Method for autothermal thermophilic aerobic digestion of sludge and device thereof

A high-temperature aerobic digestion and sludge self-heating technology, applied in the fields of environmental protection and comprehensive utilization of resources, can solve the problems of affecting the stable operation of the process, low oxygen transfer efficiency, high cost of pure oxygen aeration, and achieve construction investment and operating costs Low, good homogenization effect, accelerated reproduction and growth effect

Active Publication Date: 2010-06-02
广州市净水有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The aeration equipment of the existing ATAD process generally lays aeration pipes at the bottom of the reactor, but this aeration method has the disadvantages of low oxygen transfer efficiency, and the aeration holes are easily blocked, which affects the stable operation of the entire process.
Some ATAD processes choose pure oxygen aeration to improve oxygen transfer efficiency, but the cost of pure oxygen aeration is extremely high and it is difficult to promote industrialization

Method used

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  • Method for autothermal thermophilic aerobic digestion of sludge and device thereof
  • Method for autothermal thermophilic aerobic digestion of sludge and device thereof
  • Method for autothermal thermophilic aerobic digestion of sludge and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] (1) Raw sludge (taken from Guangzhou Liede Sewage Treatment Plant, the sludge water content percentage is 94.5%, the pH value is 7.23, the sludge volatile organic matter VSS is 29.5g / L, and the chemical oxygen demand COD is 18042mg / L, dissolved oxygen DO is 2.1mg / L, oxidation-reduction potential ORP is -246mV) into the tank through the mud inlet; fill the water bath jacket with water; turn on the stirring motor (rotating speed is 100r / min) and the blower ( The air pressure is 0.2MPa), and the aeration rate is controlled by a rotameter to 0.4m 3 / min; By adjusting the valve of the sludge return pipe, the return sludge is 0.4m 3 / min flow for circular aeration; turn on the electric heating tube, adjust the temperature to 60°C, and start the domestication reaction;

[0044] (2) After 7 days, discharge 50% of the total volume of sludge in the reactor through the sludge outlet, and then add raw sludge with the same volume as the discharged sludge;

[0045] (3) Step (2) is ...

Embodiment 2

[0048] In this embodiment, a digestion device with two reactors is used to carry out autothermal high-temperature aerobic digestion of sludge. The reactor includes a tank and a cover on the tank; a stirring motor is arranged above the cover. , a mud inlet and a gas collection port; the stirring motor extends into the tank body, and the lower end of the stirring motor is provided with a blade; the tank body is provided with a water bath cover, the water bath cover is close to the inner wall of the tank, and the inside of the water bath cover is provided with an electric heating tube; The bottom of the tank body is provided with a sludge discharge port, and the branch of the sludge discharge port is connected with the sludge return pipe, and the sludge return pipe is connected with the two reactors; the top of the cover is provided with two temperature sensors, of which One temperature sensor extends into the inside of the tank body, and the other temperature sensor extends into ...

Embodiment 3

[0056] (1) Raw sludge (taken from Guangzhou Liede Sewage Treatment Plant, the sludge water content percentage is 97%, the pH value is 7.21, the sludge volatile organic matter VSS is 38.6g / L, and the chemical oxygen demand COD is 15028mg / L, dissolved oxygen DO is 2.5mg / L, oxidation-reduction potential ORP is -215mV) into three tanks through the mud inlet; fill water inside the water bath jacket; turn on the stirring motor (rotational speed is about 105r / min) And blower (air pressure is 0.3MPa), the aeration rate is controlled by rotameter to 0.1m 3 / min; By adjusting the valve of the sludge return pipe, the return sludge will flow at a rate of 0.05m 3 / min flow for circular aeration; turn on the electric heating tube, adjust the temperature to 70°C, and start the domestication reaction;

[0057] (2) After 6 days, discharge 70% of the total volume of sludge in the first reactor through the sludge outlet, and replenish the same volume of sludge in the second reactor as the disch...

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Abstract

The invention discloses a method for the autothermal thermophilic aerobic digestion of sludge and a device thereof. The device is located at the position that the sludge reflowing pipe is connected to a reactor; an aerator pipe is placed in the sludge reflowing pipe and is in a structure with two closed ends; the side surface of the aerator pipe is communicated with the air inlet pipe of a blower; and aeration holes for aeration are arranged on the aerator pipe. When the reflowing sludge is adequately aerated when the reflowing sludge flows through the section of the reflowing sludge pipeline provided with the aerator pipe, and finally the purpose of adequately and uniformly aerating all the sludge inside the reactor is achieved through the continuous circulation of the reflowing sludge in the system. The invention ensures that air and the sludge are better mixed, the propagation and the growth of aerobic digestive bacteria are accelerated, the efficiency of sludge digestion is improved, and better homogeneous effects and lower running cost are achieved, the aerated efficiency is improved, and the energy cost is saved. The invention can reduce the volatile organic substance in the sludge by more than 45% within 3-6 days, and decrease the amount of pathogenic bacteria by more than 99%; and the sludge product can achieve the standard of A-level biologic solids.

Description

technical field [0001] The invention relates to the fields of environmental protection and resource comprehensive utilization, in particular to a sludge self-heating high-temperature aerobic digestion method and a device thereof. Background technique [0002] my country's urban sewage plants discharge tens of millions of tons of wet sludge every year. At present, Shanghai and Shenzhen have completed the preparation of sludge disposal plans, and cities such as Beijing and Tianjin are in the process of preparing sludge disposal plans. There are currently three sludge treatment methods: incineration, landfill and resource utilization. Both incineration and landfill have huge defects. The incineration process requires a huge investment and is likely to cause air pollution. Domestic landfill is often used, but it requires a large amount of land and will cause secondary pollution to the environment. Due to the high water content of the dewatered sludge of the sewage treatment pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/02C05F7/00
CPCY02A40/20Y02W10/20
Inventor 罗刚陈运进黄少斌徐荣险黄慧星
Owner 广州市净水有限公司
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