Method for producing biogas through combined anaerobic fermentation of pig farm manure water treated by biochar-loaded nanoscale zero-valent iron and corn straws

A technology of nano-zero-valent iron and corn stalks, which is applied in the field of resource utilization of agricultural waste, can solve the problems of low gas production rate and long fermentation cycle, and achieve the goal of improving gas production efficiency, increasing methane content, and improving gas production efficiency Effect

Pending Publication Date: 2021-09-17
RURAL ENERGY & ENVIRONMENTAL PROTECTION INST OF HEILONGJIANG ACAD OF AGRI SCI
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Problems solved by technology

[0006] In view of this, the purpose of the present invention is to provide a method for producing biogas through combined anaerobic fermentation of pig farm manure treated with nano-zero-valent iron loaded with biochar and corn stalks, so as to solve the problems of long fermentation period and Technical problem of low gas production rate

Method used

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  • Method for producing biogas through combined anaerobic fermentation of pig farm manure water treated by biochar-loaded nanoscale zero-valent iron and corn straws
  • Method for producing biogas through combined anaerobic fermentation of pig farm manure water treated by biochar-loaded nanoscale zero-valent iron and corn straws

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Embodiment 1

[0057] Biochar is obtained from corn straw by oxygen-limited pyrolysis at 400°C (Tao Mengjia. Preparation and modification of straw biochar and research on the adsorption efficiency of nitrogen and phosphorus in water [D]. Harbin Institute of Technology, 2018. Dissertation) , Nano-sized zero-valent iron loaded on biochar is prepared by pyrolysis-liquid phase reduction method (Zhu Qingtao, Wu Xiaoyi, Guo Qihui, et al. Research progress on the preparation of nano-sized zero-valent iron loaded on biochar and its removal of pollutants in water[J].Energy Chemical Industry, 2018, 39(04):73-77).

[0058] In this example, the method of anaerobic fermentation of pig farm manure treated with nano-zero-valent iron loaded with biochar and corn stalks to produce biogas is realized in the following steps:

[0059] Step 1. Filter the pig farm manure to remove impurities such as sand and plastic, and put it into a plastic bucket for later use.

[0060] Step 2, crushing the corn stalks to 1-3...

Embodiment 2

[0068] In this example, the method of anaerobic fermentation of pig farm manure treated with nano-zero-valent iron loaded with biochar and corn stalks to produce biogas is realized in the following steps:

[0069] Step 1. Filter the pig farm manure to remove impurities such as sand and plastic, and put it into a plastic bucket for later use;

[0070] Step 2, crushing the corn stalks to 1-3 cm, and drying the crushed corn stalks to a constant weight by using a blast drying oven;

[0071] Step 3. Fill the pig farm manure water into 500mL serum bottles, and fill each serum bottle with 372 mL;

[0072] Step 4: Put 30mg of biochar-loaded nano-zero-valent iron into a 500mL serum bottle, and quickly place the serum bottle in an air bath constant temperature oscillator at 35.0±0.5°C at a frequency of 80rpm for 24h;

[0073]Step 5. Weigh 28 g of dried corn stalks, put them into the serum bottle of step 4, store them at medium temperature for 3 days, add 40 mL of active strains of 40 m...

Embodiment 3

[0078] In this example, the method of anaerobic fermentation of pig farm manure treated with nano-zero-valent iron loaded with biochar and corn stalks to produce biogas is realized in the following steps:

[0079] Step 1. Filter the pig manure water to remove impurities such as sand and plastic, and put it into a plastic bucket for later use;

[0080] Step 2, crushing the corn stalks to 1-3 cm, and drying the crushed corn stalks to a constant weight by using a blast drying oven;

[0081] Step 3: Fill pig manure water into 500mL serum bottles, and fill each serum bottle with 368 mL.

[0082] Step 4: Put 50mg of biochar-loaded nano-zero-valent iron into a 500mL serum bottle, and quickly place the serum bottle in an air bath constant temperature oscillator at 35.0±0.5°C at a frequency of 100rpm for 36h.

[0083] Step 5. Weigh 32g of dried corn stalks, put them into the serum bottle of step 4, store at medium temperature for 3 days, add 40mL of active bacteria, add water to adjus...

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Abstract

The invention belongs to the field of agricultural waste recycling utilization, and relates to a method for producing biogas through combined anaerobic fermentation of pig farm manure water treated by biochar-loaded nanoscale zero-valent iron and corn straws. The method comprises the following steps of: (1) filtering the pig farm manure water to remove impurities; (2) crushing the corn straws to 1-3cm in length, and drying the corn straws to constant weight; (3) processing the pig farm manure water by the biochar-loaded nanoscale zero-valent iron, and carrying out vibration treatment; (4) uniformly mixing dried straw materials with the pig farm manure water obtained in the step (3), and storing for 2-3 days under a medium temperature condition; and (5) adding an active strain into the mixture obtained in the step (4) according to the total volume of the fermentation material liquid, adding water according to the total mass of the fermentation material liquid to adjust the content of dry matters (TS) of the corn straws to be 6-8%, adjusting the pH value of the fermentation material liquid to be 6-8, and carrying out medium-temperature combined anaerobic fermentation. The method provided by the invention can improve gas production efficiency and shorten the fermentation period.

Description

technical field [0001] The invention belongs to the field of resource utilization of agricultural waste, and relates to a method for producing biogas through combined anaerobic fermentation of pig farm manure treated with nano-zero-valent iron loaded with biochar and corn stalks. Background technique [0002] As we all know, anaerobic fermentation biogas technology is currently one of the most commonly used technologies for treating this type of aquaculture wastewater and various agricultural wastes. However, the gas production efficiency of pig farm wastewater is low, and it is difficult to realize economic value. If pig farm manure and crop straw are used to produce biogas through anaerobic fermentation, the gas production efficiency can be greatly improved. Existing studies have shown that the joint anaerobic fermentation technology of two or more organic materials can not only realize the normalized treatment of different organic wastes, but also significantly improve th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C12P5/02C02F11/04
CPCC12P5/023C02F11/04Y02W30/40Y02A40/20Y02E50/30
Inventor 裴占江刘杰王粟史风梅李鹏飞于秋月
Owner RURAL ENERGY & ENVIRONMENTAL PROTECTION INST OF HEILONGJIANG ACAD OF AGRI SCI
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