CN107188278A - A kind of method of the nano-catalytic electrolytic experiment room containing hexavalent chromium wastewater - Google Patents
A kind of method of the nano-catalytic electrolytic experiment room containing hexavalent chromium wastewater Download PDFInfo
- Publication number
- CN107188278A CN107188278A CN201710580578.2A CN201710580578A CN107188278A CN 107188278 A CN107188278 A CN 107188278A CN 201710580578 A CN201710580578 A CN 201710580578A CN 107188278 A CN107188278 A CN 107188278A
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- China
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- nano
- wastewater
- hexavalent chromium
- catalytic
- experiment room
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
- C02F1/4676—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electroreduction
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46109—Electrodes
- C02F2001/46133—Electrodes characterised by the material
- C02F2001/46138—Electrodes comprising a substrate and a coating
- C02F2001/46142—Catalytic coating
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
Abstract
The invention belongs to field of waste water treatment, disclose a kind of method of the nano-catalytic electrolytic experiment room containing hexavalent chromium wastewater, methods described uses titanium base nano grade precious metal oxide coating anode, and chemism very strong free radical is produced in the case of energization, Cr VI is converted into trivalent chromium.Present device is made up of one piece of titanium base nano grade precious metal oxide coating pole plate, one piece of common titanium-based pole plate and dc source, the salinity that salt keeps certain is added in waste water, it is not necessary to add extra chemical reagent；Cr VI efficiently can be converted into trivalent chromium, conversion ratio reaches more than 99.5%, and to the well adapting to property of waste water of various conditions.Required voltage is smaller (6V or so), and energy consumption is smaller.
Description
Technical field
Contain hexavalent chromium wastewater side the invention belongs to field of waste water treatment, more particularly to a kind of nano-catalytic electrolytic experiment room
Method.
Background technology
At present, the extensive application due to chromium and compound in practice, a large amount of research laboratories of China can usually do with
The relevant Experimental Research of chromium its physico-chemical property, removal, toxicity test etc., if if laboratory containing hexavalent chromium wastewater without place
Reason, which is discharged, can then turn into the concentrated contaminated water source of a high concentration, therefore the Cr VI in laboratory waste water is also to be worth our to pay close attention to
A pollution sources.
At present, chemical reduction method, ion-exchange, membrane separation process, absorption are mainly included containing Cr (VI) method of wastewater treatment
Method, extraction etc., but these processing methods have certain limitation.Chemical reduction method is a kind of conventional method, still, place
Reason chromate waste water can produce the substantial amounts of sediment sludge for being difficult to processing, if bad to sediment Treatment of Sludge will produce secondary dirt
Dye.Ion exchange treatment process is complex, and cost is high, once invests big, floor space is big, can produce excessive regeneration
Waste liquid, process cycle is longer, the presence meeting contaminated ion exchanger resin of organic matter, discharges a large amount of brine wastes and easily causes pipeline rotten
Erosion, general applicability is poor, is only suitable in containing Cr (VI) concentration less high wastewater treatment process.Membrane separation process is current technically
It is also very unripe；And the cost of film is of a relatively high, using a period of time it need to be regenerated or is changed, operating cost compared with
Greatly.Absorption method need to consume a large amount of adsorbents, and equipment is huge, and the chromium ion handled is only that adsorbent is transferred to from waste water
In, the chromium ion desorption (regeneration of adsorbent) after absorption in adsorbent still suffers from certain technical difficulty.
In summary, the problem of prior art is present be：The above method will add during processing contains hexavalent chromium wastewater
Enter substantial amounts of medicament to be handled or regenerated, generate substantial amounts of solid waste (or dangerous waste), add the cost of processing.Laboratory contains
Chrome waste water can turn into the concentrated contaminated water source of high concentration if unprocessed discharge, lack now and a kind of hexavalent chromium wastewater is entered
The method of row simple and effective processing.
The content of the invention
The problem of existing for prior art, contains hexavalent chromium wastewater the invention provides a kind of nano-catalytic electrolytic experiment room
Method.
What the present invention was realized in：Using nano-catalytic electrolysis electrode, under certain voltage, Variation of Salinity Condition, produce
Hexavalent chromium, can be reduced into trivalent chromium, conversion ratio reaches more than 99% by the extremely strong free radical of activity；Due in electrolytic process
In only add the sodium chloride of a small amount of (3%), and environmental sound；Considerably reduce the chemistry examination consumed needed for other method
Agent, is a kind of method for governing pollution of environmental protection.
A kind of nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater, the nano-catalytic electrolytic experiment room contains Cr VI
Method for waste water uses titanium base nano grade precious metal oxide coating anode, produced in the case of energization chemism it is very strong from
By base, Cr VI is converted into trivalent chromium, the concentration of hexavalent chromium pollutant is reduced.
Further, the nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater, is specifically included：
Take Cr VI simulated wastewater：Take appropriate potassium bichromate to be configured to 100mg/L hexavalent chromium solution, then be diluted to concentration
10mg/L；
NaCl is added, certain voltage is kept；
Certain time is handled by nano-catalytic electrolysis, Cr VI is converted into trivalent chromium.
Further, Cr VI simulated wastewater is taken, is specifically included：
Take appropriate potassium bichromate in baking oven 120 DEG C dry 2 hours after, weigh 0.2829g, dissolved dilution is configured to 1L
100mg/L hexavalent chromium solution；200mL is taken to be diluted to 2L in 2L large beakers, Cr VI simulated wastewater concentration is 10mg/L.
Further, NaCl is added, addition is the 3% of wastewater volume, and holding voltage is 6V.
Further, handled 5 minutes by nano-catalytic electrolysis.
Another object of the present invention is to provide a kind of nano-catalytic electrolysis apparatus.
Advantages of the present invention and good effect are：This method analyzes nano-catalytic electrolytic experiment room chromate waste water, and its
The transformation efficiency and rule of middle Cr VI, while getting efficient chrome waste water processing method.This process equipment composition is simple, by
One piece of titanium base nano grade precious metal oxide coating pole plate, one piece of common titanium-based pole plate and electrolyzer power supply composition, by the nanometer
It should be creative that catalytic electrolysis instrument, which is applied to the processing containing hexavalent chromium wastewater,.During processing contains hexavalent chromium wastewater, no
Need to add that Cr VI just efficiently can be converted into trivalent chromium by extra reducing agent and waste water to various conditions has preferably
Adaptability.Required voltage is smaller (6V or so), and energy consumption is smaller.
The present invention analyzes salinity and there is influence on Cr VI nano-catalytic electrolysis effectiveness, constant in other influences factor
Under the conditions of, salinity is higher, and Cr VI conversion ratio is higher.
The change of voltage can cause the change of Cr VI conversion ratio, and Cr VI conversion is very fast when voltage is higher, conversion ratio compared with
Greatly.
With the progress of electrolytic process, the pH of chromate waste water has the trend of rising, and initial acidic chromium-containing wastewater electrolysis
When, pH can be comparatively fast risen to close to neutrality, then gradually become alkali.Relative to alkaline stoste, during the electrolysis of acid and weakly acidic pH stoste
Conversion is very fast, and electrolysis same time conversion ratio is larger.
Brief description of the drawings
Fig. 1 is the nano-catalytic electrolytic experiment room method flow diagram containing hexavalent chromium wastewater that the present invention implements to provide.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to
Limit the present invention.
Laboratory can turn into the concentrated contaminated water source of a high concentration containing hexavalent chromium wastewater if unprocessed discharge, existing to lack
A kind of weary method that simplicity is carried out to hexavalent chromium wastewater, effectively handled.
Below in conjunction with the accompanying drawings and specific embodiment to the present invention application principle be further described.
The nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater that the present invention implements to provide uses the expensive gold of titanium base nano grade
Belong to oxide coating anode, chemism very strong free radical can be produced in the case of energization：Such as Cl, H, O,
So as to reach the purpose of reduction pollutant concentration.
As shown in figure 1, the present invention implements the nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater provided including following
Step：
S101：Take Cr VI simulated wastewater：Take appropriate potassium bichromate in baking oven 120 DEG C dry 2 hours after, weigh
0.2829g, dissolved dilution to 1L is configured to 100mg/L hexavalent chromium solution；200mL is taken to be diluted to 2L in 2L large beakers,
Cr VI simulated wastewater concentration is 10mg/L.
S102：Holding voltage is 6V, adds NaCl, and addition is the 3% of wastewater volume.
S103：Handled 5 minutes by nano-catalytic electrolysis；Cr VI conversion ratio reaches 100%.
With reference to specific embodiment, the invention will be further described.
Cr VI simulated wastewater (10mg/L) 2L is prepared in laboratory, is handled different time by nano-catalytic electrolysis, is adopted
Determine Cr VI and total chromium concn in waste water respectively with AAS.Under the conditions of different salinity, decomposition voltage and initial pH
Analyze the changing rule of Cr VI conversion ratio.It is shown in Table 1,2,3.
Cr VI nano-catalytic electrolytic experiment data under the different salinity of table 1.
Cr VI nano-catalytic electrolytic experiment data under the conditions of the different decomposition voltages of table 2.
Cr VI nano-catalytic electrolytic experiment data under the conditions of the different initial pH of the stoste of table 3.
With reference to nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater, the invention will be further described.
Laboratory apparatus：Nano-catalytic electrolyzer power supply (TPR-3030D, Hong Kong dragon impressive and dignified manner instruments and meters Co., Ltd), nanometer
Catalytic electrolysis device (Xiamen Bo Ying Science and Technology Ltd.s), nano-catalytic electrolysis electrode plate dimensions：Length × wide=25cm × 10cm,
Plate spacing 1.5cm, ultraviolet-uisible spectrophotometer (UV-5200, Shanghai Yuan Xi Instrument Ltd.).
With reference to operating process, the invention will be further described.
1st, nano-catalytic is electrolysed the effect of Cr VI under the conditions of different salinity：
Take appropriate potassium bichromate in baking oven 120 DEG C dry 2 hours after, weigh 0.2829g, dissolved dilution is configured to 1L
100mg/L hexavalent chromium solution, takes 200mL to be diluted to 2L (concentration about 10mg/L) in 2L large beakers, and holding voltage is 5V,
Respectively in the case of 30g, 60g, 90g NaCl is added, different time is handled by nano-catalytic electrolysis, determined six in waste water
Valency chromium and total chromium concn, calculate Cr VI conversion ratio, as a result as follows：
The transformation efficiency of Cr VI under the conditions of the different salinity of table 4.
Under conditions of salinity is higher, its conversion ratio of nano-catalytic electrolysis Cr VI is higher, but surpasses adding NaCl mass
Cross conversion ratio after 60g and increase unobvious, so comprehensive choose 60g.
2nd, nano-catalytic is electrolysed the effect of Cr VI under different voltage conditions
Take appropriate potassium bichromate in baking oven 120 DEG C dry 2 hours after, weigh 0.2829g, dissolved dilution is configured to 1L
100mg/L hexavalent chromium solution, takes 200mL to be diluted to 2L (concentration about 10mg/L) in 2L large beakers, adds 60gNaCl.Point
Not under the conditions of voltage 3V, 4V, 6V, different time is handled by nano-catalytic electrolysis, Cr VI and total chromium in waste water is determined
Concentration, calculates Cr VI conversion ratio, as a result as follows：
The transformation efficiency of Cr VI under the different voltage conditions of table 5.
Under conditions of voltage is higher, its conversion ratio of nano-catalytic electrolysis Cr VI is higher, can comprehensive energy consumption and conversion ratio
Decision uses voltage.
3rd, nano-catalytic is electrolysed the effect of Cr VI under different voltage conditions
Take appropriate potassium bichromate in baking oven 120 DEG C dry 2 hours after, weigh 0.2829g, dissolved dilution is configured to 1L
100mg/L hexavalent chromium solution, takes 200mL to be diluted to 2L (concentration about 10mg/L) in 2L large beakers, adds 60gNaCl, stirs
It is 4,6,7,8,10 to mix the uniform pH value of solution of regulation respectively, keeps voltage 6V, different time is handled by nano-catalytic electrolysis, survey
Determine Cr VI and total chromium concn in waste water, calculate Cr VI conversion ratio, it is as a result as follows：
The transformation efficiency of Cr VI under the conditions of the different initial pH of table 6.
When the initial pH of solution is neutral or slant acidity, the conversion ratio of Cr VI is higher, again as can be seen that when pH is 4,6,7
Conversion ratio is more or less the same, when handling actual waste water, as long as it, which is rendered as neutral or acidity, all can directly carry out nano-catalytic electricity
Solution processing, without adjusting pH.
The equipment of the present invention is constituted simply, by one piece of titanium base nano grade precious metal oxide coating pole plate, one piece of common titanium
Base stage plate and electrolyzer power supply composition, it should be creative that the nano-catalytic electrolysis apparatus is applied into the processing containing hexavalent chromium wastewater
's.During processing contains hexavalent chromium wastewater, it is not necessary to which add extra reducing agent just efficiently can be converted into three by Cr VI
Valency chromium, and to the well adapting to property of waste water of various conditions.Required voltage is smaller (6V or so), and energy consumption is smaller.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (6)
1. a kind of nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater, it is characterised in that the nano-catalytic electrolytic experiment
Room method containing hexavalent chromium wastewater uses titanium base nano grade precious metal oxide coating anode, chemistry is produced in the case of energization living
Property very strong free radical, Cr VI is converted into trivalent chromium, the concentration of pollutant is reduced.
2. method of the nano-catalytic electrolytic experiment room containing hexavalent chromium wastewater as claimed in claim 1, it is characterised in that described to receive
Method of the rice catalytic electrolysis laboratory containing hexavalent chromium wastewater, is specifically included：
Prepare Cr VI simulated wastewater：Take potassium bichromate to be configured to 100mg/L hexavalent chromium solution, then be diluted to concentration 10mg/
L；
NaCl is added, certain voltage is kept；
Certain time is handled by nano-catalytic electrolysis, Cr VI is converted into trivalent chromium.
3. nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that prepare sexavalence
Chromium simulated wastewater, is specifically included：
Take appropriate potassium bichromate in baking oven 120 DEG C dry 2 hours after, weigh 0.2829g, dissolved dilution is configured to 1L
100mg/L hexavalent chromium solution；200mL is taken to be diluted to 2L in 2L large beakers, Cr VI simulated wastewater concentration is 10mg/L.
4. nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that keep voltage
For 6V, NaCl is added, addition is the 3% of wastewater volume.
5. method of the nano-catalytic electrolytic experiment room containing hexavalent chromium wastewater as claimed in claim 2, it is characterised in that by receiving
Rice catalytic electrolysis method is handled 5 minutes.
6. a kind of nano-catalytic electrolysis apparatus of nano-catalytic electrolytic experiment room method containing hexavalent chromium wastewater as claimed in claim 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109467227A (en) * | 2018-09-03 | 2019-03-15 | 集美大学 | The electrochemical treatments and recycling of electroplating acid copper waste water |
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2017
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Patent Citations (3)
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| CN101671066A (en) * | 2009-09-27 | 2010-03-17 | 东南大学 | Non-diaphragm electrochemical waste water treatment device |
| CN102887559A (en) * | 2011-07-21 | 2013-01-23 | 中国科学院生态环境研究中心 | Electrochemical reduction assistance-based biosorption integrated reactor and treatment method of hexavalent chromium-containing wastewater |
| CN106800356A (en) * | 2016-12-22 | 2017-06-06 | 波鹰(厦门)科技有限公司 | A kind of advanced treatment of wastewater regeneration device based on biochemical and electrolysis tech |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109467227A (en) * | 2018-09-03 | 2019-03-15 | 集美大学 | The electrochemical treatments and recycling of electroplating acid copper waste water |
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Application publication date: 20170922 |