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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  • 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 anaero

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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

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[0040] Example 1

[0041] (1) Single-stage alkaline hydrolysis operation process: Inject X volume of pretreated surplus sludge into the reactor, adjust the pH to 13.0 with 10 M sodium hydroxide solution while stirring at 150 rpm, and stir to react 1h, to maximize the release of the organic matter in the sludge into the water phase to achieve the liquefaction of the organic matter, which is alkaline hydrolysis sludge. by figure 2 It can be seen that in the range of pH 10.0-13.5, as the pH increases, SCOD increases continuously, indicating that more organic matter is released into the water phase, and the effect is very significant; but considering that the SCOD increases slowly after pH 13.0, and what is needed at this time The amount of sodium hydroxide added increased sharply, and the optimum pH condition was 13.0.

[0042] (2) Directly inject 2.5X volume of pretreated surplus sludge into the alkali hydrolyzed sludge to mix, and continue to stir and react for 1 hour to reduce th...

Example Embodiment

[0046] Example 2

[0047] (1) The secondary alkaline hydrolysis operation process is as follows figure 1 As shown, in the first-stage alkaline hydrolysis reactor A, X volume of the pretreatment surplus sludge 1 is injected, stirred at 150 rpm, and the alkaline hydrolysis reaction is performed for 1 hour, so that the pH is controlled at about 8.5. Then the supernatant is discharged by centrifugation, that is, the first-stage alkaline hydrolysis water 6 is discharged out of the system; the residue after centrifugation, namely 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 150 rpm, and continue the alkaline hydrolysis reaction for 1 hour to maximize the release of organic matter into the water Phase to achieve the liquefaction of organic matter in the remaining sludge...

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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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