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Method using charcoal for promoting anaerobic digestion of sludge to produce methane

A technology for anaerobic digestion and methane production, applied in the field of solid waste recycling, can solve problems such as limiting large-scale application, increasing difficulty, corrosion of instruments and equipment, etc., to improve soil physical and chemical properties, increase anaerobic digestion effect, and produce methane. The effect of increasing the amount of

Inactive Publication Date: 2014-11-19
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the alkali pretreatment method, the dosage of alkali is large, the operating cost is high, it will cause corrosion to instruments and equipment, and it will also increase the difficulty of subsequent treatment.
Ultrasonic and γ-ray pretreatments are limited in large-scale application due to high energy consumption, high cost, harsh reaction conditions and certain risks.

Method used

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  • Method using charcoal for promoting anaerobic digestion of sludge to produce methane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Take the primary sludge from the urban sewage plant. The TSS (referring to the concentration of suspended matter in the sludge) of the sludge is 10g / L, and the VSS (referring to the organic matter volatilized after the suspended matter in the sludge is calcined at a high temperature of 575°C) Concentration) is 5.9g / L, add charcoal powder 0.1g;

[0023] (2) Put it into a sealed anaerobic digestion equipment, control the culture temperature at 35°C, and control the pH at 7.8; perform anaerobic digestion treatment on the sludge by stirring, and repeat the culture 3 times.

[0024] Using the above-mentioned treatment method, the methane yield of the sludge is increased by 40% compared with the working condition without adding charcoal powder, and the start time of sludge anaerobic digestion is 20% earlier.

Embodiment 2

[0026] (1) Take the secondary sedimentation sludge from the urban sewage plant, the TSS of the sludge is 10g / L, the VSS is 5.9g / L, and add 0.1g of charcoal powder;

[0027] (2) Put it into a sealed anaerobic digestion equipment, control the culture temperature at 35°C, and control the pH at 7.8; perform anaerobic digestion treatment on the sludge by stirring, and repeat the culture 3 times.

[0028] Using the above-mentioned treatment method, the methane yield of the sludge is increased by 40% compared with the working condition without adding charcoal powder, and the start time of sludge anaerobic digestion is 20% earlier.

Embodiment 3

[0030] (1) Take the dewatered sludge from the urban sewage plant, the TSS of the sludge is 8g / L, the VSS is 7.5g / L, and add 0.1g of charcoal powder;

[0031] (2) Put it into a sealed anaerobic digestion equipment, control the culture temperature at 35°C, and control the pH at 7.8; perform anaerobic digestion treatment on the sludge by stirring, and repeat the culture 3 times.

[0032] Using the above-mentioned treatment method, the methane yield of the sludge is increased by 40% compared with the working condition without adding charcoal powder, and the start time of sludge anaerobic digestion is 20% earlier.

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Abstract

The invention relates to a method using charcoal for promoting anaerobic digestion of sludge to produce methane, and the method comprises the following steps: (1) adding 0.5 to 5% by volume of the dry charcoal powder into the sludge to obtain a mixed material, adjusting the mixed material pH value to 7.5-8; and (2) putting the mixed material into a sealed anaerobic digestion device for anaerobic digestion of the sludge in the condition of an intermediate temperate of 30-40 DEG C or a high temperature of 50 to 60 DEG C by means of stirring. Compared with the prior art, the charcoal powder is used as an adding material, organic matters in the sludge are fully recycled and reused, the environment pollution is reduced, the sludge anaerobic digestion time is brought forward by 15-25%, the methane production yield is increased by 40-60%; the method is simple in operation, low in investment and treatment cost, and conductive to reducing environment pollution of the sludge, separation of organic remains produced by the anaerobic digestion of the sludge and the charcoal is not needed, and the organic remains can be directly applied to soil as a soil conditioner.

Description

technical field [0001] The invention belongs to the field of solid waste resource utilization, and relates to a process for anaerobic digestion of sludge to produce methane, in particular to a method for using charcoal to promote sludge anaerobic digestion to produce methane. Background technique [0002] With the expansion of the scale of urban sewage treatment plants, the amount of sludge produced is increasing day by day. Through the construction of sewage treatment plants in the "Eleventh Five-Year Plan", the annual sludge output has reached more than 30 million tons (calculated as dewatered sludge with a moisture content of 80%), and is increasing at a rate of 10% per year. Anaerobic digestion refers to the process of degrading organic matter by facultative bacteria and obligate anaerobic bacteria under anaerobic conditions, and the final products of decomposition are carbon dioxide and methane. Anaerobic digested sludge, on the one hand, can produce methane to realize...

Claims

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Application Information

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IPC IPC(8): C02F11/04
CPCY02E50/30
Inventor 何品晶张继宁罗承皓吕凡章骅邵立明
Owner TONGJI UNIV
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