CN113697962B - Method for removing ammonium and sulfate radical in sewage by calcium carbonate-rich substance mediated algae - Google Patents
Method for removing ammonium and sulfate radical in sewage by calcium carbonate-rich substance mediated algae Download PDFInfo
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Abstract
The invention discloses a method for removing ammonium and sulfate radical in sewage by mediating algae with calcium carbonate-rich substances, which comprises the following steps: s1, modifying sewage; s2, adding calcium carbonate-rich substances; s3, culturing microalgae; s4, harvesting microalgae. The invention takes mining ammonium sulfate sewage as a material, utilizes microalgae to culture in the ammonium sulfate sewage and simultaneously remove ammonium and sulfate radicals in the water, and does not need to adjust the pH value of a microorganism culture system in the treatment process. The ammonium radical removal rate of the mining tail water can reach 80-100%, the sulfate radical removal rate can reach 50-82%, and the pH value is not required to be regulated in the process, so that the method has the advantages of short-time high efficiency, greenness, safety and energy conservation.
Description
Technical Field
The invention belongs to the field of environmental protection and energy, and particularly relates to a method for removing ammonium and sulfate radical in sewage by mediating algae with calcium carbonate-rich substances.
Background
The development of human life is not separated from the development and utilization of mineral resources, but for China in the industry regulation period, the development mode of mining coarseness is obviously not suitable for sustainable ecological construction and pollution control. The developed tailing tail water pollutes the surrounding environment through a series of chemical reactions and also endangers the health of human bodies.
Taking rare earth mining as an example, rare earth element is called as industrial vitamin and is an important component of modern high-tech, and particularly plays an important role in the fields of information storage, flexible electronics, digital technology, energy conversion and storage equipment, superconductor technology and the like. Today, global rare earth annual demand is about 17 ten thousand tons. At present, china, north America, australia, india and other countries or regions are main production countries of rare earth, and China accounts for more than 70% of the total yield of rare earth in the world. In rare earth production, ammonium sulfate is typically used as a leaching agent to extract rare earth from ore. However, a large amount of ammonium sulfate reagent is needed in the process of leaching and precipitation, and the tail water in mountain after ore closure can form huge amount of high-concentration ammonia nitrogen sewage, and according to the prior report, the rare earth mining industry generates more than 20 hundred million tons of ammonium sulfate sewage containing 1-18g/L per year (Shaohua Yin, kaihua Chen, C.Srinivakannan, shenghui Guo, shiwei Li, jinhui Peng, libo Zhang, (2018) Enhancing recovery of ammonia from rare earth wastewater by air stripping combination of microwave heating and high gravity technology.chemical Engineering Journal,337, 515-521). It is well known that the discharge of wastewater rich in ammonium sulfate in rivers, lakes and oceans accelerates eutrophication of water bodies, and generates carcinogens (such as nitrite) and toxic hydrogen sulfide gas through microbial action, causing degradation of quality of drinking water and soil in cultivated lands through natural infiltration. Therefore, the search for an effective method for treating wastewater rich in ammonium sulfate is urgent for the national economy development.
At present, in order to remove ammonium or sulfate salt ions in industrial wastewater, the domestic treatment process mainly comprises a physical adsorption method, a chemical precipitation method and a biological denitrification and desulfurization method. Compared with chemical and physical methods, biological methods (also known as bioremediation) have significant advantages in wastewater treatment: 1) Is environment-friendly and has no secondary pollution; 2) The cost is low, and the use of expensive equipment is reduced; 3) The microbial cells can be used for the development of feeds and high-value-added biomass. Such as: mohammadi et al developed an effective biological method for removing sulfate (5231.1 mg/L) from power plant wastewater using photoautotrophic microalgae, by culturing microalgae in the wastewater for 20 days, 32% of the sulfate could be removed, and the cultured microalgae biomatrix was used for biodiesel production (Mohammadi, M., mowlea, D., esmaeilzadeh, F., & Ghalemi, Y. (2018). Cultivation of microalgae in apower plant wastewater for sulfate removal and biomass production: A batch student. Journal of Environmental Chemical Engineering,6 (2), 2812-2820.). In Wang et al, ammonium in industrial wastewater can be effectively removed by utilizing the culture method of the mixed culture of Chlorella pyrenoidosa in a 50L photobioreactor at an ammonium removal rate of 1800mg/L per day. It is worth noting that the existing wastewater treatment research mainly focuses on the removal of ammonium or sulfate by established biological processes, and no research on wastewater treatment for simultaneous removal of ammonium or sulfate is carried out, which results in complicated steps and high cost in treating actual high-ammonium sulfate wastewater, and waste of resources. The modern sewage treatment process has the advantages that on the premise of ensuring the target treatment performance, the equipment investment is saved, the process requirements of 'green, high-efficiency and safety' are met, and the comprehensive utilization rate of byproducts is improved, so that the purposes of saving resources and improving the sewage discharge quality are achieved.
Chinese patent application CN202011136509.0 discloses a method for treating, purifying and recycling microalgae of garbage penetrating fluid. The invention takes garbage penetrating fluid as raw material, carries out microfiltration treatment on the garbage penetrating fluid to obtain clear liquid, then dilutes the clear liquid to form microalgae culture solution, and then inoculating microalgae species for culture. The microalgae absorb and utilize the nutrition and harmful substances in the garbage penetrating fluid in the growth process, so that the garbage penetrating fluid is purified. The method takes microalgae as a strain, can obviously reduce COD, ammonia nitrogen and total phosphorus of garbage penetrating fluid, and meets the requirement of sewage discharge. However, the pH of the culture medium is required to be frequently adjusted in the microalgae culture stage, and the culture medium is complex in operation. Moreover, the invention is not mentioned about the sulfate radical removal of sewage, and has not been applied to the simultaneous removal of ammonium and sulfate radicals in ammonium sulfate sewage.
Chinese patent application CN111936427a discloses a device for anaerobically treating acetic acid wastewater containing high concentration sulfate ions by microorganisms. The anaerobic biological treatment device mainly comprises a water inlet distributor, a water distributor, a lower three-phase separator, an upper three-phase separator, a lower reaction chamber, an upper reaction chamber, an internal circulation device, an external circulation device and a dosing device, and is energy-saving and environment-friendly, low in medicament loss, low in power consumption, high in volume load mass transfer rate and high in impact load resistance. However, the device of the invention needs to throw a large amount of medicine, needs to control the pH value in real time by using alkali liquor, has complex operation and high instrument performance requirement, and cannot meet the equipment requirement in a conventional laboratory; meanwhile, the invention does not mention the aspect of the removal of ammonium radical in sewage, and can not be applied to the simultaneous removal of ammonium radical and sulfate radical in ammonium sulfate sewage.
In view of the above, it is particularly important to develop a process that is simple to operate, efficient in a short time, environmentally friendly and energy-saving, and can simultaneously remove ammonium and sulfate from industrial wastewater.
Disclosure of Invention
In order to solve the problems, the invention aims to provide a method for simultaneously removing ammonium and sulfate radicals in ammonium sulfate sewage by mediating algae with calcium carbonate-rich substances, which takes rare earth mining tail water as a raw material, utilizes calcium carbonate-rich mediating microalgae treatment to cooperatively remove sulfate radicals and ammonium ions in the ammonium sulfate sewage, and obtains valuable microalgae organisms, and is short-time, efficient, energy-saving and environment-friendly.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a method for removing ammonium and sulfate radical in sewage by using calcium carbonate-rich substances to mediate algae, which comprises the following steps:
s1, sewage modification: measuring the relative nutrition indexes such as ammonium ion concentration, sulfate ion concentration and the like of mining sewage, and diluting or adding certain types of nutrition substances into the sewage;
s2, adding a calcium carbonate-rich substance: adding a certain amount of calcium carbonate-rich substances into the sewage;
s3, culturing microalgae: inoculating microalgae species into the sewage, and culturing the microalgae;
s4, algae collection: taking cultured algae cells, centrifuging, removing supernatant, wherein the supernatant is treated sewage, and simultaneously obtaining microalgae biological matrix.
In the step S1, the dilution multiple of the sewage is 1-10 times, and the added nutrient substances are organic carbon sources or phosphates. The organic carbon source is glucose, sucrose, molasses, citric acid, lactic acid, sodium acetate or methanol, and the phosphate is dipotassium hydrogen phosphate or disodium hydrogen phosphate.
In the step S2, the calcium carbonate-rich substance is a substance with high calcium carbonate content such as calcium carbonate, oyster shell, eggshell and the like, and the addition amount of the calcium carbonate-rich substance is 1-10 g/L.
In the step S3, the microalgae are one or more of chlamydomonas, chlorella, chain belt algae, scenedesmus, spirulina, aphanizomenon, and Euglena, and the inoculation amount of the microalgae is 0.05-2g/L.
In the step S3, the microalgae are cultivated in a photoautotrophic or heterotrophic way, wherein the condition of the autotrophic cultivation is that the temperature is 23-40 ℃, the illumination intensity is 1000-15000 Lux, and the time is 5-50 days; the heterotrophic culture conditions are that the temperature is 25-40 ℃ and the time is 1-10 days.
In step S4, the algae collection conditions are: the centrifugal speed is 1000-8000 rpm, and the treatment time is 1-10 min.
The invention has the following beneficial effects:
1. in the prior art, only one of ammonium or sulfate radical can be removed when the microalgae is used for treating ammonium sulfate sewage, one procedure is added to remove the other pollutant after the microalgae is treated, the pH value is frequently regulated in the treatment process, and the process cost is increased. In the method, when the microalgae is used for treating ammonium sulfate sewage, a certain amount of calcium carbonate-rich substances are added into the system, the pH value is not required to be regulated in the treatment process, the ammonium in the sewage is absorbed by the microalgae to synthesize a valuable biological matrix in the culture process, sulfate radicals react with dissolved calcium ions to precipitate, so that the ammonium radicals and the sulfate radicals are removed simultaneously in one process, and the method has the advantages of simplicity and convenience in operation, low instrument performance requirement, low cost and high efficiency. The invention is used for treating the ammonium sulfate sewage with the concentration of 7.5g/L, the ammonium radical removal rate reaches 80-100%, and the sulfate radical removal rate reaches 50-82%. The method has simple operation and good sewage purification effect.
2. In the present invention, the organic carbon source added in modifying the culture medium is glucose, sucrose, molasses, citric acid, lactic acid, sodium acetate, methanol or the like. Organic carbon can promote microalgae metabolic process to synthesize alphaKetoglutarate to resist the stress of high ammonium sulfate concentration, raise the growth rate of microalgae and increase the utilization of ammonium ion in sewage. The added calcium-rich substances include calcium carbonate, oyster shell, eggshell, shell, etc., and the solubility of the calcium-rich substances in water is extremely low, so that the pH of the microalgae culture medium cannot be raised, the nitrogen source of the ammonium sulfate sewage is continuously absorbed and free H is generated in the culture process + The reaction with calcium carbonate in real time replaces Ca 2+ The pH of the culture solution is neutralized, ca 2+ But also can react with sulfate radical to produce calcium ammonium sulfate precipitate.
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FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The invention will be described in detail with reference to specific examples. The examples are provided only for further explanation of the present invention and the scope of the present invention is not limited to the examples.
The methods involved in the examples for ammonium ion detection and sulfate detection are as follows:
(1) The ammonium ion detection comprises the following steps:
a. respectively measuring the light absorption value of the diluted water sample and Nami reagent mixed solution at 420nm by using a spectrophotometer, and substituting the light absorption value into a standard curve;
b. and (3) calculating: ammonium ion concentration=a 420 X 5.3901 x dilution.
Ammonium ion removal = 100% × (Ni-Nn)/Ni.
Wherein Ni is the initial concentration (mg/L) of ammonium ions in the sewage, and Nn is the concentration (mg/L) of ammonium ions in the sewage after treatment for n days; (2) sulfate ion detection comprising the steps of:
a. free sulfate radical in the sewage and barium ions quantitatively generate barium sulfate precipitate. The precipitate is weighed after washing and drying, and the sulfate radical content can be obtained according to the quality of the barium sulfate.
b. And (3) calculating: sulfate content = m1×96/233. Wherein M1 is the weight of dried barium sulfate;
sulfate ion removal = 100% × (Ci-Cn)/Ci.
Wherein Ci is the initial concentration of sulfate ions in the sewage (mg/L), and Cn is the concentration of sulfate ions in the sewage (mg/L) after n days of treatment.
Example 1
A method for removing ammonium and sulfate radical in ammonium sulfate sewage by mediating algae with rich calcium carbonate substance comprises the following steps:
s1, modifying sewage, namely adding 1000mg/L dipotassium hydrogen phosphate and 40g/L glucose into a reactor containing rare earth exploitation tail water, wherein the working volume is 1L, and sterilizing for 20 minutes at a high temperature of 115 ℃ by using rare earth exploitation tail water as a sewage raw material, wherein the concentration of ammonium ions is about 2000mg/L and the concentration of sulfate ions is about 5570 mg/L.
S2, adding a calcium carbonate-rich substance, adding calcium carbonate powder with the fineness of about 100 meshes into the modified sewage with the adding proportion of 5g/L, and then sterilizing for 20 minutes at the high temperature of 115 ℃.
S3, culturing microalgae, namely inoculating a strain of the microalgae into the sewage, and inoculating a strain of the microalgae into the sewage according to the ratio of 0.05g/L by taking chlorella as a strain of the microalgae, wherein the culture conditions are as follows: culturing at 28deg.C for 10 days in the dark;
s4, collecting the algae, taking cultured algae liquid, centrifuging at 3000rpm for 5min, removing supernatant to obtain wet algae, wherein the algae can be used for developing high-added-value products, and the supernatant is the treated rare earth mining sewage; in this case, the removal rate of ammonium ions of the rare earth mining sewage was 100%, the removal rate of sulfate radicals was 80%, and 17g/L of the microalgae biomatrix was obtained.
Example 2
A method for removing ammonium and sulfate radical in ammonium sulfate sewage by mediating algae with rich calcium carbonate substance comprises the following steps:
s1, modifying sewage: the method comprises the steps of taking rare earth exploitation tail water with the concentration of ammonium ions of 2000mg/L and the concentration of sulfate ions of 5570mg/L as a sewage raw material, adding 7L of rare earth exploitation tail water into a 10L microbial fermentation tank, and adding 1000mg/L of dipotassium hydrogen phosphate and 40g/L of glucose, wherein the working volume is 7L.
S2, adding calcium carbonate-rich substances, adding oyster shell powder with fineness of about 100 meshes into a fermentation tank, adding the oyster shell powder with the adding ratio of 5g/L, and sterilizing for 20 minutes at the high temperature of 115 ℃.
S3, culturing microalgae, namely inoculating a strain of the microalgae into a fermentation tank added with oyster shell powder, taking chlorella as a strain of the microalgae, and inoculating a strain of the microalgae according to the proportion of 0.05g/L, wherein the culture conditions are as follows: the culture was carried out at 28℃with aeration rate of 7L/min for 56 hours in the dark.
S4, collecting the algae, taking cultured algae liquid, centrifuging at 3000rpm for 5min, removing supernatant to obtain wet algae, wherein the algae can be used for developing high-added-value products, and the supernatant is the treated rare earth mining sewage; in this case, the removal rate of ammonium ions of the rare earth mining sewage was 100%, the removal rate of sulfate radicals was 80%, and 21g/L of the microalgae biomatrix was obtained.
Example 3
A method for removing ammonium and sulfate radical in ammonium sulfate sewage by mediating algae with rich calcium carbonate substance comprises the following steps:
s1, modifying sewage: the rare earth mining tail water with the concentration of ammonium ions of about 2000mg/L and the concentration of sulfate ions of about 5570mg/L is taken as a sewage raw material, and 1000mg/L of dipotassium hydrogen phosphate is added into a reactor containing 700mL of rare earth mining tail water.
S2, adding calcium carbonate-rich substances, adding calcium carbonate powder with fineness of about 100 meshes into a reactor, wherein the adding proportion is 5g/L, and sterilizing for 20 minutes at a high temperature of 115 ℃.
S3, culturing microalgae, namely inoculating a strain of the microalgae into the reactor, taking the chlamydomonas as a strain of the microalgae, and inoculating a strain of the microalgae according to the proportion of 0.05g/L, wherein the culture conditions are as follows: the temperature is 25 ℃, the aeration rate is 700mL/min, the illumination intensity is 3000Lux, the culture time is 50 days, and 90% of algae cells are collected from the algae liquid every 10 days of culture.
S4, collecting algae, culturing algae cells after 50 days, centrifuging at 5000rpm for 5min, and removing supernatant to obtain wet algae, wherein the algae can be used for developing high-added-value products, and the supernatant is treated rare earth mining sewage; in this case, the removal rate of ammonium ions of the rare earth mining sewage was 100%, the removal rate of sulfate radicals was 82%, and 8g/L of microalgae biomatrix was obtained.
Example 4
A method for removing ammonium and sulfate radical in ammonium sulfate sewage by mediating algae with rich calcium carbonate substance comprises the following steps:
s1, modifying sewage: rare earth exploitation tail water with the concentration of ammonium ions of about 2000mg/L and the concentration of sulfate ions of about 5570mg/L is taken as a sewage raw material, the rare earth exploitation tail water is diluted to 10 percent, 700mL of diluted rare earth exploitation tail water is added into a 1L triangular flask, and simultaneously 100mg/L of dipotassium hydrogen phosphate is added.
S2, adding calcium carbonate-rich substances, adding calcium carbonate powder with fineness of about 100 meshes into the sewage at the adding ratio of 1g/L, and sterilizing for 20 minutes at the high temperature of 115 ℃.
S3, culturing microalgae, namely inoculating a strain of the microalgae into the sewage, taking chlamydomonas as a strain of the microalgae, and inoculating a strain of the microalgae according to the proportion of 0.05g/L, wherein the culture conditions are as follows: the temperature was 25℃and the aeration rate was 700mL/min, the illumination intensity was 3000Lux, and the culture time was 10 days.
S4, collecting the algae, centrifuging the cultured algae cells at 5000rpm for 5min, and removing the supernatant to obtain wet algae, wherein the algae can be used for developing high-added-value products, and the supernatant is the treated rare earth mining sewage; in this case, the removal rate of ammonium ions of the rare earth mining sewage was 100%, the removal rate of sulfate was 50%, and 1.6g/L of the microalgae biomatrix was obtained.
Example 5
A method for removing ammonium and sulfate radical in ammonium sulfate sewage by mediating algae with rich calcium carbonate substance comprises the following steps:
s1, modifying sewage: rare earth exploitation tail water with the concentration of ammonium ions of about 2000mg/L and the concentration of sulfate ions of about 5570mg/L is used as a sewage raw material, and the rare earth exploitation tail water is diluted to 10% of the original volume. A50L column type photoreactor was charged with 40L of diluted rare earth mining tail water, while 100mg/L dipotassium hydrogen phosphate was added.
S2, adding calcium carbonate-rich substances, and adding eggshell slices into a light column reactor at the addition ratio of 1g/L.
S3, culturing microalgae, namely inoculating a strain of the microalgae into the reactor, inoculating a strain of the microalgae into the reactor according to the ratio of 0.05g/L, wherein the culture conditions are as follows: the temperature was 25℃and the aeration rate was 20L/min, the light intensity was 4000Lux, and the culture time was 10 days.
S4, collecting the algae, centrifuging the cultured algae cells at 5000rpm for 5min, and removing the supernatant to obtain wet algae, wherein the algae can be used for developing high-added-value products, and the supernatant is the treated rare earth mining sewage; in this case, the removal rate of ammonium ions of the rare earth mining sewage was 100%, the removal rate of sulfate was 50%, and 1.4g/L of the microalgae biomatrix was obtained.
The following comparative examples 1 and 2, which are specific examples, were carried out by using the microalgae autotrophic and heterotrophic treatment method for the rare earth mining tail water:
comparative example 1
1. Modification of sewage: the rare earth mining tail water with the concentration of ammonium ions of about 2000mg/L and the concentration of sulfate ions of about 5570mg/L is taken as a sewage raw material, and 1000mg/L of dipotassium hydrogen phosphate is added into a reactor containing 700mL of rare earth mining tail water.
2. Culturing microalgae, namely inoculating a microalgae strain into the reactor, taking chlamydomonas as a culture strain, and inoculating microalgae seeds according to the proportion of 0.05g/L, wherein the culture conditions are as follows: the temperature is 25 ℃, the aeration rate is 700mL/min, the illumination intensity is 3000Lux, the culture time is 50 days, and 90% of algae cells are collected from the algae liquid every 10 days of culture.
3. pH adjustment during the incubation period, the pH of the microalgae broth was set to 7.0 using 0.1M NaOH per day.
4. Collecting algae, culturing algae cells after 50 days, centrifuging at 5000rpm for 5min, and removing supernatant to obtain wet algae, wherein the algae can be used for developing high added value products, and the supernatant is treated rare earth mining sewage; in this case, the removal rate of ammonium ions of the rare earth mining sewage was 80%, the removal rate of sulfate radical was 5%, and at the same time, a microalgae biological matrix of 7.5g/L was obtained.
For example 2
1. And (3) modifying sewage, namely adding 1000mg/L dipotassium hydrogen phosphate and 40g/L glucose into a reactor containing the rare earth mining tail water, wherein the working volume is 1L, and sterilizing for 20 minutes at the high temperature of 115 ℃ by using the rare earth mining tail water as a sewage raw material, wherein the concentration of ammonium ions is about 2000mg/L and the concentration of sulfate ions is about 5570 mg/L.
2. Culturing microalgae, namely inoculating a strain of microalgae into the sewage, inoculating a strain of microalgae into the sewage according to the ratio of 0.05g/L by taking chlorella as the strain of microalgae, wherein the culture conditions are as follows: culturing at 28deg.C for 10 days in the dark;
3. pH adjustment during the incubation period, the pH of the microalgae broth was set to 7.0 using 0.1M NaOH per day.
4. Collecting algae, centrifuging at 3000rpm for 5min, and removing supernatant to obtain wet algae, which can be used for developing high added value product, wherein the supernatant is treated rare earth mining sewage; in this case, the removal rate of ammonium ions of the rare earth mining sewage was 55%, the removal rate of sulfate was 4%, and a microalgae biological matrix of 7.1g/L was obtained.
As is clear from the above examples and comparative examples, in each of examples 1 to 5 according to the present invention, 100% removal of ammonium ions was obtained by the method of the present invention, and the sulfate removal rate was 50 to 82%. Compared with the comparative example, the method can obviously remove ammonium and sulfate radical with certain concentration at the same time. The invention has another obvious advantage of stabilizing the pH of the culture in real time, ensuring the constant pH of the culture solution and leading the microalgae to grow favorably. Compared with the comparative example, the invention has the advantages of no need of tedious adjustment of pH, short-time and high efficiency, simple and convenient operation, low instrument performance requirement and the like.
The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related arts are included in the scope of the present invention.
Claims (6)
1. A method for removing ammonium and sulfate radical in sewage by using calcium carbonate-rich substances to mediate algae, which is characterized in that: the method comprises the following steps:
s1, sewage modification: measuring the concentration index of ammonium ions and sulfate ions in the sewage, and diluting or adding nutrient substances into the sewage;
s2, adding a calcium carbonate-rich substance: adding calcium carbonate-rich substances into sewage, wherein the calcium carbonate-rich substances are calcium carbonate, oyster shells, shells or eggshells, and the adding amount of the calcium carbonate-rich substances is 1-10 g/L;
s3, culturing microalgae: inoculating microalgae species into the sewage, and culturing the microalgae;
s4, algae collection: taking cultured algae cells, centrifuging, removing supernatant, wherein the supernatant is treated sewage, and simultaneously obtaining microalgae biological matrix.
2. The method for removing ammonium and sulfate from wastewater mediated by calcium carbonate-rich material according to claim 1, wherein the method comprises the steps of: in the step S1, the dilution multiple of the sewage is 1-10 times, and the added nutrient substances are organic carbon sources or phosphates.
3. A method for removing ammonium and sulfate from wastewater mediated by calcium carbonate-rich material according to claim 2, wherein: the organic carbon source is glucose, sucrose, molasses, citric acid, lactic acid, sodium acetate or methanol, and the phosphate is dipotassium hydrogen phosphate or disodium hydrogen phosphate.
4. The method for removing ammonium and sulfate from wastewater mediated by calcium carbonate-rich material according to claim 1, wherein the method comprises the steps of: in the step S3, the microalgae are one or more of chlamydomonas, chlorella, chain belt algae, scenedesmus, spirulina, aphanizomenon, and Euglena, and the inoculation amount of the microalgae is 0.05-2g/L.
5. The method for removing ammonium and sulfate from wastewater mediated by calcium carbonate-rich material according to claim 1, wherein the method comprises the steps of: in the step S3, the microalgae are cultivated in a photoautotrophic or heterotrophic mode, wherein the condition of the autotrophic cultivation is that the temperature is 23-40 ℃, the illumination intensity is 1000-15000 Lux, and the time is 5-50 days; the heterotrophic culture conditions are that the temperature is 25-40 ℃ and the time is 1-10 days.
6. The method for simultaneously removing ammonium and sulfate in ammonium sulfate wastewater by mediating algae with calcium carbonate-rich material according to claim 1, wherein the method comprises the following steps: in step S4, the algae collection conditions are: the centrifugal speed is 1000-8000 rpm, and the treatment time is 1-10 min.
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| CN108147577A (en) * | 2017-12-07 | 2018-06-12 | 青岛华拓科技有限公司 | A kind of sewage water treatment method and sewage-treating agent |
| CN109652318B (en) * | 2019-01-31 | 2020-08-18 | 华南理工大学 | Culture medium for rapidly culturing chlorella by stabilizing pH and application thereof |
| CN110627213B (en) * | 2019-06-10 | 2022-05-03 | 华南理工大学 | Method for efficiently treating high-ammonia-nitrogen wastewater by microalgae photo-fermentation method |
| CN111088166A (en) * | 2019-12-26 | 2020-05-01 | 南昌大学 | Method for promoting microorganism to induce calcium carbonate precipitation by phycomycete co-culture system |
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