Method for improving efficiency of anaerobic digestion of wastewater sludge

A technology for anaerobic digestion and wastewater sludge, which is applied in chemical instruments and methods, water/sludge/sewage treatment, sludge treatment, etc. It can solve the problems of large digester volume, restrictions on popularization and application, and long residence time. Achieve the effects of improving processing capacity, broad application prospects, and improving dehydration capacity

Inactive Publication Date: 2015-01-07
黎荣
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Problems solved by technology

Sludge anaerobic digestion has a long sludge residence time (20-30d), and the volume of the digester is large. Studies have shown that the combination of physical and chemical technologies such as ultrasonic, ozone, heat treatment, and acid-base treatment with anaerobic digestion technology can effectively improve the efficiency of anaerobic digestion. Oxygen digestion efficiency, but most of these enhanced technologies are pretreatment technologies, which not only add a step to the sludge treatment system, but also have defects such as high energy consumption or low efficiency, which restricts the popularization and application of these technologies. If in the sludge digestion process In the process of using electrolytic sludge, the original sludge anaerobic digestion system is slightly changed, which can not only improve the treatment efficiency, but also reduce the amount of sludge

Method used

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  • Method for improving efficiency of anaerobic digestion of wastewater sludge
  • Method for improving efficiency of anaerobic digestion of wastewater sludge
  • Method for improving efficiency of anaerobic digestion of wastewater sludge

Examples

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Effect test

Embodiment 1

[0026] A municipal sewage treatment plant adopts figure 1 method to treat 40L sludge.

[0027] 40L of sludge is put into the sludge anaerobic digestion tank, the temperature is controlled between 30°C and 38°C, and the sludge undergoes anaerobic digestion reaction. Stir the sludge in the sludge anaerobic digester every day, let it stand after stirring, stir after standing for 8 hours, stir after standing for 16 hours, stir after standing for 8 hours, and do this every day.

Embodiment 2

[0029] A municipal sewage treatment plant treats 40L sludge. Since the ambient temperature is between 30°C and 38°C, the heat exchanger may not be activated. The function of the heat exchanger is to keep the temperature of the digestion process between 30°C and 38°C. So this implementation case can simulate Figure 2-Figure 6 process.

[0030] Put 40L of sludge into the sludge anaerobic digester. After stirring every day, take 3L of the sludge at the bottom of the tank and put it into a closed electrolytic tank for electrolysis. After 8 hours of electrolysis, return to the sludge anaerobic digester to stir and stand still for 16 hours. Then stir, take sludge, and electrolyze, and do this every day.

[0031] The volume of the electrolytic cell is 4L, the electrode is purchased from the market, and the current and installation method are selected according to the requirements of the installation guide. The current is 2-10ma / cm 2 .

[0032] Sampling and monitoring from the slu...

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Abstract

The invention discloses a method for improving the efficiency of anaerobic digestion of wastewater sludge. The method comprises the following steps: (1) raw sludge generated by wastewater treatment and circulating sludge of an anaerobic digester are mixed, are heated by a heat exchanger, and enter a sludge anaerobic digester; the sludge is digested in the sludge anaerobic digester and constantly stirred in the digestive treatment process; (2) in the process of digestive treatment in the sludge anaerobic digester, the sludge enters an electrolytic cell from the lower part of the sludge anaerobic digester through an electrolytic metering pump to carry out closed electrolytic treatment, and the sludge entering the electrolytic cell every time is not larger than 10 percent of volume of the sludge anaerobic digester; (3) the electrolyzed sludge used as the circulating sludge of the anaerobic digester repeats the processes of the step (1) and the step (2) with the raw sludge, and the circulation is repeatedly carried out. The method has the advantages that compared with the digested sludge not to be electrolyzed, the solid content of the electrolyzed digested sludge is reduced by more than 30 percent, more than 30 percent of sludge quantity is reduced, and the degradation rate of organic matters anaerobically digested by sludge is increased by more than 40 percent.

Description

technical field [0001] The invention belongs to the technical field of sludge treatment in sewage treatment plants, and in particular relates to a method for improving the anaerobic digestion efficiency of wastewater sludge. Background technique [0002] At present, domestic and foreign sewage treatment plants, especially large-scale sewage treatment plants, generally adopt anaerobic digestion treatment to stabilize the sludge before final disposal. The process of decomposing the biodegradable organic matter in the sludge into carbon dioxide, methane and water to stabilize the sludge is a common method for sludge reduction and stabilization. Sludge anaerobic digestion has a long sludge residence time (20-30d), and the volume of the digester is large. Studies have shown that the combination of physical and chemical technologies such as ultrasonic, ozone, heat treatment, and acid-base treatment with anaerobic digestion technology can effectively improve the efficiency of anaer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F11/04
CPCC02F11/006C02F11/04C02F2303/06
Inventor 不公告发明人
Owner 黎荣
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