CN107021580B - Method for recycling waste liquid generated after extracting tigogenin from sisal hemp - Google Patents

Method for recycling waste liquid generated after extracting tigogenin from sisal hemp Download PDF

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CN107021580B
CN107021580B CN201710285154.3A CN201710285154A CN107021580B CN 107021580 B CN107021580 B CN 107021580B CN 201710285154 A CN201710285154 A CN 201710285154A CN 107021580 B CN107021580 B CN 107021580B
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waste liquid
tigogenin
exchange resin
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CN107021580A (en
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卢易达
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Wenling Qiliang Shoes Co.,Ltd.
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    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/001Processes for the treatment of water whereby the filtration technique is of importance
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/28Treatment of water, waste water, or sewage by sorption
    • C02F1/283Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/42Treatment of water, waste water, or sewage by ion-exchange
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/78Treatment of water, waste water, or sewage by oxidation with ozone
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/101Sulfur compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/12Halogens or halogen-containing compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/30Organic compounds
    • C02F2101/34Organic compounds containing oxygen

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  • Environmental & Geological Engineering (AREA)
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  • Treatment Of Water By Ion Exchange (AREA)
  • Removal Of Specific Substances (AREA)
  • Water Treatment By Sorption (AREA)

Abstract

The invention discloses a method for recycling waste liquid after extracting tigogenin from sisal, belonging to the technical field of sewage treatment in saponin industry. The method of the invention decomposes and filters harmful substances by combining chemical reaction and physical filtration, and realizes the purpose that precipitates, waste gas and waste liquid can be recycled. Compared with the traditional neutralization method and the microbiological method for treating the waste liquid generated in the production process of the tigogenin, the method has the characteristics of simple process, low cost, waste material recycling and no secondary pollution.

Description

Method for recycling waste liquid generated after extracting tigogenin from sisal hemp
Technical Field
The invention belongs to the technical field of saponin industrial sewage treatment, and particularly relates to a method for recycling waste liquid after extracting tigogenin from sisal.
Background
Tigogenin, english name: tigogenin, chinese alias: sisal sapogenin, also known as tikeginine, etc., is a basic raw material for synthesizing steroid hormone medicines, and the hormone is called 'medical gold' and 'mother of hormone'. Extracting tigogenin from sisal hemp, squeezing the sisal hemp residue after removing fiber, hydrolyzing sisal hemp juice with acid at a certain temperature and pressure, mixing the hydrolysate obtained after hydrolysis with lime, drying, extracting with ethanol under reflux, acidifying and decolorizing the extract, concentrating and crystallizing to obtain crude tigogenin, and recrystallizing the crude tigogenin to obtain the product. The downstream product monoene produced by utilizing the tigogenin can synthesize more than 120 hormone drugs such as betamethasone and the like. Tigogenin is also widely applied to industries such as food, cosmetics, animal husbandry and the like, is the most common and main basic raw material in the field of biological medicine and chemical industry, and belongs to a new medicine engineering technology which is supported and encouraged by the state.
However, during the extraction process of tigogenin, a large amount of waste water which is difficult to treat is generated, and the water resource protection is seriously threatened. The saponin production wastewater belongs to acid-containing high-concentration organic wastewater, and the following problems are generally existed: high COD concentration, high sugar content, high salt content, high acidity, high chloride ion content, high sulfate ion content, high chroma pollution and the like. If the wastewater in the sisal hemp saponin production process is not properly treated, the wastewater can bring serious pollution to the surrounding environment. Because tigogenin production enterprises are mostly distributed in remote areas close to raw material production places and water sources and far away from urban drainage pipe networks, if the tigogenin is directly discharged to water bodies without any treatment, the tigogenin can seriously pollute downstream rivers. A large amount of algae, sulfate reducing bacteria and the like are propagated, a large amount of stimulating gases such as SO2, H2S and the like are generated, dissolved oxygen in a water body is consumed, and the ecological environment of a river is changed; in addition, the discharge of a large amount of acidic substances in the wastewater can change the properties of surrounding water and soil, influence the growth of crops, destroy ecological balance and seriously influence the life of downstream residents.
At present, the waste liquid generated in the sisal hemp saponin industry in China is mainly treated in a harmless way by a neutralization method and a microbial decomposition method, and the effect is not satisfactory and is not enough. For example, Chinese patent "a method for treating industrial wastewater in the production process of tigogenin" (application No. CN201410260014.7, application date: 2014.06.12) discloses a method for treating industrial wastewater in the production process of tigogenin, which comprises the following steps: feeding the wastewater in the sisal hemp saponin production process into an alkali pretreatment tank, adjusting the pH value to an alkaline range, filtering, and separating into filter residue and filtrate sewage; mixing the filtrate and the sewage with domestic sewage, sending the mixture into a neutralization blending tank, measuring the COD content, adding N, P components according to the COD content, carrying out aeration stirring for more than 10 minutes, sending the mixture into a primary sedimentation tank for primary sedimentation, then sending the mixture into a biochemical tank for biochemical reaction, sending the sewage after the biochemical reaction into a secondary sedimentation tank for secondary sedimentation, separating supernatant liquid for discharge after the detection reaches the standard, and sending sludge at the bottom of the tank back to the biochemical tank for recycling. The strain added into the biochemical tank is a mixture of more than two of gram-negative bacillus-free, nitrobacteria, denitrifying bacteria, phosphorus-accumulating bacteria, filamentous bacteria and facultative heterotrophic bacteria, and the wastewater after the bacteria biochemical treatment enters a secondary sedimentation tank for sedimentation and is discharged after being detected to be qualified. Although the discharged wastewater meets the discharge standard of the emission standard of pollutants for water in saponin industry (GB 20425-2006), the residual amount of bacterial colonies in the water body is large, and the balance of a microbial ecosystem of the water body is easily destroyed after the discharged wastewater is discharged, so that the living environment of animals and plants is influenced.
Disclosure of Invention
The present invention aims to provide a method for recycling waste liquid after extracting tigogenin from sisal hemp, aiming at the defects of the prior art. According to the method for recycling the waste liquid after extracting the tigogenin from the sisal, the harmful substances are decomposed and filtered in a mode of combining chemical reaction and physical filtration, and the purpose that precipitates, waste gas and waste liquid can be recycled is achieved. Compared with the traditional neutralization method and the microbiological method for treating the waste liquid generated in the production process of the tigogenin, the method has the characteristics of simple process, low cost, waste material recycling and no secondary pollution.
In order to solve the technical problems, the invention adopts the technical scheme that:
a method for recycling waste liquid after extracting tigogenin from sisal hemp comprises the following steps:
a. measuring the ion content of sulfate radical, oxalate radical and chloride ion in the waste liquid;
b. adding phosphate rock powder into the waste liquid, wherein the equivalent ratio of the added phosphate rock powder to sulfate radical is 1 (1-3.5), uniformly stirring, wherein the phosphate rock powder and the sulfate radical react to generate calcium superphosphate crystals and calcium sulfate and release hydrogen fluoride gas, the hydrogen fluoride gas reacts with silicon dioxide and silicate in the phosphate rock powder to generate silicon tetrafluoride, collecting escaping gas and introducing the escaping gas into a water washing tower to obtain a fluosilicic acid solution, the calcium sulfate reacts with oxalic acid in the waste liquid to generate calcium oxalate precipitates and sulfuric acid, the sulfuric acid circularly reacts with the phosphate rock powder, standing for 2-5d for solidification, and passing through a 200-mesh and 300-mesh screen to obtain precipitates;
c. adding anion exchange resin into the waste liquid filtered in the step b, wherein the equivalent ratio of the added anion exchange resin to chloride ion is (1-3):1, stirring for 1-1.5h, passing through a 100-mesh 200-mesh screen, and filtering out the anion exchange resin;
d. c, introducing ozone into the waste liquid filtered in the step c, stirring, and standing for 3-5 hours;
e. and d, filtering the waste liquid after standing in the step d by using activated carbon, and obtaining the dischargeable waste liquid meeting the comprehensive sewage discharge standard after the detection is qualified. And if the detection is not qualified, returning to the step a to restart the processing.
Further, the granularity of the powdered rock phosphate in the step b is 100-200 meshes, and the grade of the powdered rock phosphate is more than 31 percent of P2O5
Further, the mass fraction of the solute of the fluorosilicic acid solution obtained in the step b is 25-30%.
Preferably, for better removal of chloride ions from the waste liquid, the anion exchange resin in step c is a strongly basic anion exchange resin, and the anion exchange resin is pre-expanded by soaking in 15% saline before use.
Further, the ratio of the volume of the ozone introduced into the waste liquid in the step d to the volume of the waste liquid is (1-3): 1.
preferably, in order to make the pH value more alkaline, lime powder is added before the activated carbon is used for filtering in the step e, the mixture is stirred uniformly, the pH value is adjusted to 7.5-8.0, the mixture is kept still for 1-2d and is filtered by a 200-mesh and 300-mesh screen, and the filtered supernatant is filtered by the activated carbon.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. according to the method for recycling the waste liquid after extracting the tigogenin from the sisal, the concept of recycling the waste liquid is adopted, and the acid and the salt in the waste liquid are effectively separated through the reaction with the ground phosphate rock, the anion exchange resin, the ozone and the lime powder, so that the pH value and the chromaticity of water quality are improved, and the dissolved oxygen amount of a water body is increased. Finally, the contents of suspended substances, metal ions and chromaticity in the waste liquid are reduced again through the adsorption of the active carbon, and the dischargeable waste liquid meeting the discharge standard of the saponin industrial water pollutants is obtained. Wherein the ground phosphate rock reacts with sulfuric acid in the waste liquid to generate superphosphate and hydrogen fluoride gas which can be prepared into phosphate fertilizer, the hydrogen fluoride gas reacts with silicon dioxide and silicate in the ground phosphate rock to generate silicon tetrafluoride, and the silicon tetrafluoride is hydrolyzed by a water washing tower to obtain recyclable fluosilicic acid with solute mass fraction of 25-30%. Oxalic acid existing in the water body indirectly reacts with calcium sulfate, and recyclable calcium oxalate is separated out, so that the total recycling rate of sulfuric acid and oxalic acid in the waste liquid is up to 97%. The rest of the phosphate rock powder and the calcium sulfate can be filtered out by a screen, so that the added phosphate rock powder has no secondary pollution; the anion exchange resin can effectively remove residual sulfate ions, nitrate ions, chloride ions, carbonate ions and the like in the waste liquid, the contents of acid and salt in the water body are obviously reduced, and the anion exchange resin can be recycled without secondary pollution; ozone is introduced into the waste liquid and continuously stirred, so that not only can sterilization, decoloration and deodorization be realized, but also the oxygen content and the PH value of the water body can be improved; the lime powder is added, so that not only can organic matters in the water body be precipitated and bubbles on the water surface be reduced, but also the PH value of the waste liquid can be adjusted and controlled; finally, the invention uses the active carbon to filter the waste liquid, can further reduce the metal ions in the water body, and can also play roles of filtering, decoloring and the like. Although the waste liquid treated by the method meets the discharge standard of saponin industrial water pollutants (GB 20425-2006), the waste liquid retains higher sugar content and can realize higher value when being used as irrigation water of crops, so that the practically dischargeable waste water is relatively less, and the discharged waste liquid can play a role in increasing the weight of aquatic plants. After precipitation, waste gas recovery, acid-base regulation, filtration and purification by the method, the method realizes that precipitates, waste gas and waste liquid can be recycled, and has the effects of saving energy, reducing emission, changing waste into valuable and harmless purification.
2. According to the method for recycling the waste liquid after extracting the tigogenin from the sisal, the harmful substances are decomposed and filtered in a mode of combining chemical reaction and physical filtration, and the purpose that precipitates, waste gas and waste liquid can be recycled is achieved. Compared with the traditional neutralization method and the microbiological method for treating the waste liquid generated in the production process of the tigogenin, the method has the characteristics of simple process, low cost, waste material recycling and no secondary pollution.
Detailed Description
A method for recycling waste liquid after extracting tigogenin from sisal hemp is characterized by comprising the following steps:
a. measuring the ion content of sulfate radical, oxalate radical and chloride ion in the waste liquid;
b. adding phosphate rock powder into the waste liquid, wherein the equivalent ratio of the added phosphate rock powder to sulfate radical is 1 (1-3.5), uniformly stirring, wherein phosphate rock and sulfate radical react to generate calcium superphosphate crystals and calcium sulfate and release hydrogen fluoride gas, the hydrogen fluoride gas reacts with silicon dioxide and silicate in the phosphate rock powder to generate silicon tetrafluoride, collecting escaping gas and introducing the escaping gas into a water washing tower to obtain a fluosilicic acid solution, the calcium sulfate reacts with oxalic acid in the waste liquid to generate calcium oxalate precipitates and sulfuric acid, the sulfuric acid circularly reacts with the phosphate rock powder, standing for 2-5d for solidification, and passing through a 200-mesh and 300-mesh screen to obtain precipitates;
c. adding anion exchange resin into the waste liquid filtered in the step b, wherein the equivalent ratio of the added anion exchange resin to chloride ion is (1-3):1, stirring for 1-1.5h, passing through a 100-mesh 200-mesh screen, and filtering out the anion exchange resin;
d. c, introducing ozone into the waste liquid filtered in the step c, stirring, and standing for 3-5 hours;
e. and d, filtering the waste liquid after standing in the step d by using activated carbon, and obtaining the dischargeable waste liquid meeting the comprehensive sewage discharge standard after the detection is qualified. And if the detection is not qualified, returning to the step a to restart the processing.
In order to improve the utilization rate of the powdered rock phosphate and shorten the reaction time, the particle size of the powdered rock phosphate in the step b is 100-200 meshes, and the taste of the powdered rock phosphate is 31 percent P2O5
In order to facilitate storage and transportation of the fluorosilicic acid solution, the mass fraction of the solute of the fluorosilicic acid solution obtained in the step b is 25-30%.
In order to increase the exchange efficiency of the anions, the anion exchange resin in step c is a strongly basic anion exchange resin.
In order to improve the decoloring, deodorizing and sterilizing capability, the ratio of the volume of the ozone introduced into the waste liquid in the step d to the volume of the waste liquid is (1-3): 1.
in order to increase the pH value of the wastewater, adding lime powder before filtering with active carbon in the step e, uniformly stirring, adjusting the pH value to 7.5-8.0, standing and precipitating for 1-2d, sieving with a 200-mesh and 300-mesh sieve, and filtering the filtered supernatant with active carbon.
Example 1
The method for recycling the waste liquid after extracting the tigogenin from the sisal hemp is characterized by comprising the following steps:
a. measuring the ion content of sulfate radical, oxalate radical and chloride ion in the waste liquid;
b. adding phosphate rock powder with the granularity of 200 meshes into the waste liquid, wherein the grade of the phosphate rock powder is 31 percent of P2O5The equivalent ratio of the added phosphate rock powder to the sulfate radical is 1:1, and the mixture is stirred uniformly, wherein the phosphate rock powder and the sulfate radicalReacting to generate calcium superphosphate crystals and calcium sulfate and releasing hydrogen fluoride gas, reacting the hydrogen fluoride gas with silicon dioxide and silicate in the powdered rock phosphate to generate silicon tetrafluoride, collecting the escaping gas and introducing the gas into a water washing tower to obtain a fluosilicic acid solution with the solute mass fraction of 25%, reacting the calcium sulfate with oxalic acid in waste liquid to generate calcium oxalate precipitates and sulfuric acid, circularly reacting the sulfuric acid with the powdered rock phosphate, standing for 5 days for solidification, and sieving with a 200-mesh sieve to obtain precipitates;
c. adding anion exchange resin into the waste liquid filtered in the step b, wherein the equivalent ratio of the added anion exchange resin to chloride ions is 3:1, stirring for 1h, sieving by a 200-mesh sieve, and filtering out the anion exchange resin;
d. and c, introducing ozone into the waste liquid filtered in the step c and stirring, wherein the ratio of the volume of the ozone introduced into the waste liquid to the volume of the waste liquid is 3:1, standing for 3 hours;
e. and d, filtering the waste liquid after standing in the step d by using activated carbon, and detecting to be qualified to obtain the dischargeable waste liquid meeting the comprehensive sewage discharge standard.
Example 2
The method for recycling the waste liquid after extracting the tigogenin from the sisal hemp is characterized by comprising the following steps:
a. measuring the ion content of sulfate radical, oxalate radical and chloride ion in the waste liquid;
b. adding phosphate rock powder with the granularity of 100 meshes into the waste liquid, wherein the grade of the phosphate rock powder is 33 percent of P2O5Adding phosphate rock powder and sulfate radical with the equivalent ratio of 1:3.5, uniformly stirring, wherein the phosphate rock powder and the sulfate radical react to generate calcium superphosphate crystals and calcium sulfate and release hydrogen fluoride gas, the hydrogen fluoride gas reacts with silicon dioxide and silicate in the phosphate rock powder to generate silicon tetrafluoride, collecting escaping gas and introducing the gas into a water washing tower to obtain a fluorosilicic acid solution with the solute mass fraction of 30%, the calcium sulfate reacts with oxalic acid in waste liquid to generate calcium oxalate precipitates and sulfuric acid, the sulfuric acid circularly reacts with the phosphate rock powder, standing for 2d for curing, and screening by a 300-mesh screen to obtain precipitates;
c. b, adding strong-base anion exchange resin into the waste liquid filtered in the step b, wherein the equivalent ratio of the added strong-base anion exchange resin to chloride ions is 1:1, stirring for 1.5h, sieving by using a 100-mesh sieve, and filtering out the strong-base anion exchange resin;
d. and c, introducing ozone into the waste liquid filtered in the step c and stirring, wherein the ratio of the volume of the ozone introduced into the waste liquid to the volume of the waste liquid is 1:1, standing for 5 hours;
e. and d, adding lime powder into the waste liquid after standing in the step d, uniformly stirring, adjusting the pH value to 8.0, standing and precipitating for 2d, sieving by using a 200-mesh sieve, filtering the filtered supernatant by using active carbon, and detecting to be qualified to obtain the dischargeable waste liquid meeting the comprehensive sewage discharge standard.
Example 3
The method for recycling the waste liquid after extracting the tigogenin from the sisal hemp is characterized by comprising the following steps:
a. measuring the ion content of sulfate radical, oxalate radical and chloride ion in the waste liquid;
b. adding powdered rock phosphate with the granularity of 150 meshes into the waste liquid, wherein the taste of the powdered rock phosphate is 35 percent of P2O5Adding phosphate rock powder and sulfate radical with the equivalent ratio of 1:2, uniformly stirring, wherein the phosphate rock powder and the sulfate radical react to generate calcium superphosphate crystals and calcium sulfate and release hydrogen fluoride gas, the hydrogen fluoride gas reacts with silicon dioxide and silicate in the phosphate rock powder to generate silicon tetrafluoride, collecting escaping gas and introducing the escaping gas into a water washing tower to obtain a fluosilicic acid solution with the solute mass fraction of 25%, the calcium sulfate reacts with oxalic acid in waste liquid to generate calcium oxalate precipitates and sulfuric acid, the sulfuric acid circularly reacts with the phosphate rock powder, standing for 4d for solidification, and screening through a 260-mesh screen to obtain precipitates;
c. b, adding strong-base anion exchange resin into the waste liquid filtered in the step b, wherein the equivalent ratio of the added strong-base anion exchange resin to chloride ions is 2:1, stirring for 1.5h, sieving by a 150-mesh sieve, and filtering out the strong-base anion exchange resin;
d. and c, introducing ozone into the waste liquid filtered in the step c and stirring, wherein the ratio of the volume of the ozone introduced into the waste liquid to the volume of the waste liquid is 2:1, standing for 4 hours;
e. and d, adding lime powder into the waste liquid after standing in the step d, uniformly stirring, adjusting the pH value to 7.5, standing and precipitating for 1d, sieving by using a 300-mesh sieve, filtering the filtered supernatant by using active carbon, and detecting to be qualified to obtain the dischargeable waste liquid meeting the comprehensive sewage discharge standard.
Test data
The waste liquid after extracting tigogenin from sisal is treated according to the methods of the 3 examples. The waste liquid used in the method is collected into 400L after being uniformly stirred in a collecting pool of the waste liquid generated in a sisal saponin production line of a certain company of Guangxi Nanning, and the collected waste liquid is divided into four parts (a control group, an example group 1, an example group 2 and an example group 3), wherein the example groups are purified by the methods of the example group 3. The test results were shown in the following table, using the test method required in the emission Standard of contaminants of Saponin Industrial Water (GB 20425-2006):
Figure DEST_PATH_IMAGE001
as can be seen from the above table, the waste liquid treated by the method of the embodiment of the invention completely meets the sewage discharge requirement of the industry, and the method for recycling the waste liquid after extracting the tigogenin from the sisal hemp has obvious effect. The wastewater of 3 example groups can be directly used for plant irrigation, and the actual water discharge amount is about 35% of the total sewage amount after the test of the company for several months, so the water discharge amount of the example groups is recorded as 35 in the table.

Claims (3)

1. A method for recycling waste liquid after extracting tigogenin from sisal hemp is characterized by comprising the following steps:
a. measuring the ion content of sulfate radical, oxalate radical and chloride ion in the waste liquid;
b. adding phosphate rock powder into the waste liquid, wherein the equivalent ratio of the added phosphate rock powder to sulfate radical is 1 (1-3.5), uniformly stirring, wherein the phosphate rock powder and the sulfate radical react to generate calcium superphosphate crystals and calcium sulfate and generate hydrogen fluoride gas, the hydrogen fluoride gas reacts with silicon dioxide and silicate in the phosphate rock powder to generate silicon tetrafluoride, collecting escaping gas and introducing the escaping gas into a water washing tower to obtain a fluosilicic acid solution, the calcium sulfate reacts with oxalic acid in the waste liquid to generate calcium oxalate precipitates and sulfuric acid, the sulfuric acid circularly reacts with the phosphate rock powder, standing for 2-5d for solidification, and passing through a 200-mesh and 300-mesh screen to obtain precipitates;
c. adding anion exchange resin into the waste liquid filtered in the step b, wherein the equivalent ratio of the added anion exchange resin to chloride ion is (1-3):1, stirring for 1-1.5h, passing through a 100-mesh 200-mesh screen, and filtering out the anion exchange resin;
d. c, introducing ozone into the waste liquid filtered in the step c, stirring, and standing for 3-5 hours;
e. d, filtering the waste liquid after standing in the step d by using activated carbon, and obtaining dischargeable waste liquid meeting the discharge standard of the saponin industrial water pollutants after the detection is qualified;
the granularity of the powdered rock phosphate in the step b is 100-200 meshes, and the grade of the powdered rock phosphate is more than 31 percent of P2O5
The mass fraction of the solute of the fluorosilicic acid solution obtained in the step b is 25-30%;
the anion exchange resin in the above step c is a strongly basic anion exchange resin.
2. The method for recycling the waste liquid after extracting the tigogenin from the sisal hemp according to claim 1, wherein the ratio of the volume of the ozone introduced into the waste liquid in the step d to the volume of the waste liquid is (1-3): 1.
3. the method as claimed in claim 1, wherein the lime powder is added before the activated carbon is used for filtration in step e, the mixture is stirred uniformly, the pH value is adjusted to 7.5-8.0, the mixture is left for 1-2 days for precipitation, the obtained product is screened by a 200-mesh and 300-mesh screen, and the obtained supernatant is filtered by the activated carbon.
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CN1488581A (en) * 2003-08-14 2004-04-14 华中师范大学 Yellow giner saponin industrial sewage treating method and comprehensive utilization
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CN1814546A (en) * 2006-03-03 2006-08-09 倪文斌 Method for producing general superphosphate from waste water of yellow ginger processing by dry method
CN101134625A (en) * 2006-03-03 2008-03-05 倪文斌 Method for wastewater comprehensive utilization of saponin production

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