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Method for matter and phase divided resource recovery of sludge

A technology of resource recovery and sludge, applied in sludge treatment, biological sludge treatment, pyrolysis treatment of sludge, etc., can solve the problem of insufficient sludge carbon source and resource recovery, large volume of mixed digestion reactor, and sludge weariness. Oxygen digestion efficiency is low and other problems, to achieve the effect of saving heating energy consumption, shortening residence time, and reducing volume

Active Publication Date: 2018-08-21
TONGJI UNIV
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  • Description
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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for realizing sludge material and phase separation resource recovery in order to overcome the above-mentioned defects in the prior art, and solve the problem of low efficiency of traditional sludge anaerobic digestion, especially low organic matter sludge anaerobic efficiency Problems such as low conversion rate, large volume of solid-liquid mixed digestion reactor for thermally hydrolyzed sludge, insufficient carbon source and resource recovery in sludge, etc.

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  • Method for matter and phase divided resource recovery of sludge

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specific Embodiment approach

[0036] The specific implementation method is: the dewatered sludge with a solid content rate of 15-30% in the sewage plant first utilizes hydrolysis to release steam and heat exchange to recover energy to preheat the dewatered sludge to obtain pulped sludge (80-30%) 90°C), after slurry treatment, the sludge viscosity was significantly reduced. The pulped sludge is then pumped into the first-level thermal hydrolysis pretreatment system (160-165°C, 10-30min) for the first-level thermal hydrolysis pretreatment to form the first-level thermal hydrolysis sludge, which promotes the synthesis of proteins in the sludge flocs. A large amount of organic matter such as polysaccharides is dissolved, and then heat exchange treatment is performed. After the temperature of the first-level thermal hydrolysis sludge drops to 80-90°C, the thermal hydrolysis sludge is solid-liquid treated by direct centrifugation without adding chemicals. Separation to form primary dewatered cake and primary the...

Embodiment 1

[0040] The solid content TS of dewatered sludge in urban sewage treatment plants is 18%, VS / TS is about 70%, and diluted with water to a solid content rate of 15%, hot water can be decompressed and steam can heat the feed sludge to about 85°C. After 2 hours of slurry treatment, the viscosity of the sludge can be reduced to less than 1 / 10 of the original sludge. The slurry sludge enters the first-stage thermal hydrolysis reactor. The thermal hydrolysis temperature is 160°C, and the time is 30 minutes. The temperature of the thermal hydrolysis sludge is reduced. Centrifugal dehydration is carried out directly without adding drugs at 80°C, the solid content of the mud cake is about 30%, and the SCOD of the first-grade thermal hydrolyzate can reach 70000mg / L. Adding water to the dehydrated cake is crushed by high-speed stirring, the crushing speed is about 30,000rpm, and the slurry is treated with thermal hydrolysis steam. The solid content of the pulped sludge is about 20%. The t...

Embodiment 2

[0042] The solid content TS of the dewatered sludge of the urban sewage treatment plant is 22%, and the VS / TS is about 55%. It is diluted with water to a solid content rate of 16%. The hot water can be used to decompress the steam to heat the feed sludge to about 85°C. After 2 hours of slurry treatment, the viscosity of the sludge can be reduced to less than 1 / 10 of the original sludge. The slurry sludge enters the first-stage thermal hydrolysis reactor. The thermal hydrolysis temperature is 160°C, and the time is 30 minutes. The temperature of the thermal hydrolysis sludge is reduced. Centrifugal dehydration is carried out directly without adding drugs at 80°C, the solid content of the mud cake is 35%, and the SCOD of the first-grade thermal hydrolyzate can reach 45000mg / L. Adding water to the dehydrated cake is crushed by high-speed stirring, the crushing speed is about 30,000rpm, and the slurry is treated with thermal hydrolysis steam. The solid content of the pulped sludge ...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/10C02F11/12C02F3/28C05F7/00
CPCC02F3/2846C02F11/04C02F11/10C02F11/122C02F11/127C05F7/00Y02E50/30Y02A40/20
Inventor 戴翎翎杨东海戴晓虎
Owner TONGJI UNIV
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