Method for producing methane through anaerobic digestion of high-solid content sludge

An anaerobic digestion, high solid content technology, applied in biological sludge treatment, waste fuel and other directions, can solve the problems of low volume load and low gas production efficiency of sludge anaerobic digestion, and improve sludge resource utilization and efficiency. The degree of energy utilization, increasing efficiency, and the effect of broad application prospects

Active Publication Date: 2017-02-22
NANJING UNIV YIXING ENVIRONMENTAL PROTECTION RES INST +1
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  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of low volume load and low gas production efficiency of existing sludge anaerobic digestion, the purpose of the present invention is to provide a method for producing methane by anaerobic digestion of sludge with high solid content, with a solid content rate of 12-16 % of mechanically dewatered sludge is the treatment object. On the basis of the traditional anaerobic digestion control process, by adding various regulators in proportion and stages, the methane production rate per unit volume of the anaerobic digestion reactor can be greatly improved

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  • Method for producing methane through anaerobic digestion of high-solid content sludge

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Effect test

Embodiment 1

[0030] Such as figure 1 As shown, the sludge dehydrated by a belt filter press was taken from an urban sewage treatment plant, with a solid content of 12%, and an anaerobic digestion experiment was carried out.

[0031] Step 1: The carbon-nitrogen ratio of the sludge is measured as 22 according to the standard method of TOC measuring instrument and soil total nitrogen measurement, which is within a suitable range, so no additional carbon-nitrogen ratio regulator is added.

[0032] Step 2. Since the experiment was in summer and the average daytime temperature was about 37°C, the sludge to be digested was sealed and kept at room temperature for one day. The inoculum sludge comes from the hydrolytic acidification tank of the urban sewage treatment plant, and the SS is 14g / L after sedimentation and concentration. Take 800mL dewatered sludge, add 200mL inoculated sludge, and mix.

[0033] Step 3, add rhamnolipid 1g, alkyl polyglycoside 0.1g, TCS 1mg to the mixed sludge, then add ...

Embodiment 2

[0036] The sludge dehydrated by centrifuge was taken from a city sewage treatment plant, with a solid content of 16%, and an anaerobic digestion experiment was carried out.

[0037] Step 1. Measure the carbon-nitrogen ratio of the sludge according to the TOC measuring instrument and the standard method of soil total nitrogen measurement to be 15. Take the broken kitchen waste from a staff canteen, and measure its carbon-nitrogen ratio by the same method. The ratio is mixed with the sludge to be digested, so that the carbon-nitrogen ratio is 20, and it is ready for use.

[0038] Step 2: Place the sludge to be digested in a sealed oven at 37°C, and treat it at a constant temperature for one day. The inoculum sludge comes from the hydrolytic acidification tank of an urban sewage treatment plant, and the SS is 12g / L after sedimentation and concentration. Take 4L of dewatered sludge, add 1L of inoculated sludge, and mix.

[0039] Step 3, add rhamnolipid 15g, alkyl polyglycoside 1...

Embodiment 3

[0042]The sludge dehydrated by a centrifuge was taken from the sewage treatment section of a pharmaceutical factory, with a solid content of 14%, and an anaerobic digestion experiment was carried out.

[0043] Step 1. Measure the carbon-nitrogen ratio of the sludge according to the standard method of TOC measuring instrument and soil total nitrogen measurement to be 8, take the kitchen waste after being smashed from a staff canteen, measure its carbon-nitrogen ratio by the same method, and then calculate and press The ratio is mixed with the sludge to be digested, so that the carbon-nitrogen ratio is 40, and it is set aside.

[0044] Step 2: Place the sludge to be digested in a sealed oven at 37°C, and treat it at a constant temperature for 0.5 days. The inoculum sludge comes from the hydrolytic acidification tank of an urban sewage treatment plant, and the SS is 16g / L after sedimentation and concentration. Take 3.3L dewatered sludge, add 1.7L inoculated sludge, and mix.

[...

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Abstract

The invention discloses a method for producing methane through anaerobic digestion of high-solid content sludge, belonging to the technical field of sludge treatment. The method comprises the steps of regulating the carbon nitrogen ratio of a treatment object, namely the dehydrated high-solid content sludge of a municipal sewage treatment plant, carrying out intermediate temperature pretreatment, adding inoculated sludge in a proportion, then adding waste scrap iron, rhamnolipid, alkyl polyglucoside, 3,3,4,5-tetrachlorosalicylanilide (TCS) and the like in a phased manner, turning and stirring at regular intervals, controlling the temperature at 34-38 DEG C, and carrying out anaerobic digestion. After the high-solid content sludge is treated, the internal mass transfer efficiency of the sludge is increased in the anaerobic digestion process, and the yield of methane is increased. Medicament materials used in the method include production waste, a biodegradable surfactant and a low-toxicity chemical uncoupling agent, so that the production of the methane through the anaerobic digestion of the high-solid content sludge can be effectively promoted, the environmental risk is reduced, and the utilization degrees of the recycling and energy regeneration of the sludge are increased.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment, and more specifically relates to a method for producing methane by anaerobic digestion of sludge with high solid content. Background technique [0002] A large amount of sludge will be generated in the process of water treatment, and the treatment and disposal of sludge has become an unavoidable and important issue. Under the background of sludge reduction, harmlessness, and resource utilization, anaerobic digestion technology has become a research hotspot. Anaerobic digestion treatment of sludge can reduce the content of organic matter in the sludge and promote the stability of the sludge. On the other hand, the biogas produced by digestion can realize energy recovery in the sludge through cogeneration of heat and power. "Technical Guidelines for Sludge Treatment and Disposal of Urban Sewage Treatment Plants (Trial)", "Suggestions for Sludge Disposal during the Twelfth Five-Year Plan" ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCC02F11/04Y02E50/30
Inventor 王庆黄辉任洪强张瑞
Owner NANJING UNIV YIXING ENVIRONMENTAL PROTECTION RES INST
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