CN111233576A - Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field - Google Patents

Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field Download PDF

Info

Publication number
CN111233576A
CN111233576A CN202010106232.0A CN202010106232A CN111233576A CN 111233576 A CN111233576 A CN 111233576A CN 202010106232 A CN202010106232 A CN 202010106232A CN 111233576 A CN111233576 A CN 111233576A
Authority
CN
China
Prior art keywords
liquid
biogas slurry
fertilizer
hydrothermal carbon
hydrothermal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202010106232.0A
Other languages
Chinese (zh)
Other versions
CN111233576B (en
Inventor
冯彦房
李德天
薛利红
杨林章
段婧婧
何华勇
何世颖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jiangsu Academy of Agricultural Sciences
Original Assignee
Jiangsu Academy of Agricultural Sciences
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jiangsu Academy of Agricultural Sciences filed Critical Jiangsu Academy of Agricultural Sciences
Priority to CN202010106232.0A priority Critical patent/CN111233576B/en
Publication of CN111233576A publication Critical patent/CN111233576A/en
Application granted granted Critical
Publication of CN111233576B publication Critical patent/CN111233576B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C9/00—Fertilisers containing urea or urea compounds
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C21/00—Methods of fertilising, sowing or planting
    • A01C21/005—Following a specific plan, e.g. pattern

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Environmental Sciences (AREA)
  • Fertilizers (AREA)

Abstract

The invention relates to a method for matching biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizers and reduce ammonia volatilization of rice fields, which comprises the following steps: 1) pretreating biogas slurry to obtain biogas slurry fertilizer; 2) preparing hydrothermal carbon pyrolysis liquid: mixing straws with water, and carrying out hydrothermal carbonization in a high-pressure reaction kettle, wherein the hydrothermal reaction product comprises solid hydrothermal carbon and a liquid product, and the liquid product is hydrothermal carbon pyrolysis liquid; 3) mixing biogas slurry fertilizer and hydrothermal carbon pyrolysis liquid according to the ratio of 100: 5-30 volume ratio, and applying the mixture as a composite liquid fertilizer to the paddy field. Compared with the prior art, the invention has the beneficial effects that: in the invention, the application of carbon liquid and biogas liquid to replace 50% of nitrogen fertilizer obviously reduces NH3And (4) volatilizing and accumulating the discharge amount.

Description

Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field
Technical Field
The invention relates to a method for replacing a chemical fertilizer and reducing ammonia volatilization in a rice field by matching biogas slurry and hydrothermal carbon pyrolysis liquid.
Background
The application of nitrogen fertilizer greatly improves the yield of grain crops, but the excessive use of nitrogen fertilizer can also cause serious environmental problems. Research shows that the nitrogen loss of the fertilizer is between 30 and 70 percent, wherein ammonia (NH) is used3) The form is volatilized into the air (i.e. NH)3Volatizing) is one of the major pathways for soil nitrogen loss. Rice is one of the world's leading food crops, while rice field is the NH in the atmosphere3Is one of the main human sources. Research shows that NH3The volatilization can account for 15 to 40 percent of the nitrogen application amount in the rice field, thereby causing great economic loss; into the NH of the atmosphere3Plays an important role in an ecological system, can induce atmospheric haze and boost greenhouse effect, and also has NH3A series of environmental problems such as water eutrophication and the like can be caused by dry and wet sedimentation. Thus, realizing the paddy field NH3The volatilization emission reduction has important economic and ecological significance.
Anaerobic fermentation is an excellent method for producing biogas, which is also applicable to organic waste, such as manure, food residues, sludge and municipal organic solid waste. In the anaerobic fermentation process, besides the production of biogas (containing carbon dioxide and methane), the remaining complex organic matter, such as lignin and inorganic fractions, including N, P, K, remains in the biogas slurry. It must be disposed of reasonably to avoid environmental risks caused by improper discharge. Researches show that the biogas slurry can be used as fertilizer in agriculture after being treated. The use of biogas slurry fertilizer in agriculture can reduce the use of nitrogen fertilizer, thereby improving the resource utilization rate, slowing down the climate change and maintaining the soil quality. However, the biogas slurry contains ammonium radicals with high concentration and has high pH value, so that high ammonia volatilization emission is easily generated. Therefore, the method has important significance for reducing the ammonia volatilization emission in the biogas slurry application process through certain technical measures.
Disclosure of Invention
In order to overcome the defects, the invention provides a method for matching biogas slurry and hydrothermal carbon pyrolysis liquid to replace a chemical fertilizer and reduce ammonia volatilization of a rice field.
Hydrothermal carbonization is a thermochemical process that utilizes high temperature (170-. During hydrothermal carbonization, the components of water are changed remarkably, and the high-concentration organic solution (carbon solution) generally contains 20-40% of organic matters and 60-80% of nutrients in the raw materials and has low pH. The carbon liquid may cause environmental risks if it is not properly disposed. And the carbon liquid is returned to the field, so that the recycling of the nutrients contained in the carbon liquid is possible, and the resource treatment is realized. Therefore, the invention enables the carbon liquid to become renewable energy sources, recovers nutrients and nutrients from the hydrothermal carbonization process to the maximum extent, and enables the hydrothermal carbonization process to be economical, environment-friendly and sustainable in development.
The slightly alkaline biogas slurry and the slightly acidic hydrothermal carbon liquid are compounded to realize the blending of acidity and alkalinity, so that the ammonia volatilization loss in the biogas slurry recycling process is expected to be reduced, the resource utilization of the hydrothermal carbon liquid is realized, and the treatment cost is reduced. In the invention, the biogas slurry and the carbon liquid are applied to the soil instead of part of nitrogen fertilizer, and the influence of the biogas slurry and the carbon liquid on the ammonia volatilization of the rice field is inspected through a soil column experiment system in the whole growth period of the rice.
The invention applies biogas slurry and carbon liquid to a rice system instead of partial nitrogen fertilizer, thereby realizing the emission reduction of the emission flux and the accumulated emission of the ammonia volatilization of the rice field. By the method, multiple environmental benefits such as rice field ammonia volatilization emission reduction, agricultural waste recycling and harmlessness can be realized.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a preparation method for applying biogas slurry and hydrothermal carbon pyrolysis liquid in a matched manner to replace chemical fertilizers is characterized by comprising the following steps:
pretreating the biogas residue liquid to obtain biogas slurry;
preparing the treated carbon liquid: mixing straws with water, and carrying out hydrothermal carbonization in a high-pressure reaction kettle, wherein the hydrothermal reaction product comprises solid hydrothermal carbon and a liquid product, the liquid product is hydrothermal carbon pyrolysis liquid, and the hydrothermal carbon pyrolysis liquid is aged to obtain treated carbon liquid; wherein the straw is wheat straw, rice straw or corn straw;
mixing biogas slurry and the treated carbon liquid according to the ratio of 100: 5-30 volume ratio to be used as compound liquid fertilizer.
Specifically, the specific process for pretreating biogas residue liquid to obtain biogas slurry comprises the following steps: and carrying out solid-liquid separation on biogas residue liquid obtained by biogas fermentation to respectively obtain solid and liquid, wherein the liquid is biogas slurry.
By pretreatment of hydrothermal carbon pyrolysis liquid and aging for 10-30d, active free radicals in the pyrolysis liquid are reduced, the active free radicals are decomposed and disappear by self, and possible adverse effects of the free radicals on crops are reduced.
Indexes such as heavy metal content of the prepared biogas slurry carbon liquid compound fertilizer should meet the NY/T2596-.
The preparation method of the hydrothermal carbon pyrolysis liquid comprises the following specific steps: mixing the crushed straws with water, and reacting for 1-2h under the pressure of 2-10MPa and the temperature of 200-270 ℃ to obtain solid hydrothermal carbon and a liquid product, wherein the ratio of the straws to the water is 1:6-12 w/v, and the liquid product is hydrothermal carbon pyrolysis liquid; and standing and aging the hydrothermal carbon pyrolysis liquid for 10-30d to obtain the treated carbon liquid.
Preferably, the specific process of standing and aging the hydrothermal carbon pyrolysis liquid for 10-30d to obtain the treated carbon liquid is as follows: and filtering the hydrothermal carbon pyrolysis liquid, placing the filtered hydrothermal carbon pyrolysis liquid in a sealed container, and standing for 10-30d to obtain the treated carbon liquid. More preferably, the hydrothermal carbon pyrolysis liquid is filtered by a filter screen and then is placed in a sealed container; the container is protected from direct sunlight and is placed in a wide space; standing for 10-30d to obtain treated charcoal liquid, and packaging.
The invention also aims to provide a liquid fertilizer which is prepared by the preparation method and is prepared by the hydrothermal carbon pyrolysis liquid (namely, the biogas liquid and the treated carbon liquid are mixed and prepared) to replace a chemical fertilizer.
It is another object of the present invention to provide the aforementioned method of applying a fertilizer, comprising the steps of: when a base fertilizer, a tillering fertilizer or a spike fertilizer is applied, simultaneously applying biogas slurry and hydrothermal carbon pyrolysis liquid to prepare a substitute fertilizer, wherein the biogas slurry and the hydrothermal carbon pyrolysis liquid are prepared to prepare the substitute fertilizer to substitute 25-75% of nitrogen fertilizer; the biogas slurry and the hydrothermal carbon pyrolysis liquid are applied together to replace chemical fertilizers to be applied to the paddy field soil. Preferably, the biogas slurry and the hydrothermal carbon pyrolysis liquid can be used as a substitute fertilizer to replace 50% of nitrogen fertilizer (such as urea).
The invention also provides a method for applying the alternative fertilizer by matching the biogas slurry and the hydrothermal carbon pyrolysis liquid to reduce ammonia volatilization of the rice field, wherein the alternative fertilizer is applied by matching the biogas slurry and the hydrothermal carbon pyrolysis liquid when the base fertilizer, the tillering fertilizer or the spike fertilizer is applied, and the alternative fertilizer is applied by matching the biogas slurry and the hydrothermal carbon pyrolysis liquid to replace 25-75% of nitrogen fertilizer; the biogas slurry and the hydrothermal carbon pyrolysis liquid are applied together to replace chemical fertilizers to be applied to the paddy field soil.
The invention also provides application of the biogas slurry and hydrothermal carbon pyrolysis liquid in the reduction of ammonia volatilization and emission in the rice field in combination with a chemical fertilizer.
Compared with the prior art, the invention has the beneficial effects that: in the invention, the carbon liquid and the biogas liquid after the treatment replace 50% of nitrogen fertilizer, so that NH is obviously reduced3And (4) volatilizing and accumulating the discharge amount.
Drawings
FIG. 1 shows NH of carbon liquid and biogas slurry in the base fertilizer period after the paddy soil is applied and treated3Flux volatilized, error bars represent SD values between three parallel (n-3);
FIG. 2 application of treated charcoal liquid and biogas slurry to rice field NH3The accumulated emission is volatilized, and the difference between different treatments is obvious (p is less than 0.05) by using English lowercase letters above the rectangular columns;
FIG. 3 shows the field surface water NH in the period of applying biogas slurry and treated carbon liquid base fertilizer4 +-N concentration, error bar indicates SD value between three replicates (N ═ 3);
FIG. 4 shows the NO of the field surface water in the period of applying biogas slurry and treated carbon liquid base fertilizer3 --N concentration, error bar indicates SD value between three replicates (N ═ 3);
FIG. 5. soil urease activity at day four and day ten of the basal fertilization period, with the upper English capital and lower case letters on the histogram representing statistically significant differences between treatments (p < 0.05).
Detailed Description
The following describes embodiments of the present invention with reference to examples.
Biogas slurry material taking and charcoal liquid preparation
The biogas residue liquid selected in the experiment comes from Changzhou, Jiangsu, and the specific process for treating the biogas residue liquid to obtain the biogas slurry is as follows: and (3) performing solid-liquid separation on biogas residue liquid obtained by biogas fermentation to respectively obtain solid and liquid, wherein the liquid is biogas slurry (mixed with the treated carbon liquid for distribution).
The carbon liquid for the experiment is prepared by selecting a hydrothermal carbon liquid-phase product (namely hydrothermal carbon pyrolysis liquid, wherein the hydrothermal carbon liquid-phase product is prepared in a high-temperature hydrothermal reaction kettle, the hydrothermal reaction temperature is 260 ℃, the pressure is 8MPa, the temperature is cooled to room temperature after the reaction is finished, and the liquid-phase product is obtained by filtering) which is prepared by aging. The aging process comprises the following specific steps: filtering the hydrothermal carbon pyrolysis liquid through a filter screen, placing the filtered hydrothermal carbon pyrolysis liquid in a sealed container, and standing for 20d to obtain a treated carbon liquid. The straw is crushed wheat straw (the grain diameter is 1-3mm after crushing), and the ratio of the straw to water is 1: 8w/v (g/mL). The physical and chemical properties of the biogas slurry and the treated carbon are shown in table 1:
TABLE 1 physicochemical Properties of biogas slurry and carbon liquid
Figure RE-GDA0002468826050000041
Soil column experiment of rice
The rice variety selected in the experiment is south peduncle 46 bred by agricultural academy of sciences of Jiangsu province, and the rice variety is widely planted in the south of Sunan of China. Soil used for soil column experiments is 0-20cm of surface soil taken from experimental bases of agricultural academy of sciences of Jiangsu province. The method comprises the following steps of mixing soil uniformly, naturally drying, grinding and sieving the air-dried soil for later use, wherein the basic characteristics of the soil are as follows: pH 6.98 (solid-to-liquid ratio 1: 2.5), organic matter content 0.89%, total nitrogen 0.68g kg-14.71mg kg of available phosphorus-1Quick-acting potassium 147.46mg kg-1， CEC2.53mg kg-1。
This arrangement is fourThe method comprises the following steps: only adding 50% nitrogen in biogas slurry for substitution (T2 treatment), adding 50% nitrogen in biogas slurry for substitution (the volume ratio of biogas slurry to carbon liquid is 9: 1v/v) and adding 50% nitrogen in carbon liquid (namely, adding 10% v/v carbon liquid in the 50% nitrogen in the biogas slurry for substitution, and carrying out T3 treatment), adding 50% nitrogen in the biogas slurry for substitution (namely, adding 20% v/v carbon liquid in the 50% nitrogen in the biogas slurry for substitution, and carrying out T4 treatment), simultaneously setting control treatment (CKU) for applying nitrogen fertilizer but not adding biogas slurry and carbon liquid, wherein the fertilization is the same each time, and each treatment is carried out in three times. The nitrogen fertilizer is applied for three times, namely a Base Fertilizer (BF), a first nitrogen fertilizer application (tillering fertilizer, SF1) and a second nitrogen fertilizer application (spike fertilizer, SF2) at 22 days in 7 months, 13 days in8 months and 26 days in8 months respectively. The three fertilizing amounts are respectively 120kg ha-1N、100kg ha-1N、100kg ha-1N (the fertilizing amount is converted into the nitrogen amount, wherein the nitrogen fertilizer amount applied by the control CKU for three times is 120kgha-1N、100kg ha-1N、100kg ha-1N; the fertilizer amount applied in the three times of the T2, T3 and T4 treatments is 60kgha of nitrogen fertilizer-160kg ha of carbon liquid prepared from N and biogas slurry-150kg ha of N and N fertilizers-1N and biogas slurry are prepared by 50kg ha of carbon liquid-1N and nitrogen fertilizer 50kgha-1N and biogas slurry are prepared by 50kg ha of carbon liquid-1And N, calculating the addition amount of the carbon liquid in the biogas slurry and the carbon liquid in the carbon liquid by converting the addition amount into nitrogen). Wherein the base fertilizer is applied on the day of transplanting. The nitrogenous fertilizer selected in the experiment is urea, and no phosphorus-potassium fertilizer is applied. The experiment selects pot plants with the diameter of 19cm and the effective height of 20cm, and each pot plant is filled with 2.5kg of rice soil. Irrigating with tap water daily, and maintaining the water layer height of the field surface water at 3-5 cm. The experiment is transplanted in 2019, 7 months and 22 days (3 holes and pots)-13 strain, acupoint-1) Harvested in the same year at 11 months and 16 days. Wherein the application time of the biogas slurry and the carbon liquid is consistent with the application time of the nitrogen fertilizer, namely 22 days in 7 months, 13 days in8 months and 26 days in8 months. The carbon liquid (carbon liquid) added in the embodiment of the invention is the treated carbon liquid.
Ammonia volatilization NH of rice field3Volatility measurement
The ammonia volatilization flux is collected and measured by a closed continuous airflow closed-type boric acid absorption method. The ammonia volatilization flux was continuously measured only 10 days after the base fertilizer. Use 0.01M H2SO4Back titrationAbsorption of NH3The boric acid absorbing solution of (1). NH (NH)3The cumulative volatilization volume is the sum of daily emission during observation.
pH, NH of field water4 +-N and NO3 —-N determination
In synchronization with the ammonia volatilization assay, at 15 pm per day: 00 collecting field water to determine pH and NH4 +-N and NO3 --N. The surface water pH was measured in situ using pH3310SET2 (Germany). Field surface water NH4 +-N and NO3 -N in the Netherlands SKALARSAN++SYSTEM flow analyser assay.
Soil urease activity assay
And respectively collecting soil samples in the fourth day and the tenth day after the Base Fertilizer (BF) is applied, naturally drying, and sieving by a 1mm grading sieve. And (3) measuring the soil urease activity by adopting a sodium phenolate-sodium hypochlorite colorimetric method. An air-dried soil sample was weighed into an erlenmeyer flask, and toluene, a 10% urea solution and a citric acid buffer solution (pH 6.7) were added to the flask to incubate for 24 hours at 37 ℃. After the completion of the reaction, the solution was filtered through a filter paper, and 1mL of the solution was put in a 50mL volumetric flask, and 4mL of sodium phenolate and 3mL of sodium hypochlorite were added thereto to fix the volume. The colorimetric determination was carried out in a spectrophotometer at 578nm for 1 h. Soil urease activity was measured as NH in 1g soil4 +-N in mg.
Data processing and analysis
Statistical data analysis was performed using Microsoft Excel2010, analysis of variance was performed using SPSS21.0 statistical software, and analysis of significance of differences was performed using the Duncan test (P < 0.05). The plots were made using origin8.0 and Microsoft Excel2010 software.
Results
NH3Volatile flux
Application of biogas slurry and carbon liquor treated NH3The volatilization flux is shown in FIG. 1. As shown in FIG. 1, NH was present between treatments within 10 days after application of the base fertilizer3The trend of the volatilization is similar: on the first day after fertilization, the ammonia volatilization for the three treatments was higher than that for the control group, 18.80kg of N ha each-1d-1(T3)，16.23kg N ha-1d-1(T2)，7.99kg N ha-1d-1(T4) and then gradually decreases. Control group NH3The peak value of the volatilization flux is 11.16kg N ha-1d-1. Three treatments (T2-T4) of NH 3-10 days after fertilization3The volatile emission is lower than CKU, and 20 percent carbon liquid (T4) is applied to treat NH 2 to 7 days after fertilization3The volatile emission is the lowest. The biogas slurry and the carbon liquid have the abatement function all the time during the base fertilizer application period, but the abatement function is weakened at the later stage.
In addition, the applicant also finds that the ammonia volatilization is high and the yield is low in the treatment of applying the alternative fertilizer (namely, the nitrogen fertilizer is not applied at all and only the biogas slurry and the hydrothermal carbon pyrolysis liquid are applied) by matching the biogas slurry with the hydrothermal carbon pyrolysis liquid for 100 percent of replacing nitrogen. Therefore, the biogas slurry and the hydrothermal carbon pyrolysis liquid are not recommended to be applied together to completely replace the fertilizer.
NH3Cumulative amount of loss due to volatilization
NH after base fertilizer application3The cumulative emission of volatiles and the nitrogen loss rate are shown in FIG. 2. The study showed the average NH of three replicates of T1, T2, T3, T4 treatment3The cumulative emission of volatilization was 58.34kg of N ha-1d-1、50.31kg N ha-1d-1、54.82kg N ha-1d-1、42.52kg N ha-1d-1Accounts for 35.44-48.62% of the total amount of the base fertilizer, and NH is reduced by the treatment of T2, T3 and T4 compared with the CKU of a control group3The volatile emission is respectively reduced by 13.8 percent (T2), 6.0 percent (T3) and 27.1 percent (T4), and the ammonia volatile emission is obviously reduced by only 20 percent of carbon liquid treatment (T4) (P is less than 0.05) in biogas slurry distribution, so that the emission reduction effect is the best.
Specific yield
And analyzing the yield of the kernels treated by applying the carbon liquid and the biogas liquid. Yield of control group 26.37g pot-1The biogas slurry and the carbon liquid are applied for treatment at the temperature of 20.02-27.71g pot-1And no significant difference from the control group. The stable yield of the rice can be realized by reasonably distributing the biogas slurry and the carbon liquid.
pH of field water
The pH of the field water in the base fertilizer period (1-10 days after the base fertilizer is applied) is shown in Table 2. Ammonia volatilization emission is directly affected by the pH of the paddy field water. The results show that, during the base fertilizer period,the pH value of the land water treated by 20 percent carbon liquid (T4) which is mixed with the biogas slurry is 0.18 unit lower than that of CKU, and NH3The emission reduction results of the volatile accumulated emission are consistent.
TABLE 2 pH of paddy field waters at different treatment base fertilizer periods
Figure RE-GDA0002468826050000061
Figure RE-GDA0002468826050000071
Note: different lower case letters indicate significant differences between treatments during fertile periods (p < 0.05)
Field surface water NH4 +-N and NO3 -Concentration of-N
FIGS. 3 and 4 show surface water NH4 +-N and NO3 --dynamic variation of N concentration. 1-2 days after fertilization, all the treated field water NH4 +the-N content is higher than CKU, and the results are the same as the results of ammonia volatilization. Applying biogas slurry and carbon liquid to NH4 +-N and NO3 —The effect of the occurrence of the peak N concentration is insignificant.
All treatment of surface water NO3 -The N concentration content reaches a peak value at 2 days of the base fertilizer. Biogas slurry is mixed with 10% carbon liquid (T3) to treat surface water NO3 -The lowest N concentration, 10 percent carbon liquid treatment and 20 percent carbon liquid treatment of biogas slurry are applied to the field water NO3 --N concentrations are generally lower than CKU.
Soil urease activity
FIG. 5 shows the urease activity of the Base Fertilizer (BF) in different treatments and different periods, and it can be seen from FIG. 5 that there is no significant difference (p > 0.05) between the urease activities in different treatments and different periods. On the fourth day of fertilization, urease activities of the biogas slurry and the carbon liquid applied for treatment are both higher than CKU, but urease activity of the carbon liquid applied for treatment is lower than CKU on the tenth day. The carbon liquid has the function of reducing the activity of urease, and has positive significance for reducing the ammonium concentration of the surface water and further reducing the volatilization and emission of ammonia.
The ammonia volatilization of the rice field is free NH in the water of the field surface4 +N to gaseous NH3And the process of volatilizing into the air and NH in the field water4 +The N concentration and the pH are closely related. The detection result of the invention on the pH of the field surface water shows that the pH of the field surface water is lower than that of CKU treatment in different degrees after the Base Fertilizer (BF) is treated by applying the biogas slurry and the carbon liquid for 1 to 7 days, and NH treated by applying the carbon liquid and the biogas slurry in the Base Fertilizer (BF) period3The cumulative amount of volatile emissions is also lower than for CKU treatment. Second, NH in the field water4 +The N concentration also affects the emission of ammonia volatilization. The invention shows that the NH is treated by applying biogas slurry and carbon liquid 1-2 days after the base fertilizer4 +N concentration higher than CKU, and treating NH by applying biogas slurry and carbon liquid3The volatile content is higher than CKU, the results of the volatile content and the CKU are consistent, and NH is treated in each later period4 +The N concentration tends to be uniform. But the pH value of the carbon liquid is lower, and the lower pH value of the field surface water can inhibit the volatilization of ammonia during the 3 th to 5 th days of the base fertilizer.
In addition, soil urease activity also affects the surface water NH4 +The important factor of N concentration, soil urease, can promote the hydrolysis of urea in soil, and convert urea into inorganic ammonia and carbonic acid. And (3) adding a urease inhibitor, regulating and controlling nitrogen supply of a farmland, wherein the urease activity is lower than CKU in the tenth day of treatment by applying the carbon liquid and the biogas liquid, the ammonia volatilization amount is lower than CKU in the later period of treatment by applying the biogas liquid and the carbon liquid, and the results of the urease inhibitor and the carbon liquid are consistent.
In the invention, the carbon liquid and the biogas liquid after the treatment replace 50% of nitrogen fertilizer, so that NH is obviously reduced3The cumulative emission of volatile matter was reduced by 13.8% (T2), 6.0% (T3) and 27.1% (T4) respectively compared to CKU. The treatment of applying biogas slurry and carbon liquid has a great influence on the pH of the water in the early field. But to surface water NH4 +the-N concentration and the soil urease activity had no significant effect. Compared with the treatment of independently applying biogas slurry, the treatment of the biogas slurry with 20% carbon liquid has lower pH, thereby obviously reducing the cumulative emission of ammonia volatilization. This is related to the lower pH of the carbon liquor and also to the humic and fatty acids contained in the liquor itself.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims (9)

1. A preparation method for applying biogas slurry and hydrothermal carbon pyrolysis liquid in a matched manner to replace chemical fertilizers is characterized by comprising the following steps:
pretreating the biogas residue liquid to obtain biogas slurry;
preparing the treated carbon liquid: mixing straws with water, and carrying out hydrothermal carbonization in a high-pressure reaction kettle, wherein the hydrothermal reaction product comprises solid hydrothermal carbon and a liquid product, the liquid product is hydrothermal carbon pyrolysis liquid, and the hydrothermal carbon pyrolysis liquid is aged to obtain treated carbon liquid; wherein the straw is wheat straw, rice straw or corn straw;
mixing biogas slurry and the treated carbon liquid according to the ratio of 100: 5-30 volume ratio to be used as compound fertilizer.
2. The method for preparing the biogas slurry and hydrothermal carbon pyrolysis liquid as claimed in claim 1, wherein the biogas residue liquid is pretreated to obtain the biogas slurry by the specific steps of: and carrying out solid-liquid separation on biogas residue liquid obtained by biogas fermentation to respectively obtain solid and liquid, wherein the liquid is biogas slurry.
3. The method for preparing the biogas slurry and the hydrothermal carbon pyrolysis liquid as the substitute fertilizer as claimed in claim 1, wherein the hydrothermal carbon pyrolysis liquid is prepared by the following specific steps: mixing the crushed straws with water, and reacting for 1-2h under the pressure of 2-10MPa and the temperature of 200-270 ℃ to obtain solid hydrothermal carbon and a liquid product, wherein the ratio of the straws to the water is 1:6-12 w/v, and the liquid product is hydrothermal carbon pyrolysis liquid; and standing and aging the hydrothermal carbon pyrolysis liquid for 10-30d to obtain the treated carbon liquid.
4. The method for preparing the biogas slurry and the hydrothermal carbon pyrolysis liquid as the substitute fertilizer as claimed in claim 3, wherein the specific process of standing and aging the hydrothermal carbon pyrolysis liquid for 10-30d to obtain the treated carbon liquid comprises the following steps: and filtering the hydrothermal carbon pyrolysis liquid, placing the filtered hydrothermal carbon pyrolysis liquid in a sealed container, and standing for 10-30d to obtain the treated carbon liquid.
5. The biogas slurry prepared by the preparation method of claims 1-4 is mixed with hydrothermal carbon pyrolysis liquid to be applied to replace chemical fertilizers.
6. The alternative fertilizer matched with biogas slurry and hydrothermal carbon pyrolysis liquid as claimed in claim 5, which is a liquid fertilizer.
7. The application method of the biogas slurry and hydrothermal carbon pyrolysis liquid for applying the alternative fertilizer in a matching manner is characterized by comprising the following steps of: when a base fertilizer, a tillering fertilizer or a spike fertilizer is applied, simultaneously applying biogas slurry and hydrothermal carbon pyrolysis liquid to prepare a substitute fertilizer, wherein the biogas slurry and the hydrothermal carbon pyrolysis liquid are prepared to prepare the substitute fertilizer to substitute 25-75% of nitrogen fertilizer; the biogas slurry and the hydrothermal carbon pyrolysis liquid are applied together to replace chemical fertilizers to be applied to the paddy field soil.
8. The use of biogas slurry and hydrothermal carbon pyrolysis liquid as defined in claim 5 in combination with a substitute fertilizer for reducing ammonia volatilization and emission in rice fields.
9. A method for using biogas slurry and hydrothermal carbon pyrolysis liquid to prepare a substitute fertilizer to reduce ammonia volatilization in a rice field is characterized in that the biogas slurry and the hydrothermal carbon pyrolysis liquid are simultaneously used to prepare the substitute fertilizer when a base fertilizer, a tillering fertilizer or a spike fertilizer is applied, and the biogas slurry and the hydrothermal carbon pyrolysis liquid are used to prepare the substitute fertilizer to substitute 25-75% of nitrogen fertilizer; the biogas slurry and the hydrothermal carbon pyrolysis liquid are applied together to replace chemical fertilizers to be applied to the paddy field soil.
CN202010106232.0A 2020-02-21 2020-02-21 Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field Active CN111233576B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010106232.0A CN111233576B (en) 2020-02-21 2020-02-21 Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010106232.0A CN111233576B (en) 2020-02-21 2020-02-21 Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field

Publications (2)

Publication Number Publication Date
CN111233576A true CN111233576A (en) 2020-06-05
CN111233576B CN111233576B (en) 2022-07-19

Family

ID=70862567

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010106232.0A Active CN111233576B (en) 2020-02-21 2020-02-21 Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field

Country Status (1)

Country Link
CN (1) CN111233576B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112142512A (en) * 2020-09-23 2020-12-29 山东奥淼科技发展有限公司 Method for preparing organic controlled-release biochar-based fertilizer by using biological semicoke
CN112142531A (en) * 2020-06-19 2020-12-29 中国科学院生态环境研究中心 Novel process for preparing novel liquid organic fertilizer from waste biomass
CN116143555A (en) * 2022-12-29 2023-05-23 黑龙江世纪云天化农业科技有限公司 Liquid fertilizer and preparation method and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104186225A (en) * 2014-08-28 2014-12-10 湖南城头山农林开发有限公司 Method for promoting high yield of mao bamboo forest
CN105265190A (en) * 2015-11-16 2016-01-27 刘自忠 Method for performing grafting and drip irrigation on wild black fruit Chinese wolfberry
CN105622275A (en) * 2016-03-14 2016-06-01 朱青春 Pure-natural multi-effect biogas slurry compound fertilizer and production method
CN106590717A (en) * 2016-12-14 2017-04-26 上海理工大学 Method for hydrothermally preparing wood vinegar from biomass

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104186225A (en) * 2014-08-28 2014-12-10 湖南城头山农林开发有限公司 Method for promoting high yield of mao bamboo forest
CN105265190A (en) * 2015-11-16 2016-01-27 刘自忠 Method for performing grafting and drip irrigation on wild black fruit Chinese wolfberry
CN105622275A (en) * 2016-03-14 2016-06-01 朱青春 Pure-natural multi-effect biogas slurry compound fertilizer and production method
CN106590717A (en) * 2016-12-14 2017-04-26 上海理工大学 Method for hydrothermally preparing wood vinegar from biomass

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
童文彬等: "沼液浓缩液与粗木醋液农田混合施用的应用前景及潜在环境效应探讨", 《浙江农业科学》 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112142531A (en) * 2020-06-19 2020-12-29 中国科学院生态环境研究中心 Novel process for preparing novel liquid organic fertilizer from waste biomass
CN112142512A (en) * 2020-09-23 2020-12-29 山东奥淼科技发展有限公司 Method for preparing organic controlled-release biochar-based fertilizer by using biological semicoke
CN116143555A (en) * 2022-12-29 2023-05-23 黑龙江世纪云天化农业科技有限公司 Liquid fertilizer and preparation method and application thereof
CN116143555B (en) * 2022-12-29 2023-08-04 黑龙江世纪云天化农业科技有限公司 Liquid fertilizer and preparation method and application thereof

Also Published As

Publication number Publication date
CN111233576B (en) 2022-07-19

Similar Documents

Publication Publication Date Title
Zhang et al. Influence of bulking agents on physical, chemical, and microbiological properties during the two-stage composting of green waste
Zhang et al. Mitigation of carbon and nitrogen losses during pig manure composting: A meta-analysis
CN102503661B (en) Soil amendment prepared from biogas residue and wormcast as main material and preparation method thereof
CN111233576B (en) Method for applying biogas slurry and hydrothermal carbon pyrolysis liquid to replace chemical fertilizer and reduce ammonia volatilization of rice field
Jin et al. Valorization of bio-fertilizer from anaerobic digestate through ammonia stripping process: A practical and sustainable approach towards circular economy
WO2021179506A1 (en) Method for collaboratively improving acid soil by charcoal and biogas
CN1291949C (en) Salt-resistant multielement drip irrigation fertilizer and its preparation method
CN1128121C (en) Method for decomposing stalks and straws of crops and fertilizer made of them
CN1793082A (en) Straw biological organic manure and production process thereof
CN104446916A (en) Special matrix for watermelon seedling culture
Losak et al. Digestate from biogas plants is an attractive alternative to mineral fertilisation of kohlrabi
AU2020103729A4 (en) Method for Restoring Acidified and Degraded Soil of Economic Forest
CN108623344A (en) A kind of organic fertilizer and its preparation method and application
Luo et al. Nitrogen removal from digested piggery wastewater using fermented superphosphate within the pretreatment stage and an MAP fertilizer pot test
Feng et al. The inhibiting effects of biochar-derived organic materials on rice production
CN106699464B (en) Bio-organic fertilizer containing magnesium-method desulfurization slag and preparation method thereof
Bian et al. Biochar-enhanced agricultural application of liquid digestate from food waste anaerobic digestion for celery cultivation
Li et al. Effects of different fermentation synergistic chemical treatments on the performance of wheat straw as a nursery substrate
CN101274861B (en) Heavy metal-passivated organic fertilizer and composting method
Roslan et al. Study on the characteristics and utilization of sewage sludge at Indah Water Konsortium (IWK) Sungai Udang, Melaka
Sharma et al. Integrated nutrient management: A long-term approach towards sustainability
CN105016857A (en) Biochar slow-release base fertilizer special for sweet potatoes and preparation method thereof
Kocar The use of anaerobically digested slurry combined with natural zeolite for rapeseed production
CN106631350A (en) Preparation method of straw organic liquid specially used for crops
CN113173827A (en) Pigeon manure source carbon-based organic-inorganic compound fertilizer and preparation method and application thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant