Anaerobic digestion sludge conditioning system and method

An anaerobic digestion system and anaerobic digestion technology, applied in the field of solid waste treatment, can solve the problems of consuming large energy and increasing temperature, and achieve the effect of reducing energy consumption, realizing reduction and improving anaerobic digestion performance.

Inactive Publication Date: 2015-09-16
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During the operation of the conventional pre-thermal hydrolysis process, the temperature of the easily biodegradable and refractory parts of the sludge will be raised together, which consumes a lot of energy, especially when the object of treatment is mixed sludge. Most of the sludge is easily degradable organic matter

Method used

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  • Anaerobic digestion sludge conditioning system and method
  • Anaerobic digestion sludge conditioning system and method
  • Anaerobic digestion sludge conditioning system and method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] The solid content (TS) of the dewatered sludge of the urban sewage treatment plant: 15%, first diluted with water and pumped into the heating tank through the sludge pump, in the heating tank with the returned sludge after thermal hydrolysis treatment (TS: 20 %) mixed and warmed up to 55°C, before entering the anaerobic digestion system, adjust the TS to 6% with the reflux supernatant (TS: 2.5%) of the concentrated dehydration of the digestive liquid, and the residence time of the sludge in the anaerobic digestion system is On the 15th, the methane content in the gas production was 55%, and the methane production rate of the sludge was 19.06Nm 3 -CH 4 / ton- dewatered sludge, the amount of sludge discharged by the anaerobic digestion system is 56% of the amount of sludge input, the discharged digestive liquid is added with polymer flocculant for concentration and dehydration, and 80% of the separated supernatant is refluxed and adjusted For the water content of the feed...

Embodiment 2

[0040] The solid content (TS) of the dewatered sludge of the urban sewage treatment plant: 15%, first diluted with water and pumped into the heating tank through the sludge pump, in the heating tank with the returned sludge after thermal hydrolysis treatment (TS: 20 %) mixed and warmed up to 35°C, before entering the anaerobic digestion system, adjust the TS to 6% with the reflux supernatant (TS: 2.5%) of the concentrated dehydration of the digestive liquid, and the residence time of the sludge in the anaerobic digestion system is On the 30th, the methane content in the gas production was 55%, and the methane production rate of the sludge was 17.33Nm 3 -CH 4 / ton- dewatered sludge, the amount of sludge discharged by the anaerobic digestion system is 56% of the amount of sludge input, the discharged digestive liquid is added with polymer flocculant for concentration and dehydration, and 80% of the separated supernatant is refluxed and adjusted For the water content of the feed...

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Abstract

The invention provides an anaerobic digestion sludge conditioning system. The anaerobic digestion sludge conditioning system comprises a sludge storage tank, a heating tank, an anaerobic digestion system, a methane purification device, a methane utilization device, a sludge concentration dewatering device, and a pyrohydrolysis reaction tank; the sludge storage tank, the heating tank, and the anaerobic digestion system are communicated successively; the anaerobic digestion system is communicated with the methane purification device and the sludge concentration dewatering device respectively; the sludge concentration dewatering device is communicated with the heating tank and the pyrohydrolysis reaction tank respectively; the methane purification device is communicated with the methane utilization device; the methane utilization device is communicated with the anaerobic digestion system and the pyrohydrolysis reaction tank respectively; and the pyrohydrolysis reaction tank is communicated with the heating tank. According to the anaerobic digestion sludge conditioning system, postposition pyrohydrolysis is adopted, so that energy consumed on the part of sludge easy for biodegradation in the prior art is transferred to the part of sludge difficult for biodegradation, biogas production efficiency is increased, energy utilization efficiency is increased greatly, and a large amount of operation cost is reduced for practical engineering.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a conditioning system and method for anaerobic digestion sludge. Background technique [0002] As the country pays more and more attention to ecological construction, the treatment and disposal of sludge has become a new hot spot. For solid waste such as sludge, follow the principles of three modernizations, that is, harmless, volume reduction, and recycling. Among the current treatment technologies, anaerobic digestion technology is one of the technologies that are more in line with the three principles. [0003] However, traditional sewage sludge anaerobic digestion has disadvantages such as slow reaction speed, high energy consumption, long residence time (30-40 days), and low methane content in gas production, which limits the advantages of anaerobic digestion technology. [0004] A number of researches have been carried out on sludge pretreatment technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04C02F11/12C02F11/14C02F11/10
CPCY02E50/30
Inventor 洪锋姚一思黄瑛
Owner SOUTHEAST UNIV
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