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High-temperature micro-aerobic-anaerobic digestion device and method for organic sludge

A technology of organic sludge and anaerobic digestion, applied in sludge treatment, biological sludge treatment, waste fuel, etc., can solve the problems of limited oxygenation, difficulty in reaching an aerobic state, and inability to release enough heat to save costs Effect

Inactive Publication Date: 2015-10-07
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The high-temperature micro-aerobic stage of the preparation process has the problem of difficult oxygenation. In actual operation, under the high temperature condition of 55°C to 70°C, the dissolved oxygen concentration is very low, and the oxygen mass transfer efficiency of the semi-solid material is low, and the oxygenation is very difficult. Therefore, it is difficult for this method to reach the aerobic state according to the content disclosed in the text. If the aerobic condition cannot be reached, the first stage cannot release enough heat, and the organic solids are easy to anaerobic acidification, and the pH value of the sludge flowing out from the first stage is relatively low. low, leading to the inability to produce biogas in the second stage anaerobic digestion process, and the anaerobic digestion residence time is long; in addition, according to the content currently disclosed in this method, it is difficult to control the temperature of mesophilic anaerobic digestion to the target temperature, because the heat exchanger recovers The waste heat is low (that is, the temperature difference between 55°C ~ 70°C and 35°C ~ 40°C is very small), and it is difficult to achieve the heat preservation effect; due to the long residence time and large volume of the anaerobic pool, the heat preservation effect is achieved through the heat exchanger in winter just lower

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  • High-temperature micro-aerobic-anaerobic digestion device and method for organic sludge

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Experimental program
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Embodiment 1)

[0035] See figure 1 , The high-temperature micro-aerobic-anaerobic digestion device for organic sludge in this embodiment includes a self-heating high-temperature micro-aerobic reactor 1, an anaerobic fermentation reactor 2 and a pH adjustment tank 3. The pH adjustment tank 3 is arranged between the high-temperature micro-aerobic reactor 1 and the anaerobic fermentation reactor 2, and the outlet of the self-heating high-temperature micro-aerobic reactor 1 communicates with the pH adjustment tank 3 through a pipeline, and the pH value The adjustment tank 3 communicates with the feed port of the anaerobic fermentation reactor 2 through a pipeline and a pump.

[0036] The self-heating high-temperature micro-aerobic reactor 1 includes a reaction tank 11 , a sludge return system 12 , an aeration system 13 , a temperature sensor 14 and a gas absorption treatment device 15 .

[0037] The outer periphery of the reaction tank 11 is provided with an insulating layer, and the reaction t...

Embodiment 2)

[0068] The organic sludge high-temperature micro-aerobic-anaerobic digestion method of the present embodiment is identical with embodiment 1 except that:

[0069] Step ③ The organic sludge is subjected to high-temperature anaerobic digestion.

[0070] Open the valve connected to the pipeline, step ② releases the dissolved oxygen and is pumped into the anaerobic fermentation reactor 2 through the high-temperature micro-aerobic digestion sludge. The sludge stays in the anaerobic fermentation reactor 2 for 6-10 days to complete the anaerobic digestion process. The temperature of the high-temperature anaerobic digestion is 50°C-55°C, and the discharged sludge is directly used for agriculture after mechanical dehydration.

[0071] High-temperature anaerobic digestion can speed up the reaction rate. Part of the heat source for high-temperature anaerobic digestion comes from the self-heating type high-temperature micro-aerobic flow out of the sludge in the previous stage. The other ...

Embodiment 3)

[0074] The organic sludge high-temperature micro-aerobic-anaerobic digestion method of the present embodiment is identical with embodiment 1 except that:

[0075] The self-heating type high-temperature micro-aerobic reactor 1 also includes a defoaming system, and the defoaming system includes an air defoaming pipe and an injection port; A small hole; the injection port is installed on the top of the reactor body. When the defoaming system is working, the gas blown out through the small holes on the wall of the air defoaming pipe breaks the foam; the injection port can spray the defoamer, and the defoamer is sprayed into the reactor and evenly distributed by the agitator It acts as a defoamer on the entire liquid surface.

[0076] Steps of the digestion method ② During the high-temperature micro-aerobic digestion process of organic sludge, the defoaming system sends air into the reaction tank to break the bubbles generated in the reaction tank, so that the digestion process go...

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Abstract

The invention discloses an organic sludge high-temperature microaerobic-anaerobic digestion device and method. The method is characterized in that firstly organic sludge is subjected to high-temperature microaerobic digestion, after the high-temperature microaerobic digestion is ended, the digested sludge enters a pH value adjusting tank from a discharge port through a pipeline, alkali liquor is put in the pH value adjusting tank so as to adjust the pH value of the material in the tank, and the sludge remains for 3-5 hours in the tank so as to release dissolved oxygen in the sludge; then the sludge is fed into an anaerobic fermentation reactor by using a pump and remains for 6-20 days, thus the anaerobic digestion process is completed. The method has the beneficial effects that the first half of the organic sludge digestion process is a self-heating type high-temperature microaerobic digestion process rather than a self-heating type high-temperature aerobic digestion process; the amount of air supplied in the self-heating type high-temperature microaerobic digestion process is limited, and VFA (volatile fatty acids) are easily generated under an oxygen limiting condition and easily generate methane under an anaerobic condition, therefore, the further digestion of the sludge in the second half of the anaerobic digestion process is facilitated so as to generate methane, the aeration rate can also be reduced, and the energy consumption is reduced.

Description

technical field [0001] The invention relates to the field of solid waste treatment, in particular to a high-temperature micro-aerobic-anaerobic digestion device and method for organic sludge. Background technique [0002] With the development of social economy and urbanization in our country, the amount of urban sewage is constantly increasing. It is predicted that in 2010 my country's urban sewage discharge will reach 44 billion m 3 / d; will reach 53.6 billion m in 2020 3 / d. Although my country's sewage treatment capacity and treatment rate are not high at present, urban sewage treatment plants discharge about 300,000 tons of dry sludge every year, and it is also growing at a rate of 10% per year. [2] . my country's existing sewage treatment plants have the phenomenon of heavy water and light mud. A large part of the sludge has not been stabilized and harmless treated, and the sludge treatment facilities have not been effectively operated. The sludge has not been prope...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/02C02F11/04
CPCY02E50/343Y02W10/23Y02W10/27Y02E50/30Y02W10/20
Inventor 程洁红孔峰高洋戴雅
Owner JIANGSU UNIV OF TECH
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