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Method capable of improving methane yield in sludge anaerobic digestion process and enhancing heavy metal stabilization process

An anaerobic digestion and heavy metal technology, applied in the direction of physical/chemical process catalysts, other chemical processes, chemical instruments and methods, etc., can solve the problems of affecting the efficiency of sludge anaerobic digestion, reducing the activity of methane bacteria, and limited organic matter content, etc. Achieve superior adsorption performance, uniform distribution, and high specific surface area

Inactive Publication Date: 2017-09-01
TONGJI UNIV
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Problems solved by technology

However, the organic matter content in sludge is limited and the carbon-to-nitrogen ratio (C / N) is low, resulting in a large accumulation of volatile fatty acids (VFA) and ammonia nitrogen during anaerobic digestion, reducing the activity of methane bacteria and affecting sludge anaerobic digestion. s efficiency

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  • Method capable of improving methane yield in sludge anaerobic digestion process and enhancing heavy metal stabilization process
  • Method capable of improving methane yield in sludge anaerobic digestion process and enhancing heavy metal stabilization process
  • Method capable of improving methane yield in sludge anaerobic digestion process and enhancing heavy metal stabilization process

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Embodiment １

[0028] Embodiment 1: The specific steps of this embodiment are as follows:

[0029] Activated carbon pretreatment: straw soaked in ZnCl 2 activation in solution (straw and ZnCl 2 The mass ratio is 1:2), centrifuged after magnetic stirring for 7 hours (4000r min -1 ), oven-dried. After drying, the samples were carbonized for 180 min in an OTF-1200x vacuum tube furnace. Set the carbonization temperature to 550°C, N 2 As protective gas, the heating rate is 20°C min -1 . The prepared crude samples were washed repeatedly with deionized water and dried at low temperature to constant weight.

[0030] Preparation of activated carbon (BC-MnO) loaded with MnO nanomaterials: the pretreated activated carbon was ground through a 100-mesh sieve, and 6 g of activated carbon was soaked in KMnO 4 solution, making BC and KMnO 4 The mass ratio is 1:15. The suspension was sonicated at room temperature for 3 hours and then dried in an oven. After drying, it was transferred to a tube furna...

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Abstract

The invention relates to a method capable of improving methane yield in a sludge anaerobic digestion process and enhancing heavy metal stabilization process. According to the method, corn stalk is utilized as a raw material to prepare stalk activated carbon under nitrogen protection and pyrolysis temperature of 550 DEG C; the stalk activated carbon is utilized as a carrier to react with a KMnO4 solution to finally obtain a nano MnO loaded activated carbon function material; in a sludge anaerobic digestion acid production stage, the nano MnO loaded activated carbon function material is added into an anaerobic reaction detection according to a proportion, cumulative gas production of methane in the sludge anaerobic digestion process is obviously improved, free-state heavy metal in the sludge can be effectively adsorbed and processed in a complexation mode at the same time, biological validity and mobility of the heavy metal are reduced, and the heavy metal stabilization process is enhanced. The method disclosed by the invention can be applied to residual sludge anaerobic digestion of urban sewage treatment plants, effectively improves the cumulative gas production of the methane, reduces biological validity of the heavy metal in the sludge anaerobic digestion process and enhances the heavy metal stabilization process.

Description

technical field [0001] The invention belongs to the field of environmental technology protection, and specifically relates to synthesizing a functional material of activated carbon loaded with nano-MnO particles, and adding this material to the process of sludge mesothermal anaerobic digestion, and studying the process of sludge anaerobic digestion after adding the functional material. Effect of heavy metal speciation and gas production. Background technique [0002] With the increase of domestic urban wastewater discharge, a large amount of excess sludge is produced and discharged into the natural environment. As of September 2010, my country has built 2630 sewage treatment plants, with a daily sewage treatment capacity of 1.2×10 8 m 3 , about 11.2×10 output per day 7 t of dry sludge, and the amount of sludge produced is expected to grow at a rate of 10% per year. Therefore, how to scientifically treat and dispose of sludge is one of the urgent problems in the environme...

Claims

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Application Information

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IPC IPC(8): C02F11/04B01J20/20B01J23/34C05G1/00C02F101/20
CPCB01J20/20B01J23/34B01J2220/4825C02F11/04C02F2101/20C02F2305/023C02F2305/06C05D9/00C05D9/02C05F7/00Y02E50/30
Inventor 杨长明张敏
Owner TONGJI UNIV
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