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Method for improving methane gas yield of anaerobic digestion of sludge and reducing ecological toxicity of heavy metals

An anaerobic digestion and heavy metal technology, applied in sludge detoxification, chemical instruments and methods, sludge treatment, etc., can solve the problem of reducing the adsorption capacity of biochar to heavy metal ions, poor acid resistance of biochar, and poor adsorption capacity of heavy metals and other problems, so as to achieve the effects of not being prone to secondary pollution of the environment, increasing the specific surface area, and enhancing the adsorption and complexation ability

Active Publication Date: 2020-12-29
TONGJI UNIV
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Problems solved by technology

However, due to the continuous high temperature effect of biochar during the pyrolysis process, the number of surface groups is small, and its adsorption capacity for heavy metals is poor.
At the same time, the sludge anaerobic digestion process is a complex system in which microorganisms cooperate with each other. During the acid production stage, the pH value of the digestion system decreases due to the accumulation of volatile fatty acids. The ability of biochar to resist acid is poor, and it will also reduce the adsorption capacity of biochar to heavy metal ions

Method used

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  • Method for improving methane gas yield of anaerobic digestion of sludge and reducing ecological toxicity of heavy metals
  • Method for improving methane gas yield of anaerobic digestion of sludge and reducing ecological toxicity of heavy metals
  • Method for improving methane gas yield of anaerobic digestion of sludge and reducing ecological toxicity of heavy metals

Examples

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Effect test

Embodiment 1

[0031] (1) Preparation of straw biochar BC:

[0032] Corn stalks (taken from a farmer’s market in Shanghai) were placed in a tube furnace. Under anaerobic conditions, the temperature of the tube furnace was raised to 600 °C at a rate of 18 K / min, and then kept at a constant temperature for 180 min. After natural cooling, it was ground and passed through 80 °C. mesh sieve to obtain straw biochar BC;

[0033] (2) Preparation of iron-manganese oxide nanoparticle-loaded biochar material FMBC:

[0034] Under stirring conditions, 5.56g FeSO 4 ·7H 2 O and 0.5g straw biochar BC were added to 70mL deionized water to obtain solution R1, and 1.053g KMnO 4 Add solution R2 to 60mL deionized water; add solution R2 dropwise to solution R1 under constant stirring, and then age at room temperature for 120min. During the reaction, add an appropriate amount of NaOH solution to keep the pH of the reaction system at 9.6. After the reaction is over, centrifuge, wash, and dry to obtain the iron-...

Embodiment 2

[0039] Using the same method as in Example 1, the only difference is that the dosage of FMBC added to the digestion unit in step (3) is 0.151g / g mixed sludge dry matter.

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Abstract

The invention discloses a method for improving methane gas production rate of anaerobic digestion of sludge and reducing ecological toxicity of heavy metals, and belongs to the technical field of environmental protection. The method comprises the following steps: carrying out high-temperature pyrolysis on straws serving as a raw material under an anaerobic condition to obtain straw biochar, and carrying out chemical modification on the straw biochar under an alkaline condition to obtain an iron-manganese oxide nanoparticle loaded biochar material; adding the iron-manganese oxide nanoparticle loaded biochar material into an anaerobic digestion device according to a certain proportion, and carrying out anaerobic fermentation, so that the stability of the anaerobic digestion process can be greatly enhanced, the methane gas production rate can be increased, the ecological toxicity of heavy metals can be reduced, and the adsorption capacity to heavy metal ions can be improved.

Description

technical field [0001] The invention relates to a method for increasing methane gas production in anaerobic digestion of sludge while reducing the ecotoxicity of heavy metals, and belongs to the technical field of environmental protection. Background technique [0002] Sewage treatment plants produce a large amount of sludge every year, and the treatment and disposal of sludge has become one of the hot issues in the world. Taking China as an example, 11.2×106 tons of dry sludge is produced every year, and the cost of sludge treatment and disposal accounts for 25%-65% of the total operating cost of the sewage treatment plant. At present, more than 80% of the sludge in our country has not been stabilized, which makes the persistent organic pollutants, pathogens and heavy metals contained in the sludge diffuse in nature, causing harm to the ecological environment and human health. Sludge is rich in organic matter and trace elements, which can be used to increase soil fertility...

Claims

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Application Information

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IPC IPC(8): C02F11/04C02F11/00C02F101/20
CPCC02F11/004C02F11/04C02F2101/20Y02E50/30
Inventor 王云才张敏
Owner TONGJI UNIV
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