CN115246754A - Method for reducing greenhouse gas emission in composting process - Google Patents

Method for reducing greenhouse gas emission in composting process Download PDF

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Publication number
CN115246754A
CN115246754A CN202110810872.4A CN202110810872A CN115246754A CN 115246754 A CN115246754 A CN 115246754A CN 202110810872 A CN202110810872 A CN 202110810872A CN 115246754 A CN115246754 A CN 115246754A
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compost
composting
greenhouse gas
manganese ore
composting process
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CN202110810872.4A
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姜志翔
周顺熙
孔范龙
张采月
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Qingdao University
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Qingdao University
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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
    • C05D9/00—Other inorganic fertilisers
    • C05D9/02—Other inorganic fertilisers containing trace elements
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
    • C05F17/10—Addition or removal of substances other than water or air to or from the material during the treatment
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05G—MIXTURES OF FERTILISERS COVERED INDIVIDUALLY BY DIFFERENT SUBCLASSES OF CLASS C05; MIXTURES OF ONE OR MORE FERTILISERS WITH MATERIALS NOT HAVING A SPECIFIC FERTILISING ACTIVITY, e.g. PESTICIDES, SOIL-CONDITIONERS, WETTING AGENTS; FERTILISERS CHARACTERISED BY THEIR FORM
    • C05G3/00—Mixtures of one or more fertilisers with additives not having a specially fertilising activity
    • C05G3/80—Soil conditioners
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Biotechnology (AREA)
  • Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • General Chemical & Material Sciences (AREA)
  • Microbiology (AREA)
  • Molecular Biology (AREA)
  • Soil Sciences (AREA)
  • Fertilizers (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The invention discloses a method for reducing greenhouse gas emission in a composting process, and belongs to the field of organic waste resource utilization. The method comprises the following steps: 1) Adding manganese ore into the organic waste, and uniformly mixing to obtain a compost material; 2) Composting the compost material obtained in the step 1); 3) Turning the compost when the compost is in a high-temperature period (more than 50 ℃) to uniformly mix the compost; 4) And when the composting temperature is reduced to the ambient temperature, air-drying, crushing and sieving the obtained compost to obtain the organic fertilizer product. The invention adds manganese ore into the compost, obviously reduces the greenhouse gas (N) in the composting process 2 O and CH 4 ) And the humification degree of the compost is improved. Not only is beneficial to relieving global warming, but also improves the quality of compost products. The invention has good effect and low cost, and is suitable for large-scale application.

Description

Method for reducing greenhouse gas emission in composting process
Technical Field
The invention relates to the field of organic waste resource utilization, in particular to a method for reducing greenhouse gas emission in a composting process.
Background
Urbanization and population growth have resulted in an increasing organic waste becoming a global problem, and improper disposal of organic waste can lead to deterioration of air, water and soil. Composting can reduce the amount of organic waste, destroy weed seeds and pathogens, and can also convert organic waste into soil amendments to improve soil function and increase crop yield, considered to be the recycling of organic wasteThe preferred method of (1). However, oxygen deficiency during composting due to caking of materials and inadequate aeration can lead to greenhouse gases (N) 2 O、CH 4 Etc.) are discharged in large quantities. N is a radical of 2 O and CH 4 Is an important source of artificial greenhouse gases, and IPCC reports that the Global Warming Potential (GWP) is CO 2 28.5 and 264.8 times. In addition, the carbon and nitrogen losses caused by the emission of greenhouse gases in the composting process account for 10.0 percent and 2.0 to 3.0 percent of the total nitrogen and the total carbon of the compost respectively. This not only aggravates environmental pollution, but also leads to a decrease in the quality of the compost. Thus, N in the composting process is reduced 2 O and CH 4 The emissions of (b) are of great significance in alleviating global warming and improving compost quality.
At present, certain achievements are achieved for reducing the emission of greenhouse gases in the composting process by adjusting the aeration rate, the turning frequency and the stacking density. However, the technology employed and the large variation in production scale make optimization of composting parameters impractical or infeasible. In addition, the reduction of greenhouse gas emissions during composting by the addition of exogenous materials has also received great attention. For example, CN106083331a discloses a method of adding modified biochar; CN109650953A discloses a method of adding alkali lignin; CN105523804A discloses a method for adding calcium superphosphate. However, it is difficult to apply to compost on a large scale in actual production due to problems in production process or production cost. Therefore, it is necessary to develop a simple, economical and applicable greenhouse gas emission reduction method.
Manganese ore is widely present in nature as a natural mineral, and manganese dioxide, which is a main component thereof, has a strong oxidizing property, and it is presumed that manganese ore can reduce greenhouse gas emission by improving the compost redox environment. At present, no report is made on the application of manganese ore to compost to reduce greenhouse gas emissions.
Disclosure of Invention
The invention aims to provide a method for reducing greenhouse gas emission in a composting process. Based on the characteristic that manganese ore can be used as an electron acceptor under anaerobic conditions, the invention can obviously improve the oxidation-reduction environment of compost after being added into compost materials and inhibit the generation of N 2 O and CH 4 And promoting the consumption of N 2 O and CH 4 The microbial activity of the fertilizer, and further reduces the emission of greenhouse gases in the composting process.
The invention specifically comprises the following steps:
1) Adding manganese ore into the organic waste, and uniformly mixing to obtain a compost material;
2) Composting the compost material obtained in the step 1);
3) Turning and mixing the compost uniformly when the compost is in a high-temperature period (more than 50 ℃);
4) And when the composting temperature is reduced to the ambient temperature, air-drying, crushing and sieving the obtained compost to obtain the organic fertilizer product.
Preferably, the manganese dioxide content in the manganese ore is 20 to 40%.
Preferably, the manganese ore is crushed and sieved by a sieve of 60 to 100 meshes.
Preferably, the mass ratio of the manganese ore to the organic waste is (0.01-0.1) to 1.
Preferably, the organic waste is sewage sludge, livestock and poultry manure.
Preferably, straw is added to the compost material as a filler material.
Preferably, the carbon-nitrogen ratio and the water content of the compost material are respectively adjusted to be (20-30) to 1 and 55-65%.
Preferably, the aerobic composting is carried out by adopting forced aeration in the step 2), and the aeration rate is 0.05-0.3L min -1 kg -1 Dry weight.
Preferably, the pile-turning frequency in the step 3) is 3 to 5 days/time.
The invention has the following specific advantages:
1. the invention creatively adds the manganese ore into the compost, and obviously reduces the greenhouse gas (N) in the composting process 2 O and CH 4 ) The discharge of the compost is improved, the humification degree of the compost is improved, the global warming is favorably relieved, and the quality of compost products is improved.
2. The manganese ore used in the invention is widely available in nature, does not cause secondary pollution, has low dosage and low cost, and is easy to popularize.
Drawings
FIG. 1 is a graph showing temperature changes in composting processes of examples 1 to 4 and comparative example 1;
FIG. 2 is a graph showing the change in greenhouse gas emission in the composting processes of examples 1 to 4 and comparative example 1;
FIG. 3 is a graph showing the changes in functional genes involved in greenhouse gas emission in the composting processes of examples 1 to 4 and comparative example 1;
FIG. 4 is a graph showing the change in germination index during composting in examples 1 to 4 and comparative example 1.
Detailed Description
To achieve the objects, aspects and advantages of the present invention, the present invention will be further described with reference to the following embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention. The invention is not limited in any way and any modification or improvement based on the present invention is within the protection scope of the present invention.
The invention provides a method for reducing greenhouse gas emission in a composting process, which comprises the following specific implementation steps:
1) Adding manganese ore into the organic waste, and uniformly mixing to obtain a compost material;
2) Composting the compost material obtained in the step 1);
3) Turning the compost when the compost is in a high-temperature period (more than 50 ℃) to uniformly mix the compost;
4) And when the composting temperature is reduced to the ambient temperature, air-drying, crushing and sieving the obtained compost to obtain the organic fertilizer product.
The following examples and comparative examples were conducted by the following methods for measuring the indices:
1. measurement of composting temperature:
using an engineering electronic thermometer, compost temperatures were measured at depths of 10cm,20cm and 30cm at 9 am, respectively, and averaged every day.
2. And (3) greenhouse gas determination:
100mL of gas was extracted from the closed compost reactor at 10 o' clock each day using a sterile syringe, stored in an aluminum-plastic composite membrane gas storage bag, and the concentration of greenhouse gas was measured using a gas chromatograph (7890B, agilent technologies, USA). The greenhouse gas emission rate was calculated as follows:
wherein V emit Is the gas discharge rate (g kg) -1 d -1 ) (ii) a Q is aeration rate (L kg) -1 min -1 )；G out Outlet gas concentration (ppmv); g in As gas inlet gas concentration (ppmv); v m Is the molar volume of the gas (L mol) under standard conditions -1 )；M gas Is the molar mass (g mol) of the gas -1 )。
3. Determination of germination index:
mixing fresh compost sample with deionized water at a ratio of 1: 10 (W: V), placing in a constant temperature shaking box for 200r min -1 Oscillating for 1h under the condition, centrifuging and filtering to obtain compost filtrate. Selecting full and uniform wheat seeds, performing a seed germination experiment by respectively taking filtrate and deionized water as a control group and a blank group, and determining the seed germination rate and the root length after 72 hours, wherein the germination index calculation formula is as follows:
example 1
Filter-pressing the residual sludge of the sewage treatment plant until the water content is about 70 percent, and crushing the corn stalks into particles with the particle size of 1-1.5 cm for later use; mixing the sludge and the corn straws according to the dry mass ratio of 1: 1 to adjust the carbon-nitrogen ratio and the water content of the compost to be 20 and 60 percent, simultaneously adding corn straw biochar which accounts for 10 percent of the dry mass of the mixture of the sludge and the corn straws as a modifier, and uniformly mixing to obtain a compost mixture; adding the compost mixture into a compost reactor, and aerating with an aeration pump at an aeration rate of 0.2L kg -1 min -1 Aerating under the condition of dry matter to maintain an aerobic composting environment, and piling for 42 days to obtain mature compost; when the compost is in a high-temperature period (more than 50 ℃), turning the compost once every 3 to 5 days to uniformly mix the compost; taking out the compost from the reactor after 42 days, spreading out, air drying, crushing and sieving to obtain compost products, recordingIs T1. Monitoring compost temperature, CH, daily during composting 4 And N 2 O emission, and the germination index and the contents of humic, fulvic and humic acids of the compost were tested.
Example 2
The specific operating procedures and composting conditions of example 2 were identical to those of example 1, except that 10% of bamboo charcoal, designated as T2, was added as a modifier in example 2.
Example 3
The specific operation steps and composting conditions of example 3 were identical to those of example 1, except that 1.5% of manganese ore, denoted as T3, was added as a modifier in example 3.
Example 4
The specific operation steps and composting conditions of example 4 are the same as those of example 1, except that 1.5% of manganese ore and 10% of corn stalk biochar are added as modifiers, which are marked as T4, in example 4.
Comparative example 1
The specific procedures and composting conditions of comparative example 1 were the same as those of example 1, except that no modifier, designated CK, was added to comparative example 1.
As can be seen from FIG. 1, the composting temperatures of examples 1 to 4 and comparative example 1 were close to ambient temperature at the end of composting, indicating that the compost has matured;
as can be seen from FIG. 2, the total amount of CH4 emissions of examples 1 to 4 were significantly reduced by 56.52%, 37.3%, 71.24% and 33.60%, respectively, N, as compared to comparative example 1 2 The total amount of O emissions was significantly reduced by 31.31%, 6.6%, 23.46%, and 45.90%, and the Global Warming Potential (GWP) was significantly reduced by 39.31%, 21.21%, 38.53%, and 42.13%. In particular, the addition amount of manganese ore is only 1.5%, while the addition amount of biochar is 10%. In conclusion, the results show that the invention can effectively reduce the emission of greenhouse gases in the composting process;
as can be seen from FIG. 3, manganese ore can significantly reduce the content of N in the composting process 2 O and CH 4 Production of related functional gene abundance and increase of N-related functional gene abundance 2 O and CH 4 Depletion of related functional genesDegree of nitrogen in the composting process 2 O and CH 4 Discharging of (3);
as can be seen from fig. 4, manganese ore accelerates the composting process, significantly reducing the phytotoxicity of the compost. The manganese ore is shown to reduce the emission of greenhouse gases in the composting process and be beneficial to improving the composting quality.

Claims (8)

1. A method for reducing greenhouse gas emissions during composting, comprising the steps of:
1) Adding manganese ore into the organic waste, and uniformly mixing to obtain a compost material;
2) Composting the compost material obtained in the step 1);
3) Turning the compost when the compost is in a high-temperature period (more than 50 ℃) to uniformly mix the compost;
4) And when the composting temperature is reduced to the environmental temperature, air-drying, crushing and sieving the obtained compost to obtain the organic fertilizer product.
2. A method of reducing greenhouse gas emissions from a composting process as claimed in claim 1 wherein: the manganese ore in the step 1) comprises natural manganese ore and a manganese dioxide-rich product obtained by processing manganese ore.
3. A method of reducing greenhouse gas emissions from a composting process as claimed in claim 1 wherein: the manganese dioxide content in the manganese ore in the step 1) is 10-40%.
4. A method of reducing greenhouse gas emissions from a composting process as claimed in claim 1 wherein: the particle size of the manganese ore in the step 1) is 0.1-2 mm.
5. A method of reducing greenhouse gas emissions from a composting process as claimed in claim 1 wherein: the mass ratio of the manganese ore to the organic waste in the step 1) is (0.005-0.1) to 1.
6. A method of reducing greenhouse gas emissions from a composting process as claimed in claim 1 wherein: in the step 1), the carbon-nitrogen ratio and the water content of the compost material are respectively adjusted to be (20-30) to 1 and 55-65 percent.
7. A method of reducing greenhouse gas emissions from a composting process as claimed in claim 1 wherein: in the step 2), forced aeration is adopted for aerobic composting, and the aeration rate is 0.05-0.3L kg -1 min -1 Dry weight.
8. A method of reducing greenhouse gas emissions from a composting process as claimed in claim 1 wherein: the frequency of turning the pile in the step 3) is 3 to 5 days per time.
CN202110810872.4A 2021-07-11 2021-07-11 Method for reducing greenhouse gas emission in composting process Pending CN115246754A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105523804A (en) * 2014-09-28 2016-04-27 中国农业大学 Compost preparation method with reduced greenhouse gas emission
CN106220261A (en) * 2016-07-13 2016-12-14 中国农业大学 A kind of method of chicken manure aerobic compost
CN108821821A (en) * 2018-08-28 2018-11-16 福建农林大学 A kind of aerobic composting device and method of magnetic field auxiliary
CN112500207A (en) * 2020-12-24 2021-03-16 中国科学院遗传与发育生物学研究所农业资源研究中心 Additive for realizing synergistic emission reduction of ammonia gas and greenhouse gas in composting process and application thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105523804A (en) * 2014-09-28 2016-04-27 中国农业大学 Compost preparation method with reduced greenhouse gas emission
CN106220261A (en) * 2016-07-13 2016-12-14 中国农业大学 A kind of method of chicken manure aerobic compost
CN108821821A (en) * 2018-08-28 2018-11-16 福建农林大学 A kind of aerobic composting device and method of magnetic field auxiliary
CN112500207A (en) * 2020-12-24 2021-03-16 中国科学院遗传与发育生物学研究所农业资源研究中心 Additive for realizing synergistic emission reduction of ammonia gas and greenhouse gas in composting process and application thereof

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
JUNQIU WU ETC: "How does manganese dioxide affect humus formation during bio-composting of chicken manure and corn straw?" *
吴娟;何胜洲;李国学;李朝晖;包一凡;梁英;: "添加过磷酸钙的猪粪堆肥污染气体减排工艺优化" *
明中远: "基于市政污泥好氧堆肥过程的强化腐殖化技术研究" *
李舒清等: "接种复合菌剂对牛粪好氧堆肥进程及温室气体(CH4和N2O)排放的影响" *
杨帆;李国学;江滔;张宝莉;: "蚯蚓辅助堆肥处理蔬菜废弃物及其温室气体减排效果" *

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