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Method for enhancing production of methanol by using filter screen structure through anaerobic digestion of municipal sludge

An anaerobic digestion and municipal sludge technology, applied in chemical instruments and methods, biological sludge treatment, water/sludge/sewage treatment, etc., can solve the problems of slow hydrolysis rate and low methane production efficiency, and achieve enhanced oxidation The effect of decomposing, increasing gas production and accelerating methane production rate

Active Publication Date: 2020-02-11
TONGJI UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of application filter structure to strengthen the anaerobic digestion of municipal sludge to produce methane in order to overcome the problems of slow hydrolysis rate and low methane production efficiency in the anaerobic digestion process of municipal sludge existing in the above-mentioned prior art. method, speed up the rate of hydrolysis and acidification, and improve the ratio and efficiency of methane production

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  • Method for enhancing production of methanol by using filter screen structure through anaerobic digestion of municipal sludge
  • Method for enhancing production of methanol by using filter screen structure through anaerobic digestion of municipal sludge
  • Method for enhancing production of methanol by using filter screen structure through anaerobic digestion of municipal sludge

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Embodiment 1

[0036] A method of enhanced anaerobic digestion of municipal sludge for methane production was implemented in batch methanogenesis experiments. Using the residual sludge of the secondary settling tank (VS=51.9%~70.8%, TS=1.8%~5.1%) as the substrate, the anaerobic digestion sludge in the reactor running stably (VS=35.6%~47.9%, TS= 2.5%~5.2%) as inoculum mud, and batch methanogenic experiments were carried out in 500mL serum bottles. For the experimental equipment, see figure 1 , figure 1 For the cross-sectional schematic diagram of the 1-1 section, see figure 2 ,From figure 2 It can be seen from the figure that in this embodiment, four brackets are arranged on the side wall of the serum bottle in the circumferential direction to support the filter screen structure (the shaded part in the figure), the feeding tube is inserted from the upper part of the serum bottle and the feeding port extends into the serum inside the bottle.

[0037] A filter structure with titanium mesh...

Embodiment 2

[0040] A method of enhanced anaerobic digestion of municipal sludge for methane production was implemented in a semi-continuous methane production experiment. Using sludge after gravity concentration (VS=51.9%~70.8%, TS=3.8%~5.1%) as the substrate, anaerobically digested sludge (VS=35.6%~47.9%, TS=2.5 %~5.2%) as inoculum slime, a semi-continuous methane production experiment was carried out in a reactor with a working volume of 2L.

[0041] The reactor of the experimental group was placed at the 0.5L position (near the feed inlet) with a filter structure with titanium mesh as the skeleton and ferric oxide as the coating, while the control group did not place the filter structure. Both the semi-continuous reactors of the experimental group and the control group were fed with 2L of inoculum mud first, with a daily feed of 200mL and a discharge of 200mL, SRT=10d. The reactor is heated by a water bath at 37-55 degrees, and the stirring is stopped for 1 minute every minute, and th...

Embodiment 3

[0044] Implementation of a method for enhanced anaerobic digestion of municipal sludge for methane production in continuous methane production experiments.

[0045] Using the residual sludge of the secondary settling tank (VS=51.9%~70.8%, TS=1.8%~5.1%) as the substrate, the anaerobic digestion sludge in the reactor running stably (VS=35.6%~47.9%, TS= 2.5%~5.2%) as inoculum slime, and the continuous methane production experiment was carried out in a reactor with a working volume of 4L.

[0046] The reactor of the experimental group was placed at the 0.8L position (close to the feed inlet) with a filter structure with titanium mesh as the skeleton and ferric oxide as the coating, while the control group did not place the filter structure. Both the semi-continuous reactors of the experimental group and the control group were fed with 4L inoculum mud first, and started by continuous feeding and discharging, SRT=20d. The reactor is heated by a water bath at 37-55 degrees, and the ...

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Abstract

The invention relates to a method for enhancing production of methanol by using a filter screen structure through anaerobic digestion of municipal sludge. According to the method, the filter screen structure using a titanium or titanium alloy as a framework and ferroferric oxide as a coating is arranged in an anaerobic digestion system, so that the hydrolysis acidification velocity of the sludge is quickened, and the proportion of the methanol in biogas is increased. Compared with the prior art, the method disclosed by the invention has the advantages that through a reticular structure, contact between the ferroferric oxide and anaerobic microorganisms is increased; moreover, due to a stable crystal body structure of the ferroferric oxide, electronic-activity is enriched while persistenceof the ferroferric oxide as an electronic carrier is ensured at the same time; the titanium or titanium alloy served as a material with high strength, high corrosion resistance, high biocompatibilityand high conductivity can be preferably matched with the ferroferric oxide, so that promotion of an electron transferring process can be assisted; and the method disclosed by the invention has the advantages of being low in cost and high in yield; repeated input is not needed, an effect is stable, oxidative decomposition of organic matters in an anaerobic digestion process can be enhanced, the methanol production velocity is quickened, and the gas production rate is increased.

Description

technical field [0001] The invention belongs to the field of urban sludge treatment and organic matter resource utilization, and in particular relates to a method for strengthening anaerobic digestion of urban sludge to produce methane by using a filter screen structure. Background technique [0002] With the rapid improvement of my country's sewage treatment capacity, as of the end of February 2019, more than 5,500 urban sewage treatment plants (excluding township sewage treatment plants and industries) have been built in cities across the country, with a sewage treatment capacity of 204 million cubic meters per day , and the resulting sludge annual output has exceeded 40 million tons (based on a water content of 80%). Anaerobic digestion technology realizes resource recovery while promoting sludge reduction, stabilization, and harmlessness. It has good environmental and economic benefits. It is a promising technology to help cope with climate change and achieve energy conse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F101/30
CPCC02F11/04C02F2101/30Y02E50/30C02F2305/06C02F3/006B01D39/12B01D2239/0492B01D2239/1233C02F11/12
Inventor 戴晓虎李磊许颖董李鹏郑琳珂
Owner TONGJI UNIV
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