One-step temperature-rising starting method for high-temperature anaerobic digestion reaction of sludge

A high-temperature anaerobic and anaerobic digestion technology, applied in biological sludge treatment and other directions, can solve the problems of long time consumption and low treatment efficiency, and achieve the effect of shortening the start-up period, shortening the culture period and improving the start-up efficiency.

Inactive Publication Date: 2018-07-31
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to reduce the impact of temperature changes on the system, high-temperature anaerobic digestion of sludge is often started by gradually raising the temperature, but this method takes a long time, usually more than two months, resulting in low treatment efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Adjust the solid content of the raw mud to 20g / L, then transfer it to the anaerobic reactor and preheat it to 35°C, inoculate 8% (volume ratio) of the medium-temperature anaerobic digestion seed mud with a solid content of 20g / L, and mix uniform. Add an appropriate amount of bioaccelerator and buffer group and medicament to the mixed mud, specifically including: iron powder 1g / L with a particle size of 0.015mm; 600mg / LNaHCO 3 ; Biological carrier with a filling rate of 5%. After mixing evenly, seal the anaerobic reactor to keep the system in an anaerobic state. The temperature of the system was raised to a high temperature of 55°C by one-step heating start-up method and the temperature was kept relatively stable. After 32 days of digestion, the biogas production in the system was stable and the acid concentration was maintained at a low level, and the start-up process of high-temperature anaerobic digestion was completed.

Embodiment 2

[0026] Adjust the solid content of the raw mud to 35g / L, then transfer it to the anaerobic reactor and preheat it to 35°C, inoculate 10% (volume ratio) of the medium-temperature anaerobic digestion seed mud with a solid content of 30g / L, and mix uniform. Add an appropriate amount of bioaccelerator and buffer group and medicament to the mixed mud, specifically including: 5g / L of iron powder with a particle size of 0.045mm; 1000mg / LNaHCO 3 ; Biological carrier with a filling rate of 5%. After mixing evenly, seal the anaerobic reactor to keep the system in an anaerobic state. The temperature of the system was raised to a high temperature of 55°C by one-step heating start-up method and the temperature was kept relatively stable. After 28 days of digestion, the biogas production in the system was stable and the acid concentration was maintained at a low level, and the start-up process of high-temperature anaerobic digestion was completed.

Embodiment 3

[0028] Adjust the solid content of the raw mud to 35g / L, then transfer it to the anaerobic reactor and preheat it to 35°C, inoculate 12.5% ​​(volume ratio) of the medium-temperature anaerobic digestion seed mud with a solid content of 30g / L, and mix uniform. Add an appropriate amount of bioaccelerator and buffer group and medicament to the mixed mud, specifically including: iron powder 10g / L with a particle size of 0.15mm; 1200mg / L NaHCO 3 ; Biological carrier with a filling rate of 10%. After mixing evenly, seal the anaerobic reactor to keep the system in an anaerobic state. The temperature of the system was raised to a high temperature of 55°C by one-step heating start-up method and the temperature was kept relatively stable. After 21 days of digestion, the biogas production in the system was stable and the acid concentration was maintained at a low level, and the start-up process of high-temperature anaerobic digestion was completed.

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Abstract

The invention provides a one-step temperature-rising starting method for a high-temperature anaerobic digestion reaction of sludge. The method comprises the following steps: rapidly heating raw sludgeto 35 DEG C under anaerobic conditions, performing inoculation by using mesophilic anaerobic digestion seed sludge, and performing uniform mixing; and adding a combined agent of a biological accelerant and a buffering agent, rising temperature to 55 DEG C in one step, and performing continuous stirring to complete start of the high-temperature anaerobic digestion reaction of the sludge. Comparedwith the prior art, the method provided by the invention has the following beneficial effects: 1, the method can greatly shorten a culture cycle of one-step high-temperature anaerobic digestion of thesludge, significantly improve start efficiency and make the reaction operate efficiently, and the start cycle can be shortened by 30 days or more compared with that of a conventional method; and 2, the method has the advantages of a simple process, low investment costs and unharsh conditions, and has certain practical significance for promotion and application of a high-temperature anaerobic digestion technology of the sludge.

Description

technical field [0001] The invention belongs to the technical field of solid waste treatment, and relates to a method for promoting high-temperature anaerobic digestion of sludge by one-step temperature rise and start-up. Background technique [0002] With the development of economy and society and the growth of population, the amount of sewage treatment in cities and towns in our country continues to grow. According to data from the Ministry of Housing and Urban-Rural Development, as of the end of September 2016, the average daily sewage treatment volume reached 170 million cubic meters; as a by-product of sewage biological treatment, sludge production is also increasing. How to effectively treat and dispose of huge amounts of sludge has become an environmental governance issue. problems faced. At present, sludge treatment mainly includes aerobic, anaerobic and other biological treatment methods as well as physical and chemical treatment methods. Anaerobic digestion of slu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/04
CPCC02F11/04
Inventor 朱南文于豹袁海平楼紫阳沈雁文尹常凯
Owner SHANGHAI JIAO TONG UNIV
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