CN107445391B - Method for repairing amino acid fermentation wastewater by using biochemical technology - Google Patents
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- C02F1/28—Treatment of water, waste water, or sewage by sorption
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Abstract
The invention relates to a method for restoring amino acid fermentation wastewater by using a biochemical technology, which is characterized by comprising the following steps of: amino acid industrial wastewater flows through multiple grids, the grid gaps of the multiple grids are gradually reduced, then the wastewater is discharged into a sedimentation tank, then an adsorbent is added, the adsorbent is added into the wastewater according to the addition amount of 0.3kg per ton of wastewater, sedimentation treatment is carried out, and then hydrolytic acidification anaerobic biochemical treatment-bioremediation treatment is carried out. The application can improve the treated water quantity and the treated water quality, reduce the operating cost and promote the discharge after reaching the standard. The yield of sludge can be reduced, COD, ammonia nitrogen and other pollutants in the waste liquid can be removed, and the application prospect is good.
Description
Technical Field
The invention relates to the field of amino acid extraction processes in the biological fermentation industry, and particularly discloses a method for repairing amino acid fermentation wastewater by using a biochemical technology.
Background
In the production of amino acid, a large amount of fermentation waste liquid is discharged from a factory, which causes serious pollution to the environment. The CO D concentration of the fermentation waste liquid is high, generally more than tens of thousands mg/L, although the COD concentration of the mixed waste water is about ten thousands mg/L after various waste water in a factory is diluted, the treatment technology of the high-concentration organic industrial waste water is always a research hotspot and difficulty, a large amount of thalli contained in the waste water are reported to be extracted, the thalli are single-cell protein and contain rich protein, and the analysis of the chemical components of the dried thalli protein shows that the content of the protein in the glutamic acid waste thalli is up to 85.8 percent, the total amino acid content is 78.77 percent, and the content is higher than that of raw materials such as soybean meal, yeast and the like which are commonly used for protein zymolyte at present. The amino acid variety and the proportion are complete, and the nutrient solution is rich in vitamins, nucleic acid, polysaccharide and other nutrient substances. And in addition, in the glutamic acid fermentation process, the added saccharide substances and the glutamic acid are fermented together to generate isomaltooligosaccharide. The high-concentration wastewater generated by glutamic acid fermentation is filtered by an ultrafiltration membrane and then is desalted by bipolar membrane electrodialysis, the desalted wastewater can be used for preparing fertilizer, and the obtained desalted clear liquid contains a large amount of isomaltooligosaccharide. These useful substances are discharged in vain, and cause a great amount of loss and waste every year.
In recent years, the construction and development of the amino acid production industry in China are fast, and the method becomes a hot spot of investment of foreign materials and the economic growth of China, so that environmental problems such as water resource pollution and the like become keys for restricting the sustainable development of the amino acid production industry. The amino acid wastewater is harmful, nontoxic and high-concentration organic acid wastewater, the standard discharge is difficult by using a single treatment method, and the clean production can be realized only by a route combining comprehensive utilization and treatment.
The Fufeng group is a leading enterprise for producing amino acids such as glutamic acid, xanthan gum and the like and derivative products globally, and the yield of the glutamic acid and the xanthan gum is the first global. The main sources of the amino acid fermentation sewage are as follows: waste mother liquor or ion exchange tail liquor after glutamic acid is extracted from fermentation liquor; washing wastewater of various devices (a pulp mixing tank, a liquefaction tank, a saccharification tank, a fermentation tank, an extraction tank, a neutralization and decoloration tank and the like) in the production process; washing and regenerating wastewater by using ion exchange resin; cooling water for each stage of liquefaction (95 ℃) to saccharification, saccharification to fermentation and the like; various condensed water (liquefaction, saccharification, concentration, etc.);
the characteristics and the main problems of the water quality of the production wastewater of part of domestic manufacturers
On one hand: the extraction of the glutamic acid usually adopts an isoelectric-ion exchange method, the isoelectric point is adjusted by adding concentrated sulfuric acid to crystallize the glutamic acid, and the ammonium sulfate waste liquid generated in the production process brings difficulty to the waste liquid treatment and causes direct harm to the environment and water sources.
On the other hand: the monosodium glutamate industry is also the largest pollution source in the fermentation industry of China, and according to statistics, each ton of monosodium glutamate products generates about 15 tons of high-concentration wastewater. The high-concentration organic wastewater in the monosodium glutamate industry is seriously polluted and is an outstanding common problem in the industry. The fermentation waste mother liquor or ion exchange tail liquor is a main pollution source in the monosodium glutamate production industry.
And finally: adsorption processes rely primarily on the large specific surface area of the adsorbent to remove contaminants from water by physical or chemical adsorption. The activated carbon has a rich pore structure and a huge specific surface area, has good chemical stability and strong adsorption capacity, is widely used as an important adsorbent material, but has high cost. And non-metal ion minerals such as attapulgite are used for adsorption, but natural non-metal minerals as adsorbents have the following limitations: the natural non-metal mineral has larger density and limited specific surface area, the surface of the natural non-metal mineral is negatively charged, and natural non-metal powder ore such as clay mineral is directly used as an adsorbent, so that the problem that solid and liquid are difficult to separate after adsorption exists.
At present, relevant scientific research institutes and amino acid production enterprises in China do a lot of work around the treatment process and comprehensive utilization of amino acid wastewater, a plurality of new treatment processes and resource utilization schemes are provided, and the treatment of the amino acid wastewater gradually tends to the combination of the new treatment process and the full-flow resource utilization. The applicant group company is dedicated to a method for producing clean amino acid in official customs for many years, and has disclosed a process for effectively treating fermentation waste liquid, wherein a microbial agent is used, the effect of treating COD, ammonia nitrogen and SS is good, but the variety of strains in the microbial agent is too many, the possibility of strain pollution is increased, the using amount of the microbial agent is large, 0.5-1kg of physical adsorbent and 15-20g of microbial agent are required to be added to each ton of sewage, and the microbial agent is easy to deposit on the bottom of a pool to cause flocculation, so that a large amount of sludge is generated, and the cleaning is difficult.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for restoring amino acid fermentation wastewater by using a biochemical technology, has simple and convenient production process operation, meets the requirements of comprehensive utilization of resources, energy conservation and emission reduction, reduces the discharge of waste liquid, lightens the burden of sewage treatment, and brings huge economic benefits and environmental protection benefits. In order to realize the purpose of the invention, the following technical scheme is adopted:
a method for restoring amino acid fermentation wastewater by using a biochemical technology is characterized by comprising the following steps:
A. natural sedimentation
Flowing the glutamic acid fermentation industrial wastewater through a multiple grid, gradually reducing grid gaps of the multiple grid, discharging into a sedimentation tank, adding an adsorbent, adding the adsorbent into the wastewater according to the addition amount of 0.3kg per ton of wastewater, blowing air in, and performing sedimentation treatment to obtain the supernatant of the industrial wastewater;
the adsorbent is as follows: mixing the shell powder, granite and polymerized ferric sulfate according to the mass ratio of 5:4: 1;
B. hydrolytic acidification anaerobic biochemical treatment
Discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, adjusting the pH to 3-7, and then discharging into a hydrolysis acidification tank for hydrolysis acidification anaerobic biochemical treatment to obtain hydrolysis acidified industrial wastewater;
C. bioremediation process
Discharging the hydrolyzed and acidified industrial wastewater in the step B into a sedimentation tank, adjusting the pH value to 6.5-7.0, adding a bioremediation agent for advanced treatment, adding 2-3 g of the bioremediation agent into each cubic meter of liquid every time, adding 1 time every day, continuously adding for 5-7 days, standing for 3 days, and finally filtering and discharging through a plate and frame filter; the plate frame filter is used for collecting microbial thalli, and avoids polluting a water body. Thus obtaining the discharge water meeting the environmental protection standard.
The bioremediation preparation is prepared by mixing a compound microbial agent and a carrier according to the weight ratio of 3-2:2-1, wherein the active ingredients of the compound microbial agent comprise the following raw materials in parts by weight:
4 parts of rhodococcus fermentation liquor, 5 parts of bacillus pumilus fermentation liquor, 2 parts of penicillium heterobiotic fermentation liquor and 3 parts of micrococcus luteus fermentation liquor.
The Rhodococcus is Rhodococcus (Rhodococcus rhodochrous） ATCC 15906；
The Bacillus pumilus is Bacillus pumilus (Bacillus pumnlis) CCTCC NO. M2014225;
the Penicillium heterobiotic is Penicillium heterobiotic (Penicillium divarsum) ATCC 10437;
said Micrococcus luteus (Micrococcus luteus) is ATCC 49442.
The concentration of Rhodococcus, Bacillus pumilus, Penicillium xenobiotum and Micrococcus luteus is controlled at 1 × 108Mixing the cultured bacteria liquid according to the mass ratio to obtain the compound microbial agent;
the preparation method of the carrier comprises the following steps:
putting zeolite and kaolinite into a pulverizer according to the mass ratio of 2:1 for pulverizing, and then grinding into powder of 100 meshes; putting the powder, starch and chitosan into a stirrer according to the mass ratio of 2:2:1, stirring at 1000rpm for 10min to obtain a mixed material, adding the mixed material and polystyrene microspheres into a granulator according to the mass ratio of 1:1, and then adding a polyvinyl alcohol aqueous solution with the concentration of 6wt% accounting for 30% of the mass of the polystyrene microspheres to prepare particles with the particle size of 1-2 mm; drying the particles in an oven at 80 deg.C for 30min, sintering in a sintering furnace at 700 deg.C for 20min, taking out, and naturally cooling to room temperature.
Adding 2-3 g of bioremediation agent into each cubic meter of liquid every time, adding for 1 time every day, continuously adding for 5-7 days, standing for 3 days, and finally filtering and discharging through a plate-and-frame filter; the plate frame filter is used for collecting microbial thalli, and avoids polluting a water body. Thus obtaining the discharge water meeting the environmental protection standard.
The invention has the following beneficial effects:
the adsorbent 1 is prepared by mixing shell powder, granite and polymerized ferric sulfate according to the mass ratio of 5:4:1, contains a certain natural material taking silicate as a main body, contains organic matters and mineral substances, contains trace elements in the natural material taking silicate as the main body, can be separated out in sewage along with the passage of time, and enables soluble pollutants in the sewage to generate chemical reaction under the action of dissolved oxygen and acid radical ions to generate solidified bodies so as to purify water. The polyferric sulfate can enable organic matters in the sewage to accelerate the agglutination and conversion of pollutants by playing the characteristics of net trapping, bridging and the like, so that micro particles and pollutants in the water body are coagulated into floccules.
2 in order to reduce the dependence to single specific microbial inoculum, avoid the loss caused by microbial inoculum pollution, the applicant has developed various microbial preparations, which complement each other to ensure the normal operation of sewage treatment, the composite microbial inoculum of the application is specially used for the wastewater in the glutamic acid extraction preparation process, various strains capable of forming dominant bacterial flora are prepared into high-efficiency microbial preparations, and the high-efficiency microbial preparations are added into a wastewater treatment system according to a certain amount to accelerate the degradation of the pollutants by the microorganisms, so that the biological treatment efficiency of the system is improved, and the stable operation of the system is ensured. The microbial composite fertilizer contains various microorganisms with excellent degradation capability on difficultly-degraded pollutants, and the strains are reasonably compatible, symbiotic and coordinated, are not antagonistic to each other, have high activity, large biomass and quick propagation, are added into a wastewater treatment system, have good degradation effect on macromolecules and difficultly-degraded substances, and have unique treatment effect on wastewater discharged in the traditional ammonia-acid process. Is suitable for the treatment of the wastewater generated by the preparation method, can improve the treated water quantity and the treated water quality, reduce the operating cost and promote the standard-reaching discharge.
3 the traditional carrier is easy to precipitate, the microbial preparation is obtained by granulating the carrier and bacterial liquid, has large specific surface area, strong thallus adhesion and density equivalent to that of a water body, can be suspended in the water body, avoids the influence on the decontamination effect caused by uneven distribution of microorganisms due to overlarge preparation density and precipitation at the bottom of the pool, can also reduce the yield of sludge, and is beneficial to removing pollutants such as COD (chemical oxygen demand) and ammonia nitrogen in waste liquid.
The specific implementation mode is as follows:
example 1:
the glutamic acid fermentation liquor of the Fufeng workshop is obtained by the following steps:
A. natural sedimentation
Flowing the glutamic acid fermentation industrial wastewater through a multiple grid, gradually reducing grid gaps of the multiple grid, discharging into a sedimentation tank, adding an adsorbent, adding the adsorbent into the wastewater according to the addition amount of 0.3kg per ton of wastewater, blowing air in, and performing sedimentation treatment to obtain the supernatant of the industrial wastewater;
the adsorbent is as follows: mixing the shell powder, granite and polymerized ferric sulfate according to the mass ratio of 5:4: 1;
B. hydrolytic acidification anaerobic biochemical treatment
Discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, adjusting the pH to 4, and then discharging into a hydrolysis acidification tank for hydrolysis acidification anaerobic biochemical treatment to obtain hydrolysis acidified industrial wastewater;
C. bioremediation process
Discharging the hydrolyzed and acidified industrial wastewater in the step B into a sedimentation tank, adjusting the pH value to 6.5, adding a bioremediation agent for advanced treatment, adding 2 g of the bioremediation agent into each cubic meter of the liquid every time, adding the bioremediation agent for 1 time every day, continuously adding the bioremediation agent for 7 days, standing for 3 days, and finally filtering and discharging the industrial wastewater through a plate and frame filter; the plate frame filter is used for collecting microbial thalli, and avoids polluting a water body. Thus obtaining the discharge water meeting the environmental protection standard.
The bioremediation preparation is prepared by mixing a compound microbial agent and a carrier according to the weight ratio of 3:2, wherein the active ingredients of the compound microbial agent comprise the following raw materials in parts by weight:
4 parts of rhodococcus fermentation liquor, 5 parts of bacillus pumilus fermentation liquor, 2 parts of penicillium heterobiotic fermentation liquor and 3 parts of micrococcus luteus fermentation liquor.
The Rhodococcus is Rhodococcus (Rhodococcus rhodochrous) ATCC 15906; see the literature of Cloning and Characterization of Benzoate Carbolic Genes in the Gram-specific polychlorinated Biphenyl Degrader Rhodococcus sp. straight RHA1, J.bacteriol.November 2001;
the Bacillus pumilus is Bacillus pumilus (Bacillus pumnlis) CCTCC NO. M2014225 (CN 104263677);
the Penicillium heterobiotic is Penicillium heterobiotic (Penicillium divarsum) ATCC 10437;
said Micrococcus luteus (Micrococcus luteus) is ATCC 49442.
Culturing the above Rhodococcus, Bacillus pumilus, Penicillium xenogeneum, and Micrococcus luteus according to conventional methodThe concentration is controlled to be 1 x 108Mixing the cultured bacteria liquid according to the mass ratio to obtain the compound microbial agent;
the preparation method of the carrier comprises the following steps:
putting zeolite and kaolinite into a pulverizer according to the mass ratio of 2:1 for pulverizing, and then grinding into powder of 100 meshes; putting the powder, starch and chitosan into a stirrer according to the mass ratio of 2:2:1, stirring at 1000rpm for 10min to obtain a mixed material, adding the mixed material and polystyrene microspheres into a granulator according to the mass ratio of 1:1, and then adding a polyvinyl alcohol aqueous solution with the concentration of 6wt% accounting for 30% of the mass of the polystyrene microspheres to prepare particles with the particle size of 1-2 mm; drying the particles in an oven at 80 deg.C for 30min, sintering in a sintering furnace at 700 deg.C for 20min, taking out, and naturally cooling to room temperature.
Adding 2 g of bioremediation agent into each cubic meter of liquid every time, adding for 1 time every day, continuously adding for 7 days, standing for 3 days, and finally filtering and discharging through a plate-and-frame filter; the plate frame filter is used for collecting microbial thalli, and avoids polluting a water body. Thus obtaining the discharge water meeting the environmental protection standard.
Example 2:
the glutamic acid fermentation liquor of the Fufeng workshop is obtained by the following steps:
A. natural sedimentation
Flowing the glutamic acid fermentation industrial wastewater through a multiple grid, gradually reducing grid gaps of the multiple grid, discharging into a sedimentation tank, adding an adsorbent, adding the adsorbent into the wastewater according to the addition amount of 0.3kg per ton of wastewater, blowing air in, and performing sedimentation treatment to obtain the supernatant of the industrial wastewater;
the adsorbent is as follows: mixing the shell powder, granite and polymerized ferric sulfate according to the mass ratio of 5:4: 1;
B. hydrolytic acidification anaerobic biochemical treatment
Discharging the supernatant of the industrial wastewater in the step A into an acid-base adjusting tank, adjusting the pH to 6, and then discharging into a hydrolysis acidification tank for hydrolysis acidification anaerobic biochemical treatment to obtain hydrolysis acidified industrial wastewater;
C. bioremediation process
Discharging the hydrolyzed and acidified industrial wastewater in the step B into a sedimentation tank, adjusting the pH value to 7.0, adding a bioremediation agent for advanced treatment, adding 3 g of the bioremediation agent into each cubic meter of liquid every time, adding the bioremediation agent for 1 time every day, continuously adding the bioremediation agent for 5 days, standing for 3 days, and finally filtering and discharging the industrial wastewater through a plate and frame filter; the plate frame filter is used for collecting microbial thalli, and avoids polluting a water body. Thus obtaining the discharge water meeting the environmental protection standard.
The bioremediation preparation is prepared by mixing a compound microbial agent and a carrier according to the weight ratio of 2:1, wherein the active ingredients of the compound microbial agent comprise the following raw materials in parts by weight:
4 parts of rhodococcus fermentation liquor, 5 parts of bacillus pumilus fermentation liquor, 2 parts of penicillium heterobiotic fermentation liquor and 3 parts of micrococcus luteus fermentation liquor.
The Rhodococcus is Rhodococcus (Rhodococcus rhodochrous) ATCC 15906; see the literature of Cloning and Characterization of Benzoate Carbolic Genes in the Gram-specific polychlorinated Biphenyl Degrader Rhodococcus sp. straight RHA1, J.bacteriol.November 2001;
the Bacillus pumilus is Bacillus pumilus (Bacillus pumnlis) CCTCC NO. M2014225 (CN 104263677);
the Penicillium heterobiotic is Penicillium heterobiotic (Penicillium divarsum) ATCC 10437;
said Micrococcus luteus (Micrococcus luteus) is ATCC 49442.
The concentration of Rhodococcus, Bacillus pumilus, Penicillium xenobiotum and Micrococcus luteus is controlled at 1 × 108Mixing the cultured bacteria liquid according to the mass ratio to obtain the compound microbial agent;
the preparation method of the carrier comprises the following steps:
putting zeolite and kaolinite into a pulverizer according to the mass ratio of 2:1 for pulverizing, and then grinding into powder of 100 meshes; putting the powder, starch and chitosan into a stirrer according to the mass ratio of 2:2:1, stirring at 1000rpm for 10min to obtain a mixed material, adding the mixed material and polystyrene microspheres into a granulator according to the mass ratio of 1:1, and then adding a polyvinyl alcohol aqueous solution with the concentration of 6wt% accounting for 30% of the mass of the polystyrene microspheres to prepare particles with the particle size of 1-2 mm; drying the particles in an oven at 80 deg.C for 30min, sintering in a sintering furnace at 700 deg.C for 20min, taking out, and naturally cooling to room temperature.
EXAMPLE 3 Effect of treating waste Water
Taking glutamic acid fermentation waste liquid of a Fufeng production workshop as an example (COD is 934mg/L, ammonia nitrogen is 226mg/L, and sulfide is 77 mg/L), taking the method of the embodiment 1 as an example, and sampling to determine COD, ammonia nitrogen and sulfide data; and a control group is set, and the compatibility effect of each strain in the microbial inoculum is detected:
control group 1: the procedure of example 1 was repeated except that no Rhodococcus was added;
control group 2: the procedure of example 1 was repeated except that Bacillus pumilus was not added;
control group 3: the procedure of example 1 was repeated except that no Penicillium xenobiotic was added;
control group 4: the procedure of example 1 was repeated except that Micrococcus luteus was not added;
control 5 group: the procedure of example 1 was followed without adding the adsorbent of step A.
Specific detection results are shown in table 1:
TABLE 1 examples of wastewater treatment
| Example 1 (mg/L) | Control group 1 (mg/L) | Control group 2 (mg/L) | Control group 3 (mg/L) | Control group 4 (mg/L) | Control group 5 mg/L | |
| COD removal Rate (%) | 98.4% | 46.5% | 45.4% | 70.6% | 57.1% | 66.3% |
| NH3-N removal (%) | 99.1% | 60.7% | 62.3% | 48.7% | 79.3% | 40.5% |
| Sulfide removal rate (%) | 99.7% | 50.4% | 70.3% | 41.5% | 38.9% | 40.2% |
| Clarity of the product | 28cm | 17cm | 14cm | 18cm | 15cm | 15cm |
The conclusion is that the preparation has reasonable compatibility of fungi and strong cooperativity, and can effectively remove COD, ammonia nitrogen and sulfide in the fermentation waste liquid by matching with a physical adsorbent.
Example 4
Test groups: the method of example 1 of the invention;
control group: the inventor's prior invention patent technology ' a biochemical preparation for treating glutamic acid fermentation sewage ' detects the indexes of microbial preparation, such as density, replacement frequency, sludge production and the like, and concretely refers to table 2:
TABLE 2 study experiment of vectors
| Index (I) | Density g/ml | Frequency of replacement d | Sludge production g/L at day 10 | Sludge production g/L at day 20 |
| Test group | 1.04 | 60d | 3.7 | 8.8 |
| Control group | 1.27 | 20d | 8.9 | 19.5 |
The carrier is modified and granulated, so that the microbial inoculum is more uniformly distributed, the agglutination and conversion of pollutants are accelerated, micro particles and pollutants in a water body are coagulated into flocculating constituents, the replacement and use frequency is reduced, and the generation of sludge is reduced.
The foregoing list is only illustrative of the preferred embodiments of the present invention. It is obvious that the invention is not limited to the above embodiments, but that many variations are possible. All modifications which can be derived or suggested by a person skilled in the art from the disclosure of the present invention are to be considered within the scope of the invention.
Claims (4)
1. A method for restoring amino acid fermentation wastewater by using a biochemical technology is characterized by comprising the following steps:
(1) and (3) natural sedimentation: allowing the amino acid fermentation wastewater to flow through multiple grids, discharging into a sedimentation tank, adding an adsorbent, adding the adsorbent into the wastewater according to the addition amount of 0.3kg per ton of wastewater, and performing sedimentation treatment; the grid gaps of the multiple grids are gradually reduced; the adsorbent is prepared by mixing shell powder, granite and polymeric ferric sulfate according to the mass ratio of 5:4: 1;
(2) hydrolysis acidification anaerobic biochemical treatment:
discharging the naturally settled wastewater into an acid-base adjusting tank, adjusting the pH to 3-7, and then discharging into a hydrolysis acidification tank for hydrolysis acidification anaerobic biochemical treatment;
(3) the bioremediation treatment specifically comprises:
discharging the industrial wastewater subjected to hydrolytic acidification anaerobic biochemical treatment into a sedimentation tank, adjusting the pH value to 6.5-7.0, adding a bioremediation agent for advanced treatment, adding 2-3 g of the bioremediation agent per cubic meter of liquid every time, adding the bioremediation agent 1 time per day, continuously adding the bioremediation agent for 5-7 days, and standing for 3 days;
the bioremediation preparation is prepared by mixing a compound microbial agent and a carrier according to the weight ratio of 3-2:2-1, wherein the compound microbial agent comprises the following raw materials in parts by weight:
4 parts of rhodococcus fermentation liquor, 5 parts of bacillus pumilus fermentation liquor, 2 parts of penicillium heterobiotic fermentation liquor and 3 parts of micrococcus luteus fermentation liquor;
the Rhodococcus is Rhodococcus rhodochrous (Rhodococcus rhodochrous) ATCC 15906;
the Bacillus pumilus is Bacillus pumilus (Bacillus pumnlis) CCTCC number M2014225;
the Penicillium heterobiotic is Penicillium heterobiotic (Penicillium divarsum) ATCC 10437;
said Micrococcus luteus (Micrococcus luteus) is ATCC 49442.
2. The method according to claim 1, wherein the complex microbial agent is prepared by the following steps:
the concentration of Rhodococcus, Bacillus pumilus, Penicillium xenobiotum and Micrococcus luteus is controlled at 1 × 108And mixing the cultured bacteria liquid according to the weight ratio.
3. The method according to claim 1, wherein the carrier is prepared by a method comprising:
putting zeolite and kaolinite into a pulverizer according to the mass ratio of 2:1 for pulverizing, and then grinding into powder of 100 meshes; putting the powder, starch and chitosan into a stirrer according to the mass ratio of 2:2:1, stirring for 10min at 1000rpm to obtain a mixed material, adding the mixed material and polystyrene microspheres into a granulator according to the mass ratio of 1:1, adding a polyvinyl alcohol aqueous solution with the concentration of 6wt% accounting for 30% of the mass of the polystyrene microspheres, drying for 30min in an oven at 80 ℃ after granulation, putting the dried mixture into a sintering furnace for sintering at the sintering temperature of 700 ℃, preserving the heat for 20min, taking out, and naturally cooling to room temperature to obtain the starch-chitosan composite material.
4. The method of claim 1, wherein the amino acid is glutamic acid.
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