CN103641207A - Method for treating zinc-containing electroplating waste water in composite electrolytic tank - Google Patents

Method for treating zinc-containing electroplating waste water in composite electrolytic tank Download PDF

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CN103641207A
CN103641207A CN201310552119.5A CN201310552119A CN103641207A CN 103641207 A CN103641207 A CN 103641207A CN 201310552119 A CN201310552119 A CN 201310552119A CN 103641207 A CN103641207 A CN 103641207A
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waste water
electrode
zinc
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plate
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CN103641207B (en
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陈元彩
贺框
胡勇有
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South China University of Technology SCUT
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Abstract

The invention discloses a method for treating zinc-containing electroplating waste water in a composite electrolytic tank. Nickel-containing circuit board waste water is electrolytically treated in the composite electrolytic tank for 25-30min, an applied electric field provides a DC voltage of 22-25V after rectification, current strength is 0.8-1.0A, according to nickel-containing waste water per liter, an adding amount of NaCl is 0.05-0.15g/L, an air water volume ratio is controlled to be 3-3.5:1, and air is supplied by a air compressor; and a pH value of electrolytic water outlet is controlled to be 9.5-10 (re-dissolving until a pH is more than about 10.5), the electrolytic water outlet enters a plate sedimentation tank for sedimentation 0.5-1h, a supernatant is discharged out, and sludge is precipitated in a tank bottom sludge groove. The method has advantages of substantial zinc-removing effect, low total operation cost, small land occupation area, small investment and good pretreatment effect, and a zinc-iron removing rate can reach more than 99%.

Description

A kind of Zinc-containing electroplating waste water combined electrolysis groove treatment process
Technical field
The present invention relates to a kind of electroplating wastewater processing, particularly relate to a kind of Zinc-containing electroplating waste water combined electrolysis groove treatment process.
Background technology
Due to heavy metal ion not biodegradable, bioconcentration, as the key industry of heavy metal contamination, electroplate one of the most serious contaminated industry in the Yi Shi world today, the governing problem of the heavy metal wastewater thereby producing has become the focus that field of Environment Protection is paid close attention to.In electroplating wastewater, by contained pollutent, can be divided into cyanide-containing electroplating water, heavy metal-containing electroplating effluent, organic electroplating waste water, acidity and the alkaline waste waters etc. such as cupric, zinc, nickel, cadmium and lead.
Major technique and the method for Treatment of Zinc-containing Wastewater mainly contain: (1) uses the reduction such as ferrous sulfate, sodium metabisulfite, S-WAT, sulfurous gas; (2) utilize anionite-exchange resin to carry out ion-exchange; (3) electrochemical reduction; (4) evaporation is reclaimed; (5) absorption etc.But these methods exist or process, and pollutant kind is single, complex process, investment cost are high, maybe needs to add excessive chemical agent, sludge quantity is large, and then produce the problem of secondary pollution, be difficult to reach emission standard.
Summary of the invention
The object of the invention is to overcome the shortcoming of prior art, provide a kind of dezincification effect remarkable, overall operation expense is low, and floor space is little, invests little Zinc-containing electroplating waste water combined electrolysis groove treatment process.
Object of the present invention is achieved through the following technical solutions:
Zinc-containing electroplating waste water combined electrolysis groove treatment process: nickeliferous board wastewater is put into combined electrolysis groove and carry out an electrolysis treatment, extra electric field provides 22~25V volts DS after rectification, reacts 25~30 minutes, and strength of current is 0.8~1.0A; By every liter of nickel-containing waste water, add NaCl0.05~0.15g/L, controlling air water volume ratio ratio is 3~3.5:1; Control electrolysis water outlet pH value to 9.5~10, the waste water after electrolysis treatment enters inclined-plate clarifying basin, precipitation 0.5 ?1.0 hours, supernatant liquor is discharged, mud is sunken in pool bottom sludge groove;
Described combined electrolysis groove becomes a plurality of electrolyzer units by baffle for separating, the negative plate of each electrolyzer unit both sides and positive plate opposing parallel arrange, in electrolyzer unit, be provided with by the packing layer that dissolves granule electrode and insulating particle electrode, the volume ratio of dissolving granule electrode and insulating particle electrode is 1:1~3:1, dissolve granule electrode and insulating particle electrode account for electrolyzer unit cavity volume 40 ?50%, bottom of electrolytic tank is provided with aeration tube, and aeration tube bottom is provided with sludge sump;
Described dissolving granule electrode is that a plurality of diameters are less than 5mm, highly be less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 84~88% iron powders, 2~12% activated carbon powders, 2~4% calcium lignin sulphonates, 1~2% copper powder, 1% zinc oxide and 0.3~0.5% Zirconium oxide sintering moulding;
Described insulating particle electrode is that a plurality of diameters are less than 5mm, highly be less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 26~28% diatomite, 16~26% activated carbon powders, 37~57% clays, 2~7% calcium lignin sulphonates, 1~2% copper powder and 0.1~1% nickel oxide sinter molding.
For further realizing the object of the invention, preferably, described plate be take titanium sheet as matrix, first through the pre-treatment of mechanical polishing acid etching, then prepares SnO by thermal decomposition method 2+ Sb 2o 3+ MnO 2active intermediate.Described cathode plate is stainless steel plate.Described volts DS adopts TPR constant current constant voltage Power supply.Described control air water volume ratio ratio is that 3~3.5:1 adopts air compressor machine air feed.Described control electrolysis water outlet pH value to 9.5~10 are by adding alkali to regulate.
Zinc-containing electroplating waste water of the present invention enters combined electrolysis wastewater treatment equipment, compound micro-electrolytic waste water treatment equipment is by effective combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, by the direct electrochemistry redox of electrode, active substance ([H] and the Fe that electrode produces 2+, OH and H 2o 2deng) the high electric current spatiotemporal efficiency of redoxomorphism and three-diemsnional electrode indirectly, intensive treatment waste water.
The present invention carries out Zinc-containing electroplating waste water combined electrolysis groove by compound electric solution and dezincifies, compound electric solution is by the associating of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, device inside is equipped with positive/negative plate electrode, is dissolved granule electrode and insulating particle electrode, wherein, dissolve particle and take the micro-electrolytic action of iron powder as main, insulating particle plays anti-short circuit effect, and pole plate electrode adopts titanium base SnO 2+ Sb 2o 3+ MnO 2coated electrode, as the anode of overpotential electrolysis, has solved electrode and has easily come off, and electropotential is not high, and work-ing life is short, and surface is the problem of adsorbed product easily.The free radical of the nascent state producing in reaction process and coagulating agent, collection redox, flocculation absorption, catalyzed oxidation, complexing and deposition etc. act as one, dissolve particle and dissolve the Fe producing 2+directly and Zn 2+under alkaline condition, produce Zn (OH) 2and Fe (OH) 3co-precipitation, removes rapidly the zinc in zinc-containing water.In this technique, do not need to add again other chemical agent, so this system operation is easy.By the direct electrochemistry redox of electrode, active substance ([H] and the Fe that electrode produces 2+, OH and H 2o 2deng) the high electric current spatiotemporal efficiency of redoxomorphism and three-diemsnional electrode indirectly, intensive treatment waste water dezincification efficiency.
Compared with the conventional method, tool has the following advantages in the present invention:
(1) Zinc-containing electroplating waste water combined electrolysis groove of the present invention dezincifies by the combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, by the direct electrochemistry redox of electrode, active substance ([H] and the Fe that electrode produces 2+, OH and H 2o 2deng) the high electric current spatiotemporal efficiency of redoxomorphism and three-diemsnional electrode indirectly, strengthening dezincification efficiency, adopts three-diemsnional electrode or fluidized bed electrochemical reactor, utilizes its higher mass transfer specific surface area, improves electrochemical reactor efficiency.
(2) compound electric solution of the present invention has that device structure is simple, applied widely, treatment effect is good;
(3) because without adding chemical agent, sludge quantity is little, compare power consumption and greatly reduce, so Zinc-containing electroplating waste water combined electrolysis groove treatment process working cost of the present invention is cheap with electrolysis;
(4) because of what adopt, be combined electrolysis slot device, operating parameter can be adjusted with change of water quality, and combined electrolysis groove has the packing layer of insulating particle electrode simultaneously, can play shock absorption to the waste water of a large amount of and high density; Therefore the impact that Zinc-containing electroplating waste water combined electrolysis groove treatment process of the present invention can be born big yield and high-concentration waste water;
(5) advantage such as Zinc-containing electroplating waste water combined electrolysis groove treatment process convenient operating maintenance of the present invention and easy and other method of wastewater treatment couplings.
(6) the present invention has added diatomite in insulated electrode, and diatomite can adsorb Cr 3+, Pb 2+, Cd 2+, Cu 2+, Zn 2+contribute to the removal of zine ion in electroplating wastewater.
Accompanying drawing explanation
Fig. 1 is combined electrolysis groove structural representation of the present invention.
Shown in figure: 1 aeration tube; 2 insulating particle electrodes; 3 dissolve granule electrode; 4 anodes; 5 negative electrodes; 6 dividing plates; 7 electrolyzer units; 8 support air distribution plate; 9 sludge sumps.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further illustrated, but the scope of protection of present invention is not limited to the scope of embodiment statement.
As shown in Figure 1, combined electrolysis groove of the present invention is separated into a plurality of electrolyzer units 7 by dividing plate 6, and the negative plate 5 of each electrolyzer unit both sides and positive plate 4 opposing parallel settings are provided with in electrolyzer unit 7 and dissolve granule electrode 3 and insulating particle electrode 2; The volume ratio of dissolving granule electrode 3 and insulating particle electrode 2 is 1:1~3:1; Dissolve granule electrode 3 and insulating particle electrode 2 formation packing layers; Bottom of electrolytic tank is provided with aeration tube 1, and aeration tube 1 bottom is provided with sludge sump 9; Aeration tube 1 is positioned at and supports air distribution plate 8 belows, and by supporting the even gas distribution of air distribution plate 8, aeration tube 1 is connected with air compressor machine.Negative plate 5 is connected with TPR constant current constant voltage power supply with positive plate 4.Inclined-plate clarifying basin is conventional equipment, be connected with last electrolyzer unit 7, is used for precipitate and separate.
Embodiment 1
Zinc-containing electroplating waste water with the inventive method concentration for the treatment of 156mg/L.The water quality situation of this Zinc-containing electroplating waste water is as follows: Zn156mg/L, COD cr212mg/L, SS56mg/L, pH6.8.Zinc is to maintain body normal growth to grow, metabolic important substance, and it participates in protein synthesis, promotes cell fission, growth and regeneration.But, if zinc is too high at people's in-vivo content, will suppress phagocytal activity and sterilizing power, thereby reduce the immunologic function of human body, resistibility is weakened, disease susceptibility is increased and, the SS containing in waste water and other metal ions also can cause larger harm to environment.
Combined electrolysis groove 7 inside are divided into four electrolyzer units by dividing plate by reactor, current are advanced in plug-flow mode in reactor, guarantee waste liquid and in granule electrode, have sufficient contact, battery lead plate is equipped with in reactor both sides, adopt TPR constant current constant voltage power supply to supply with current/voltage, negative plate 5 and positive plate 4 opposing parallel settings, device internal main will comprise the packing layer that dissolves granule electrode 3 and insulating particle electrode 2, dividing plate 6, support air distribution plate 8, aeration tube 1, the parts such as sludge sump 9, extra electric field provides the volts DS of the 22V after rectification, strength of current is 0.8A, NaCl dosage is 0.06g/L, gas-water ratio is 3:1, use air compressor machine air feed, reactor bottom arranges micro-hole aerator, react after 25 minutes.The volume ratio of dissolving granule electrode 3 and insulating particle electrode 2 is 1:1, and the two accounts for 50% of electrolyzer unit cavity volume together, and electrolyzer unit cavity volume refers in electrolyzer unit the volume in whole space between negative plate 5 and positive plate 4.
In material component mass percent, wherein dissolve granule electrode raw material by 84% iron powder, 8% activated carbon powder, 4% calcium lignin sulphonate, 2% copper powder, 1% zinc oxide, 1% zirconium white forms, and after raw material mixes, being squeezed into diameter is the post strip of 5mm, cut into highly as the column of 1mm, under the condition of 480 ℃ and anoxic, sintering is 2 hours, and formation diameter is 5mm, is highly the column of 1mm.
In material component mass percent, insulating particle electrode material is by 26% diatomite, 20.8% activated carbon powder, 48% clay, 4% calcium lignin sulphonate, 1% copper powder, 0.2% nickel oxide forms, and after raw material mixes, being squeezed into diameter is the post strip of 5mm, cut into highly as the column of 1mm, under the condition of 480 ℃ and anoxic, sintering is 2 hours, and formation diameter is 5mm, is highly the column of 1mm.
It is matrix that plate 4 be take the titanium sheet that thick 0.8mm, size be 80mm * 10mm, uses successively emery cloth, 300 #after liquid honing, in 0.1mol/L oxalic acid solution, boil 2h, put into 0.1mol/L oxalic acid solution preserve stand-by, through pre-treatment such as mechanical polishing acid etchings; Preparation middle layer masking liquid: first by SnCl 45H 2o, SbCl 38:1 mixes in mass ratio, then is dissolved in hydrochloric acid and propyl carbinol (1:1) solution by 1:10, makes middle layer masking liquid.Pre-processing titanium sheet is cleaned, dried, coat prepared middle layer solution, put into 120 ℃ of baking ovens and react 15min, then proceed to thermolysis 10min in the retort furnace of 500 ℃, 5 times repeatedly, be extended down to for the last time 1.0h, make middle layer; On middle layer, continue to apply to be added with saturated Mn (NO 3) 2propyl carbinol water (1:1) solution, put into after 100 ℃ of baking ovens react 10min and proceed to the retort furnace thermolysis 10min of 475 ℃, 10 times repeatedly, be extended down to for the last time 1.0h, make SnO 2+ Sb 2o 3+ MnO 2middle layer; Wherein Mn, O, Sn, Sb mass ratio are 48.8%, 26.1%, 14.7%, 10.4%.Finally the back side that is shaped with the titanium sheet in middle layer is lived by rubber seal, be contained on electrolyzer, carry out one-side electroplating, increase the good combination of coating and matrix, improve electropotential, surface is the problem of adsorbed product easily.5 of cathode plates are stainless steel plate.
Zinc-containing electroplating waste water combined electrolysis groove is processed, and comprises the steps:
(1) waste water enters combined electrolysis wastewater treatment equipment, extra electric field provides and after rectification, forms 22V volts DS, adopt TPR constant current constant voltage power supply to supply with current/voltage, react 25 minutes, strength of current is that 0.8A, NaCl dosage are that 0.06g/L(is under 22V volts DS, can generation current intensity be 0.8A, required interpolation 0.06g/L NaCl).With air compressor machine, by aeration tube 1 air feed, gas-water ratio is 3:1.Free radical and the coagulating agent of the nascent state producing in the association response process by three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, collection redox, flocculation absorption, catalyzed oxidation, complexing and deposition etc. act as one, dissolve particle and dissolve the Fe producing 2+directly and Zn 2+produce together Zn (OH) 2and Fe (OH) 3co-precipitation, removes rapidly the zinc in zinc-containing water.
(2) inclined-plate clarifying basin precipitation: the water outlet that step (1) is obtained adds alkali to regulate pH value to 9.5~10, enter inclined-plate clarifying basin (electroplating processes conventional equipment), waste water enters after combined electrolysis wastewater treatment equipment, by pipeline, flow into and enter inclined-plate clarifying basin, supernatant liquor is discharged, and mud is sunken in the sludge sump of pool bottom sludge groove 9 inclined-plate clarifying basins.
(3) it is that 10% dilute sulphuric acid carries out pH value and pulls back to 9.0 that water outlet step (2) being obtained adds mass concentration, realizes qualified discharge.
Treatment effect is analyzed:
When the starting point concentration of zinc-containing water is Zn156mg/L, COD cr212mg/L, SS56mg/L, pH6.8.Electrolysis time is that 30min, strength of current are that 1A, NaCl dosage are while being 0.10g/L.Adopt aas determination zinc ion concentration, measuring through a water outlet Zn concentration of separating after processing is 1.23m g/L, COD cr45mg/L, SS10mg/L(GB/T7475 ?1987, GB/T11914 ?1989 and GB/T11901 ?1989), the clearance of zine ion is that the initial dense degree ?of 99.8%((goes out water concentration) and/starting point concentration).After processing, water outlet is lower than discharging standards 2.0mg/L.Working cost: 1.03 yuan/m 3(processing required electric cost, cost of drugs and the consumption of electrode cost sum of zinc-containing water of unit volume).
In this example, compound electric solution is by the associating of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, device inside is equipped with positive/negative plate electrode, is dissolved granule electrode and insulating particle electrode, wherein, dissolve particle and take the micro-electrolytic action of iron powder as main, insulating particle plays anti-short circuit effect, and has added zirconium white, plays the effect of stabilized electrodes.Three-diemsnional electrode has increased the contact area between electrode and waste water greatly, and the efficiency that makes electrolytic pole board process waste water improves greatly.The employing titanium base SnO that electrode is breakthrough 2+ Sb 2o 3+ MnO 2coated electrode, as the anodizing zinc-containing water of overpotential electrolysis, has solved electrode and has easily come off, and electropotential is not high, and work-ing life is short, and surface is the problem of adsorbed product easily.Significantly different from patent 200710026285.6 is to add diatomite in insulating particle electrode, because it has good chemical stability, not with electrolytic solution generation chemical reaction, be difficult for being corroded by infiltration, and obviously increase with other component bonding strength of insulating particle, mechanical property improves greatly.The free radical of the nascent state producing in reaction process and coagulating agent, collection redox, flocculation absorption, catalyzed oxidation, complexing and deposition etc. act as one, dissolve particle and dissolve the Fe producing 2+directly and Zn 2+produce together Zn (OH) 2and Fe (OH) 3co-precipitation, removes rapidly the zinc in zinc-containing water.In this technique, do not need to add again other chemical agent, so this system operation is easy.By the direct electrochemistry redox of electrode, active substance ([H] and the Fe that electrode produces 2+, OH and H 2o 2deng) the high electric current spatiotemporal efficiency of redoxomorphism and three-diemsnional electrode indirectly, intensive treatment waste water dezincification efficiency.
Embodiment 2
By the inventive method, process Zinc-containing electroplating waste water: Zn122.4mg/L, COD cr180mg/L, SS52mg/L, pH7.3.
(1) waste water enters combined electrolysis wastewater treatment equipment, and compound micro-electrolytic waste water treatment equipment is by effective combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech.Wherein, combined electrolysis groove 7 inside are divided into four chambers by dividing plate by reactor, current are advanced in plug-flow mode in reactor, guarantee waste liquid and in granule electrode, have sufficient contact, battery lead plate is equipped with in reactor both sides, adopt TPR constant current constant voltage power supply to supply with current/voltage, negative plate 5 and positive plate 4 opposing parallel settings, device internal main will comprise the packing layer that dissolves granule electrode 3 and insulating particle electrode 2, dividing plate 6, support air distribution plate 8, aeration tube 1, the parts such as sludge sump 9, extra electric field provides the volts DS of the 24V after rectification, react after 28 minutes, extra electric field provides the volts DS of the 24V after rectification, strength of current is 0.9A, NaCl dosage is 0.10g/L, gas-water ratio is 3.2:1, use air compressor machine air feed, reactor bottom arranges micro-hole aerator, react after 28 minutes.
Filler is by dissolving granule electrode 3 and insulating particle electrode 2(volume ratio 2:1) electrode forms, dissolve granule electrode 3 and insulating particle electrode 2 and account for 45% of electrolyzer unit cavity volume, by percentage to the quality, dissolve granule electrode by 86% iron powder, 7.7% activated carbon powder, 4% calcium lignin sulphonate, 1% copper powder, 1% zinc oxide, 0.3% zirconium white, being squeezed into diameter is the post strip of 5mm, cut into highly as the column of 1mm, under the condition of 480 ℃ and anoxic, sintering is 2 hours, and formation diameter is 5mm, is highly the column of 1mm.
Insulating particle electrode is by 18.8% activated carbon powder, 28% diatomite, 48% clay, 4% calcium lignin sulphonate, 1% copper powder, 0.2% nickel oxide, being squeezed into diameter is the post strip of 5mm, and cutting into is highly the column of 1mm, and under the condition of 480 ℃ and anoxic, sintering is 2 hours, formation diameter is 5mm, is highly the column of 1mm.
Plate 4 be take titanium sheet as matrix, first through pre-treatment such as mechanical polishing acid etchings, then prepares active intermediate SnO by thermal decomposition method 2+ Sb 2o 3+ MnO 2, the good combination of increase coating and matrix, improves electropotential, and surface is the problem of adsorbed product easily.5 of cathode plates are stainless steel plate.
(2) utilize described combined electrolysis groove to dezincify, extra electric field provides the volts DS of the 24V after rectification, adopts TPR constant current constant voltage power supply to supply with current/voltage, reacts 28 minutes, strength of current is that 0.9A, NaCl dosage are that 0.10g/L, gas-water ratio are 3.2:1, uses air compressor machine air feed.Dissolving granule electrode 3 is 2:1 with the volume ratio of noble electrode 2, and by the associating of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, device inside is equipped with positive/negative plate electrode, is dissolved granule electrode and insulating particle electrode.The free radical of the nascent state producing in reaction process and coagulating agent, collection redox, flocculation absorption, catalyzed oxidation, complexing and deposition etc. act as one, dissolve particle and dissolve the Fe producing 2+directly and Zn 2+produce together Zn (OH) 2and Fe (OH) 3co-precipitation, removes rapidly the zinc in zinc-containing water.
(3) inclined-plate clarifying basin precipitation: the water outlet that step (2) is obtained adds alkali to regulate pH value to 9.5~10, enters inclined-plate clarifying basin, and supernatant liquor is discharged, and mud is sunken in pool bottom sludge groove.
(4) water outlet step (3) being obtained adds 10% dilute sulphuric acid to carry out pH value to pull back to 9.0, realize qualified discharge.
Treatment effect is analyzed: by the inventive method, process Zinc-containing electroplating waste water.Zn122.4mg/L、COD Cr180mg/L,SS52mg/L,pH7.3。
When the treatment time, be that 28min, strength of current are 0.9A, NaCl dosage while being 0.10g/L, the clearance of Zn is 99.7%, and water outlet Zn concentration reaches 0.38mg/L, COD cr79mg/L, SS33mg/L, working cost: 2.05 yuan/m3, after processing, Zn water outlet is lower than discharging standards 2.0mg/L.
Embodiment 3
By the inventive method, process Zinc-containing electroplating waste water.Zn95.8mg/L、、COD Cr144mg/L,SS53mg/L,pH7.6。
(1) waste water enters combined electrolysis wastewater treatment equipment, and compound micro-electrolytic waste water treatment equipment is by effective combination of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech.Wherein, combined electrolysis groove 7 inside are divided into four chambers by dividing plate by reactor, current are advanced in plug-flow mode in reactor, guarantee waste liquid and in granule electrode, have sufficient contact, battery lead plate is equipped with in reactor both sides, adopt TPR constant current constant voltage power supply to supply with current/voltage, negative plate 5 and positive plate 4 opposing parallel settings, device internal main will comprise the packing layer that dissolves granule electrode 3 and insulating particle electrode 2, dividing plate 6, support air distribution plate 8, aeration tube 1, the parts such as sludge sump 9, extra electric field provides 25 volts DSs after rectification, react after 30 minutes, extra electric field provides the volts DS of the 25V after rectification, strength of current is 1.0A, NaCl dosage is 0.14g/L, gas-water ratio is 3.5:1, use air compressor machine air feed, reactor bottom arranges micro-hole aerator, react after 30 minutes.
Filler is by dissolving granule electrode 3 and insulating particle electrode 2(volume ratio 3:1) electrode forms, dissolve granule electrode 3 and insulating particle electrode 2 and account for 40% of electrolyzer unit cavity volume, by percentage to the quality, dissolve granule electrode by 88% iron powder, 5.7% activated carbon powder, 4% calcium lignin sulphonate, 1% copper powder, 1% zinc oxide, 0.3% zirconium white, being squeezed into diameter is the post strip of 5mm, cut into highly as the column of 1mm, under the condition of 480 ℃ and anoxic, sintering is 2 hours, and formation diameter is 5mm, is highly the column of 1mm.
By percentage to the quality, insulating particle electrode is by 19.8% activated carbon powder, 27% diatomite, 48% clay, 4% calcium lignin sulphonate, 1% copper powder, 0.2% nickel oxide, being squeezed into diameter is the post strip of 5mm, cut into highly as the column of 1mm, under the condition of 480 ℃ and anoxic, sintering is 2 hours, and formation diameter is 5mm, is highly the column of 1mm.
Plate 4 be take titanium sheet as matrix, first through pre-treatment such as mechanical polishing acid etchings, then prepares active intermediate SnO by thermal decomposition method 2+ Sb 2o 3+ MnO 2, the good combination of increase coating and matrix, improves electropotential, and surface is the problem of adsorbed product easily.5 of cathode plates are stainless steel plate.
(2) utilize described combined electrolysis groove to dezincify, extra electric field provides the volts DS of the 25V after rectification, adopts TPR constant current constant voltage power supply to supply with current/voltage, reacts 30 minutes, strength of current is that 1.0A, NaCl dosage are that 0.14g/L, gas-water ratio are 3.5:1, uses air compressor machine air feed.Dissolving granule electrode 3 is 3:1 with the volume ratio of noble electrode 2, and by the associating of three-diemsnional electrode, catalytic oxidation and micro electrolysis tech, device inside is equipped with positive/negative plate electrode, is dissolved granule electrode and insulating particle electrode.The free radical of the nascent state producing in reaction process and coagulating agent, collection redox, flocculation absorption, catalyzed oxidation, complexing and deposition etc. act as one, dissolve the Fe that particle produces 2+directly and Zn 2+produce together Zn (OH) 2and Fe (OH) 3co-precipitation, removes rapidly the zinc in zinc-containing water.Dissolving granule electrode 3 and defining of insulating particle electrode 2 consumptions please supplement, and how electrolytic process and dissolving granule electrode 3 and insulating particle electrode 2 will be described and will supplement these contents of waste water effect
(3) inclined-plate clarifying basin precipitation: the water outlet that step (2) is obtained adds alkali to regulate pH value to 9.5~10, enters inclined-plate clarifying basin, and supernatant liquor is discharged, and mud is sunken in pool bottom sludge groove.
(4) water outlet step (3) being obtained adds 10% dilute sulphuric acid to carry out pH value to pull back to 9.0, realize qualified discharge.
Treatment effect is analyzed: when the treatment time, be that 30min, strength of current are 1.0A, NaCl dosage while being 0.14g/L, water outlet Zn concentration reaches 0.71m g/L, COD cr63mg/L, SS17mg/L, working cost: 1.32 yuan/m 3, after processing, water outlet Zn is lower than discharging standards 2.0mg/L.

Claims (6)

1. a Zinc-containing electroplating waste water combined electrolysis groove treatment process, it is characterized in that: nickeliferous board wastewater is put into combined electrolysis groove and carry out electrolysis treatment, extra electric field provides 22~25V volts DS after rectification, reacts 25~30 minutes, and strength of current is 0.8~1.0A; By every liter of nickel-containing waste water, add NaCl0.05~0.15g/L, controlling air water volume ratio ratio is 3~3.5:1; Control electrolysis water outlet pH value to 9.5~10, the waste water after electrolysis treatment enters inclined-plate clarifying basin, precipitation 0.5 ?1.0 hours, supernatant liquor is discharged, mud is sunken in pool bottom sludge groove;
Described combined electrolysis groove becomes a plurality of electrolyzer units by baffle for separating, the negative plate of each electrolyzer unit both sides and positive plate opposing parallel arrange, in electrolyzer unit, be provided with by the packing layer that dissolves granule electrode and insulating particle electrode, the volume ratio of dissolving granule electrode and insulating particle electrode is 1:1~3:1, dissolve granule electrode and insulating particle electrode account for electrolyzer unit cavity volume 40 ?50%, bottom of electrolytic tank is provided with aeration tube, and aeration tube bottom is provided with sludge sump;
Described dissolving granule electrode is that a plurality of diameters are less than 5mm, highly be less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 84~88% iron powders, 2~12% activated carbon powders, 2~4% calcium lignin sulphonates, 1~2% copper powder, 1% zinc oxide and 0.3~0.5% Zirconium oxide sintering moulding;
Described insulating particle electrode is that a plurality of diameters are less than 5mm, highly be less than the cylindrical particle of 1mm, by percentage to the quality, cylindrical particle is by 26~28% diatomite, 16~26% activated carbon powders, 37~57% clays, 2~7% calcium lignin sulphonates, 1~2% copper powder and 0.1~1% nickel oxide sinter molding.
2. Zinc-containing electroplating waste water combined electrolysis groove treatment process according to claim 1, is characterized in that: described plate be take titanium sheet as matrix, first through the pre-treatment of mechanical polishing acid etching, then prepares SnO by thermal decomposition method 2+ Sb 2o 3+ MnO 2active intermediate.
3. Zinc-containing electroplating waste water combined electrolysis groove treatment process according to claim 1, is characterized in that: described cathode plate is stainless steel plate.
4. Zinc-containing electroplating waste water combined electrolysis groove treatment process according to claim 1, is characterized in that: described volts DS adopts TPR constant current constant voltage Power supply.
5. Zinc-containing electroplating waste water combined electrolysis groove treatment process according to claim 1, is characterized in that: described control air water volume ratio ratio is that 3~3.5:1 adopts air compressor machine air feed.
6. Zinc-containing electroplating waste water combined electrolysis groove treatment process according to claim 1, is characterized in that: described control electrolysis water outlet pH value to 9.5~10 are by adding alkali to regulate.
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