CN102351335A - Method for processing electroplating wastewater with organic functional fibers - Google Patents
Method for processing electroplating wastewater with organic functional fibers Download PDFInfo
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- CN102351335A CN102351335A CN2011101855874A CN201110185587A CN102351335A CN 102351335 A CN102351335 A CN 102351335A CN 2011101855874 A CN2011101855874 A CN 2011101855874A CN 201110185587 A CN201110185587 A CN 201110185587A CN 102351335 A CN102351335 A CN 102351335A
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Abstract
The invention discloses a method for processing electroplating wastewater with organic functional fibers, belonging to the technical field of industrial waste water processing, comprising the following steps: at room temperature, filtering mechanical impurities from the electroplating wastewater through a pre-filter unit, letting the electroplating wastewater fully contact with an adsorption bed filled with organic functional fibers from bottom to top to remove heavy metal ions from the electroplating wastewater, so as to get effluent which reaches the direct discharge standard; carrying out the desorption on the saturated organic functional fibers with diluted acid or sigwater, and washing with water until neutrality, so that the processed organic functional fibers are recycled for the adsorption of electroplating wastewater, and the highly condensed eluent is used for recovering heavy metal ions. The method has the advantages of simple process flow, convenient operation, stable effects, small investment, recycled fibers and the like, can be used for purifying the electroplating wastewater containing copper, nickel, zinc, chromium and other single or multiple heavy metal ions, and the processed effluent reaches the discharge standard of electroplating pollutants.
Description
Technical field
The present invention relates to a kind of electroplating wastewater processing novel method, relate in particular to the method that adopts the organic functions fiber that the electroplating wastewater that contains single or contents of many kinds of heavy metal ion is handled, belong to the technology for treating industrial waste water field.
Background technology
Plating is one of the world today's three big contaminated industries, is promptly classified as one of 25 kinds of industries that limit development by the Chinese government in 1994.Therefore, electroplate the boundary when constantly opening up novel cleaning procedure, make great efforts to be devoted to electroplating wastewater and administer Study on Technology.Electroplating wastewater has characteristics such as water quality complicacy, strong toxicity, blowdown flow rate are big, and principal pollutant are heavy metal ion, and in a single day it get into environment, must produce extensive and serious harm to ecotope and human society.Therefore, carry out the research of efficient electroplating wastewater treating technology, have very important realistic meaning.
The conventional treatment method of electroplating wastewater comprises chemical precipitation method, electrolytic process, membrane separation process, biochemical process, ion-exchange and absorption method etc.Shortcomings such as wherein, chemical precipitation method ubiquity reagent consumption is many, processing costs is high, heavy metal sewage sludge is many; Electrolytic process generally is used for the higher and single electroplating wastewater of concentration, and consumes electric power and iron material, produces a large amount of mud simultaneously; The membrane separation process device is simple, processing ease, and separation efficiency is high, but investment is big, and working cost is high, and the life-span of film is short, is mainly used in to reclaim the high material of added value; Biochemical process has the low characteristics of working cost, but its treatment time is longer, and the highly toxic substance that contains in the waste water can the severe inhibition microbic activity.
The organic functions fiber is a kind of novel ion-exchange with multiple functional group and sorbing material; Its matrix has polyvinyl alcohol, polyacrylonitrile, polycaproamide, polyolefine etc.; Wherein the cyanic acid on polyacrylonitrile (PAN) fiber has very strong activity; Can make a series of modified acrylic fibres through the chemical reaction of cyanic acid, like the polyacrylonitrile fibre of carboxylic polyacrylonitrile fibre, amino-contained.When the organic functions fiber is used for wastewater treatment, have high adsorption capacity, rate of adsorption is fast; Advantages such as type of service is flexible, and the adsorption column pressure-losses is little are when realizing wastewater treatment; Can obtain the high elutriant of cycles of concentration, thereby help the resource utilization of useful matter to reclaim.
Adopt organic functions fiber electroplating wastewater single to cupric, nickel, zinc or chromium or contents of many kinds of heavy metal ion to handle at present, do not see the pertinent literature report.
Technical scheme
The object of the invention is to provide a kind of novel method of utilizing organic functions fiber treatment electroplating wastewater with heavy metal ions, water outlet after the processing is satisfied electroplated pollutant emission standard.
For realizing the object of the invention, the present invention adopts and contains carboxylated polypropylene nitrile fiber and amino-contained polyacrylonitrile fibre, and the electroplating wastewater that contains single or contents of many kinds of heavy metal ion is handled.Concrete through the following step realization:
(1) under the room temperature, electroplating wastewater through pre-filtrating equipment filtering mechanical impurity, is fully contacted the heavy metal ion in the absorption removal electroplating wastewater, the direct qualified discharge of water outlet with mode from bottom to top with the adsorption bed of organic functions fiber filling;
(2) the saturated organic functions fiber of absorption is with diluted acid or sig water desorption, wash to neutrality through water; Circulation is used for the adsorption treatment of electroplating wastewater; Highly spissated elutriant is used for the recovery of heavy metal ion, and treat effluent is used for the preparation of following batch desorbing agent.
Contain copper (1-350mg/L), nickel (1-130 mg/L), zinc (1-10 mg/L), chromium single or contents of many kinds of heavy metal ion such as (10-200 mg/L) described in the step (1) in the electroplating wastewater; According to the composition of heavy metal ions in wastewater, the organic functions fiber is selected the polyacrylonitrile fibre (amido content 3.0-6.0 mmol/g) of carboxylic polyacrylonitrile fibre (carboxyl-content 3.0-8.0 mmol/g) and/or amino-contained for use in the step (1).Carboxylic polyacrylonitrile fibre preparation is referring to document " RPFC fiber treatment metal ion electroplating wastewater " (water technology; 2008; 6,66～69), the preparation of the polyacrylonitrile fibre of amino-contained referring to patent " a kind of arsenic adsorbing fiber and synthesis method thereof " (ZL200910065135.5).
Desorption liquid described in the step (2) is the HCl solution of 0.5-1.0mol/L or the NaOH solution of 0.05-1.0 mol/L.
Beneficial effect of the present invention is: it is simple, easy to operate that (1) adopts organic functions fiber treatment electroplating wastewater to have a technical process, effect stability, and less investment, fiber is renewable remarkable advantage such as to recycle; (2) can purify electroplating wastewaters single or contents of many kinds of heavy metal ion such as cupric, nickel, zinc, chromium, treat effluent reaches " plating pollutant emission standard " (GB 21900-2008), directly qualified discharge; (3) saturated available diluted acid in back of fiber absorption or the efficient desorption and regeneration of sig water are realized the repeated use of fiber; When (4) handling electroplating wastewater realization discharged wastewater met the national standard, can obtain the high elutriant of cycles of concentration, help the resource utilization of heavy metal ion to reclaim.
Embodiment
For better the present invention being elaborated, it is following to lift embodiment:
Embodiment 1
Electroplating wastewater with Shenzhen Electroplate Factory is an original solution, and the content that atomic absorption spectrum records copper in the waste water, nickel, zinc is respectively 320mg/L, 127mg/L, 1.9mg/L, and waste water ph is about 3.1.0g is contained after the flushing of adsorption column water, exhaust bubble of carboxylic acid group's polyacrylonitrile fibre (carboxyl-content 3.0-8.0 mmol/g) filling, electroplating wastewater is pumped into the fiber adsorption column from bottom to top with 2～3mL/min flow velocity.Treatment capacity 80mL; The content of handling back water outlet copper, nickel, zinc is respectively 0.074mg/L, 0.490mg/L, 0.014mg/L; Reach the pollutant emission limit of " plating pollutant emission standard " /> (GB 21900-2008) regulation; Be total copper < 0.5 mg/>L; Total nickel < 0.5 mg/>L, total zinc < 1.5 mgL.After fiber absorption is saturated, adopt 12mL diluted acid 0.5mol/L desorption fiber adsorption column from top to bottom, desorption rate is more than 90%, and elutriant is used for the recovery of heavy metal ion.
Embodiment 2
Other adsorption operations condition is with embodiment 1, and electroplating wastewater is replaced by the waste water of laboratory preparation, and copper, nickel, zinc initial content are 100mg/L, and the pH value is 3.The detected result of handling the back water outlet is 0.03mg/L, 0.19mg/L, 0.32mg/L, and desorption rate is more than 90%, the direct qualified discharge of treat effluent or be used for the preparation of following batch desorbing agent.
Embodiment 3
Electroplating wastewater with the Zhengzhou plating shop is an original solution, and atomic absorption spectrum records that total chrome content is 53 mg/l in the waste water, and waste water ph is 8.After the adsorption column water flushing of 1.5 g amino-contained polyacrylonitrile fibres (amido content 3.0-6.0 mmol/g) fillings, exhaust bubble, electroplating wastewater is pumped into the fiber adsorption column from bottom to top with the flow velocity of 5 mL/min.Treatment capacity is that 1.1 L/ criticize, and handles back water outlet total chrome content and is lower than 0.5 mg/L, reaches the pollutant emission limit of " plating pollutant emission standard " /> (GB 21900-2008) regulation, promptly total chromium < 1.0 mgL.After fiber absorption was saturated, adopting 100 mL volumetric molar concentrations was the NaOH solution desorption fiber adsorption column from top to bottom of 0.1 mol/L, and desorption rate is more than 90%, the direct qualified discharge of treat effluent or be used for the preparation of following batch desorbing agent.
Embodiment 4
Other adsorption operations condition is with embodiment 3, and the content of total chromium is increased to 121 mg/L in the electroplating wastewater, and the waste water flow velocity is increased to 10 mL/min.The fiber adsorption column still can be effective to the processing of electroplating wastewater after a plurality of adsorption-regeneration-flushing circulation.For example the 15th round-robin fiber adsorption treatment effect is: treatment capacity 670 mL, handle back water outlet total chrome content and be lower than 0.5 mg/L.This treatment capacity is compared the 1st circulation, only descends about 5%, shows that treatment effect was highly stable when this fiber was recycled and reused for electroplating wastewater processing.After fiber absorption is saturated, adopt the NaOH solution of 0.1 mol/L to carry out desorption and regeneration, desorption rate is more than 90%, and elutriant is used for the recovery of heavy metal ion.
Embodiment 5
Electroplating wastewater adopts the waste water of laboratory preparation; The copper initial content is 96.8mg/L; Adsorption column water flushing with 1.0 g amino-contained polyacrylonitrile fibres (amido content 3.0-6.0 mmol/g) filling; After the exhaust bubble; Electroplating wastewater is pumped into the fiber adsorption column with the flow velocity adverse current of 3 mL/min; Treatment capacity 250mL; Go out water-content 0.013mg/L after the processing; Reach the pollutant emission limit of " plating pollutant emission standard " /> (GB 21900-2008) regulation; Be total copper < 0.5 mgL; After fiber absorption is saturated; Adopt the HCl solution of 0.1 mol/L to carry out desorption and regeneration, desorption rate is more than 90%, and elutriant is used for the recovery of heavy metal ion.
Embodiment 6
Electroplating wastewater adopts the nickel and the chromium composite waste 100mL of laboratory preparation; The nickel starting point concentration is 100mg/L; Chromium starting point concentration 50mg/L; 1.0g is contained carboxylic acid group's polyacrylonitrile fibre (carboxyl-content 3.0-8.0 mmol/g) and 1.0g amino-contained polyacrylonitrile fibre (amido content 3.0-6.0 mmol/g) is packed into adsorption column respectively; With two pillar series connection; The water flushing; After the exhaust bubble; Electroplating wastewater connected with the flow velocity of 3mL/min from bottom to top pump into the fiber adsorption column; Handle back water outlet nickel 0.22mg/L; Chromium 0.35 mg/L; Reach the pollutant emission limit of " plating pollutant emission standard " /> (GB 21900-2008) regulation; Be total nickel < 0.5 mg/>L, total chromium < 1.0 mgL.Adopt the HCl solution of 0.1 mol/L to carry out desorption and regeneration respectively to containing carboxylated polypropylene nitrile fiber pillar; 0.1 the NaOH solution of mol/L carries out desorption and regeneration to amino-contained polyacrylonitrile fibre pillar; Desorption rate all reaches more than 90%, and elutriant is used for the recovery of heavy metal ion.
Claims (4)
1. adopt the method for organic functions fiber treatment electroplating wastewater, it is characterized in that, realize through the following step:
(1) under the room temperature, electroplating wastewater through pre-filtrating equipment filtering mechanical impurity, is fully contacted the heavy metal ion in the absorption removal electroplating wastewater, the direct qualified discharge of water outlet with mode from bottom to top with the adsorption bed of organic functions fiber filling;
(2) the saturated organic functions fiber of absorption is with diluted acid or sig water desorption, wash to neutrality through water, and circulation is used for the adsorption treatment of electroplating wastewater, and highly spissated elutriant is used for the recovery of heavy metal ion;
According to the composition of heavy metal ions in wastewater, the organic functions fiber is selected the polyacrylonitrile fibre of carboxylic polyacrylonitrile fibre and/or amino-contained for use.
2. the method for processing electroplating wastewater as claimed in claim 1 is characterized in that, contains 1-350 mg/L copper, 1-130 mg/L nickel, 1-10mg/L zinc or the single or contents of many kinds of heavy metal ion of 10-200 mg/L chromium in the described electroplating wastewater.
3. the method for processing electroplating wastewater as claimed in claim 1 is characterized in that, carboxylic polyacrylonitrile fibre carboxyl-content is 3.0-8.0 mmol/g; The polyacrylonitrile fibre amido content of amino-contained is 3.0-6.0 mmol/g.
4. the method for processing electroplating wastewater as claimed in claim 1 is characterized in that, used diluted acid is the HCl solution of 0.5-1.0mol/L; Used sig water is the NaOH solution of 0.05-1.0 mol/L.
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| CN2011101855874A CN102351335A (en) | 2011-07-05 | 2011-07-05 | Method for processing electroplating wastewater with organic functional fibers |
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| CN2011101855874A CN102351335A (en) | 2011-07-05 | 2011-07-05 | Method for processing electroplating wastewater with organic functional fibers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108147584A (en) * | 2017-12-31 | 2018-06-12 | 邯郸派瑞电器有限公司 | A kind of method using PAN-PEI amido chelate fibre Treatment of Copper sewage |
| CN114007743A (en) * | 2019-06-20 | 2022-02-01 | 日本爱克兰工业株式会社 | Ion exchange fiber and ion exchange filter containing the same |
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| CN1347761A (en) * | 2001-09-17 | 2002-05-08 | 桂林正翰科技开发有限责任公司 | Method of preparing functional ion exchange fiber |
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| CN108147584A (en) * | 2017-12-31 | 2018-06-12 | 邯郸派瑞电器有限公司 | A kind of method using PAN-PEI amido chelate fibre Treatment of Copper sewage |
| CN114007743A (en) * | 2019-06-20 | 2022-02-01 | 日本爱克兰工业株式会社 | Ion exchange fiber and ion exchange filter containing the same |
| CN114007743B (en) * | 2019-06-20 | 2023-09-15 | 日本爱克兰工业株式会社 | Ion exchange fiber and ion exchange filter containing the same |
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Application publication date: 20120215 |