CN106631279B - Method for preparing sulfur-containing liquid fertilizer by using barium sulfate factory wastewater - Google Patents
Method for preparing sulfur-containing liquid fertilizer by using barium sulfate factory wastewater Download PDFInfo
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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
- C05D9/02—Other inorganic fertilisers containing trace elements
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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
- C05F11/00—Other organic 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
- C05F11/00—Other organic fertilisers
- C05F11/08—Organic fertilisers containing added bacterial cultures, mycelia or the like
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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
Abstract
The invention relates to the technical field of liquid fertilizers, in particular to a method for preparing a liquid fertilizer by utilizing barium sulfate factory wastewater. The liquid fertilizer disclosed by the invention is small in elemental sulfur granularity and rich in various microbial active ingredients, and can be used for improving sulfur-poor soil, promoting the growth of crops and improving the quality of the crops.
Description
Technical Field
The invention relates to the field of liquid fertilizers. In particular to a method for preparing liquid fertilizer by utilizing waste water of barium sulfate factories.
Background
Sulfur (S) is one of essential main nutrient elements for plants, can directly provide nutrition for crops, and can also improve the utilization rate of nitrogen and phosphorus of the crops, thereby increasing the yield of the crops. As agricultural productivity increases, the demand of crops for all nutrient elements also increases. Particularly, after the fertilization levels of nitrogen, phosphorus and potassium are increased to meet the high-yield requirement of crops, sulfur becomes the fourth main nutrient element of the crops. The sulfur dioxide is always the main source of sulfur required by the growth of crops for many years, and the sulfur which can be provided for the crops is less and less as the discharge amount of the sulfur dioxide is reduced year by year, and the trend is increasingly severe along with the enhancement of the environmental pollution treatment. Moreover, the increase of the application amount of the high-concentration fertilizer and the reduction of the organic matter level of the soil, and the reduction of the sulfur content in the soil become more and more important factors for restricting the improvement of the crop yield.
Currently, sulfur is added into a fertilizer product in the sulfur fertilizer, and a sulfur-reinforced base fertilizer is used as a source for sulfur supplement. For example, a biological sulfur fertilizer with the patent number of CN201310552734.6 and a preparation method thereof, the H in the biogas is extracted by using microorganisms such as thiobacillus ferrooxidans and the like2The suspension liquid of sulfur-containing simple substance generated after S is converted into simple substance sulfur can make the simple substance sulfur in good suspension state under higher concentration, and can prevent the microorganism in the suspension liquid from making the product green and smelly, thereby increasing the yield of crops and greatly preventing and treating diseasesThe fertilizer is an ideal elemental sulfur fertilizer, and realizes comprehensive treatment and utilization of wastewater. Also, as in CN201180051872.5, a method of making a fertilizer composition containing micronized sulphur, comprises dissolving elemental sulphur in anhydrous or aqueous ammonia to form an ammonia/sulphur solution, and reacting the ammonia/sulphur solution with an acidic component having at least one plant growth constituent to simultaneously form a sulphur composition comprising a sulphur compound and micronized sulphur. The fertilizer composition thus formed is dried and may be shaped into various shapes such as pellets, beads, etc. In the common sulfur fertilizer preparation process, the sulfur source is less, the cost is high, and the sulfur fertilizer has low organic content and is lack of active substances.
On the other hand, in the current barium sulfate industry, barium sulfate has the advantages of strong chemical inertia, good stability, acid and alkali resistance, capability of absorbing harmful rays and the like, is widely used for various coatings and is used in a large amount in many fields. The enormous market demand increases the production of barium sulfate, which is BaS + Na in the production process2SO4＝BaSO4+Na2S, product Na in the reaction2The concentration of S is 4% -6%, and the factory is used for producing sodium sulfide products by evaporation crystallization. In addition, the concentration of the dilute sodium sulfide waste liquid generated in the process of cleaning the barium sulfate product is 1-2.5%, and if an evaporative crystallization method is used, the energy consumption is too large, so that the method is not economical and practical. There is currently no suitable treatment, essentially to discharge as waste. Thus wasting resources and polluting environment. If the wastewater rich in the sulfur element is converted into the sulfur fertilizer required by the needed crops, not only the pollution source is treated, but also considerable economic value is brought.
However, in the treatment of wastewater from barium sulfate plants in the prior art, the product value is low, for example, a process and a device for recovering sodium sulfide wastewater from barium sulfate production with patent number CN201210509879.3, the steps are as follows: adding sulfuric acid into dilute sodium sulfide waste liquid for neutralization; absorbing hydrogen sulfide by using a sodium sulfide spray tower; adding hydrogen peroxide into the sodium sulfate solution to oxidize the hydrogen sulfide dissolved in the sodium sulfate solution into sulfur; filtering the sodium sulfate solution; finally, the dilute solution of sodium sulfate is led to a disc tube type reverse osmosis membrane system or a high-pressure flat plate membrane systemThe concentrated solution is recycled in the production of barium sulfate, and the clear solution can be directly discharged, thereby achieving the effect of changing waste into valuable. The process adopts various reagents and is complex to operate. Another example is CN200810048341.0, the method for treating the waste water from barium sulfate production includes such steps as introducing the acidic waste water to a reactor, adding appropriate sodium hydroxide solution, and neutralizing reaction (NaOH + H)2SO4＝Na2SO4+H2O, the products are sodium sulfate and water; then, carrying out precipitation in a precipitation tank, separating out impurities, entering a clear liquid tank, and pumping into a saltpeter melting process by using a water pump for reuse. The invention adopts the sodium hydroxide solution to neutralize the acid pickling wastewater and leads the acid pickling wastewater to the nitrate dissolving process for recycling, thereby not only realizing the zero discharge of the acid wastewater and avoiding the environmental pollution, but also realizing the recycling of the acid pickling wastewater. Wherein sulfuric acid is introduced, only the pH is adjusted, and sodium sulfide in the effluent is not treated. And the product obtained by the commonly used wastewater treatment process has low purity and small application range, and cannot have larger additional value.
It can be seen that the prior art is relatively poor in research on the production of high-quality sulfur-containing liquid fertilizer from wastewater containing high-concentration sodium sulfide in barium sulfate plants. Through years of research of the inventor, a process for preparing the sulfur-containing liquid fertilizer from the high-concentration sodium sulfide wastewater of a barium sulfate plant is successfully designed according to the conversion mechanism of pollutants.
Disclosure of Invention
In order to solve the technical problem, the invention provides a method for preparing a liquid fertilizer by using barium sulfate factory wastewater, which comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the sodium sulfide-containing wastewater to 0.9-1.3g/L solution at 30-35 ℃, adding 1.31-1.52g of sodium acetate, 0.68-0.81g of sodium carbonate, 4.1-4.9g of ammonium chloride, 0.3-0.6g of magnesium sulfate, 0.1-0.23g of calcium chloride, 0.3-0.42g of potassium chloride, 10-20g of sodium chloride, 15-30g of sodium sulfate and V into each liter of waste liquidB1215-26ug of trace elements and 0.8-2ml of trace elements are prepared into inoculation liquid, and the pH value is adjusted to 7-9;
(2) inoculating purple sulfur bacteria: the inoculation amount is 1-1.5% of the mass of the wastewater, the culture condition is illumination of 1000-;
(3) centrifugal separation: separating the fermentation liquor obtained in the step (2) for 15-30min by a high-speed centrifuge of 5000-;
(4) liquid cell disruption: heating the temperature of the purple sulfur bacteria fermentation liquid in the step (3) to 40-45 ℃, culturing for 12 hours to form polysulfide granules in bacteria, adding 1-2% of nostoc polysaccharide extract, pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electric power ultrasonic emitter to 4-7 MHz, the pulse cycle frequency to 8-12 times/second, generating a sound beam of 1500-220 MPa/second and a liquid interface sound pressure value to 10-50 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to 150-220 Pa and the temperature to 40-45 ℃, performing ultrasonic extraction for 180-45 min, crushing purple sulfur bacteria cells in the fermentation liquid under the action of ultrasonic waves, releasing sulfur granules and active ingredients in the cells, and forming uniform mixed liquid to obtain the liquid fertilizer.
The invention has the beneficial effects that:
sodium sulfide in the barium sulfate wastewater is oxidized by purple sulfur bacteria to form intracellular sulfur granules, and then centrifugal separation is carried out to concentrate cell sap and improve the concentration of the sulfur granules. Then adding nostoc extract, breaking cells by ultrasonic waves to release sulfur and other active ingredients, and keeping sulfur granules not to precipitate at a higher concentration by utilizing the kinematic viscosity of the nostoc extract, so that the obtained liquid fertilizer has high sulfur content, small sulfur granularity and easy absorption, and is rich in vitamins, active proteins and coenzyme Q, and can effectively promote the growth of plants. In addition, the sulfur fertilizer has the advantages of wide source of sulfur raw materials, low energy consumption and low cost, and can treat wastewater polluting the environment, thereby achieving multiple purposes and being popularized in the production of the sulfur fertilizer.
Detailed Description
The technical solution of the present invention is further defined below with reference to the specific embodiments, but the scope of the claims is not limited to the description.
Example 1
A method for preparing liquid fertilizer by utilizing wastewater of a barium sulfate factory comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the waste water containing sodium sulfide to 1.2g/L solution at 33 deg.C, adding sodium acetate 1.32g, sodium carbonate 0.71g, ammonium chloride 4.8g, magnesium sulfate 0.5g, calcium chloride 0.19g, potassium chloride 0.39g, sodium chloride 18g, sodium sulfate 28g, and V into each liter of waste liquidB1218ug, 1ml of trace elements, and adjusting the pH value to 8;
(2) inoculating purple sulfur bacteria: the inoculation amount is 1-1.5% of the mass of the wastewater, the culture condition is 2000Lux, the temperature is 33 ℃, the anaerobic fermentation is carried out under illumination, and the standing fermentation is carried out for 5 days;
(3) centrifugal separation: separating the fermentation liquor obtained in the step (2) for 20min by a 6000r/min high-speed centrifuge, wherein the concentration of sodium sulfide in the waste liquor is diluted, the photosynthetic product of purple sulfur bacteria only accounts for a small part of the waste liquor, after centrifugation, collecting crude liquor containing cell sediment at the lower layer and supernatant, heating and fermenting for a period of time according to the mass ratio of 1:1, and returning the residual supernatant to the step (1) to prepare the fermentation liquor again;
(4) cell disruption: heating the purple sulfur bacteria fermentation liquid of the step (3) to 40-45 ℃, culturing for 12 hours to form polysulfide granules in bacteria, adding 2% of nostoc polysaccharide extract, pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electrodynamic force ultrasonic transmitter to be 6 megahertz, the pulse cycle frequency to be 11 times/second, sound beams to be 1800 m/second and the liquid interface sound pressure value to be 40 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to be 180Pa, the temperature to be 43 ℃, performing ultrasonic extraction for 200min, breaking purple sulfur bacteria cells in the fermentation liquid under the action of ultrasonic waves, releasing sulfur granules and active ingredients in cells, and forming uniform mixed liquid to obtain the liquid fertilizer.
Example 2
A method for preparing liquid fertilizer by utilizing wastewater of a barium sulfate factory comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the sodium sulfide-containing wastewater to 1.3g/L solution at 35 DEG CThe liquid is prepared by adding 1.52g of sodium acetate, 0.81g of sodium carbonate, 4.9g of ammonium chloride, 0.6g of magnesium sulfate, 0.23g of calcium chloride, 0.42g of potassium chloride, 20g of sodium chloride, 30g of sodium sulfate and V into each liter of waste liquidB1226ug of trace elements (2 ml) to prepare inoculation liquid, and adjusting the pH value to 9;
(2) inoculating purple sulfur bacteria: the inoculation amount is 1.5 percent of the mass of the wastewater, the culture condition is 3000Lux,35 ℃, the illumination is carried out for anaerobic treatment, and the standing fermentation is carried out for 7 days;
(3) centrifugal separation: separating the fermentation liquor obtained in the step (2) for 30min by a high-speed centrifuge at 8000r/min, wherein the concentration of sodium sulfide in the waste liquor is diluted, the photosynthetic product of purple sulfur bacteria only accounts for a small part of the waste liquor, centrifuging, collecting crude liquor containing cell sediment at the lower layer and supernatant, heating and fermenting for a period of time according to the mass ratio of 1:1, and returning the residual supernatant to the step (1) to prepare the fermentation liquor again;
(4) cell disruption: heating the purple sulfur bacteria fermentation liquid of the step (3) to 45 ℃, culturing for 12 hours to form polysulfide granules in bacteria, adding 2% of nostoc polysaccharide extract, pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electrodynamic force ultrasonic emitter to be 7 megahertz, the pulse cycle frequency to be 12 times/second, sound beam to be 2000 m/second, liquid interface sound pressure value to be 50 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to be 220Pa, the temperature to be 45 ℃, extracting for 240 minutes by ultrasonic waves, breaking the purple sulfur bacteria cells in the fermentation liquid under the action of the ultrasonic waves, releasing sulfur granules and active ingredients in the cells to form uniform mixed liquid, and obtaining the liquid fertilizer.
Example 3
A method for preparing liquid fertilizer by utilizing wastewater of a barium sulfate factory comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the waste water containing sodium sulfide to 0.9g/L solution at 30 deg.C, adding sodium acetate 1.31g, sodium carbonate 0.68g, ammonium chloride 4.1g, magnesium sulfate 0.3g, calcium chloride 0.1g, potassium chloride 0.3g, sodium chloride 10g, sodium sulfate 15g, and V into each liter of waste liquidB1215ug, 0.8ml of trace elements, preparing inoculation liquid, and adjusting the pH to 7;
(2) inoculating purple sulfur bacteria: the inoculation amount is 1 percent of the mass of the wastewater, the culture condition is 1000Lux, the temperature is 30 ℃, the illumination is used for anaerobic treatment, and the standing fermentation is carried out for 5 days;
(3) centrifugal separation: separating the fermentation liquor obtained in the step (2) for 15min by a high-speed centrifugal machine of 5000r/min, wherein the photosynthetic product of purple sulfur bacteria only accounts for a small part of the waste liquor due to the diluted sodium sulfide concentration in the waste liquor, after centrifugation, collecting crude liquor containing cell sediment at the lower layer and supernatant, heating and fermenting for a period of time according to the mass ratio of 1:1, and returning the residual supernatant to the step (1) to prepare the fermentation liquor again;
(4) liquid cell disruption: heating the purple sulfur bacteria fermentation liquid of the step (3) to 40 ℃, culturing for 12 hours to form polysulfide granules in bacteria, adding 1% of nostoc polysaccharide extract, pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electrodynamic force ultrasonic emitter to be 4 MHz, the pulse cycle frequency to be 8 times/second, a sound beam to be 1500 m/second and a liquid interface sound pressure value to be 10 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to be 150Pa, the temperature to be 40 ℃, extracting for 180min by ultrasonic, breaking the purple sulfur bacteria cells in the fermentation liquid under the action of the ultrasonic, releasing the sulfur granules and active ingredients in the cells to form uniform mixed liquid, and thus obtaining the liquid fertilizer.
Example 4
A method for preparing liquid fertilizer by utilizing wastewater of a barium sulfate factory comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the waste water containing sodium sulfide to 1.1g/L solution at 30 deg.C, adding sodium acetate 1.32g, sodium carbonate 0.81g, ammonium chloride 4.1g, magnesium sulfate 0.5g, calcium chloride 0.19g, potassium chloride 0.4g, sodium chloride 18g, sodium sulfate 28g, and V into each liter of waste liquidB1218ug, 1ml of trace elements, and adjusting the pH value to 7;
(2) inoculating purple sulfur bacteria: the inoculation amount is 1-1.5% of the mass of the wastewater, the culture condition is 2000Lux, the temperature is 33 ℃, the anaerobic fermentation is carried out under illumination, and the standing fermentation is carried out for 5 days;
(3) centrifugal separation: separating the fermentation liquor obtained in the step (2) for 20min by a 7000r/min high-speed centrifuge, wherein the concentration of sodium sulfide in the waste liquor is diluted, the photosynthetic product of purple sulfur bacteria only accounts for a small part of the waste liquor, after centrifugation, collecting crude liquor containing cell sediment at the lower layer and supernatant, heating and fermenting for a period of time according to the mass ratio of 1:1, and returning the residual supernatant to the step (1) to prepare the fermentation liquor again;
(4) liquid cell disruption: heating the purple sulfur bacteria fermentation liquid of the step (3) to 40-45 ℃, culturing for 12 hours to form polysulfide granules in bacteria, adding 2% of nostoc polysaccharide extract, pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electrodynamic force ultrasonic transmitter to be 6 megahertz, the pulse cycle frequency to be 11 times/second, sound beams to be 1800 m/second and the liquid interface sound pressure value to be 40 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to be 180Pa, the temperature to be 43 ℃, performing ultrasonic extraction for 200min, breaking purple sulfur bacteria cells in the fermentation liquid under the action of ultrasonic waves, releasing sulfur granules and active ingredients in cells, and forming uniform mixed liquid to obtain the liquid fertilizer.
Example 5
A method for preparing liquid fertilizer by utilizing wastewater of a barium sulfate factory comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the waste water containing sodium sulfide to 1.3g/L solution at 32 deg.C, adding sodium acetate 1.4g, sodium carbonate 0.7g, ammonium chloride 4.9g, magnesium sulfate 0.6g, calcium chloride 0.23g, potassium chloride 0.3g, sodium chloride 10g, sodium sulfate 30g, and V into each liter of waste liquidB1226ug of trace elements (2 ml) to prepare inoculation liquid, and adjusting the pH value to 8;
(2) inoculating purple sulfur bacteria: the inoculation amount is 1.5 percent of the mass of the wastewater, the culture condition is 2000Lux,31 ℃, the illumination is carried out for anaerobic treatment, and the standing fermentation is carried out for 7 days;
(3) centrifugal separation: separating the fermentation liquor obtained in the step (2) for 30min by a high-speed centrifuge at 8000r/min, wherein the concentration of sodium sulfide in the waste liquor is diluted, the photosynthetic product of purple sulfur bacteria only accounts for a small part of the waste liquor, centrifuging, collecting crude liquor containing cell sediment at the lower layer and supernatant, heating and fermenting for a period of time according to the mass ratio of 1:1, and returning the residual supernatant to the step (1) to prepare the fermentation liquor again;
(4) cell disruption: heating the purple sulfur bacteria fermentation liquid of the step (3) to 45 ℃, culturing for 12 hours to form polysulfide granules in bacteria, adding 2% of nostoc polysaccharide extract, pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electrodynamic force ultrasonic emitter to be 7 megahertz, the pulse cycle frequency to be 12 times/second, a sound beam to be 1700 m/second and a liquid interface sound pressure value to be 50 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to be 220Pa, the temperature to be 45 ℃, extracting for 240 minutes by ultrasonic waves, breaking the purple sulfur bacteria cells in the fermentation liquid under the action of the ultrasonic waves, releasing the sulfur granules and active ingredients in the cells to form uniform mixed liquid, and thus obtaining the liquid fertilizer.
Example 6
A method for preparing liquid fertilizer by utilizing wastewater of a barium sulfate factory comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the wastewater containing sodium sulfide to 1.3g/L at 35 deg.C, adding sodium acetate 1.5g, sodium carbonate 0.68g, ammonium chloride 4.6g, magnesium sulfate 0.3g, calcium chloride 0.1g, potassium chloride 0.4g, sodium chloride 10g, sodium sulfate 15g, and V into each liter of the waste liquidB1222ug and 0.8ml of trace elements are prepared into inoculation liquid, and the pH is adjusted to 7;
(2) inoculating purple sulfur bacteria: the inoculation amount is 1 percent of the mass of the wastewater, the culture condition is 1000Lux, the temperature is 30 ℃, the illumination is used for anaerobic treatment, and the standing fermentation is carried out for 7 days;
(3) centrifugal separation: separating the fermentation liquor obtained in the step (2) for 15min by a high-speed centrifugal machine of 5000r/min, wherein the photosynthetic product of purple sulfur bacteria only accounts for a small part of the waste liquor due to the diluted sodium sulfide concentration in the waste liquor, after centrifugation, collecting crude liquor containing cell sediment at the lower layer and supernatant, heating and fermenting for a period of time according to the mass ratio of 1:1, and returning the residual supernatant to the step (1) to prepare the fermentation liquor again;
(4) cell disruption: heating the purple sulfur bacteria fermentation liquid of the step (3) to 40 ℃, culturing for 12 hours to form polysulfide granules in bacteria, adding 1% of nostoc polysaccharide extract, pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electrodynamic force ultrasonic emitter to be 4 MHz, the pulse cycle frequency to be 8 times/second, a sound beam to be 1500 m/second and a liquid interface sound pressure value to be 10 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to be 150Pa, the temperature to be 40 ℃, extracting for 180min by ultrasonic, breaking the purple sulfur bacteria cells in the fermentation liquid under the action of the ultrasonic, releasing the sulfur granules and active ingredients in the cells to form uniform mixed liquid, and thus obtaining the liquid fertilizer.
Test examples the effect of the sulphur fertilizer of the invention on the growth of maize
The influence of the fertilizer on the growth of the corn is tested in a corn planting base in big county in Bijie city, the total area of the test is 2 mu, wherein 1 mu is a test group, the sulfur fertilizer is applied, and the other mu is a control group. Adding farmyard manure and nitrogen, phosphorus and potassium fertilizers into two groups according to the conventional method, additionally applying the sulfur fertilizer of the invention by using 500 times of liquid of the liquid fertilizer in a test group at a seedling stage, irrigating the sulfur fertilizer with 220 kg/mu of liquid, spraying 800 times of liquid of the liquid fertilizer on leaf surfaces every ten days at the beginning of a jointing stage, additionally applying the sulfur fertilizer in a control group at the seedling stage, spraying the same amount of clear water in the jointing stage, observing and recording the color of leaves, measuring the plant height (randomly selecting 50 plants to obtain the average value) and measuring the yield.
The leaf color and plant height test results are shown in the table
The test result shows that in the early growth stage of corn, the influence of the corn growth is mainly on the leaf color, the corn leaves using the liquid fertilizer are greener, and the advantage of the corn plant height using the liquid fertilizer in the later growth stage is gradually reflected.
Effect of Using the products of the invention on corn yield
Test results show that the yield of the corn is increased by 17.15% after the liquid fertilizer is used.
Influence of the liquid fertilizer on the quality of corn kernels
As can be seen from the table, after the liquid fertilizer disclosed by the invention is used, the weight of the corn grains is increased by 11.55%, the protein content is increased by 11.1%, the fat content is increased by 4.8%, and the starch content is 8.3%.
It should be noted that the above embodiments are only for further illustration and description of the technical solution of the present invention, and are not for further limitation of the technical solution of the present invention.
Claims (1)
1. A method for preparing a corn liquid fertilizer by using barium sulfate factory wastewater comprises the following steps:
(1) pretreatment of barium sulfate wastewater: diluting the waste water containing sodium sulfide into waste liquid, adding 1.31-1.52g of sodium acetate, 0.68-0.81g of sodium carbonate, 4.1-4.9g of ammonium chloride, 0.3-0.6g of magnesium sulfate, 0.1-0.23g of calcium chloride, 0.3-0.42g of potassium chloride, 10-20g of sodium chloride, 15-30g of sodium sulfate and V into each liter of waste liquidB1215-26ug of trace elements and 0.8-2ml of trace elements are prepared into inoculation liquid, and the pH value is adjusted;
(2) inoculating purple sulfur bacteria to perform illumination anaerobic fermentation;
(3) centrifugal separation: separating the fermentation liquid obtained in the step (2) for 15-30min by a high-speed centrifuge with the speed of 5000-;
(4) cell disruption: adding nostoc polysaccharide extract into the fermentation product obtained in the step (3), pumping into a vacuum ultrasonic reaction kettle, adjusting the frequency of an electrodynamic force ultrasonic transmitter to be 4-7 megahertz, the pulse period frequency to be 8-12 times/second, the sound beam 1500-2000 m/second, the liquid interface sound pressure value to be 10-50 degrees, enabling the fermentation liquid fluid to generate vortex, controlling the vacuum degree to be 150-220 Pa and the temperature to be 40-45 ℃;
the dilution concentration of the sodium sulfide wastewater in the step (1) is 0.9-1.3 g/L;
the pH value in the step (1) is 7-9;
the inoculation amount of the purple sulfur bacteria in the step (2) is 1-1.5%;
the illumination anaerobic fermentation in the step (2) is carried out for 5-7 days at the temperature of 1000-3000Lux and 30-35 ℃;
the preparation ratio of the supernatant and the crude liquid containing cell sediment in the lower layer in the step (3) is 1:1 by mass;
the temperature-rising fermentation in the step (3) is carried out for 12 hours at the temperature of 40-45 ℃;
the adding amount of the nostoc polysaccharide extract in the step (4) is 1-2%;
the liquid fertilizer is used in combination with common fertilizers.
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