CN111732462A - Treating agent and method for anaerobic digestion of livestock and poultry manure - Google Patents
Treating agent and method for anaerobic digestion of livestock and poultry manure Download PDFInfo
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- CN111732462A CN111732462A CN202010468732.9A CN202010468732A CN111732462A CN 111732462 A CN111732462 A CN 111732462A CN 202010468732 A CN202010468732 A CN 202010468732A CN 111732462 A CN111732462 A CN 111732462A
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05D—INORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C; FERTILISERS PRODUCING CARBON DIOXIDE
- C05D1/00—Fertilisers containing potassium
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- C—CHEMISTRY; METALLURGY
- C05—FERTILISERS; MANUFACTURE THEREOF
- C05C—NITROGENOUS FERTILISERS
- C05C3/00—Fertilisers containing other salts of ammonia or ammonia itself, e.g. gas liquor
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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
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- 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
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- 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
- C05G5/00—Fertilisers characterised by their form
- C05G5/20—Liquid fertilisers
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- 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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- Treatment Of Sludge (AREA)
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Abstract
The invention discloses a treating agent and a method for anaerobic digestion of livestock and poultry manure, belonging to the technical field of resource utilization of livestock and poultry wastes. The treating agent for anaerobic digestion of the livestock and poultry manure is added in the anaerobic digestion of the livestock and poultry manure, so that the yield of soluble organic matters (DOM) and the proportion of humic acid in the treated livestock and poultry manure are both greatly improved, and the GI index (germination index) of plant seeds is greatly improved by using the treated livestock and poultry manure. The anaerobic digestion method for the livestock and poultry manure is simple in process and convenient to operate; after 45-60 days of anaerobic fermentation, the fertilizer can be directly used as an organic liquid fertilizer for plant growth, the dissolution of insoluble organic matters is promoted, the reduction of biogas residues can be realized, the plant growth can be promoted, and the application amount of the fertilizer can be reduced. The treated biogas slurry can be directly applied without being stored in an oxidation pond for 2-3 months, so that the occupied area of the oxidation pond is greatly saved.
Description
Technical Field
The invention belongs to the technical field of resource utilization of livestock industry wastes, and particularly relates to a treating agent and a method for anaerobic digestion of livestock and poultry manure.
Background
In recent years, with the adjustment of agricultural structures and the promotion of agricultural industrialization in China, the large-scale and intensive livestock and poultry breeding industry is rapidly developed and becomes the most active growth point and the main supporting industry in rural economy in China, and meanwhile, livestock and poultry manure becomes one of the main factors of non-point pollution in China.
Compared with industrial wastewater and domestic wastewater, the components of the livestock and poultry manure are single in source (feed, water and medicine) and only relate to a biological process (passing through abdomen), most of organic matters in the livestock and poultry manure are converted from animal intestines and stomach, and the biological toxicity is low. The organic matters and the generated elements such as nitrogen and phosphorus are necessary nutrient resources in agricultural production, if the livestock and poultry manure is recycled, the problems of serious pollution and high treatment cost of the breeding manure can be solved, the problem of insufficient organic matter nutrient resources of farmlands in China can be relieved, and the method has very important significance for promoting the green sustainable development of livestock and poultry breeding. However, most organic matters in the livestock and poultry manure are insoluble and are not easily utilized by plants, and if the organic matters are not treated and utilized but directly enter an agricultural production link, the growth of the plants cannot be promoted, but the organic matters can cause adverse effects on local water and soil environments, so that the problems of water eutrophication, soil hardening and the like are caused.
At present, anaerobic digestion is widely applied to the field of livestock and poultry manure treatment because the anaerobic digestion has the advantages of low cost and high efficiency in treating high-concentration organic wastewater and can generate methane with energy value. However, the large amount of biogas slurry generated after anaerobic digestion has poor bioavailability due to macromolecular organic substances composed of a lot of organic carbon, nitrogen, phosphorus and the like, and needs to be further treated and digested into organic components with small molecular weight by an oxidation pond for 2-3 months so as to be well utilized by plants. Therefore, a powerful and effective treating agent is needed to be adopted to quickly promote the hydrolysis of macromolecular organic matters in the livestock and poultry manure, increase the content of soluble micromolecular organic matters, promote the germination and growth of plant seeds and improve the nutrients and the biological effectiveness of the cultured manure.
Disclosure of Invention
Therefore, the invention aims to provide a treating agent for anaerobic digestion of livestock and poultry manure, which comprises an auxiliary agent and persulfate, wherein the molar ratio of the auxiliary agent to the persulfate is 1: 60-1: 80, and the auxiliary agent is sulfate.
In the treating agent, the auxiliary agent is one or more than two of sodium sulfate, potassium sulfate and ammonium sulfate.
In the treating agent, the persulfate is one or more of sodium persulfate, potassium hydrogen persulfate and ammonium persulfate.
An anaerobic digestion method for improving the nutrient and the biological effectiveness of livestock and poultry feces comprises the following steps:
(1) adjusting the solid content of the livestock and poultry manure, adding the treating agent into the livestock and poultry manure according to a certain proportion, and stirring for 20-30h at 20-40 ℃ to obtain mixed livestock and poultry manure;
(2) and (3) enabling the mixed livestock and poultry manure to enter a reactor and inoculating biogas residues for anaerobic digestion.
In the above method, the livestock and poultry manure refers to sewage and wastewater generated in the livestock and poultry breeding process, such as cattle manure, pig manure, chicken manure, duck manure, and a combination of two or more of the above.
In the method, the solid content of the livestock and poultry manure is 2-8 wt%.
In the method, the ratio of the addition amount of the treating agent to the solid content of the livestock and poultry manure is 0.2-0.4.
In the above method, preferably, the ratio of the addition amount of the treating agent to the solid content of the livestock and poultry manure is 0.3.
In the above method, the anaerobic digestion method comprises: the treatment time is 45-60 days at 20-40 ℃ and pH of 6-8.
In the method, the volume ratio of the livestock and poultry manure to the biogas residues is 3: 1-5: 1.
The invention has the following advantages and outstanding technical effects:
the treating agent for anaerobic digestion of the livestock and poultry manure is added in the anaerobic digestion of the livestock and poultry manure, so that the yield of soluble organic matters (DOM) and the proportion of humic acid in the treated livestock and poultry manure are both greatly improved, and the GI index (germination index) of plant seeds is greatly improved by using the treated livestock and poultry manure. The treating agent disclosed by the invention can reduce the use cost of the treating agent by adopting a mode of combining persulfate and a sulfate auxiliary agent, and increase the diversity of microbial communities in anaerobic digestion of livestock and poultry manure, so that the hydrolysis of macromolecular organic matters is promoted, and the treating agent is easy to store and transport.
The anaerobic digestion method for improving the nutrient and the biological effectiveness of the livestock and poultry manure has simple flow and convenient operation; after 45-60 days of anaerobic fermentation, the fertilizer can be directly used as an organic liquid fertilizer for plant growth, the dissolution of insoluble organic matters is promoted, the reduction of biogas residues can be realized, the plant growth can be promoted, and the application amount of the fertilizer can be reduced. The treated biogas slurry can be directly applied without being stored in an oxidation pond for 2-3 months, so that the occupied area of the oxidation pond is greatly saved.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to specific embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. The materials and devices used in the present invention are commercially available unless otherwise specified.
Example 1
Adjusting the solid content of the dairy cow breeding manure to be 3.5 wt%, and mixing the auxiliary agent potassium sulfate and potassium peroxodisulfate according to a molar ratio of 1:60 percent of the treating agent is mixed and put into the excrement to be used as a treating group, and the adding amount of the treating agent is 1.05 percent of the weight of the excrement (the ratio of the adding amount of the treating agent to the solid content of the excrement is 0.3). Stirring at 200rpm in an anaerobic reactor at 40 ℃ for 24 h. Adding the inoculated biogas residues into the reactor, wherein the inoculation volume is 25% of the dairy cow breeding manure, and carrying out anaerobic digestion at 35 ℃. And (3) taking the cow breeding excrement without the treatment agent as a control group, and performing anaerobic digestion.
After anaerobic digestion is carried out for 60 days, the DOM content of a control group is 14876mg/L, the humic acid proportion is 45%, and the GI index of a ten-fold diluted water sample is 0.35; the DOM content of the treatment group added with the treating agent is 17844mg/L, the humic acid proportion is 56 percent, and the GI index of a ten-fold diluted water sample is 0.66. The DOM of the treatment group is increased to 120 percent of that of the control group, the humic acid proportion is increased to 124 percent of that of the control group, and the GI index of the water sample diluted ten times is increased to 188 percent of that of the control group.
And the GI index is used for representing the phytotoxicity of the fermentation liquor, and the greater the GI index is, the smaller the phytotoxicity of the fermentation liquor is.
GI index measurement method is as follows:
(1) and (4) screening seeds. Putting the Shanghai green seeds into a culture dish, adding deionized water, slightly stirring for 30s by using a glass rod, skimming off the seeds floating on the water surface, and using the rest seeds for GI index measurement.
(2) A7 mL culture dish is taken, and 5mL of cow breeding water sample diluted by 10 times is transferred into the culture dish. A piece of quantitative filter paper with proper size is moved into a culture dish by a pair of tweezers, the filter paper is ensured to be free of air bubbles, 15 screened seeds are evenly placed in the filter paper, deionized water is used as a control, and the filter paper is cultured for 72 hours in a dark place at 25 ℃.
(3) Calculation of germination index GI:
GI (%)) treatment average root length — (control average germination rate) × 100.
And (3) characterizing the dissolved organic matter content DOM by using a dissolved organic carbon DOC, wherein the DOC is measured as follows:
DOC is measured by a Total Organic Carbon (TOC) analyzer, fermentation liquor is extracted from an anaerobic reactor, diluted by 40 times by deionized water, filtered by a 0.45 mu m water system filter membrane, and the filtrate is collected and then is measured on a computer.
The calculation process of the humic acid proportion is as follows:
(1) and scanning the water sample by using the three-dimensional fluorescence spectrum, and analyzing the soluble organic components of the water sample. The three-dimensional fluorescence spectrum is measured by using an F-7000 fluorescence spectrometer, and before measurement, the cow breeding wastewater is firstly diluted by 400 times and filtered by a 0.45 mu m water system filter head. In the test process, the blank water sample adopts Waha purified water, the light path length of the detection pool is a 1cm quartz cuvette, and the detection temperature is room temperature. The basic parameters of the assay were as follows: excitation light source: a 150W ammonia arc lamp; PMT voltage: 600V; and (3) grating crack: ex ═ 5nm, Em ═ 5 nm; the scanning mode is as follows: 1500 nm/min. The subject fluorescence scan range is Ex: 200-400 nm; and Em is 280-550 nm, and the scanning interval of both is 5 nm.
(2) With reference to the publication by Chen et al (Chen W, Westerhoff P, leenher J a, Booksh k. fluorescence acquisition-Emission Matrix essential Integration toquantum Spectra for dispersed Organic Matter [ J ]. environmental science & Technology,2003,37(24):5701-5710.), the resulting fluorescence data was volume-integrated by region to determine the percentage of five types of fluorescent Organic Matter including humic-like acids.
Example 2
Adjusting the solid content of the pig farm manure to be 3.0 wt%, and mixing the auxiliary agents of sodium sulfate and sodium peroxodisulfate according to a molar ratio of 1: 65 as a treatment group, the adding amount of the treating agent is 0.65 wt% of the feces (the ratio of the adding amount of the treating agent to the solid content of the feces is 0.22). Stirring at 200rpm in an anaerobic reactor at 40 ℃ for 24 h. The reactor was charged with inoculated biogas residue at an inoculation volume of 30% of the pig farm manure and subjected to anaerobic digestion at 35 ℃. Anaerobic digestion was also carried out using pig farm manure without treatment as a control.
After 60 days, the DOM content of the control group is 5632mg/L, the humic acid proportion is 39%, and the GI index is 0.36; the DOM content of the treated group was 7526mg/L, the humic acid content was 47%, and the GI index was 0.57. The DOM of the treatment group is increased to 134 percent of that of the control group, the humic acid proportion is increased to 121 percent of that of the control group, and the GI index is increased to 158 percent of that of the control group.
Example 3
Adjusting the solid content of the dung in the chicken house to be 5.0 wt%, and mixing the auxiliary agents of ammonium sulfate and ammonium peroxodisulfate according to a molar ratio of 1: 70, the mixture is added into the excrement to be used as a treatment group, and the adding amount of the treatment agent is 1.0 wt% of the excrement (the ratio of the adding amount of the treatment agent to the solid content of the excrement is 0.20). Stirring at 200rpm in an anaerobic reactor at 40 ℃ for 24 h. The inoculated biogas residue was added to the reactor at an inoculation volume of 25% of the chicken house manure and subjected to anaerobic digestion at 35 ℃. Anaerobic digestion was also carried out using chicken house manure without treatment as a control.
After 60 days, the DOM content of the control group is 4963mg/L, the humic acid proportion is 51 percent, and the GI index is 0.43; the DOM content of the treated group was 6735mg/L, the humic acid proportion was 59%, and the GI index was 0.73. The DOM of the treatment group is increased to 136 percent of that of the control group, the humic acid proportion is increased to 116 percent of that of the control group, and the GI index is increased to 170 percent of that of the control group.
The above examples are merely illustrative for clarity and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The treating agent for anaerobic digestion of livestock and poultry manure is characterized by comprising an auxiliary agent and persulfate, wherein the molar ratio of the auxiliary agent to the persulfate is 1: 60-1: 80, and the auxiliary agent is sulfate.
2. The treating agent according to claim 1, wherein the auxiliary is one or more of sodium sulfate, potassium sulfate and ammonium sulfate.
3. The agent according to claim 1, wherein the persulfate is one or more of sodium persulfate, potassium persulfate, oxone and ammonium persulfate.
4. An anaerobic digestion method for improving the nutrient and the biological effectiveness of livestock and poultry feces is characterized by comprising the following steps:
(1) adjusting the solid content of the livestock and poultry manure, adding the treating agent of any one of claims 1-3 into the livestock and poultry manure according to a certain proportion, and then stirring for 20-30h at 20-40 ℃ to obtain mixed livestock and poultry manure;
(2) and (3) enabling the mixed livestock and poultry manure to enter a reactor and inoculating biogas residues for anaerobic digestion.
5. The method of claim 4, wherein the livestock and poultry manure is sewage and wastewater generated in the livestock and poultry breeding process.
6. The method according to claim 4, wherein the solid content of the livestock and poultry manure is 2-8 wt%.
7. The method according to claim 4, wherein the ratio of the addition amount of the treating agent to the solid content of the livestock and poultry manure is 0.2-0.4.
8. The method as claimed in claim 7, wherein the ratio of the addition amount of the treating agent to the solid content of the livestock and poultry manure is 0.3.
9. The method of claim 4, wherein the method of anaerobic digestion is: the treatment time is 45-60 days at 20-40 ℃ and pH of 6-8.
10. The method according to claim 4, wherein the volume ratio of the livestock and poultry manure to the biogas residue is 3: 1-5: 1.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112457093A (en) * | 2020-12-08 | 2021-03-09 | 广西大学 | Method for promoting degradation of organic matters in compost |
| CN113277608A (en) * | 2021-06-17 | 2021-08-20 | 中国农业大学 | Method for quickly and stably recycling biogas slurry |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043688A (en) * | 1988-12-23 | 1990-07-11 | 广西农学院中心实验室 | Compound accelerator for anaerobic digestion and production technique thereof |
| US20140335602A1 (en) * | 2013-05-10 | 2014-11-13 | Innovative Environmental Technologies, Inc. | Chemical oxidation and biological attenuation process for the treatment of contaminated media |
| CN108624623A (en) * | 2018-06-13 | 2018-10-09 | 湖南大学 | A method of strengthening residual active sludge hydrogen production through anaerobic fermentation |
| CN110240352A (en) * | 2019-05-15 | 2019-09-17 | 生态环境部南京环境科学研究所 | A kind of method of thermal activation persulfate removal water body Chlorpyrifos |
-
2020
- 2020-05-28 CN CN202010468732.9A patent/CN111732462A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043688A (en) * | 1988-12-23 | 1990-07-11 | 广西农学院中心实验室 | Compound accelerator for anaerobic digestion and production technique thereof |
| US20140335602A1 (en) * | 2013-05-10 | 2014-11-13 | Innovative Environmental Technologies, Inc. | Chemical oxidation and biological attenuation process for the treatment of contaminated media |
| CN108624623A (en) * | 2018-06-13 | 2018-10-09 | 湖南大学 | A method of strengthening residual active sludge hydrogen production through anaerobic fermentation |
| CN110240352A (en) * | 2019-05-15 | 2019-09-17 | 生态环境部南京环境科学研究所 | A kind of method of thermal activation persulfate removal water body Chlorpyrifos |
Non-Patent Citations (2)
| Title |
|---|
| 刘希涛: "《活化过硫酸盐在环境污染控制中的应用》", 31 May 2018, 中国环境科学出版社 * |
| 常文韬: "《农业废弃物资源化利用技术示范与减排效应分析》", 31 January 2018, 天津大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112457093A (en) * | 2020-12-08 | 2021-03-09 | 广西大学 | Method for promoting degradation of organic matters in compost |
| CN113277608A (en) * | 2021-06-17 | 2021-08-20 | 中国农业大学 | Method for quickly and stably recycling biogas slurry |
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