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Method for fast producing methane by utilizing excess sludge

A technology for excess sludge and methane production, which is applied in the field of water treatment, can solve the problems of low gas production, large investment, and unstable gas production in anaerobic digestion of excess sludge, and is beneficial to engineering applications, small in size, and economical The effect of potion consumption

Active Publication Date: 2014-04-09
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The invention aims to solve the problems of low gas production, unstable gas production and large investment in anaerobic digestion of surplus sludge in my country, and provides a method for rapidly producing methane by utilizing surplus sludge

Method used

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  • Method for fast producing methane by utilizing excess sludge
  • Method for fast producing methane by utilizing excess sludge
  • Method for fast producing methane by utilizing excess sludge

Examples

Experimental program
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Embodiment 1

[0041] (1) Single-stage alkaline hydrolysis operation process: Inject X volume of pretreated excess sludge into the reactor, while stirring at 150 rpm, add alkali to adjust the pH to 13.0 with 10 M sodium hydroxide solution, and stir to react 1h, the organic matter in the sludge is released to the water phase to the maximum extent, and the liquefaction of the organic matter is realized, which is alkaline hydrolysis sludge. Depend on figure 2 It can be seen that in the range of pH 10.0-13.5, as the pH increases, SCOD continues to increase, indicating that more organic matter is released into the water phase, and the effect is very significant; but considering that SCOD increases slowly after pH 13.0, and the required The amount of sodium hydroxide added increased sharply, and the more suitable pH condition was selected as 13.0.

[0042] (2) Inject 2.5X volume of pretreated residual sludge directly into the alkaline hydrolysis sludge and mix, continue to stir and react for 1 h...

Embodiment 2

[0047] (1) The operation process of secondary alkaline hydrolysis is as follows: figure 1 As shown, in the first-stage alkaline hydrolysis reactor A, inject X volume of pretreated excess sludge 1, stir at 150 rpm, and perform alkaline hydrolysis reaction for 1 hour to control the pH at about 8.5. Then centrifuge to discharge the supernatant, that is, the first-stage alkaline hydrolysis effluent 6, and discharge the system; the residue after centrifugation, that is, the first-stage alkaline hydrolysis residue 2, is injected into the second-stage alkaline hydrolysis reactor. In the second-stage alkaline hydrolysis reactor B, inject 2 / 7X volume of water, adjust the pH to 13.0 with 10M sodium hydroxide solution while stirring at 150rpm, and continue the alkaline hydrolysis reaction for 1 hour, so that the organic matter can be released to the water to the greatest extent phase to realize the liquefaction of organic matter in excess sludge. Then centrifuge to obtain the supernata...

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Abstract

The invention discloses a method for fast producing methane by utilizing excess sludge, specifically comprising the steps of: (1) pretreating excess sludge; (2) alkaline hydrolysis: releasing organic matters in the excess sludge into a water phase through adopting a single-stage alkaline hydrolysis or a two-stage alkaline hydrolysis, wherein the SCOD (Soluble Chemical Oxygen Demand) of the water phase achieves 2000-10000mg / L. (3) production of methane through anaerobic digestion: inoculating 10%-60% by volume of anaerobic granular sludge in an anaerobic reactor, controlling the volume load at 0.30-0.75kg COD / (m<3>.d), performing methane production reaction within 72h, wherein the methane production capacity achieves 200-400mLCH4 / gCOD. The method has the advantages that the processes of firstly performing alkaline hydrolysis on the excess sludge so as to enable the organic matters to be liquidified and then performing liquid-state digestion to produce methane are fast to start, short in reaction period, stable in methane productivity, not only can energy be recovered, but also the stabilized treatment of the sludge can be realized, and remarkable and environment benefits can be both achieved.

Description

technical field [0001] The invention relates to a method for rapidly producing methane by using excess sludge, which belongs to the sludge treatment and resource utilization method in the field of water treatment. [0002] Background technique [0003] Petroleum, coal, etc. are non-renewable primary energy sources. The demand of modern industry for these non-renewable fossil energy is increasing day by day. On the one hand, it leads to the depletion of non-renewable fossil energy. On the other hand, the extensive use of fossil energy makes the environment more and more serious. Developing efficient and clean renewable energy and adhering to the route of low-carbon circular sustainable development have become the consensus of all countries in the world and are also research hotspots in the field of scientific research. [0004] With the development of my country's social economy and urbanization, as well as the improvement of people's environmental awareness and the increas...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/30
Inventor 胡勇有李义勇毕薇于子淇熊旭华
Owner SOUTH CHINA UNIV OF TECH
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