CN105293769A - Method for removing dissolved organic matter and heavy metal ions in electroplating waste water - Google Patents
Method for removing dissolved organic matter and heavy metal ions in electroplating waste water Download PDFInfo
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- CN105293769A CN105293769A CN201510721657.1A CN201510721657A CN105293769A CN 105293769 A CN105293769 A CN 105293769A CN 201510721657 A CN201510721657 A CN 201510721657A CN 105293769 A CN105293769 A CN 105293769A
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Abstract
The invention discloses a method for removing dissolved organic matter and heavy metal ions in electroplating waste water. The method involves a pH value regulation tank and a filler tower capable of effectively removing dissolved organic matter and heavy metal ions. Modified kieselguhr and activated carbon serve as double-layer filler of the filler tower, and after being adsorbed by the filler, electroplating waste water reaches the national emission standard. The method is an environment-friendly green waste water treatment process which is high in organic matter and metal heavy ion removal rate, low in one-time investment, easy to run and operate and low in production treatment cost.
Description
Technical field
The present invention relates to and belongs to water-treatment technology field, is specifically related to a kind of method of dissolved organic matter and heavy metal ion in efficient removal electroplating wastewater.
Background technology
Electroplating wastewater refers to the waste water and waste liquids that electroplating facility or workshop are discharged in process of production, primarily of compositions such as plating piece rinse water, useless tank liquor, component cooling water and the flushing surface water.The water quality of electroplating wastewater can because of the difference of production technique difference to some extent.Topmost pollutent in electroplating wastewater is organic pollutant and the heavy metal ion of solubility, as chromium, nickel, cadmium etc., major part heavy metal ion exists with simple positively charged ion form, also part is had to exist with the complex anion form of acid radical anion form or complexity, general containing poisonous organic additive in electroplating wastewater in addition, as cyanogen etc.How poisonous electroplating wastewater is, and harm is comparatively large, and containing chromium zinc, copper, cadmium in electroplating wastewater, the heavy metal ion such as lead, nickel and acid, alkali, prussiate etc. have the pollutent of very large toxicity.Heavy metal can cause pathology to the multi viscera of human body, as cadmium can make kidney generation pathology, and can cause itai-itai.Sexavalent chrome can cause lung cancer, intestines and stomach disease and anaemia, and can accumulate in bone, spleen and liver, and cyanogen then can cause people and animals' acute poisoning, lethal, and lower concentration long term also can cause chronic poisoning.Therefore, electroplating wastewater has to pass through strict process, control discharge.The main method of current electroplating wastewater processing: chemical precipitation method, ion exchange method, RO membrane processing method, electrolytic process, biological process, UV treatment, method of evaporation etc., generally needing to be that several method combination treatment just can reach discharging standards, there is the problems such as complex process, energy consumption is large, cost is high, floor space is large, operational management is difficult in these methods.
4 summary of the invention
The object of the invention is the shortcoming overcoming prior art existence, a kind of method of efficient removal electroplating wastewater dissolved organic matter and heavy metal ion is provided.Object of the present invention is exactly the water quality and quantity situation according to electroplating wastewater, develops economy, removes the method for dissolved organic matter and heavy metal ion efficiently.Exploitation electroplating waste water high-efficiency removes pollutant handling arrangement, with friendly process and energy-saving and emission-reduction for main task, reduces environmental pollution, responds actively the legislations of environmental protection of increasingly stringent.
Remove a method for dissolved organic matter and heavy metal ion in electroplating wastewater, it is characterized in that, comprise the following steps:
(1) acid-alkali accommodation pond: electroplating wastewater flows into pH regulator pond by intake pump, and equalizing tank long-width ratio is 1.2 ~ 1.6, and the residence time is 5 ~ 20min, and mean flow rate is 1 ~ 10m/s; The one added in pH regulator pond in industrial sulphuric acid or calcium hydroxide regulates electroplating wastewater pH; The electroplating wastewater pH entering pH regulator pond is 6 ~ 9, and water outlet pH value controls 7 ~ 8, and pH meter and robot control system(RCS) are housed in equalizing tank, is regulated the dosage of industrial soda acid by control pH robot control system(RCS);
(2) high efficiency packing tower: electroplating wastewater enters the packing tower removing dissolved organic matter and heavy metal ion by lift pump, packing tower is containment cylinder, be divided into double-deck packing area, upper strata is modification infusorial earth packing layer, lower floor is active carbon filler layer, every layer of filler is all placed on filler dividing plate, and the volume ratio of modification infusorial earth filler and active carbon filler is (50% ~ 90%): (10% ~ 50%); The aspect ratio of packing tower is (5:1) ~ (30:1), and electroplating wastewater is the residence time 10 ~ 45min in packing tower, discharges from water port through filler fill area and filler dividing plate; Backwashing period 96h ~ the 240h of packing tower, with tap water, flush time is 5 ~ 10min.
Described modification infusorial earth packing layer is for be filled in modification infusorial earth in proportion in packing tower, and its feature comprises the preparation of modification infusorial earth:
(1) sieve: adopt crusher to cross screen sizing, it is 30 ~ 120 object diatomite that sieve gets particle diameter;
(2) cryodrying: particle diameter is 30 ~ 120 orders at the loft drier drying 2 ~ 4h of 105 DEG C;
(3) sodium agent is soaked and is stirred: be soak in the sodium agent solution of 2 ~ 25% in mass concentration by dried diatomite.Sodium agent is one or more mixtures of sodium-chlor, sodium carbonate, sodium hydroxide or sodium-acetate; Then thermostatic mixer stirs 5 ~ 16h, and stirring velocity is 500 ~ 1200r/min, and temperature remains on 80 ~ 95 DEG C;
(4) standing and dry: to stir and terminate the standing 15 ~ 29h of rear constant temperature, remove upper water solution subsequently, lower floor is had diatomaceous turbid liquid at 105 DEG C of loft drier drying 3 ~ 6h;
(5) aluminium salt soaks and stirs: be soak in the aluminum salt solution of 1 ~ 19% in concentration by dried diatomite.Aluminium salt is one or more mixtures of Tai-Ace S 150, aluminum chloride or potassium aluminium sulfate; Then thermostatic mixer stirs 2 ~ 11h, and stirring velocity is 500 ~ 1200r/min, and temperature remains between 67 ~ 85 DEG C, stirs and terminates rear standing 12 ~ 24h;
(6) dry and naturally cooling: leave standstill after terminating and gone by suspension, the turbid liquid of lower floor, at 105 DEG C of loft drier drying 3 ~ 6h, prepares modification infusorial earth after naturally cooling.
Preparing gained modification infusorial earth water-intake rate is 100% ~ 300%, and cation exchange capacity is 0.9 ~ 1.5mmol/g, wet compressive strengths 10 ~ 35kPa.
Described active carbon layer, the particle diameter of gac is 50 ~ 120 orders, and specific surface area is 2400 ~ 3600m2/g, and surface density is 370 ~ 580g/L.
The present invention proposes the technical scheme of solubility organic pollutant and heavy metal ion in novel removal electroplating wastewater, system solves the problem of electroplating wastewater exhaust emission environment.Particularly have employed efficient packing tower, modification infusorial earth packing area major function removes heavy metal ion in electroplating wastewater and dissolved organic matter, the interlamellar spacing of modification infusorial earth is large, interlayer becomes hydrophobicity from wetting ability, and in planar water, organic energy force rate ordinary silicon algae soil improves tens to hundred times.Modification infusorial earth have structure function adjustable, can efficient organics removal and heavy metal ion, can repeatedly use, the advantage such as saturated adsorption capacity is large.The function of active carbon filler layer is then remove heavy metal ion in electroplating wastewater and dissolved organic matter further and remove suspended substance and prevent the loss of filler.The invention provides a kind for the treatment of system removing solubility organic pollutant and heavy metal ion in electroplating wastewater, adopt treatment system up to standard of the present invention, one-time investment is low, and operation is simple, production processing cost is lower, the invention belongs to plating environmental protection production technique.The present invention efficiently solves with the Green Technologies For Waste Water Treatment of low cost and removes dissolved organic matter and heavy-metal pollution thing problem in electroplating wastewater.Therefore the present invention has economy and environmental protection double effects, has good social benefit and environmental benefit.
Embodiment
Below embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
embodiment 1:
Process the carrying out of Guangdong waste water from plating plant, treating processes is as follows:
First electroplating wastewater enters pH regulator pond, inlet flow-patterm is 6.5, equalizing tank long-width ratio is 1.5, the residence time is 15min, mean flow rate is 7m/s, add industrial hydrogen calcium oxide in pH regulator pond and regulate electroplating wastewater, according to pH meter and robot control system(RCS) are housed in equalizing tank, water outlet pH value being controlled in water outlet is 7.7.Then electroplating wastewater is entered by lift pump and removes dissolved organic matter and heavy metal ion packing tower, and packing tower major function is the inorganic pollutants such as organic pollutant and various heavy metal ion such as the dissolved organic matter removed in electroplating wastewater.Filler packing tower is containment cylinder.Described cylindrical aspect ratio is 20:1, and the residence time of electroplating wastewater in packing tower is 25min.Packing area is divided into modification infusorial earth packing layer and active carbon filler layer, and it is 85% that volume ratio is respectively modification infusorial earth packing layer, active carbon filler layer 15%.
The preparation of modification infusorial earth: (1) sieves: adopt crusher to cross screen sizing, it is 60 object diatomite that sieve gets particle diameter; (2) cryodrying: particle diameter is 60 orders at the dry 2h of loft drier of 105 DEG C; (3) sodium agent is soaked and is stirred: be soak in the sodium agent solution of 20% in concentration by dried diatomite, then thermostatic mixer stirs 6h, and stirring velocity is 800r/min, and temperature remains on 90 DEG C; (4) standing and dry: stirring terminates rear constant temperature and leaves standstill 15h, removes upper water solution subsequently, lower floor there is is diatomaceous turbid liquid at the dry 3h of 105 DEG C of loft drier; (5) aluminium salt soaks and stirs: be soak in the aluminum trichloride solution of 15% in concentration by dried diatomite, and then thermostatic mixer stirs 4h, and stirring velocity is 600r/min, and temperature remains on 75 DEG C, stirs and terminates rear standing 12h; (6) dry and naturally cooling: leave standstill after terminating and gone by suspension, the turbid liquid of lower floor, at the dry 4h of 105 DEG C of loft drier, prepares modification infusorial earth after naturally cooling.It is 230% that gained modification infusorial earth water-intake rate is prepared in detection, and cation exchange capacity is 1.1mmol/g, wet compressive strengths 15kPa.
Electroplating wastewater enters active carbon filler layer again after modification infusorial earth packing layer.Active carbon filler adopts the gac of 70 order particle diameters, and specific surface area is 2600m
2/ g, surface density is 380g/L.Electroplating wastewater is discharged from water port through the double-deck packing area of packing tower and filler dividing plate again.Packing tower backwashing period 240h, the tap water of back flushing enters from the flushing mouth of a river, and flush time is 8min.Last electroplating wastewater discharges after reaching discharging standards by detection.
Before and after electroplating wastewater processing, water quality testing data is as following table:
embodiment 2:
Process the carrying out of Jiangsu waste water from plating plant, treating processes is as follows:
First electroplating wastewater enters pH regulator pond, and inlet flow-patterm is 8.7, and equalizing tank long-width ratio is 1.4, the residence time is 10min, and mean flow rate is 7m/s, adds industrial sulphuric acid and regulate electroplating wastewater in pH regulator pond, according to pH meter and robot control system(RCS) are housed in equalizing tank, water outlet pH value being controlled in water outlet is 7.9.Then electroplating wastewater is entered by lift pump and removes dissolved organic matter and heavy metal ion packing tower, and packing tower major function is the inorganic pollutants such as organic pollutant and various heavy metal ion such as the dissolved organic matter removed in electroplating wastewater.Filler packing tower is containment cylinder.Described cylindrical aspect ratio is 15:1, and the residence time of electroplating wastewater in packing tower is 30min.Packing area is divided into modification infusorial earth packing layer and active carbon filler layer, and it is 80% that volume ratio is respectively modification infusorial earth packing layer, active carbon filler layer 20%.
The preparation of modification infusorial earth: (1) sieves: adopt crusher to cross screen sizing, it is 100 object diatomite that sieve gets particle diameter; (2) cryodrying: particle diameter is 100 orders at the dry 4h of loft drier of 105 DEG C; (3) sodium agent is soaked and is stirred: be soak in the sodium agent solution of 20% in concentration by dried diatomite, then thermostatic mixer stirs 11h, and stirring velocity is 1000r/min, and temperature remains on 92 DEG C; (4) standing and dry: stirring terminates rear constant temperature and leaves standstill 25h, removes upper water solution subsequently, lower floor there is is diatomaceous turbid liquid at the dry 4h of 105 DEG C of loft drier; (5) aluminium salt soaks and stirs: be soak in the alum liquor of 15% in concentration by dried diatomite.Then thermostatic mixer stirs 7h, and stirring velocity is 800r/min, and temperature remains on 81 DEG C, stirs and terminates rear standing 16h; (6) dry and naturally cooling: leave standstill after terminating and gone by suspension, the turbid liquid of lower floor, at the dry 4h of 105 DEG C of loft drier, prepares modification infusorial earth after naturally cooling.It is 260% that gained modification infusorial earth water-intake rate is prepared in detection, and cation exchange capacity is 1.4mmol/g, wet compressive strengths 30kPa.
Electroplating wastewater enters active carbon filler layer again after modification infusorial earth packing layer.Active carbon filler adopts the gac of 80 order particle diameters, and specific surface area is 3200m
2/ g, surface density is 470g/L.Electroplating wastewater is discharged from water port through the double-deck packing area of packing tower and filler dividing plate again.Packing tower backwashing period 192h.The tap water of back flushing enters from the flushing mouth of a river, and flush time is 9min.Last electroplating wastewater discharges after reaching discharging standards by detection.
Before and after electroplating wastewater processing, water quality testing data is as following table:
In sum, the treatment system of electroplating wastewater of the present invention achieves the qualified discharge of electroplating wastewater, and present invention process one-time investment is low; Liquid waste disposal effect stability; Production run cost is low; Level of automation is high, simple to operate.The present invention has fully demonstrated the effect of energy-saving and emission-reduction, is environmentally friendly Green Electroplating production technique.
Claims (4)
1. remove a method for dissolved organic matter and heavy metal ion in electroplating wastewater, it is characterized in that, comprise the following steps:
(1) acid-alkali accommodation pond: electroplating wastewater flows into pH regulator pond by intake pump, and equalizing tank long-width ratio is 1.2 ~ 1.6, and the residence time is 5 ~ 20min, and mean flow rate is 1 ~ 10m/s; The one added in pH regulator pond in industrial sulphuric acid or calcium hydroxide regulates electroplating wastewater pH; The electroplating wastewater pH entering pH regulator pond is 6 ~ 9, and water outlet pH value controls 7 ~ 8, and pH meter and robot control system(RCS) are housed in equalizing tank, is regulated the dosage of industrial soda acid by control pH robot control system(RCS);
(2) high efficiency packing tower: electroplating wastewater enters the packing tower removing dissolved organic matter and heavy metal ion by lift pump, packing tower is containment cylinder, be divided into double-deck packing area, upper strata is modification infusorial earth packing layer, lower floor is active carbon filler layer, every layer of filler is all placed on filler dividing plate, and the volume ratio of modification infusorial earth filler and active carbon filler is (50% ~ 90%): (10% ~ 50%); The aspect ratio of packing tower is (5:1) ~ (30:1), and electroplating wastewater is the residence time 10 ~ 45min in packing tower, discharges from water port through filler fill area and filler dividing plate; Backwashing period 96h ~ the 240h of packing tower, with tap water, flush time is 5 ~ 10min.
2. a kind of method removing dissolved organic matter and heavy metal ion in electroplating wastewater as claimed in claim 1, it is characterized in that, described modification infusorial earth packing layer is for be filled in modification infusorial earth in proportion in packing tower, and its feature comprises the preparation of modification infusorial earth:
(1) sieve: adopt crusher to cross screen sizing, it is 30 ~ 120 object diatomite that sieve gets particle diameter;
(2) cryodrying: particle diameter is 30 ~ 120 orders at the loft drier drying 2 ~ 4h of 105 DEG C;
(3) sodium agent is soaked and is stirred: be soak in the sodium agent solution of 2 ~ 25% in mass concentration by dried diatomite, sodium agent is one or more mixtures of sodium-chlor, sodium carbonate, sodium hydroxide or sodium-acetate; Then thermostatic mixer stirs 5 ~ 16h, and stirring velocity is 500 ~ 1200r/min, and temperature remains on 80 ~ 95 DEG C;
(4) standing and dry: to stir and terminate the standing 15 ~ 29h of rear constant temperature, remove upper water solution subsequently, lower floor is had diatomaceous turbid liquid at 105 DEG C of loft drier drying 3 ~ 6h;
(5) aluminium salt soaks and stirs: be soak in the aluminum salt solution of 1 ~ 19% in concentration by dried diatomite, aluminium salt is one or more mixtures of Tai-Ace S 150, aluminum chloride or potassium aluminium sulfate; Then thermostatic mixer stirs 2 ~ 11h, and stirring velocity is 500 ~ 1200r/min, and temperature remains between 67 ~ 85 DEG C, stirs and terminates rear standing 12 ~ 24h;
(6) dry and naturally cooling: leave standstill after terminating and gone by suspension, the turbid liquid of lower floor, at 105 DEG C of loft drier drying 3 ~ 6h, prepares modification infusorial earth after naturally cooling.
3. a kind of method removing dissolved organic matter and heavy metal ion in electroplating wastewater as claimed in claim 2, it is characterized in that, preparing gained modification infusorial earth water-intake rate is 100% ~ 300%, and cation exchange capacity is 0.9 ~ 1.5mmol/g, wet compressive strengths 10 ~ 35kPa.
4. a kind of method removing dissolved organic matter and heavy metal ion in electroplating wastewater as claimed in claim 1, it is characterized in that, described active carbon layer, the particle diameter of gac is 50 ~ 120 orders, specific surface area is 2400 ~ 3600m2/g, and surface density is 370 ~ 580g/L.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007056A (en) * | 2016-06-02 | 2016-10-12 | 哈尔滨工业大学 | Device and method for simultaneous removal of trace heavy metals in electroplating wastewater |
| CN108483713A (en) * | 2018-04-09 | 2018-09-04 | 南乙环境工程技术（上海）有限公司 | The treatment process and system of total zinc and total lead in electrobrightening waste water are removed simultaneously |
| CN110282698A (en) * | 2019-06-14 | 2019-09-27 | 中南林业科技大学 | A method of processing low-concentration heavy metal/organic matter compound wastewater |
| CN117700025A (en) * | 2023-12-26 | 2024-03-15 | 爱土工程环境科技有限公司 | Composite filler for antimony-containing sewage treatment and preparation method thereof |
| CN117700025B (en) * | 2023-12-26 | 2024-06-04 | 爱土工程环境科技有限公司 | Composite filler for antimony-containing sewage treatment and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002177770A (en) * | 2000-12-08 | 2002-06-25 | Yoshikazu Kumihigashi | Heavy metal adsorbent and method of preparing the same |
| CN103723852A (en) * | 2013-12-04 | 2014-04-16 | 刘军亮 | Sewage treatment method based on inorganic and organic heavy metal absorbents |
| CN104549135A (en) * | 2013-10-21 | 2015-04-29 | 大连市沙河口区中小微企业服务中心 | Copper-containing wastewater processing technology adopting modified diatomite |
-
2015
- 2015-10-30 CN CN201510721657.1A patent/CN105293769B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002177770A (en) * | 2000-12-08 | 2002-06-25 | Yoshikazu Kumihigashi | Heavy metal adsorbent and method of preparing the same |
| CN104549135A (en) * | 2013-10-21 | 2015-04-29 | 大连市沙河口区中小微企业服务中心 | Copper-containing wastewater processing technology adopting modified diatomite |
| CN103723852A (en) * | 2013-12-04 | 2014-04-16 | 刘军亮 | Sewage treatment method based on inorganic and organic heavy metal absorbents |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106007056A (en) * | 2016-06-02 | 2016-10-12 | 哈尔滨工业大学 | Device and method for simultaneous removal of trace heavy metals in electroplating wastewater |
| CN108483713A (en) * | 2018-04-09 | 2018-09-04 | 南乙环境工程技术（上海）有限公司 | The treatment process and system of total zinc and total lead in electrobrightening waste water are removed simultaneously |
| CN110282698A (en) * | 2019-06-14 | 2019-09-27 | 中南林业科技大学 | A method of processing low-concentration heavy metal/organic matter compound wastewater |
| CN117700025A (en) * | 2023-12-26 | 2024-03-15 | 爱土工程环境科技有限公司 | Composite filler for antimony-containing sewage treatment and preparation method thereof |
| CN117700025B (en) * | 2023-12-26 | 2024-06-04 | 爱土工程环境科技有限公司 | Composite filler for antimony-containing sewage treatment and preparation method thereof |
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