CN107983312B - Adsorbent composition for removing heavy metal ions in industrial wastewater - Google Patents
Adsorbent composition for removing heavy metal ions in industrial wastewater Download PDFInfo
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Abstract
The invention provides an adsorbent composition for removing heavy metal ions in industrial wastewater, which comprises the following raw materials: 23-28 parts of nano ferroferric oxide, 37-42 parts of lipase liquid, 8-12 parts of sodium humate, 10-12 parts of medical stone powder, 11-13 parts of sodium carboxymethyl starch, 10-12 parts of polyaluminium chloride, 5-8 parts of chitosan, 5-8 parts of sepiolite powder and 5-8 parts of zeolite powder. The raw material components for preparing the adsorbent composition are nontoxic and harmless, secondary pollution after adsorption treatment cannot be caused, the raw material components have excellent adsorption functions, mutual promotion and mutual matching can be realized among the raw material components in the process of preparing the adsorbent composition by mixing, the adsorption effect is cooperatively exerted, and finally the prepared adsorbent composition can well adsorb heavy metal ions in industrial wastewater, and has the advantages of good adsorption effect, high adsorption efficiency, low cost and stable adsorption.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an adsorbent composition for removing heavy metal ions in industrial wastewater.
Background
With the rapid development of industrialization and urbanization in China, heavy metal pollution in water sources and soil becomes more acute due to the large discharge of heavy metal wastewater, and the work of enhancing water pollution prevention and treatment is not slow enough. The industrial wastewater containing heavy metal ions mainly comes from mining, electroplating, machining, metal smelting and part of chemical industry. The wastewater usually contains Pb, Cu, Cr, Hg, Cd, As, Zn, Co, Ni, etc. The pollutant components are different from organic pollutants, cannot be degraded into harmless high-end products after being discharged into the environment, only can change the existing form or be transferred and diluted, and some heavy metal ions are enriched in organisms even through a food chain, respiration or a direct contact path, so that the heavy metal ions pose a threat to the organisms and the human health, and even cause gene mutation or induce cancer when the heavy metal ions are serious.
In order to ensure public health, reasonable and effective removal of water and heavy metals in wastewater becomes an important problem which is commonly concerned by human beings, and an adsorption method becomes a concerned heavy metal wastewater treatment method due to the advantages of simple operation, low cost, reproducibility, no requirement on ion concentration and the like. There are many types of adsorbents currently in use, the most common being activated carbon. The activated carbon has no selectivity, can adsorb various heavy metal ions simultaneously, has large adsorption capacity, but has high cost, short service life, cyclic utilization and high operation cost.
Therefore, there is a need to develop a novel adsorbent composition with wide sources, low price, high adsorption performance and no secondary pollution, so as to better adsorb and remove heavy metal ions in industrial wastewater and improve the adsorption removal rate.
Disclosure of Invention
In view of the above, the invention provides the adsorbent composition for removing heavy metal ions in industrial wastewater, which has the advantages of good adsorption effect, high adsorption efficiency, low cost and stable adsorption, and can not cause secondary pollution after being used.
The invention provides an adsorbent composition for removing heavy metal ions in industrial wastewater, which comprises the following raw materials: 23-28 parts of nano ferroferric oxide, 37-42 parts of lipase liquid, 8-12 parts of sodium humate, 10-12 parts of medical stone powder, 11-13 parts of sodium carboxymethyl starch, 10-12 parts of polyaluminium chloride, 5-8 parts of chitosan, 5-8 parts of sepiolite powder and 5-8 parts of zeolite powder;
further, the raw materials of the adsorbent composition comprise the following components: 25 parts of nano ferroferric oxide, 39 parts of lipase liquid, 10 parts of sodium humate, 11 parts of medical stone powder, 12 parts of sodium carboxymethyl starch, 11 parts of polyaluminium chloride, 6 parts of chitosan, 7 parts of sepiolite powder and 6 parts of zeolite powder;
further, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa;
further, mixing lipase liquid produced by the secretion of pseudomonas fluorescens and lipase liquid produced by the secretion of pseudomonas aeruginosa according to the mass ratio of 3: 2;
further, the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent; the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent; the content of alumina in the polyaluminium chloride is more than or equal to 30 percent;
further, the particle size of the sepiolite powder is 150-200 meshes, and the content of the sepiolite component in the sepiolite powder is not less than 55 percent;
further, the particle size of the medical stone powder is 100-120 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent;
further, the particle size of the zeolite powder is 100-120 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent;
further, the content of the chitosan is more than or equal to 99 percent, and the deacetylation degree is more than 90 percent;
further, the preparation method of the adsorbent composition comprises the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 6.0-7.0, and then stirring the mixture for at least 1h at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for at least 30min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
The invention has the beneficial effects that: the raw material components for preparing the adsorbent composition are nontoxic and harmless, secondary pollution after adsorption treatment cannot be caused, the raw material components have excellent adsorption functions, mutual promotion and mutual matching can be realized among the raw material components in the process of preparing the adsorbent composition by mixing, the adsorption effect is cooperatively exerted, and finally the prepared adsorbent composition can well adsorb heavy metal ions in industrial wastewater, and has the advantages of good adsorption effect, high adsorption efficiency, low cost and stable adsorption.
Wherein: the raw materials of lipase, sodium humate, sodium carboxymethyl starch, chitosan, etc. contain a large amount of active groups, such as carboxyl (-COOH), hydroxyl (-OH), amino (-NH)2) The raw materials can be mutually matched to react with heavy metal ions in the industrial wastewater through complexation, ion exchange and the like after being mixed, so that the heavy metal ions are stably adsorbed, the adsorption stability is improved, and a water-insoluble precipitate is formed; according to the invention, after the nano ferroferric oxide is mixed with lipase liquid, sodium humate, chitosan and the like, active groups can be introduced into the surface of the nano ferroferric oxide, and the active groups can perform complexation and other reactions with heavy metal ions, so that the adsorption effect of the nano ferroferric oxide is combined with the complexation between the surface active groups and the heavy metal ions, and the heavy metal ions in industrial wastewater are jointly adsorbed, so that the adsorption effect of the nano ferroferric oxide on the heavy metal ions is greatly improved, and the mutual synergy and mutual coordination effect among the raw material components are well exerted; due to the bridging action of hydroxide ions and the polymerization action of polyvalent anions, the polyaluminium chloride has larger relative molecular mass and higher charge, and can realize high-degree electric neutralization and bridging action on colloids and particles in the wastewater, thereby powerfully removing heavy metals, colloids, radioactive toxic substances and the like in the wastewater; the medical stone powder, the sepiolite powder and the zeolite powder have higher specific surface area and surface activity due to the own specific loose porous structure, can increase the contact area with the wastewater, thereby having unique adsorption, screening, cation and cation exchange and catalytic performances, and being capable of adsorbing organic compounds and heavy metals in the wastewaterMetal ions and the like.
Detailed Description
The adsorbent composition for removing heavy metal ions in industrial wastewater provided in this embodiment comprises the following raw materials: 23-28 parts of nano ferroferric oxide, 37-42 parts of lipase liquid, 8-12 parts of sodium humate, 10-12 parts of medical stone powder, 11-13 parts of sodium carboxymethyl starch, 10-12 parts of polyaluminium chloride, 5-8 parts of chitosan, 5-8 parts of sepiolite powder and 5-8 parts of zeolite powder;
preferably, the raw materials of the adsorbent composition comprise the following components: 25 parts of nano ferroferric oxide, 39 parts of lipase liquid, 10 parts of sodium humate, 11 parts of medical stone powder, 12 parts of sodium carboxymethyl starch, 11 parts of polyaluminium chloride, 6 parts of chitosan, 7 parts of sepiolite powder and 6 parts of zeolite powder;
in the embodiment, each raw material component for preparing the adsorbent composition is nontoxic and harmless, secondary pollution after adsorption treatment cannot be caused, each raw material component has an excellent adsorption function, mutual promotion and mutual matching can be realized among the raw material components in the process of preparing the adsorbent composition by mixing, the adsorption effect is exerted synergistically, finally, the prepared adsorbent composition can well adsorb heavy metal ions in industrial wastewater, and the adsorbent composition is good in adsorption effect, high in adsorption efficiency, low in cost and stable in adsorption. Wherein the raw materials such as lipase, sodium humate, sodium carboxymethyl starch, chitosan, etc. contain a large amount of active groups, such as carboxyl (-COOH), hydroxyl (-OH), amino (-NH)2) The raw materials are mixed and then can be mutually matched to react with heavy metal ions in the industrial wastewater, such as complexation and ion exchange, so that the heavy metal ions are stably adsorbed, the adsorption stability is improved, water-insoluble precipitate is formed, and affinity and adsorption can be carried out on the raw materials and organic compounds in the wastewater to form hydrogen bonds, and the like, so that harmful substances such as the heavy metal ions and the organic compounds are adsorbed simultaneously; the nano ferroferric oxide has the function of adsorbing heavy metal ions, and in the embodiment, the nano ferroferric oxide can be introduced to the surface of the nano ferroferric oxide after being mixed with lipase liquid, sodium humate, chitosan and the likeThe active groups can perform complexation and other reactions with heavy metal ions, so that the adsorption effect of the nano ferroferric oxide is combined with the complexation between the surface active groups and the heavy metal ions, the heavy metal ions in the industrial wastewater are jointly adsorbed, the adsorption effect of the nano ferroferric oxide on the heavy metal ions is further greatly improved, and the mutual synergy and mutual coordination effect among the raw material components are well played; due to the bridging action of hydroxide ions and the polymerization action of polyvalent anions, the polyaluminium chloride has larger relative molecular mass and higher charge, and can realize high-degree electric neutralization and bridging action on colloids and particles in the wastewater, thereby powerfully removing heavy metals, colloids, radioactive toxic substances and the like in the wastewater; the medical stone powder, the sepiolite powder and the zeolite powder have higher specific surface area and surface activity due to the own specific loose porous structure, and can increase the contact area with the wastewater, so the medical stone powder, the sepiolite powder and the zeolite powder have unique adsorption, screening, cation and anion exchange and catalytic performances, and can adsorb harmful substances such as organic compounds, heavy metal ions and the like in the wastewater.
In the embodiment, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa;
wherein the content of the first and second substances,
the culture method of fluorescent pseudomonas and pseudomonas aeruginosa comprises the following steps:
(1) preparing a beef extract liquid culture medium: weighing 30g of beef extract, 15g of peptone and 15g of sodium chloride, dissolving in 1000mL of distilled water, adjusting pH to 7.0-7.2 by using 0.1mol/L NaOH solution, and then sterilizing in a sterilization pot at 121 ℃ for 5 minutes to obtain the beef extract;
(2) activation of freeze-dried powder: adding freeze-dried powder of fluorescent pseudomonas or pseudomonas aeruginosa into a beef extract liquid culture medium, slightly shaking to uniformly mix the freeze-dried powder to prepare a bacterial suspension, slightly cooling a sterilized LB solid culture medium to prepare a slant culture medium, transplanting part of the bacterial suspension onto the slant culture medium, culturing in a constant-temperature culture box at 37 ℃ to increase the number of bacterial colonies, selecting and culturing sturdy bacterial colonies from the slant culture medium, inoculating the bacterial colonies onto a new slant culture medium for culturing, and repeating the steps for 2-3 times until the fluorescent pseudomonas or pseudomonas aeruginosa with good growth is obtained.
The extraction method of the lipase liquid comprises the following steps:
(1) extracting a crude enzyme solution: centrifuging 0.1mL of a bacterium solution of fluorescent pseudomonas or pseudomonas aeruginosa for at least 10 minutes, and taking supernatant to obtain a crude enzyme solution;
(2) extracting lipase liquid: taking 3mL of the solution with the concentration of 0.0667 mol.L-1Putting phosphate buffer solution and 1mL of oleic acid into a conical flask, uniformly mixing, putting into a constant-temperature water bath kettle at 37 ℃, preheating for at least 5min, then adding the crude enzyme solution extracted in the step (1), stirring for reacting for 10min, immediately adding 8mL of toluene (analytically pure), continuing to stir for reacting for 2min, and stopping the reaction; centrifuging the solution obtained by the steps at 3000r/min for at least 10min, and taking the upper organic mixed solution as lipase solution; when the lipase liquid is extracted, the amounts of the phosphate buffer solution, oleic acid and toluene are adjusted in proportion to the amount of the crude enzyme liquid to be extracted (estimated from the amount of the liquid of Pseudomonas fluorescens or Pseudomonas aeruginosa).
In the embodiment, lipase liquid produced by the secretion of pseudomonas fluorescens and lipase liquid produced by the secretion of pseudomonas aeruginosa are mixed according to the mass ratio of 3: 2; the lipase liquid prepared by mixing the lipase liquids secreted by the pseudomonas fluorescens and the pseudomonas aeruginosa is used for synergistic action with other raw material components, so that a very good heavy metal adsorption effect can be achieved, the problems of bacterial survival, easy secretion of toxic substances of part of bacteria and the like caused by the adsorption of metal ions by the bacteria can be effectively avoided, the harmfulness is greatly reduced, and the lipase liquid is safe and environment-friendly. The lipase liquid is prepared according to the proportion, so that the mutual promotion effect between the two lipase liquids is better and obvious, the promotion effect on other components can be better exerted, and a better adsorption effect is achieved.
In the embodiment, the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent; the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent; the content of alumina in the polyaluminium chloride is more than or equal to 30 percent; ensuring the number of active groups and improving the adsorption effect.
In the embodiment, the particle size of the sepiolite powder is 150-200 meshes, and the content of the sepiolite component in the sepiolite powder is not less than 55%; is convenient for dispersion and improves the adsorption effect.
In the embodiment, the particle size of the medical stone powder is 100-120 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent; is convenient for dispersion and improves the adsorption effect.
In the embodiment, the particle size of the zeolite powder is 100-120 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent; is convenient for dispersion and improves the adsorption effect.
In the embodiment, the content of the chitosan is more than or equal to 99 percent, and the deacetylation degree is more than 90 percent; ensuring the number of active groups and improving the adsorption effect.
In this embodiment, the preparation method of the adsorbent composition includes the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 6.0-7.0, and then stirring the mixture for at least 1h at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for at least 30min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
The following are specific examples
Example one
In the adsorbent composition for removing heavy metal ions from industrial wastewater in this embodiment, the raw materials of the adsorbent composition include the following components: 25 parts of nano ferroferric oxide, 39 parts of lipase liquid, 10 parts of sodium humate, 11 parts of medical stone powder, 12 parts of sodium carboxymethyl starch, 11 parts of polyaluminium chloride, 6 parts of chitosan, 7 parts of sepiolite powder and 6 parts of zeolite powder.
In the embodiment, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa according to the mass ratio of 3: 2;
wherein:
the culture method of fluorescent pseudomonas and pseudomonas aeruginosa comprises the following steps:
(1) preparing a beef extract liquid culture medium: weighing 30g of beef extract, 15g of peptone and 15g of sodium chloride, dissolving in 1000mL of distilled water, adjusting pH to 7.0-7.2 by using 0.1mol/L NaOH solution, and then sterilizing in a sterilization pot at 121 ℃ for 5 minutes to obtain the beef extract;
(2) activation of freeze-dried powder: adding freeze-dried powder of fluorescent pseudomonas or pseudomonas aeruginosa into a beef extract liquid culture medium, slightly shaking to uniformly mix the freeze-dried powder to prepare a bacterial suspension, slightly cooling a sterilized LB solid culture medium to prepare a slant culture medium, transplanting part of the bacterial suspension onto the slant culture medium, culturing in a constant-temperature culture box at 37 ℃ to increase the number of bacterial colonies, selecting and culturing sturdy bacterial colonies from the slant culture medium, inoculating the bacterial colonies onto a new slant culture medium for culturing, and repeating the steps for 2-3 times until the fluorescent pseudomonas or pseudomonas aeruginosa with good growth is obtained.
The extraction method of the lipase liquid comprises the following steps:
(1) extracting a crude enzyme solution: centrifuging 0.1mL of a bacterium solution of fluorescent pseudomonas or pseudomonas aeruginosa for at least 10 minutes, and taking supernatant to obtain a crude enzyme solution;
(2) extracting lipase liquid: putting 3mL of phosphate buffer solution with the concentration of 0.0667 mol.L < -1 > and 1mL of oleic acid into a conical flask, uniformly mixing, putting the mixture into a constant-temperature water bath kettle at 37 ℃ for preheating for at least 5min, then adding the crude enzyme solution extracted in the step (1), stirring for reacting for 10min, immediately adding 8mL of toluene (analytically pure), and continuing to stir for reacting for 2min, and then stopping the reaction; centrifuging the solution obtained by the steps at 3000r/min for at least 10min, and taking the upper organic mixed solution as lipase solution; when the lipase liquid is extracted, the amounts of the phosphate buffer solution, oleic acid and toluene are adjusted in proportion to the amount of the crude enzyme liquid to be extracted (estimated from the amount of the liquid of Pseudomonas fluorescens or Pseudomonas aeruginosa).
In this embodiment:
the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent;
the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent;
the content of alumina in the polyaluminium chloride is more than or equal to 30 percent;
the particle size of the sepiolite powder is 150 meshes, and the content of the sepiolite component in the sepiolite powder is more than or equal to 55 percent;
the particle size of the medical stone powder is 120 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent;
the particle size of the zeolite powder is 120 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent;
the content of the chitosan is more than or equal to 99 percent, and the degree of deacetylation is more than 90 percent.
In this embodiment, the preparation method of the adsorbent composition includes the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 7.0, and then placing the mixture at about 25 ℃ and stirring for 1.5 h;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for 45min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
Example two
In the adsorbent composition for removing heavy metal ions from industrial wastewater in this embodiment, the raw materials of the adsorbent composition include the following components: 23 parts of nano ferroferric oxide, 42 parts of lipase liquid, 8 parts of sodium humate, 12 parts of medical stone powder, 11 parts of sodium carboxymethyl starch, 12 parts of polyaluminium chloride, 5 parts of chitosan, 8 parts of sepiolite powder and 5 parts of zeolite powder.
In the embodiment, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa according to the mass ratio of 3: 2; among them, the culture method of Pseudomonas fluorescens and Pseudomonas aeruginosa and the extraction method of lipase liquid thereof were the same as in the first example.
In this embodiment:
the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent;
the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent;
the content of alumina in the polyaluminium chloride is more than or equal to 30 percent;
the particle size of the sepiolite powder is 200 meshes, and the content of the sepiolite component in the sepiolite powder is more than or equal to 55 percent;
the particle size of the medical stone powder is 100 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent;
the particle size of the zeolite powder is 100 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent;
the content of the chitosan is more than or equal to 99 percent, and the degree of deacetylation is more than 90 percent.
In this embodiment, the preparation method of the adsorbent composition includes the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 6.0, and then stirring the mixture for 1.5 hours at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for 45min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
EXAMPLE III
In the adsorbent composition for removing heavy metal ions from industrial wastewater in this embodiment, the raw materials of the adsorbent composition include the following components: 23 parts of nano ferroferric oxide, 37 parts of lipase liquid, 8 parts of sodium humate, 10 parts of medical stone powder, 11 parts of sodium carboxymethyl starch, 10 parts of polyaluminium chloride, 5 parts of chitosan, 5 parts of sepiolite powder and 5 parts of zeolite powder.
In the embodiment, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa according to the mass ratio of 3: 2; among them, the culture method of Pseudomonas fluorescens and Pseudomonas aeruginosa and the extraction method of lipase liquid thereof were the same as in the first example.
In this embodiment:
the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent;
the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent;
the content of alumina in the polyaluminium chloride is more than or equal to 30 percent;
the particle size of the sepiolite powder is 200 meshes, and the content of the sepiolite component in the sepiolite powder is more than or equal to 55 percent;
the particle size of the medical stone powder is 120 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent;
the particle size of the zeolite powder is 120 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent;
the content of the chitosan is more than or equal to 99 percent, and the degree of deacetylation is more than 90 percent.
In this embodiment, the preparation method of the adsorbent composition includes the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 7.0, and then stirring the mixture for 1 hour at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for 30min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
Example four
In the adsorbent composition for removing heavy metal ions from industrial wastewater in this embodiment, the raw materials of the adsorbent composition include the following components: 28 parts of nano ferroferric oxide, 37 parts of lipase liquid, 12 parts of sodium humate, 10 parts of medical stone powder, 13 parts of sodium carboxymethyl starch, 10 parts of polyaluminium chloride, 8 parts of chitosan, 5 parts of sepiolite powder and 8 parts of zeolite powder.
In the embodiment, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa according to the mass ratio of 3: 2; among them, the culture method of Pseudomonas fluorescens and Pseudomonas aeruginosa and the extraction method of lipase liquid thereof were the same as in the first example.
In this embodiment:
the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent;
the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent;
the content of alumina in the polyaluminium chloride is more than or equal to 30 percent;
the particle size of the sepiolite powder is 150 meshes, and the content of the sepiolite component in the sepiolite powder is more than or equal to 55 percent;
the particle size of the medical stone powder is 100 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent;
the particle size of the zeolite powder is 100 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent;
the content of the chitosan is more than or equal to 99 percent, and the degree of deacetylation is more than 90 percent.
In this embodiment, the preparation method of the adsorbent composition includes the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 6.5, and then stirring the mixture for 2 hours at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for 45min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
EXAMPLE five
In the adsorbent composition for removing heavy metal ions from industrial wastewater in this embodiment, the raw materials of the adsorbent composition include the following components: 28 parts of nano ferroferric oxide, 42 parts of lipase liquid, 12 parts of sodium humate, 12 parts of medical stone powder, 13 parts of sodium carboxymethyl starch, 12 parts of polyaluminium chloride, 8 parts of chitosan, 8 parts of sepiolite powder and 8 parts of zeolite powder.
In the embodiment, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa according to the mass ratio of 3: 2; among them, the culture method of Pseudomonas fluorescens and Pseudomonas aeruginosa and the extraction method of lipase liquid thereof were the same as in the first example.
In this embodiment:
the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent;
the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent;
the content of alumina in the polyaluminium chloride is more than or equal to 30 percent;
the particle size of the sepiolite powder is 150 meshes, and the content of the sepiolite component in the sepiolite powder is more than or equal to 55 percent;
the particle size of the medical stone powder is 120 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent;
the particle size of the zeolite powder is 120 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent;
the content of the chitosan is more than or equal to 99 percent, and the degree of deacetylation is more than 90 percent.
In this embodiment, the preparation method of the adsorbent composition includes the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 6.0, and then stirring the mixture for 2 hours at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for 60min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
EXAMPLE six
In the adsorbent composition for removing heavy metal ions from industrial wastewater in this embodiment, the raw materials of the adsorbent composition include the following components: 28 parts of nano ferroferric oxide, 42 parts of lipase liquid, 8 parts of sodium humate, 12 parts of medical stone powder, 12 parts of sodium carboxymethyl starch, 10 parts of polyaluminium chloride, 5 parts of chitosan, 5 parts of sepiolite powder and 8 parts of zeolite powder.
In the embodiment, the lipase liquid is prepared by mixing lipase liquid secreted by pseudomonas fluorescens and lipase liquid secreted by pseudomonas aeruginosa according to the mass ratio of 3: 2; among them, the culture method of Pseudomonas fluorescens and Pseudomonas aeruginosa and the extraction method of lipase liquid thereof were the same as in the first example.
In this embodiment:
the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent;
the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent;
the content of alumina in the polyaluminium chloride is more than or equal to 30 percent;
the particle size of the sepiolite powder is 180 meshes, and the content of the sepiolite component in the sepiolite powder is more than or equal to 55 percent;
the particle size of the medical stone powder is 100 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent;
the particle size of the zeolite powder is 120 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent;
the content of the chitosan is more than or equal to 99 percent, and the degree of deacetylation is more than 90 percent.
In this embodiment, the preparation method of the adsorbent composition includes the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 6.5, and then stirring the mixture for 2 hours at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for 45min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
In the above examples, the raw materials were all available on the market.
The adsorbent prepared in the first to sixth examples is used for adsorbing certain test wastewater:
1. the processing method comprises the following steps: putting an adsorbent into the wastewater, wherein the ratio of the adsorbent to the wastewater is 5 g: 1L; adjusting the pH value of the wastewater to be 6.0-7.0, and carrying out adsorption treatment at the rotation speed of 220-250rpm for at least 3 hours at about 25 ℃.
2. And (3) testing the adsorption effect: the concentrations of the main heavy metal ions in the electroplating wastewater before and after the adsorption treatment are respectively tested, and the results are shown in the following table:
as can be seen from the above table, the adsorbent composition prepared by the invention has strong adsorption removal capacity on heavy metals, can achieve very high removal rate, and can increase the dosage of the adsorbent according to actual requirements if better adsorption removal is required on wastewater.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. An adsorbent composition for removing heavy metal ions in industrial wastewater, which is characterized in that: the raw materials of the adsorbent composition comprise the following components: 23-28 parts of nano ferroferric oxide, 37-42 parts of lipase liquid, 8-12 parts of sodium humate, 10-12 parts of medical stone powder, 11-13 parts of sodium carboxymethyl starch, 10-12 parts of polyaluminium chloride, 5-8 parts of chitosan, 5-8 parts of sepiolite powder and 5-8 parts of zeolite powder;
the lipase liquid is prepared by mixing lipase liquid generated by the secretion of pseudomonas fluorescens and lipase liquid generated by the secretion of pseudomonas aeruginosa; mixing lipase liquid produced by the secretion of pseudomonas fluorescens and lipase liquid produced by the secretion of pseudomonas aeruginosa according to the mass ratio of 3: 2.
2. The adsorbent composition for removing heavy metal ions in industrial wastewater according to claim 1, characterized in that: the raw materials of the adsorbent composition comprise the following components: 25 parts of nano ferroferric oxide, 39 parts of lipase liquid, 10 parts of sodium humate, 11 parts of medical stone powder, 12 parts of sodium carboxymethyl starch, 11 parts of polyaluminium chloride, 6 parts of chitosan, 7 parts of sepiolite powder and 6 parts of zeolite powder.
3. The adsorbent composition for removing heavy metal ions in industrial wastewater according to claim 1 or 2, characterized in that: the content of humic acid dry basis in the sodium humate is more than or equal to 55 percent; the content of effective substances in the sodium carboxymethyl starch is more than or equal to 99 percent; the content of alumina in the polyaluminium chloride is more than or equal to 30 percent.
4. The adsorbent composition for removing heavy metal ions in industrial wastewater according to claim 1 or 2, characterized in that: the particle size of the sepiolite powder is 150-200 meshes, and the content of the sepiolite component in the sepiolite powder is not less than 55%.
5. The adsorbent composition for removing heavy metal ions in industrial wastewater according to claim 1 or 2, characterized in that: the particle size of the medical stone powder is 100-120 meshes, and the content of silicon dioxide in the medical stone powder is more than or equal to 60 percent.
6. The adsorbent composition for removing heavy metal ions in industrial wastewater according to claim 1 or 2, characterized in that: the particle size of the zeolite powder is 100-120 meshes, and the content of silicon dioxide in the zeolite powder is more than or equal to 60 percent.
7. The adsorbent composition for removing heavy metal ions in industrial wastewater according to claim 1 or 2, characterized in that: the content of the chitosan is more than or equal to 99 percent, and the degree of deacetylation is more than 90 percent.
8. The adsorbent composition for removing heavy metal ions in industrial wastewater according to claim 1 or 2, characterized in that:
the preparation method of the adsorbent composition comprises the following steps:
(1) mixing nano ferroferric oxide with lipase liquid, adjusting the pH of the mixture to 6.0-7.0, and then stirring the mixture for at least 1h at about 25 ℃;
(2) and (2) adding sodium humate and chitosan into the mixture obtained in the step (1), continuously stirring for at least 30min, then adding zeolite powder, sodium carboxymethyl starch, polyaluminium chloride, sepiolite powder and medical stone powder, and uniformly mixing.
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