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A method for decomposing excess sludge in sewage treatment plants and its application in biological hydrogen production

A technology for biological hydrogen production and excess sludge, which is applied in the oxidation treatment of sludge, water treatment parameter control, water/sludge/sewage treatment, etc. Effectively solve problems such as reducing costs and efficiently producing hydrogen

Active Publication Date: 2019-04-05
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional heat treatment conditions often do not exceed 121°C. Although it can effectively inhibit microbial activity, it is difficult to effectively break down the sludge.
The study found that the wet oxidation method can effectively break down the sludge and reduce the organic matter in it. However, the wet oxidation temperature is often at 200-300°C. While the sludge is effectively broken down, the degree of damage to the available organic matter is relatively large, reducing the Benefits of using cracked sludge as a substrate

Method used

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  • A method for decomposing excess sludge in sewage treatment plants and its application in biological hydrogen production
  • A method for decomposing excess sludge in sewage treatment plants and its application in biological hydrogen production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The effect of low temperature wet oxidation method to crack sludge

[0020] Put 400mL of excess sludge in a 500mL stainless steel tank generator, seal it, heat it to 160-180°C, and keep it for 30min, during which it is cooled by a circulating water bath to control the reaction temperature. After 30 minutes, remove the electric furnace, let the kettle generator cool down to room temperature naturally, open it, and take out the treated sludge. The properties of the sludge mixture were analyzed, and the results showed that the soluble COD of the sludge mixture was 10914mg / L, which was 32.8 times higher than that of the original sludge.

Embodiment 2

[0021] Example 2: Hydrogen production effect of cracked sludge mixture obtained by low temperature wet oxidation method

[0022] 1L of anaerobic digested sludge taken from the primary digester of a sewage treatment plant is placed in a 1L brown ground-mouth bottle, and is irradiated with gamma rays at a dose of 5kGy at room temperature to inhibit hydrogen-phagocytic bacteria and retain hydrogen-producing bacteria , the radioactive source is 60 Co. The treated inoculum sludge was stored at -80°C, and was taken out and thawed when inoculation was needed.

[0023] Take 80mL of the original sludge mixture and cracked sludge mixture, put them in 150mL conical flasks respectively, inoculate 10mL of irradiated anaerobic digested sludge into the two groups of sludge mixtures, and add 10mL of nutrients solution, so that the total reaction volume was 100 mL. Before the reaction, use 5mol / L hydrochloric acid or 5mol / L sodium hydroxide solution to adjust the initial pH of the reaction ...

Embodiment 3

[0027] Example 3: The effect of adding glucose on the hydrogen production effect of cracked sludge as a substrate fermentation

[0028] Put 400mL of excess sludge into a 500mL stainless steel tank generator and seal it. Heated to 175°C and kept for 30min, during which the reaction temperature was controlled at 175°C by cooling in a circulating water bath. After 30 minutes, remove the electric furnace, let the kettle generator cool down to room temperature naturally, open it, and take out the cracked sludge mixture.

[0029] Take 1L of anaerobic digested sludge and place it in a 1L brown ground-mouth bottle, and accept γ-ray irradiation with a radiation dose of 5kGy at room temperature, and the radioactive source is 60 Co.

[0030] Take 80mL of the original sludge mixture and cracked sludge mixture, put them in 150mL conical flasks respectively, inoculate 10mL of irradiated anaerobic digested sludge into the two groups of sludge mixtures, and add 10mL of nutrients solution, ...

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Abstract

The invention relates to a method for disintegrating residual sludge of a sewage treatment plant and an application in biological hydrogen production. Firstly, the residual sludge of the sewage treatment plant is subjected to wet oxidation treatment for 15-60 min at lower temperature of 130-200 DEG C (especially 160-180 DEG C), and by controlling the treatment temperature and time, not only can organic matters in the sludge be fully released, but also the organic matters are prevented from further oxidative decomposition; then the disintegrated sludge mixed liquid is used as a substrate, is inoculated with hydrogen producing microorganisms and is subjected to anaerobic fermentation hydrogen production at the temperature of 15-40 DEG C, fermented gas is collected, CO2 is removed, and thus hydrogen is obtained. The method has the double effects of disposition of the residual sludge and production of hydrogen, is suitable for disposition and utilization of the residual sludge of the sewage treatment plant, and disintegrates the residual sludge through wet oxidation; on one hand, the cheap and easily available substrate is provided for biological hydrogen production so as to reduce the cost of hydrogen production; and on the other hand, sludge reduction and reutilization also can be realized.

Description

technical field [0001] The invention belongs to the technical field of excess sludge treatment in sewage treatment plants, and in particular relates to a method for cracking excess sludge in sewage treatment plants and its application in biological hydrogen production. Background technique [0002] Since the industrial revolution, the use of fossil energy has had many negative impacts on the environment, and fossil energy is also becoming increasingly exhausted. Under the pressure of energy crisis and environmental pollution, there is an urgent need to develop renewable and clean energy. Hydrogen not only has the characteristics of high calorific value and clean combustion products, but also can be converted into electrical energy through fuel cells, which is an ideal clean energy. [0003] Traditional hydrogen production methods are characterized by high energy consumption and high dependence on fossil fuels, which reduces the environmental benefits of hydrogen. Biologica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/08C02F11/04C12P5/02
CPCC02F11/04C02F11/08C02F2209/08C02F2303/06C12P5/02Y02E50/30
Inventor 王建龙阴亚楠
Owner TSINGHUA UNIV
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