Apparatus and method for producing acetic acid through alkaline fermentation of residual sludge which is reinforced by pretreatment of strong base

A technology of excess sludge and alkali pretreatment, which is applied in the directions of biomass pretreatment, biochemical cleaning devices, biochemical equipment and methods, etc., can solve the problems of low acetic acid production and achieve the effect of increasing acetic acid production

Active Publication Date: 2015-04-08
BEIJING UNIV OF TECH
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Problems solved by technology

[0005] Aiming at the problem that the amount of acetic acid produced by fermentation of excess sludge under alkaline conditions is low, the present invention proposes a device and method for strong alkali pretreatment to strengthen the production of acetic acid by alkaline fermentation of excess sludge
With the help of two SBR devices, this method changes the traditio...

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  • Apparatus and method for producing acetic acid through alkaline fermentation of residual sludge which is reinforced by pretreatment of strong base
  • Apparatus and method for producing acetic acid through alkaline fermentation of residual sludge which is reinforced by pretreatment of strong base

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Embodiment Construction

[0023] Below in conjunction with accompanying drawing and embodiment the present invention will be further described: as figure 1 As shown, a strong alkali pretreatment device and method for strengthening the alkaline fermentation of excess sludge to produce acetic acid is characterized in that it is equipped with a fermentation SBR1, a pretreatment SBR2, a fermentation sludge pump 3, a fermentation alkali pump 4, and a pretreatment discharge pump. Sludge pump 5, pretreatment alkali pump 6, pretreatment mud inlet pump 7, fermentation pH meter 8, fermentation pH probe 9, pretreatment pH meter 10, pretreatment pH probe 11, fermentation mud discharge box 12, fermentation agitator 13. NaOH medicine box 14, excess sludge tank 15, magnetic stirrer 16, fermentation heating rod 17, pretreatment heating rod 18, fermentation acid pump 19 and HCl medicine box 20. The bottom of the pretreatment SBR2 is provided with a magnetic stirrer 16, and the pretreatment SBR2 is provided with 5 valve...

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Abstract

The invention relates to an apparatus and a method for producing acetic acid through alkaline fermentation of residual sludge which is reinforced by pretreatment of strong base, which belongs to the technical field of acid production through anaerobic fermentation of sludge. The apparatus comprises a residual sludge case, a SBR apparatus, a sludge pump, a sludge inlet pump, an agent pump, a pH determinator, a sludge discharge case, a stirrer, a feeding case, and a heating rod. The method comprises the following steps: under temperature between 25+/-1 DEG C, performing pretreatment on residual sludge after elutriation in a strong base (pH is 12) SBR apparatus, pumping into a semi-continuous flow fermentation SBR apparatus for alkalescence (pH is 12) anaerobic fermentation, controlling SRT of the semi-continuous flow fermentation SBR apparatus for 10 days, and increasing acetic acid content in the semi-continuous flow fermentation SBR apparatus.

Description

Technical field: [0001] The invention relates to a device and method for strong alkali pretreatment to strengthen residual sludge alkaline fermentation to produce acetic acid, belonging to the technical field of sludge anaerobic fermentation acid production. The remaining sludge is pretreated with strong alkali (pH=12) and then subjected to alkaline (pH=10) fermentation to increase the production of acetic acid. Background technique: [0002] At present, there are generally problems of insufficient carbon sources and low C / N in urban domestic sewage in our country. In order to improve the effluent quality of sewage treatment plants, it is necessary to add a large amount of external carbon sources (such as methanol, sodium acetate, etc.) to the sewage. Strengthen the ability of microorganisms to remove nitrogen and phosphorus, but the addition of external carbon sources will greatly increase the treatment cost of sewage treatment plants. At present, urban sewage treatment pl...

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Application Information

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IPC IPC(8): C12M1/34C12M1/02C12P7/06
CPCC12M21/12C12M23/58C12M27/02C12M41/24C12M41/26C12M45/06C12P7/54Y02E50/10
Inventor 彭永臻邢立群金宝丹何岳兰王淑莹
Owner BEIJING UNIV OF TECH
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