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Three-stage methane preparation device and method by utilizing surplus sludge

A technology for excess sludge and sludge, applied in sludge treatment, biological sludge treatment, waste fuel, etc., can solve the problems of sludge environmental pollution, achieve high efficiency, low cost, and realize the effect of resource utilization

Inactive Publication Date: 2010-12-08
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this invention is to solve the problem of environmental pollution caused by most of the sludge produced in sewage treatment plants without proper treatment and random stacking, and provides a device and method for producing biogas from three-stage residual sludge

Method used

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  • Three-stage methane preparation device and method by utilizing surplus sludge

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specific Embodiment approach 1

[0011] Specific embodiment one: The three-stage residual sludge biogas production device of this embodiment is mainly composed of an electrochemical oxidation tank 1, a hydrolytic acidification tank 2 and a biogas tank 3; the sludge outlet of the electrochemical oxidation tank 1 is connected with the hydrolytic acidification The sludge inlet of the pool 2 is connected, the sludge outlet of the hydrolytic acidification pool 2 is connected with the sludge inlet of the biogas tank 3, and the biogas tank 3 is provided with a biogas outlet, a drainage port and a slag discharge port.

specific Embodiment approach 2

[0012] Embodiment 2: This embodiment is a further limitation of Embodiment 1, wherein the sludge outlet of the electrochemical oxidation tank 1 is connected to the sludge inlet of the hydrolytic acidification tank 2 through a gate valve.

specific Embodiment approach 3

[0013] Embodiment 3: This embodiment is a further limitation of Embodiment 1 or 2. The sludge outlet of the hydrolytic acidification tank 2 is connected to the sludge inlet of the biogas digester 3 through a valve.

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Abstract

The invention discloses three-stage methane preparation device and method by utilizing surplus sludge, relating to methane preparation device and method and solving the environment pollution problem as most sludge is not duly handled currently. The three-stage methane preparation device by utilizing the surplus sludge mainly comprises an electrochemical oxidation tank, a hydrolytic acidification tank and a methane tank; and the three-stage methane preparation method by utilizing the surplus sludge is implemented based on the devices and sequentially comprises three stages of: a sludge electrochemical lysis hydrolysis stage, a sludge anaerobic acidification stage and a sludge anaerobic fermentation methane preparation stage, wherein the sludge electrochemical lysis hydrolysis stage comprises the steps of: destroying activated sludge floc, dissolving microbial cells and releasing macromolecular organic matters in the microbes by adopting an electrochemical oxidation technology so as to realize the sludge hydrolysis; the sludge anaerobic acidification stage comprises the steps of: controlling biological bacteria group to take acid-forming bacteria as principle matters, fermenting and acidifying hydrolyzed sludge and entering into the next stage when the pressure is greater than 1atm; and the sludge anaerobic fermentation methane preparation stage comprises the steps of: preparing methane by adopting up-flow anaerobic fermentation, selecting superior methane bacteria colonies by controlling the pH value and realizing the methane preparation. The invention can be used in the field of methane preparation by utilizing sludge.

Description

technical field [0001] The invention relates to a biogas preparation device and a preparation method. Background technique [0002] Sludge is a by-product of the sewage treatment process. Since entering the "Eleventh Five-Year Plan", my country's sewage treatment industry has developed rapidly, and the sewage treatment capacity and treatment rate have increased rapidly, bringing a large amount of excess sludge. According to the data of the Ministry of Housing and Urban-Rural Development, by the end of 2009, the national urban sewage treatment volume reached 28 billion cubic meters, and the production of wet sludge (with a moisture content of 80%) exceeded 20 million tons. The survey results show that 80% of the sludge produced by my country's sewage treatment plants has not been properly treated, and the pollution and re-pollution problems caused by random stacking of sludge are becoming more and more serious. Contents of the invention [0003] The purpose of the present ...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/343Y02E50/30Y02W10/20
Inventor 王丽王琳强亮生李春梅张宏媛
Owner HARBIN INST OF TECH
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