CN101781050A - Method for treating low-concentration chromate waste water - Google Patents
Method for treating low-concentration chromate waste water Download PDFInfo
- Publication number
- CN101781050A CN101781050A CN 201010123069 CN201010123069A CN101781050A CN 101781050 A CN101781050 A CN 101781050A CN 201010123069 CN201010123069 CN 201010123069 CN 201010123069 A CN201010123069 A CN 201010123069A CN 101781050 A CN101781050 A CN 101781050A
- Authority
- CN
- China
- Prior art keywords
- waste water
- chromate waste
- value
- low
- concentration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Water Treatment By Sorption (AREA)
Abstract
The invention relates to a method for treating low-concentration chromate waste water, comprising the following steps of: drying bentonite after soaking in water, and sieving the bentonite by using a sieve with 100-240 meshes for later use; adding the bentonite in the chromate waste water, regulating the pH value to 2-3 by using acid and the stirring; adding aluminum polychloride in a solution with the regulated pH value and stirring; standing the mixed waste water, directly discharging supernatants after regulating the pH value to neutral by using alkali, and collecting precipitates, wherein the chromate waste water contains 0.1-10 mg of chromium in each liter of water; the bentonite has the added amount of 30 g-40 g in each liter of chromate waste water; and the aluminum polychloride has the added amount of 600-700 mg in each liter of chromate waste water. After being treated by the process, the removing rate of the chromium in the waste water can be greater than 97%, the Cr6+ion content in the water treated through the process is lower than the national discharge standard. The treating method has the advantages of simplicity, feasibility, convenience, low cost and obvious effect.
Description
Technical field
The invention belongs to technology of waste water control, be specifically related to the method that a kind of low-concentration chromate waste water is handled.
Background technology
Chromate waste water is mainly derived from the waste water of dischargings such as the processing, plating, printing and dyeing, leather, chemical industry, laboratory of chromium-containing ore.Chromium mainly exists with sexavalence and trivalent form in water, has very strong toxicity, and chromic toxicity is far longer than trivalent chromium, and it can pass through air, tap water, food or contact and invade human body, causes skin erosion, respiratory tract infection, anaemia even carcinogenesis is arranged.Cr and Hg, Cd, Pb and metalloid As are called as " five poisonous creatures: scorpion, viper, centipede, house lizard, toad ".Chromate waste water is discharged in the environment and can not degrades, and can only change form or shift accumulation, thereby serious to environmental hazard.
The method of handling chrome waste water at present comprises reduction precipitation method, electrolytic process, ion exchange method, active carbon adsorption and reverse osmosis method.Reduction precipitation method is present widely used chromate waste water treatment process, reductive agent commonly used comprises Sodium Pyrosulfite, S-WAT, sodium bisulfite, Sulfothiorine, ferrous sulfate, sulfurous gas etc., its ultimate principle is to add reductive agent under acidic conditions in waste water, hexavalent chrome reduction is become trivalent chromium, add lime or sodium hydroxide then, make it under alkaline condition, generate Cr (OH)
3Thereby precipitation is removed chromium ion; Gac has bigger surface-area, thereby the chromium in the absorption removal waste water can take place with the chromium in the waste water, obtains certain application because of it has advantages such as effect stability, floor space is little, equipment is simple; But since drawbacks limit such as gac costs an arm and a leg, poor selectivity, use range are limited, regeneration difficulty the practical application of this method.
Summary of the invention
The method that the object of the present invention is to provide a kind of low-concentration chromate waste water simple to operate, that cost is low to handle is to address the above problem.
Technical scheme of the present invention is: the method that low-concentration chromate waste water is handled, and it is after wilkinite is soaked in water, and is dry again, standby behind the 100-240 mesh sieve excessively; Described wilkinite is added in the chromate waste water, to 2-3, stirs with acid for adjusting pH value; Drop into polymerize aluminum chloride (PAC) in the solution after regulating the pH value, stir; Composite waste leaves standstill, and supernatant liquor is regulated the pH value to the directly discharging of neutral back, collecting precipitation thing with alkali; Described chromate waste water is the chromium that contains 0.1～10mg in every premium on currency; Described bentonitic input amount is: every liter of chromate waste water drops into 30g～40g wilkinite; The dosage of described polymerize aluminum chloride is: every liter of chromate waste water drops into the polymerize aluminum chloride of 600-700mg.
The present invention adopts wilkinite to handle low-concentration chromate waste water in conjunction with absorption-flocculation process of polymerize aluminum chloride PAC.Why select polymerize aluminum chloride PAC for use, be owing between wilkinite and the PAC good synergy is arranged---wilkinite has been strengthened the flocculation of PAC, and PAC has promoted bentonitic absorption.And add wilkinite and PAC separately and all can not obtain flco, order must be PAC behind the first wilkinite.If bentonitic words behind the first PAC, then action effect is not obvious.This treatment process simple possible, economy is convenient, with low cost, effect is obvious.The clearance of chromium can reach more than 97% in the waste water, by the Cr that contains in the water after this art breading
6+Ionic weight all is lower than the emission standard of country.
By wilkinite absorption and PAC flocculation associated treatment low-concentration chromate waste water, the difficult isolating problem of heavy metal ion solid-liquid when effectively solving the bentonite in treatment chromate waste water.The inventive method is simple to operate, suitability is wide, with low cost, effect is obvious, effectively solves low-concentration chromate waste water and handles difficult problem, handle in the drainage water of back by present method to contain Cr
+ 6Reach discharging standards, have bigger actual use value.
Embodiment
Embodiment 1
The chromate waste water of laboratory discharging, the chromium in the waste water are mainly from being equipped with related experiment solution or unreacted reagent completely, as measuring the used K of COD in the water
2Cr
2O
7Reagent.Containing chromium concn in the waste water is 2-5mg/L.
1, the 10h that earlier wilkinite is soaked in water, air-dry to constant weight after wash 3 times, mistake 100-240 mesh sieve, standby;
2, the wilkinite by 30g/L is added to above-mentioned containing in the waste water that chromium is 2-5mg/L in waste water, uses H
2SO4 regulates the pH value to 2-3, churning time 60min;
3, the polymerize aluminum chloride PAC that in the solution that step 2 obtains, adds 600mg/L, churning time 50-70 minute; Composite waste left standstill 30 minutes, and supernatant liquor is regulated the pH value to the directly discharging of neutral back, throw out collection and treatment with NaOH.
After this art breading, the clearance of chromium can reach more than 97% in the waste water, by the Cr that contains in the water after this art breading
6+Ionic weight all is lower than the emission standard of country.This treatment process simple possible, economy is convenient, with low cost, effect is obvious.
Comparing embodiment 2
In order to compare wilkinite and gac to chromic adsorption effect in the waste water, under all identical condition of pH value, stirring velocity and churning time, add wilkinite and powdered carbon processing waste water containing chrome in the 1.2g/100ml ratio respectively, its experimental result is as shown in table 1 below.Experimental result shows, when handling low-concentration chromate waste water, bentonitic treatment effect and activated carbon treatment effect are more or less the same, but the cost of gac is higher than organobentonite far away, and during single employing bentonite in treatment chromate waste water, the waste water after the processing can not reach the emission standard of country; Bentonitic treatment effect is better than gac when handling high-concentration waste water.In sum, during for processing waste water containing chrome, wilkinite is a kind of good sorbing material.
The effect of table 1 organobentonite and activated carbon treatment chromate waste water
Claims (5)
1. the method handled of a low-concentration chromate waste water, it is after wilkinite is soaked in water, and is dry again, crosses behind the 100-240 mesh sieve standby; Described wilkinite is added in the chromate waste water, to 2-3, stirs with acid for adjusting pH value; Drop into polymerize aluminum chloride in the solution after key joint pH value, stir; Composite waste leaves standstill, and supernatant liquor is regulated the pH value to the directly discharging of neutral back, collecting precipitation thing with alkali; Described chromate waste water is the chromium that contains 0.1～10mg in every premium on currency; Described bentonitic dosage is: every liter of chromate waste water drops into the wilkinite of 10g～40g; The input amount of described polymerize aluminum chloride is: every liter of chromate waste water drops into the polymerize aluminum chloride of 600-700mg.
2. the method handled of low-concentration chromate waste water according to claim 1 is characterized in that the time that described wilkinite original soil is soaked in water is 10 hours.
3. the method handled of low-concentration chromate waste water according to claim 1 is characterized in that selecting sulfuric acid or hydrochloric acid for use with acid for adjusting pH value; Regulate the pH value with alkali and select sodium hydroxide or yellow soda ash for use.
4. the method handled of low-concentration chromate waste water according to claim 1 is characterized in that using acid for adjusting pH value, and churning time is 40～90 minutes.
5. the method handled of low-concentration chromate waste water according to claim 1 is characterized in that dropping into polymerize aluminum chloride, and churning time is 50-70 minute.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010123069 CN101781050A (en) | 2010-03-09 | 2010-03-09 | Method for treating low-concentration chromate waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010123069 CN101781050A (en) | 2010-03-09 | 2010-03-09 | Method for treating low-concentration chromate waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101781050A true CN101781050A (en) | 2010-07-21 |
Family
ID=42521220
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010123069 Pending CN101781050A (en) | 2010-03-09 | 2010-03-09 | Method for treating low-concentration chromate waste water |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101781050A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102115276A (en) * | 2010-11-29 | 2011-07-06 | 东北大学 | Method for treating hexavalent chromium wastewater by utilizing blast furnace slag |
| CN102898515A (en) * | 2012-08-08 | 2013-01-30 | 上海交通大学 | Polybrominated biphenyls homologue immunogen and preparation method |
| CN104211211A (en) * | 2014-08-26 | 2014-12-17 | 苏州泓博环保科技有限公司 | Physicochemical pre-treatment method for electroplating waste liquor |
| CN104556342A (en) * | 2015-01-26 | 2015-04-29 | 东南大学 | Medicament for restoring hexavalent chromium contaminated soil and underground water and preparation method of medicament |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS555735A (en) * | 1978-06-30 | 1980-01-16 | Mitsubishi Heavy Ind Ltd | Treating method for waste water containing hexavalent chromium |
| DE4400982A1 (en) * | 1993-03-08 | 1994-09-15 | Lee Jong Chan | Compositions for treating wastewater containing heavy metals |
| CN1752048A (en) * | 2005-07-23 | 2006-03-29 | 桂林矿产地质研究院 | Modified bentonite chromium remover and its manufacturing method |
| CN1765804A (en) * | 2004-10-26 | 2006-05-03 | 上海申丰地质新技术应用研究所有限公司 | Sodium bentonite ore composite water disposal agent and its preparation method and uses |
-
2010
- 2010-03-09 CN CN 201010123069 patent/CN101781050A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS555735A (en) * | 1978-06-30 | 1980-01-16 | Mitsubishi Heavy Ind Ltd | Treating method for waste water containing hexavalent chromium |
| DE4400982A1 (en) * | 1993-03-08 | 1994-09-15 | Lee Jong Chan | Compositions for treating wastewater containing heavy metals |
| CN1765804A (en) * | 2004-10-26 | 2006-05-03 | 上海申丰地质新技术应用研究所有限公司 | Sodium bentonite ore composite water disposal agent and its preparation method and uses |
| CN1752048A (en) * | 2005-07-23 | 2006-03-29 | 桂林矿产地质研究院 | Modified bentonite chromium remover and its manufacturing method |
Non-Patent Citations (3)
| Title |
|---|
| 《污染防治技术》 19990630 赵晓明 等 改性膨润土去除水中Cr(VI)的实验研究 第12卷, 第2期 2 * |
| 《环境科学》 19941231 杭瑚 等 膨润土吸附－絮凝法处理废水中的有机染料 第15卷, 第1期 * |
| 《贵州环保科技》 19921231 杨昌力 等 钠基膨润土处理阳离子印染废水的应用研究 , 第1期 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102115276A (en) * | 2010-11-29 | 2011-07-06 | 东北大学 | Method for treating hexavalent chromium wastewater by utilizing blast furnace slag |
| CN102898515A (en) * | 2012-08-08 | 2013-01-30 | 上海交通大学 | Polybrominated biphenyls homologue immunogen and preparation method |
| CN104211211A (en) * | 2014-08-26 | 2014-12-17 | 苏州泓博环保科技有限公司 | Physicochemical pre-treatment method for electroplating waste liquor |
| CN104556342A (en) * | 2015-01-26 | 2015-04-29 | 东南大学 | Medicament for restoring hexavalent chromium contaminated soil and underground water and preparation method of medicament |
| CN104556342B (en) * | 2015-01-26 | 2016-06-01 | 东南大学 | The reparation medicament of hexavalent chromium polluted soil and underground water and preparation method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Kim et al. | Removal mechanism of heavy metal (Cu, Ni, Zn, and Cr) in the presence of cyanide during electrocoagulation using Fe and Al electrodes | |
| CN110818173B (en) | Comprehensive treatment method of electroplating mixed wastewater | |
| Guan et al. | Decomplexation and subsequent reductive removal of EDTA-chelated CuII by zero-valent iron coupled with a weak magnetic field: Performances and mechanisms | |
| Feng et al. | Mechanisms of Cr (VI) removal by FeCl3-modified lotus stem-based biochar (FeCl3@ LS-BC) using mass-balance and functional group expressions | |
| Gheju et al. | Removal of chromium from Cr (VI) polluted wastewaters by reduction with scrap iron and subsequent precipitation of resulted cations | |
| Li et al. | Reduction and immobilization of hexavalent chromium in chromite ore processing residue using amorphous FeS2 | |
| Li et al. | Selenite removal from groundwater by zero-valent iron (ZVI) in combination with oxidants | |
| Yehya et al. | Experimental analysis and modeling of denitrification using electrocoagulation process | |
| CN104192967B (en) | A kind of Ti 3c 2the application of nanometer sheet high oxidative toxic metal ions in process water | |
| CN103739118A (en) | Treatment method for analyzing waste liquid | |
| Liu et al. | Removal of recalcitrant trivalent chromium complexes from industrial wastewater under strict discharge standards | |
| CN103011347B (en) | Method for carrying out electrolytic treatment on copper-containing electroplating wastewater and recycling copper | |
| CN108996642A (en) | A kind of processing method of chlorine-contained wastewater | |
| CN101781050A (en) | Method for treating low-concentration chromate waste water | |
| Bowers et al. | Iron process for treatment of Cr (VI) wastewaters | |
| CN103626340B (en) | Treatment method for water of molybdenum-containing water source | |
| Fabbricino et al. | Chromium removal from tannery wastewater using ground shrimp shells | |
| Kumar et al. | Removal of chromium from water effluent by adsorption onto Vetiveria zizanioides and Anabaena species | |
| Vaishya et al. | Coated sand filtration: An emerging technology for water treatment | |
| Zuo et al. | Preparation of activated carbon fibers rich in S/N/O adsorption sites for selective and efficient trace Pb (II) removal from drinking water | |
| CN110981018B (en) | Method for treating electroplating wastewater of potassium chloride cadmium cobalt alloy | |
| US20210230029A1 (en) | Method for Removing Heavy Metal Pollutants in Water with Divalent Manganese Strengthened Ferrate | |
| CN102531094A (en) | Treatment method of wastewater containing heavy metal ions or phosphorus | |
| CN104787935B (en) | A kind of processing method of fluoride waste | |
| JP6208648B2 (en) | Treatment agent and treatment method for contaminated water or soil |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20100721 |