Method for simultaneously improving sludge anaerobic digestion efficiency and reducing ecotoxicity of heavy metals

An anaerobic digestion and heavy metal technology, which is applied in the field of solid waste recycling, can solve the problems of low treatment efficiency, achieve the effects of increasing methane accumulation, improving anaerobic digestion efficiency, and improving microbial activity

Active Publication Date: 2019-08-16
TONGJI UNIV
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Problems solved by technology

CN107892929A provides a method for preparing iron sulfide modified sludge-based biochar, the iron sulfide loaded on the biochar is nano iron sulfide or micron iron sulfide; CN107930629A provides a preparation method for loaded bio

Method used

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  • Method for simultaneously improving sludge anaerobic digestion efficiency and reducing ecotoxicity of heavy metals
  • Method for simultaneously improving sludge anaerobic digestion efficiency and reducing ecotoxicity of heavy metals
  • Method for simultaneously improving sludge anaerobic digestion efficiency and reducing ecotoxicity of heavy metals

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Embodiment

[0032] Embodiment: The specific steps of this embodiment are as follows: biochar pretreatment: under room temperature conditions, the original straw is first soaked in ZnCl 2 Activation in solution, straw raw material and ZnCl 2 The mass ratio is controlled to be 1:2; stirring and centrifuging (4000r min -1 ) and bake at (105±5)°C to constant weight. After drying, use a vacuum tube furnace to carbonize. Under the protection of nitrogen, it will be pyrolyzed at 550-580°C for 180 minutes, and the heating rate will be 20°C·min. -1 , carbonization time is 180min.

[0033] Wash with deionized water and dry at low temperature until constant weight. Soak 30g of pretreated biochar in 150mL of HCl solution with a concentration of 1.5mol / L for 24h, and then place it in a 600w WXJ-Ⅲ microwave digestion apparatus for further modification. The modified biochar material is dried at low temperature and ground through a 100-mesh sieve.

[0034] Preparation of biochar-supported zero-valen...

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Abstract

The invention relates to a method for simultaneously improving sludge anaerobic digestion efficiency and reducing the ecotoxicity of heavy metals. According to the method, after straws are activated with a ZnCl2 solution, straw biochar is prepared under a 550 DEG C high-temperature anaerobic condition, and further modification is performed by using an HCl solution and microwave; and by using modified biochar as carrier, a zero-valent nano-iron loaded modified biochar composite material HCl-FBC is prepared through a chemical reaction. According to the present invention, by adding the modified biochar composite HCl-FBC to the anaerobic digestion reactor at the initial stage of sludge anaerobic digestion, the organic matter conversion rate of sludge can be significantly increased, and the cumulative gas production of methane can be increased; HCl-FBC can easily increase the microbial diversity and the activity of the digested sludge and change the microbial community structure; and with the method, the sludge anaerobic digestion efficiency can be significant increased, the biogas production can be increased, the biological toxicity of the heavy metal in the digested sludge is effectively reduced, and the great significance is provided in the resource utilization of sludge and the reduction of the risk of sludge land use.

Description

technical field [0001] The invention relates to the field of solid waste recycling, in particular to synthesizing a functional material of modified sludge biomass charcoal loaded with zero-valent nano-iron particles, and studying the stability of sludge anaerobic digestion process by adding modified biomass charcoal composite materials In particular, it involves the use of biochar composites to increase the cumulative yield of methane from anaerobic digestion and reduce the ecotoxicity of heavy metals. Background technique [0002] With the continuous improvement of my country's sewage treatment capacity, a large amount of sludge is produced and accumulated in the environment as a by-product of the sewage treatment process. In recent years, an average of more than 25 million tons of sludge (80% water content) is produced every year. If not handled properly, it will cause serious pollution to the environment. Sludge is rich in organic matter that can be used as a resource an...

Claims

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Application Information

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