Anaerobic fermentation technical method of septic tank sediments by assist of industrial waste heat

A technology of anaerobic fermentation and process method, which is applied in the direction of botany equipment and methods, agriculture, animal husbandry, etc., can solve the problems of inappropriateness, achieve the effects of reducing emissions, shortening the degradation cycle, and improving the efficiency of gas production

Inactive Publication Date: 2009-09-23
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

There is no suitable equipment for anaerobic fermentation of high-concentration septic tank sediments

Method used

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  • Anaerobic fermentation technical method of septic tank sediments by assist of industrial waste heat
  • Anaerobic fermentation technical method of septic tank sediments by assist of industrial waste heat

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Embodiment Construction

[0037] The steps of the present invention are as follows:

[0038] (1) High-concentration (TS=15%±2%) deposits from urban septic tanks, remove impurities therein through a drum vibrating screen, and then put them into a closed anaerobic fermentation tank. Add low-concentration (TS=0.1%-2%) excrement from the septic tank into the anaerobic fermentation tank, adjust its TS=8%-10%, and stir evenly.

[0039] (2) Detect the pH value of the fermentation raw material, and adjust the pH value to 7.2-7.4 with clarified lime water supernatant.

[0040] (3) Industrial circulating cooling water (60°C ~ 80°C), blended with normal temperature water (15°C) to 55°C, and maintain the flow.

[0041] (4) The airtight interlayer on the wall of the fermenter provides a water bath environment for the fermenter: the adjusted 55°C circulating water in (3) enters from the lower part of the interlayer of the tank and flows out from the upper part.

[0042] (5) Carry out the first-generation fermentat...

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Abstract

The invention provides an anaerobic fermentation technical method of septic tank sediments under the assist of industrial waste heat, belonging to the technical field of an environment-friendly energy. The invention is characterized in that the method comprises the following steps of: taking septic tank sediments as a raw material under the condition that the temperature provided by the industrial waste heat is 55 DEG C; adding liquid dung which is adjusted to ensure that pH=7.2-7.4 and Ts=8%-10% into an anaerobic fermentation pot; stirring and fermenting the mixture; when enriched strains meet the condition that fermentation pot operates at the full load, normally generating gas; stopping stirring before fermentation gas generation reaches an inflection point at each time; extracting 2/3 fermenting fluid to produce fertilizer, fermenting the remaining 1/3 fermenting fluid to generate marsh gas; rinsing, desulfurizing, drying and storing the marsh gas in a canning way after the marsh gas enters into a marsh gas collecting tower. The invention can advance gas generating time, lift gas-generating efficiency, shorten degradation period, achieve a recycling effect since marsh residues and marsh liquid can be made into fertilizer and biotic pesticide with high quality, and simultaneously reduce sewage discharge to achieve a minimizing effect.

Description

technical field [0001] The invention belongs to the technical field of environmental protection energy, and relates to a method for producing biogas by high-temperature anaerobic fermentation, specifically, a high-temperature anaerobic fermentation using urban septic tank sediments as raw materials and under the temperature conditions provided by industrial waste heat Process methods for producing biogas, biogas slurry and biogas residue. Background technique [0002] At present, the discharge from urban toilets enters the septic tanks installed in the building units through pipelines. Its function is to receive and store household sewage. Its internal structure is divided into primary sedimentation tanks, secondary sedimentation tanks and tertiary sedimentation tanks. The principle is to use the different densities of the components of the effluent to carry out graded sedimentation: the effluent first enters the primary sedimentation tank, and the large particles accumulate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C05F5/00A01N61/00
CPCY02E50/343Y02A40/20Y02E50/30Y02P20/129Y02W10/20Y02W30/40
Inventor 苍大强董建白皓宗燕兵陈相利赵立华张玲玲赵洁玉刘维顺王雪婷
Owner UNIV OF SCI & TECH BEIJING
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