CN113149164A - Leather-making preparation section wastewater treatment agent and preparation method and application thereof - Google Patents
Leather-making preparation section wastewater treatment agent and preparation method and application thereof Download PDFInfo
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- CN113149164A CN113149164A CN202110262086.5A CN202110262086A CN113149164A CN 113149164 A CN113149164 A CN 113149164A CN 202110262086 A CN202110262086 A CN 202110262086A CN 113149164 A CN113149164 A CN 113149164A
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- wastewater treatment
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- wastewater
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- tannery
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/22—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof
- C02F2103/24—Nature of the water, waste water, sewage or sludge to be treated from the processing of animals, e.g. poultry, fish, or parts thereof from tanneries
Abstract
The invention relates to the technical field of tannery wastewater treatment, in particular to a wastewater treatment agent for a tannery preparation workshop section, and a preparation method and application thereof. The leather-making preparation section wastewater treatment agent comprises the following components in parts by weight: 60-80 parts of a reactive reagent and 10-30 parts of an auxiliary agent; the reactive reagent comprises any one or more of polyethyleneimine, chitosan and cationic guar gum; the auxiliary agent comprises activated carbon and/or bentonite. According to the invention, a cation reactive reagent, such as polyethyleneimine, chitosan, cation guar gum and the like, is combined with an anion group of a pollutant in the wastewater of a tanning preparation workshop section, so that the hydrophilicity of the pollutant is reduced, and the pollutant in the wastewater is precipitated; the auxiliary agent removes a small amount of micromolecular chemical materials in the wastewater of the preparation workshop section through the electrostatic action, thereby realizing the recycling of the wastewater of the tanning workshop section.
Description
Technical Field
The invention relates to the technical field of tannery wastewater treatment, in particular to a wastewater treatment agent for a tannery preparation workshop section, and a preparation method and application thereof.
Background
The leather industry is a distinctive and dominant industry in China and occupies an indispensable position in national economy. The traditional tanning process consists of 28-32 chemical unit operations and 10-15 physical mechanical unit operations. The whole leather-making process can be divided into four process steps of a preparation section, a tanning section, a wet finishing section and a dry finishing section according to the purpose of unit operation. The main purpose of the preparation section is to remove non-collagen components such as epidermis, hair, grease, water-soluble protein and the like, and to properly disperse collagen fibers, about 45 tons of water and 350kg of chemical materials are consumed for processing 1 ton of raw material skin, most of the chemical materials are not combined with the skin collagen, and the wastewater water volume of the preparation section is large and the COD concentration is high and is about 3000-20000 mg/L along with the discharge of the wastewater.
The organic matters in the wastewater of the preparation workshop section mainly comprise natural oil and collagen hydrolysate, chemical materials (such as surfactant and the like) and the like. The waste water of the preparation workshop section is in an emulsion state, is opaque, and has large molecular weight of organic matters, wherein the organic matters exist in a colloid state of about 80 percent and a dissolved state of about 20 percent. The treatment modes of different components in the wastewater are different, and the conventional wastewater treatment agent cannot effectively treat the wastewater generated in the tanning preparation workshop section efficiently, so that a large amount of wastewater in the preparation workshop section cannot be recycled, and the environment is greatly polluted.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a leather-making preparation workshop section wastewater treatment agent to solve the technical problem that the wastewater of the leather-making preparation workshop section cannot be effectively treated in the prior art.
The second purpose of the invention is to provide a preparation method of the leather-making preparation workshop section wastewater treatment agent, which is simple and convenient and has mild conditions.
The third purpose of the invention is to provide the application of the wastewater treatment agent in the treatment of the wastewater of the tanning preparation workshop section.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the leather-making preparation section wastewater treatment agent comprises the following components in parts by weight:
60-80 parts of a reactive reagent and 10-30 parts of an auxiliary agent;
the reactive reagent comprises any one or more of polyethyleneimine, chitosan and cationic guar gum;
the auxiliary agent comprises activated carbon and/or bentonite.
According to the invention, a specific cation reactive reagent, such as polyethyleneimine, chitosan, cation guar gum and the like, is combined with an anionic group of a pollutant in the wastewater of a tanning preparation workshop section, so that the hydrophilicity of the pollutant is reduced, and the pollutant in the wastewater is precipitated; the auxiliary agent in the treating agent removes a small amount of micromolecular chemical materials in the wastewater of the preparation working section through electrostatic interaction.
In a specific embodiment of the invention, the molecular weight of the reactive agent is 2000-500000.
In a preferred embodiment of the invention, the adjuvant comprises activated carbon and bentonite. Further, the auxiliary agent comprises 50-90% of activated carbon and 10-50% of bentonite by mass percent.
In a preferred embodiment of the invention, the auxiliary agent comprises 70-80% of activated carbon and 20-30% of bentonite by mass percentage. More preferably, the auxiliary agent comprises 75% of activated carbon and 25% of bentonite by mass percentage.
In a preferred embodiment of the invention, the flocculant also comprises 5-15 parts by weight of flocculant.
In a particular embodiment of the invention, the flocculating agent comprises any one or more of polyaluminium chloride, polyaluminium sulphate, polyferric sulphate and polyaluminium-ferric sulphate.
In a specific embodiment of the present invention, the wastewater treatment agent is a liquid formulation.
The liquid preparation comprises active ingredients and water, wherein the active ingredients comprise a reactive reagent and an auxiliary agent, or the active ingredients comprise a reactive reagent, an auxiliary agent and a flocculating agent. Wherein, in the liquid preparation, the mass fraction of the active ingredients is 5-15%, preferably 8-12%, and more preferably 10%.
The invention also provides a preparation method of the leather-making preparation workshop section wastewater treatment agent, which comprises the following steps:
the components are mixed evenly according to the proportion.
Further, the components are uniformly mixed according to a proportion and then are mixed with water to prepare a liquid preparation.
The invention also provides application of any one of the leather-making preparation workshop section wastewater treatment agents in treatment of leather-making preparation workshop section wastewater.
Aiming at the problems of large wastewater amount, complex components, high organic matter concentration, high water taking cost of a tannery and the like in the conventional tanning preparation workshop section, a high-efficiency and low-cost treatment method is provided, and the reuse of the wastewater is realized. The wastewater treatment agent provided by the invention can be used for treating the wastewater in the tanning preparation workshop section in a targeted manner according to the specific conditions of components in the wastewater, and has high COD (chemical oxygen demand) removal efficiency and high solidification removal efficiency.
In a specific embodiment of the present invention, the method of processing comprises:
(a) mixing the wastewater of the leather-making preparation workshop section with the wastewater treatment agent, and reacting for 15-60 min under the stirring action;
(b) and (b) carrying out solid-liquid separation on the material after the reaction in the step (a).
In the step (a), after mixing, under the stirring action, the treating agent and organic matters in the wastewater have the functions of combining, aggregating, adsorbing and the like, so that pollutants are changed into water-insoluble particles and the like.
In a specific embodiment of the present invention, the solid-liquid separation is performed by centrifugal separation or filtration separation.
In practice, continuous through-type centrifugation can be carried out using a centrifuge. Further, the rotation speed of the centrifugation is 2500-3500 rpm, preferably 2800-3200 rpm, and more preferably 3000 rpm.
In actual operation, the filtration separation can be performed by using a plate-and-frame pressure filter and/or a boiling bed separator.
In actual operation, the wastewater treatment agent is added in the form of a liquid preparation to ensure the stability of the treatment effect.
In a preferred embodiment of the present invention, the amount of the wastewater treatment agent added is 0.2 to 1kg per ton of wastewater.
In the specific embodiment of the invention, in the tannery preparation workshop section wastewater, the COD concentration is not higher than 20000mg/L, such as 3000-20000 mg/L; the concentration of SS is not higher than 5000mg/L, such as 500-5000 mg/L.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, a specific cation reactive reagent, such as polyethyleneimine, chitosan, cation guar gum and the like, is combined with an anionic group of a pollutant in the wastewater of a tanning preparation workshop section, so that the hydrophilicity of the pollutant is reduced, and the pollutant in the wastewater is precipitated; the auxiliary agent removes a small amount of micromolecular chemical materials in the wastewater of the preparation working section through electrostatic interaction;
(2) the wastewater treatment agent disclosed by the invention is simple in preparation method and low in cost;
(3) the invention provides a high-efficiency and low-cost treatment method for solving the problems of large wastewater amount, complex components, high organic matter concentration, high water taking cost of a tannery and the like in the conventional tanning preparation workshop section, and realizes the recycling of the wastewater in the tanning workshop section.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following detailed description, but those skilled in the art will understand that the following described examples are some, not all, of the examples of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The leather-making preparation section wastewater treatment agent comprises the following components in parts by weight:
60-80 parts of a reactive reagent and 10-30 parts of an auxiliary agent;
the reactive reagent comprises any one or more of polyethyleneimine, chitosan and cationic guar gum;
the auxiliary agent comprises activated carbon and/or bentonite.
According to the invention, a specific cation reactive reagent, such as polyethyleneimine, chitosan, cation guar gum and the like, is combined with an anionic group of a pollutant in the wastewater of a tanning preparation workshop section, so that the hydrophilicity of the pollutant is reduced, and the pollutant in the wastewater is precipitated; the auxiliary agent in the treating agent removes a small amount of micromolecular chemical materials in the wastewater of the preparation working section through electrostatic interaction.
As in various embodiments, the reactive agent may be used in amounts of 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, and the like; the auxiliaries can be used in amounts of 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, and the like.
In a specific embodiment of the invention, the molecular weight of the reactive agent is 2000-500000.
In a preferred embodiment of the invention, the adjuvant comprises activated carbon and bentonite. Further, the auxiliary agent comprises 50-90% of activated carbon and 10-50% of bentonite by mass percent.
In a preferred embodiment of the invention, the auxiliary agent comprises 70-80% of activated carbon and 20-30% of bentonite by mass percentage. More preferably, the auxiliary agent comprises 75% of activated carbon and 25% of bentonite by mass percentage.
By adopting the auxiliary agent with the proportion, the removal effect of the micromolecule chemical materials in the wastewater can be further improved.
In a preferred embodiment of the invention, the flocculant also comprises 5-15 parts by weight of flocculant.
As in various embodiments, the flocculant may be used in an amount of 5 parts, 8 parts, 10 parts, 12 parts, 15 parts, and the like.
Since the organic matter in the waste water of the preparation section is mostly in the form of macromolecules, the flocculating agent does not have to be added. But after the flocculating agent is added, the organic matter particles with reduced hydrophilicity can be enlarged, so that the sedimentation is facilitated, and the removal rate and the removal efficiency are further improved.
In a particular embodiment of the invention, the flocculating agent comprises any one or more of polyaluminium chloride, polyaluminium sulphate, polyferric sulphate and polyaluminium-ferric sulphate.
In a specific embodiment of the present invention, the wastewater treatment agent is a liquid formulation.
The liquid preparation comprises active ingredients and water, wherein the active ingredients comprise a reactive reagent and an auxiliary agent, or the active ingredients comprise a reactive reagent, an auxiliary agent and a flocculating agent. Wherein, in the liquid preparation, the mass fraction of the active ingredients is 5-15%, preferably 8-12%, and more preferably 10%.
The invention also provides a preparation method of the leather-making preparation workshop section wastewater treatment agent, which comprises the following steps:
the components are mixed evenly according to the proportion.
Further, the components are uniformly mixed according to a proportion and then are mixed with water to prepare a liquid preparation.
The invention also provides application of any one of the leather-making preparation workshop section wastewater treatment agents in treatment of leather-making preparation workshop section wastewater.
Aiming at the problems of large wastewater amount, complex components, high organic matter concentration, high water taking cost of a tannery and the like in the conventional tanning preparation workshop section, a high-efficiency and low-cost treatment method is provided, and the reuse of the wastewater is realized. The wastewater treatment agent provided by the invention can be used for treating the wastewater in the tanning preparation workshop section in a targeted manner according to the specific conditions of components in the wastewater, and has high COD (chemical oxygen demand) removal efficiency and high solidification removal efficiency.
In a specific embodiment of the present invention, the method of processing comprises:
(a) mixing the wastewater of the leather-making preparation workshop section with the wastewater treatment agent, and reacting for 15-60 min under the stirring action;
(b) and (b) carrying out solid-liquid separation on the material after the reaction in the step (a).
Through the treatment of the invention, the COD value and the SS value in the liquid after solid-liquid separation are greatly reduced, the recycling standard can be reached, the discharge of waste water is greatly reduced, the pollution to the environment is reduced, and simultaneously, the resource utilization rate is improved.
In the step (a), after mixing, under the stirring action, the treating agent and organic matters in the wastewater have the functions of combining, aggregating, adsorbing and the like, so that pollutants are changed into water-insoluble particles and the like.
In a specific embodiment of the present invention, the solid-liquid separation is performed by centrifugal separation or filtration separation.
In practice, continuous through-type centrifugation can be carried out using a centrifuge. Further, the rotation speed of the centrifugation is 2500-3500 rpm, preferably 2800-3200 rpm, and more preferably 3000 rpm.
In actual operation, the filtration separation can be performed by using a plate-and-frame pressure filter and/or a boiling bed separator.
In actual operation, the wastewater treatment agent is added in the form of a liquid preparation to ensure the stability of the treatment effect.
In a preferred embodiment of the present invention, the amount of the wastewater treatment agent added is 0.2 to 1kg per ton of wastewater.
In the specific embodiment of the invention, in the tannery preparation workshop section wastewater, the COD concentration is not higher than 20000mg/L, such as 3000-20000 mg/L; the concentration of SS is not higher than 5000mg/L, such as 500-5000 mg/L.
By adopting the wastewater treatment agent to treat the wastewater of the tanning preparation workshop section within the condition range, the COD removal efficiency in the wastewater of the tanning preparation workshop section can reach more than 70 percent, and the curing removal efficiency can reach more than 90 percent.
In the following embodiments, the types of reagents used may be as follows:
polyethyleneimine, wherein the molecular weight of the polyethyleneimine is 3000-40000, and the molecular weight is obtained from Meigu chemical Co., Ltd;
the cationic guar gum has the molecular weight of 50000-200000, and is prepared from Shandong Helmingtung new materials, Inc.;
chitosan with molecular weight of 100000-500000, Weifang Hai Yuan biological products Limited;
polyaluminum chloride, Jingjiang water purification materials, Inc., of sclerite, Inc.;
polyferric sulfate, Inc., of Jinjiang water purification materials, Inc., of Jiangyi City;
polymeric aluminum ferric sulfate, firm, Jinjiang water purification materials, Inc.;
activated carbon, jingjiang water purification materials ltd, consolidation city;
bentonite, Xinyang Xinyu Bentonite sales Limited.
Example 1
The embodiment provides a leather-making preparation workshop section wastewater treatment agent which comprises the following components in parts by weight:
70 parts of polyethyleneimine, 10 parts of polyaluminum chloride, 15 parts of activated carbon and 5 parts of bentonite, and 900 parts of water.
The preparation method of the leather-making preparation workshop section wastewater treatment agent comprises the following steps:
the components are weighed according to the proportion and are uniformly mixed to obtain the wastewater treatment agent.
Examples 2 to 8
The kinds and amounts of the components of the leather preparation section wastewater treatment agents of examples 2 to 8 are shown in Table 1.
TABLE 1 types and amounts of components of wastewater treatment agents in tanning preparation section of various examples
Examples 2 to 8 were made with reference to the method of example 1.
Examples 9 to 16
The embodiment provides a method for treating wastewater of a tanning preparation workshop section by using a wastewater treatment agent, which comprises the following steps of:
(1) taking 1000 parts of waste water of a leather-making preparation workshop section, adding a certain amount of waste water treatment agent, and stirring and reacting for 30min at room temperature to obtain a reacted solution;
(2) and (3) continuously passing through the solution obtained in the step (1) by adopting a centrifugal machine at the rotating speed of 3000rpm, separating solid from liquid, and collecting supernatant for recycling.
The types and the amounts of the wastewater treatment agents used in the leather-making preparation section in each example are shown in Table 2.
TABLE 2 types and amounts of wastewater treatment agents in various examples
| Numbering | Kinds of wastewater treatment agents | Amount of wastewater treatment agent |
| Example 9 | Example 1 | 10 portions of |
| Example 10 | Example 2 | 10 portions of |
| Example 11 | Example 3 | 10 portions of |
| Example 12 | Example 4 | 10 portions of |
| Example 13 | Example 5 | 10 portions of |
| Example 14 | Example 6 | 10 portions of |
| Example 15 | Example 7 | 10 portions of |
| Example 16 | Example 8 | 10 portions of |
Comparative example 1
Comparative example 1 reference is made to example 9 for a process for treating tannery preparation section wastewater except that the wastewater treatment agent is different.
The wastewater treatment agent of comparative example 1 comprises the following components in parts by weight: 70 parts of polyethyleneimine and 10 parts of polyaluminum chloride, and 720 parts of water.
Comparative example 2
Comparative example 2 the process for treating tannery preparation section wastewater of example 9 was referenced, except that the wastewater treatment agent was different.
The wastewater treatment agent of comparative example 2 comprises the following components in parts by weight: 70 parts of polyethyleneimine, and 630 parts of water.
Comparative example 3
Comparative example 3 the process for treating tannery preparation section wastewater of example 9 was referenced, except that the wastewater treatment agent was different.
The wastewater treatment agent of comparative example 3 comprises the following components in parts by weight: 40 parts of polyethyleneimine, 40 parts of polyaluminum chloride, 15 parts of activated carbon and 5 parts of bentonite, and 900 parts of water.
Examples of the experiments
In order to comparatively illustrate the difference in the components of the supernatants obtained after the wastewater treatment in the examples and comparative examples of the present invention, the treated water (collected supernatants) in the examples and comparative examples was examined, and the results are shown in Table 3.
TABLE 3 Water quality test results after different waste water treatments
| Numbering | COD(mg/L) | SS(mg/L) |
| Before treatment | 8950 | 2900 |
| Example 9 | 1060 | 170 |
| Example 10 | 1270 | 190 |
| Example 11 | 1690 | 185 |
| Example 12 | 1545 | 210 |
| Example 13 | 1460 | 205 |
| Example 14 | 940 | 145 |
| Example 15 | 1150 | 185 |
| Example 16 | 1030 | 160 |
| Comparative example 1 | 3580 | 440 |
| Comparative example 2 | 4230 | 475 |
| Comparative example 3 | 3290 | 370 |
Wherein, COD is determined according to the chemical oxygen demand of the national standard GB11914-89, and SS is determined according to the gravimetric method standard of the determination of the national standard GB11901-1989 water suspended matters.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The leather-making preparation section wastewater treatment agent is characterized by comprising the following components in parts by weight:
60-80 parts of a reactive reagent and 10-30 parts of an auxiliary agent;
the reactive reagent comprises any one or more of polyethyleneimine, chitosan and cationic guar gum;
the auxiliary agent comprises activated carbon and/or bentonite.
2. The tannery preparation section wastewater treatment agent according to claim 1, wherein the reactive agent has a molecular weight of 2000 to 500000.
3. The leather-making preparation section wastewater treatment agent as claimed in claim 1, wherein the auxiliary agent comprises 50-90% of activated carbon and 10-50% of bentonite by mass percent;
preferably, the auxiliary agent comprises 70-80% of activated carbon and 20-30% of bentonite by mass percent;
more preferably, the auxiliary agent comprises 75% of activated carbon and 25% of bentonite by mass percentage.
4. The tannery preparation section wastewater treatment agent according to any one of claims 1 to 3, further comprising 5 to 15 parts by weight of a flocculant.
5. The tannery preparation section wastewater treatment agent according to claim 4, wherein the flocculant comprises any one or more of polyaluminium chloride, polyaluminium sulphate, polyferric sulphate and polyaluminium ferric sulphate.
6. The tannery preparation section wastewater treatment agent according to claim 1, wherein the wastewater treatment agent is a liquid formulation;
preferably, in the liquid preparation, the total mass fraction of the reactive reagent and the auxiliary agent is 5-15%.
7. The process for preparing a tannery preparation section wastewater treatment agent according to any one of claims 1 to 6, comprising the steps of: mixing the components uniformly according to a proportion;
preferably, the components are uniformly mixed according to the proportion and then are mixed with water to prepare the liquid preparation.
8. Use of a tannery preparation section wastewater treatment agent according to any one of claims 1 to 6 in the treatment of tannery preparation section wastewater, characterised in that the method of treatment comprises:
(a) mixing the wastewater of the leather-making preparation workshop section with the wastewater treatment agent, and reacting for 15-60 min under the stirring action;
(b) and (b) carrying out solid-liquid separation on the material after the reaction in the step (a).
9. The use according to claim 8, wherein the wastewater treatment agent is added in an amount of 0.2 to 1 kg/ton of wastewater.
10. The use according to claim 8, characterized in that in the tannery preparation section wastewater, the COD concentration is not higher than 20000 mg/L; the SS concentration is not higher than 5000 mg/L.
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Citations (4)
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|---|---|---|---|---|
| CN103880221A (en) * | 2014-04-15 | 2014-06-25 | 中国皮革和制鞋工业研究院 | Process for treating and recycling wet finishing mixing wastewater in leather production |
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| CN109179531A (en) * | 2018-10-30 | 2019-01-11 | 薛燕 | A kind of sewage-treating agent and preparation method thereof |
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2021
- 2021-03-10 CN CN202110262086.5A patent/CN113149164B/en active Active
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|---|---|---|---|---|
| CN103880221A (en) * | 2014-04-15 | 2014-06-25 | 中国皮革和制鞋工业研究院 | Process for treating and recycling wet finishing mixing wastewater in leather production |
| CN107552014A (en) * | 2017-10-30 | 2018-01-09 | 陈云 | A kind of Universal Dye waste water treating agent |
| CN109179531A (en) * | 2018-10-30 | 2019-01-11 | 薛燕 | A kind of sewage-treating agent and preparation method thereof |
| CN109336238A (en) * | 2018-12-17 | 2019-02-15 | 方期洲 | A kind of flocculant and its application for treatment of dyeing wastewater |
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| Title |
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| 孟凡秋等: "聚乙烯亚胺-膨润土复合材料对橙黄Ⅱ的吸附性能研究", 《济南大学学报(自然科学版)》 * |
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