly to a novel technique for realizing deep dehydration of residual activated sludge by applying waste organic acid mother liquor. The method is as follows: collecting the residual activated sludge which is dehydrated mechanically, adding 20-50% of waste organic acid mother liquor based on weight of the residual activated sludge, mixing the mixture to be slurry, putting the slurry into a reaction kettle and heating to 60-100 DEG C for reaction for 0.5-5h, during which the living biological substancescontained in the sludge are decomposed, the protein denatures and the bound water in the sludge changes to be free water and exudes; and after the reaction is finished, transferring the resultants into a mixing pool, adding plant debris and the like which serve as fillers, when the mixture turns to be thick catsup, putting the mixing pool into a drying device, and drying until the water content is 10-20wt% to get dry sludge. After heavy metal content detection, the dry sludge can be classified into different grades to be used as compost for farmers or to be as fuel for fuel suppliers. The invention solves the problems that due to high water content, the residual activated sludge is difficult to be effectively used in the prior art, and the method is suitable for large-scale intensive treatment and reclamation of residual activated sludge.

Description

Technical field:

[0001] The invention relates to a method for deep dehydration of excess activated sludge, in particular to a new process for realizing deep dehydration of excess activated sludge by using waste organic acid mother liquor. Background technique:

[0002] Activated sludge is a general term for microbial groups and the organic and inorganic substances they are attached to. Microbial groups mainly include bacteria, protozoa and algae. Among them, bacteria and protozoa are the two main categories. Activated sludge is mainly used to treat sewage and wastewater, which is an aerobic biological treatment method. The basic concept of activated sludge was discovered by the British Clark and Cage in 1912 that long-term aeration of wastewater would produce sludge and significantly improve the water quality. After further research, Arden and Lackett found that because the experimental container was not cleaned, the bottle wall Leaving residue on the contrary improves the...

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