CN105236639A - Chromium-containing wastewater treatment process - Google Patents
Chromium-containing wastewater treatment process Download PDFInfo
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- CN105236639A CN105236639A CN201510721214.2A CN201510721214A CN105236639A CN 105236639 A CN105236639 A CN 105236639A CN 201510721214 A CN201510721214 A CN 201510721214A CN 105236639 A CN105236639 A CN 105236639A
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- waste water
- chromate
- chromium
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- containing wastewater
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Abstract
The invention provides a chromium-containing wastewater treatment process comprising the following steps: (1) chromium-containing wastewater is delivered through a grille, and is preliminarily filtered; (2) the filtered chromium-containing wastewater is delivered into a homogenization adjustment tank, and is homogenized; (3) the homogenized chromium-containing wastewater is delivered into a pH value regulating tank; dilute sulfuric acid is added into the tank, and the pH value is regulated to 2-3; (4) the chromium-containing wastewater obtained after pH value regulation is delivered into a reduction tank; a reducing agent is added into the reduction tank, such that Cr<6+> in the chromium-containing wastewater is reduced into Cr<3+>; (5) NaOH is added into the reduction tank, such that the pH value is regulated to 8-9, and Cr<3+> in the chromium-containing wastewater is converted into Cr(OH)3 precipitate, wherein a reaction time is 30-40min; and (6) wastewater is stored and collected; and the precipitate is press-filtered by a filter press and is subjected to centralized storage. The process provided by the invention has the advantages of simple steps and low treatment cost. With the process, hexavalent chromium ions in wastewater can be effectively removed, and a water body is prevented from pollution. The process is environment-friendly.
Description
Technical field
The present invention relates to a kind of process for processing chromate-containing waste water.
Background technology
In metallurgical industry, plating, process hides, paint, the industry such as to take pictures discharges a large amount of chromate waste waters every day, the chromium in chromate waste water is mainly with sexavalence (Cr
6+) and trivalent (Cr
3+) form existence, if if the not treated direct discharge of these chromate waste waters, cause very large harm by environment.Its toxicity is then strong with sexavalent chrome, and be about chromic 100 times, trivalent chromium takes second place, and bivalent chromium and the toxicity of chromium own is very little or nontoxicity.Chromium compounds can invade people's human body by digestive tube, respiratory tract, skin and mucous membrane, mainly accumulates in liver, kidney, endocrine system and lung.Toxicological effect affects substance in vivo oxidation, reduction and hydrolytic process, is combined affects the phosphorus content in organizing with nucleic acid, nucleoprotein.Chromium cpd has carcinogenesis.
If with the rural sewage disposal farm containing chromium, chromium is just in plant materials inner accumulated, and the digestion of soil with organic matter is suppressed, and causes the agriculture underproduction.Therefore, various countries are to the chromium content of the waste water discharged, fisheries water water quality, field irrigation water quality, the surface water and tap water, and all there are strict requirements.China has been defined as sexavalent chrome one of index implementing overall control, and in the waste water of regulation industrial discharge, sexavalent chrome maximum concentration is 0.5mg/L, and the maximum concentration of total chromium is 1.5mg/L, and not handy dilution method replaces necessary process; In Drinking Water, chromium content must not more than 0.05mg/L.
Therefore, imperative to the process of chromate waste water in Industrial processes, especially to sexavalent chrome (Cr
6+) process, to this, the following patent documentation of current domestic main existence:
Patent publication No.: CN104829018A, disclose a kind of chromium containing waste water treatment method, key step is: added by treatment agent in chromate waste water, and in chromate waste water, the total mass concentration of chromium is 10 ~ 100mg/L, adds 5 ~ 10g treatment agent in often liter of chromate waste water, ultrasonic 20 ~ 30min after continuous stirring 10 ~ 30min, standing sedimentation, filters, can discharge after filtrate pH is adjusted to neutrality, wherein treatment agent is made up of the component of following mass percent: 3 ~ 5% pulullan polysaccharides, 5 ~ 10% zeolite-loaded nano-TiOs
2, surplus is modified alta-mud.The treatment agent of the present invention by adding in chromate waste water through Optimal improvements, utilize the adsorption-flocculation effect for the treatment of agent, coordinate ultrasonic cavitation and flocculating effect again, the chromium precipitation in chromate waste water removed after leaving standstill and filtering, processing step is simple, workable, suitability is wide, and efficiently, processing cost is low, the clearance of waste water chromium is high, in actual chromate waste water process, have good application prospect.But this patent, in treating processes, also needs a kind for the treatment of agent of specialized designs, increases processing cost, be unfavorable for mass disposal industrial chromium-containing waste water.
Summary of the invention
For solving above-mentioned Problems existing, the object of the present invention is to provide a kind of process for processing chromate-containing waste water, described processing step is simple, and processing cost is cheap, effectively can remove the hexavalent chromium in waste water, and protection water body is not contaminated, environmentally friendly.
For achieving the above object, technical scheme of the present invention is:
A kind of process for processing chromate-containing waste water, comprises the steps:
1) chromate waste water is tentatively filtered by grille well;
2) chromate waste water after filtering is sent in homogeneous equalizing tank, carries out homogenization treatment;
3) chromate waste water after equal quality regulate process sends into pH value equalizing tank, adds dilute sulphuric acid, adjust ph to 2 ~ 3 in pond;
4) chromate waste water after adjust ph sends into reduction pond, adds reductive agent, by the Cr in chromate waste water to reduction pond
6+be reduced to Cr
3+;
5) in reduction pond, NaOH is added, adjust ph to 8 ~ 9, by the Cr in chromate waste water
3+be converted into Cr (OH)
3precipitation, reaction times 30 ~ 40min;
6) storage of waste water is collected, and leaves concentratedly after precipitating pressure filter press filtration after filtration.
Further, Cr in described chromate waste water
6+concentration is 10 ~ 50mg/L.
Separately, step 4) described in reductive agent be NaHSO
3.
Separately have, step 4) in the mass volume ratio of reductive agent and chromate waste water be 40 ~ 50:1, g/L.
Again, step 5) in the mass volume ratio of precipitation agent and chromate waste water be 20 ~ 30:1, g/L.
Further, step 6) in precipitation agent be lime, NaOH or Na
2cO
3.
And, step 6) in precipitation agent be NaOH.
Separately, step 7) Cr in described waste liquid
6+content is 0.l ~ 0.5mg/L.
Beneficial effect of the present invention is:
Described processing step is simple, and processing cost is cheap, effectively can remove the hexavalent chromium in waste water, and protection water body is not contaminated, environmentally friendly, Cr in processed waste water
6+content is lower than 0.5mg/L, reaches National Industrial wastewater discharge standard.
Embodiment
Following examples for illustration of the present invention, but can not be used for limiting the scope of the invention.The implementation condition adopted in embodiment can be for further adjustments according to the condition of producer, and unaccounted implementation condition is generally conventional laboratory conditions.
A kind of process for processing chromate-containing waste water provided by the present invention, comprises the steps:
1) chromate waste water is tentatively filtered by grille well;
2) chromate waste water after filtering is sent in homogeneous equalizing tank, carries out homogenization treatment;
3) chromate waste water after equal quality regulate process sends into pH value equalizing tank, adds dilute sulphuric acid, adjust ph to 2 ~ 3 in pond;
4) chromate waste water after adjust ph sends into reduction pond, adds reductive agent, by the Cr in chromate waste water to reduction pond
6+be reduced to Cr
3+;
5) in reduction pond, NaOH is added, adjust ph to 8 ~ 9, by the Cr in chromate waste water
3+be converted into Cr (OH)
3precipitation, reaction times 30 ~ 40min;
6) storage of waste water is collected, and leaves concentratedly after precipitating pressure filter press filtration after filtration.
Further, Cr in described chromate waste water
6+concentration is 10 ~ 50mg/L.
Separately, step 4) described in reductive agent be NaHSO
3.
Separately have, step 4) in the mass volume ratio of reductive agent and chromate waste water be 40 ~ 50:1, g/L.
Again, step 5) in the mass volume ratio of precipitation agent and chromate waste water be 20 ~ 30:1, g/L.
Further, step 6) in precipitation agent be lime, NaOH or Na
2cO
3.
And, step 6) in precipitation agent be NaOH.
Separately, step 7) Cr in described waste liquid
6+content is 0.l ~ 0.5mg/L.
A kind of process for processing chromate-containing waste water provided by the present invention, step is simple, and processing cost is cheap, effectively can remove the hexavalent chromium in waste water, and protection water body is not contaminated, environmentally friendly, Cr in processed waste water
6+content is lower than 0.5mg/L, reaches National Industrial wastewater discharge standard.
It should be noted that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted.Although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to the technical scheme of invention or equivalent replacement, and not depart from the scope of technical solution of the present invention, it all should be encompassed in right of the present invention.
Claims (8)
1. a process for processing chromate-containing waste water, is characterized in that, comprises the steps:
Chromate waste water is tentatively filtered by grille well;
Chromate waste water after filtration is sent in homogeneous equalizing tank, carries out homogenization treatment;
Chromate waste water after equal quality regulate process sends into pH value equalizing tank, adds dilute sulphuric acid, adjust ph to 2 ~ 3 in pond;
Chromate waste water after adjust ph sends into reduction pond, adds reductive agent, by the Cr in chromate waste water to reduction pond
6+be reduced to Cr
3+;
Precipitation agent is added, adjust ph to 8 ~ 9, by the Cr in chromate waste water in reduction pond
3+be converted into Cr (OH)
3precipitation, reaction times 30 ~ 40min;
Storage of waste water is collected, and leaves concentratedly after precipitating pressure filter press filtration after filtration.
2. according to a kind of process for processing chromate-containing waste water described in claim 1, it is characterized in that, Cr in described chromate waste water
6+concentration is 10 ~ 50mg/L.
3., according to a kind of process for processing chromate-containing waste water described in claim 1, it is characterized in that, step 4) described in reductive agent be NaHSO
3.
4., according to a kind of process for processing chromate-containing waste water described in claim 1, it is characterized in that, step 4) in the mass volume ratio of reductive agent and chromate waste water be 40 ~ 50:1, g/L.
5., according to a kind of process for processing chromate-containing waste water described in claim 1, it is characterized in that, step 5) in the mass volume ratio of precipitation agent and chromate waste water be 20 ~ 30:1, g/L.
6., according to a kind of process for processing chromate-containing waste water described in claim 1 or 5, it is characterized in that, step 6) in precipitation agent be lime, NaOH or Na
2cO
3.
7., according to a kind of process for processing chromate-containing waste water described in claim 6, it is characterized in that, step 6) in precipitation agent be NaOH.
8., according to a kind of process for processing chromate-containing waste water described in claim 1, it is characterized in that, step 7) Cr in described waste liquid
6+content is 0.l ~ 0.5mg/L.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510721214.2A CN105236639A (en) | 2015-10-30 | 2015-10-30 | Chromium-containing wastewater treatment process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510721214.2A CN105236639A (en) | 2015-10-30 | 2015-10-30 | Chromium-containing wastewater treatment process |
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Family
ID=55034528
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106365347A (en) * | 2016-09-28 | 2017-02-01 | 江苏华兴电气科技有限公司 | Novel chromium-containing wastewater treatment device |
| CN109607908A (en) * | 2018-11-13 | 2019-04-12 | 长沙埃比林环保科技有限公司 | A kind of processing method of chromate waste water |
| CN111925018A (en) * | 2020-08-18 | 2020-11-13 | 宝钢湛江钢铁有限公司 | Chromium-containing coating waste liquid treatment method and system |
| CN112624401A (en) * | 2020-12-08 | 2021-04-09 | 泰州市惠明固废处置有限公司 | Chromium-containing waste liquid pretreatment process |
| CN114772857A (en) * | 2022-04-24 | 2022-07-22 | 上海聚丰热镀锌有限公司 | Chromium-containing waste liquid treatment process |
| CN115432890A (en) * | 2022-09-21 | 2022-12-06 | 无锡市道格环保科技有限公司 | Treatment device and method for reducing pollutant discharge in chromium-containing metal ion wastewater |
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|---|---|---|---|---|
| EP0637570A1 (en) * | 1993-02-11 | 1995-02-08 | Consejo Superior De Investigaciones Cientificas | Treatment of solid and liquid effluents from tan-yards for removing and recovering the chromium contained in the effluents |
| CN1556048A (en) * | 2004-01-12 | 2004-12-22 | 东风汽车紧固件有限公司 | Chromium containing waste water treatment method |
| CN101549925A (en) * | 2008-03-31 | 2009-10-07 | 吴秋波 | Method for electrolyzing and recovering hexavalent chrome in chromium-electroplating waste water |
| CN101633536A (en) * | 2008-07-21 | 2010-01-27 | 张通 | Method for treating small-size electroplating waste water |
| CN102070261A (en) * | 2009-11-24 | 2011-05-25 | 中国航空工业标准件制造有限责任公司 | Hexavalent chromium-containing waste water treatment method |
| CN202246306U (en) * | 2011-09-29 | 2012-05-30 | 常州豪邦纳米科技涂料有限公司 | Treatment system for chromate waste water |
-
2015
- 2015-10-30 CN CN201510721214.2A patent/CN105236639A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0637570A1 (en) * | 1993-02-11 | 1995-02-08 | Consejo Superior De Investigaciones Cientificas | Treatment of solid and liquid effluents from tan-yards for removing and recovering the chromium contained in the effluents |
| CN1556048A (en) * | 2004-01-12 | 2004-12-22 | 东风汽车紧固件有限公司 | Chromium containing waste water treatment method |
| CN101549925A (en) * | 2008-03-31 | 2009-10-07 | 吴秋波 | Method for electrolyzing and recovering hexavalent chrome in chromium-electroplating waste water |
| CN101633536A (en) * | 2008-07-21 | 2010-01-27 | 张通 | Method for treating small-size electroplating waste water |
| CN102070261A (en) * | 2009-11-24 | 2011-05-25 | 中国航空工业标准件制造有限责任公司 | Hexavalent chromium-containing waste water treatment method |
| CN202246306U (en) * | 2011-09-29 | 2012-05-30 | 常州豪邦纳米科技涂料有限公司 | Treatment system for chromate waste water |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106365347A (en) * | 2016-09-28 | 2017-02-01 | 江苏华兴电气科技有限公司 | Novel chromium-containing wastewater treatment device |
| CN109607908A (en) * | 2018-11-13 | 2019-04-12 | 长沙埃比林环保科技有限公司 | A kind of processing method of chromate waste water |
| CN111925018A (en) * | 2020-08-18 | 2020-11-13 | 宝钢湛江钢铁有限公司 | Chromium-containing coating waste liquid treatment method and system |
| CN112624401A (en) * | 2020-12-08 | 2021-04-09 | 泰州市惠明固废处置有限公司 | Chromium-containing waste liquid pretreatment process |
| CN114772857A (en) * | 2022-04-24 | 2022-07-22 | 上海聚丰热镀锌有限公司 | Chromium-containing waste liquid treatment process |
| CN115432890A (en) * | 2022-09-21 | 2022-12-06 | 无锡市道格环保科技有限公司 | Treatment device and method for reducing pollutant discharge in chromium-containing metal ion wastewater |
| CN115432890B (en) * | 2022-09-21 | 2024-01-23 | 无锡市道格环保科技有限公司 | Treatment device and method for reducing pollutant emission in chromium-containing metal ion wastewater |
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