Method for matter and phase divided resource recovery of sludge

Abstract

The invention relates to a method for matter and phase divided resource recovery of sludge. The invention creatively proposes a method of "two-stage high solid-content thermal hydrolysis+synchronous solid-liquid separation+efficient methane production by liquid / solid dry anaerobic fermentation+land utilization". Compared with the prior art, the method provided by the invention can effectively realize degradable organic matter and hardly degradable organic matter divided and solid-liquid phase divided high efficiency treatment in sludge, organic matter-rich thermal hydrolysate is subjected to anaerobic digestion by a two-stage UASB high-efficiency anaerobic reactor, the residence time is greatly shortened, the volume of a digestion tank is obviously reduced, and the conversion efficiency oforganic matter anaerobic digestion is significantly improved. At the same time, thermal-hydrolyzed sludge high dryness dehydration can be realized without adding chemicals under a high temperature condition, the filter cake dehydration performance and quality are both significantly improved, the energy consumption and material consumption level of the sludge treatment and disposal process can besignificantly reduced, finally, the dehydrated sludge cake makes use of the afterheat of itself for dry anaerobic fermentation to recover biogas energy and realize sludge cake stabilization, and the discharged material is applied to land utilization.

Description

technical field

[0001] The invention belongs to the technical field of sewage sludge treatment, and in particular relates to a method for realizing sludge material and phase separation and resource recovery. Background technique

[0002] With the development of my country's urbanization and sewage treatment, the sludge output has reached 43 million tons per year (calculated with a moisture content of 80%). Sludge, on the other hand, gathers 60% of COD, 40% of N and 90% of P in sewage, which is rich in energy and resources, but it is also a pollutant. If the sludge is not treated safely and effectively, the emission reduction target of sewage treatment will be greatly reduced. Discount. And with the depletion of global P resources, people are paying more and more attention to the recovery of P resources in sludge.

[0003] Anaerobic digestion is the mainstream technology for sludge treatment and disposal in the world because it can stabilize and reduce sludge and realize bi...

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