CN104291415A - Method for treating rolling emulsification wastewater through electrocoagulation - Google Patents
Method for treating rolling emulsification wastewater through electrocoagulation Download PDFInfo
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- CN104291415A CN104291415A CN201410523660.8A CN201410523660A CN104291415A CN 104291415 A CN104291415 A CN 104291415A CN 201410523660 A CN201410523660 A CN 201410523660A CN 104291415 A CN104291415 A CN 104291415A
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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
- C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
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Abstract
The invention relates to a method for treating rolling emulsification wastewater through electrocoagulation, belonging to the field of wastewater treatment methods. The method for treating rolling emulsification wastewater through electrocoagulation comprises the following steps: filtering rolling emulsification wastewater, pumping into an electrolytic bath, adding electrolyte sodium chloride into the electrolytic bath, adjusting the pH value of the wastewater to be 5.5-6.5, electrifying the electrolytic bath, after the electrolysis reaction, standing to precipitate for 1 hour, subsequently wiping off suspension oil on the liquid level, and discharging the supernate, that is, the treated effluent. According to the method for treating rolling emulsification wastewater through electrocoagulation, an electrocoagulation method is adopted to treat the rolling emulsification wastewater, the demulsification effect is superior to that of a chemical flocculation method under optimal conditions, the COD removal rate of the wastewater is up to 99.5%, the turbidity removal rate is 99.6%, and the method has the advantages of easiness in operation, automation achievement and the like.
Description
Technical field
The present invention relates to a kind of method of Treatment of Oil/Water Emulsion by Electrolytic Flocculation, belong to method of wastewater treatment field.
Background technology
When metal cutting processing, rolling, oil-containing emulsifying water can be produced, mainly contain mineral oil, emulsifying agent in waste water, overstock the components such as wear-resistant rust-preventive agent, due to the oil-contg of waste water and COD value all very high, the surface-active action of exhibiting high surface promoting agent in addition, makes the emulsifying stability of waste water very high again, therefore such waste water is more difficult, if directly discharged without process, this type of waste water meeting severe contamination surface water body and underground water source, destroy ecotope.Electrocoagulation is also known as electricity flocculation or electro-flotation, electrolysis principle is mainly utilized to carry out electrochemical treatment to waste water, the feature of electrocoagulation uses soluble anode (i.e. sacrificial electrode), pass through electrochemical reaction, both the bubble needed for dissolved air flotation had been produced, also produce the flocculation agent that suspended substance is condensed, and some oxygenants can be produced in treating processes, the effect of organics removal can be reached.
Summary of the invention
The present invention aims to provide one and utilizes Treatment of Oil/Water Emulsion by Electrolytic Flocculation, the method that treatment effect is good, operation is simple and cost is low.
The method of Treatment of Oil/Water Emulsion by Electrolytic Flocculation of the present invention, comprises the following steps:
Pump in electrolyzer after rolling emulsifying waste water is filtered, add electrolyte sodium chloride to electrolyzer simultaneously, and regulate waste water pH value to 5.5-6.5, be energized in electrolyzer, after electrolytic reaction, struck off by the suspension oil on liquid level after staticly settling 1h, the supernatant water of discharge is the draining handled well.
Preferably, sodium-chlor add-on of the present invention is 1.25g/L, and it is 6.0 that waste water pH value is adjusted to.
Preferred, Faradaic current intensity of the present invention is 4mA/cm2, and electrolysis time is 40min.
Preferred further, the electroplax of electrolyzer of the present invention is the aluminium sheet of surface-area 116cm2, and spacing is 1cm, and positive and negative pole plate is spaced distribution many groups in a cell.
In method of the present invention, adopt electrocoagulation to process rolling emulsifying waste water, the factor affecting treatment effect mainly contains waste water pH value, strength of current and electrolysis time, sodium-chlor consumption and polar plate spacing etc.Wherein, because oil in water emulsion is electronegativity, its iso-electric point is 2.0, as wastewater pH < 6.0, electrocoagulation has good treatment effect to it, in the emulsion that rolling industry is formed, oil in water emulsion concentration is 1%-2.5%, corresponding turbidity is between 15000-40000NTU, this high-concentration emulsified oil wastewater carries a large amount of negative charge, to need in high electric charge positively charged ion and just can breakdown of emulsion, in acid range, the existing forms mainly Al3+ of aluminium in water of anodic stripping, Al (OH) 2+ and Al8 (OH) 24+ etc., emulsion can be made to take off steady breakdown of emulsion, be neutralized electrical emulsification oil droplet gathering to become greatly, under the effect of the microbubble produced in natural buoyancy and electrolysis, rise to the water surface, profit is separated, during pH > 6.0, the hydrolysate mainly Al (OH) 3 of aluminium, the multinuclear hydroxo complex of Al (OH) 4-and long molecular chain, their effect is mainly adsorbed and sweep coagulation, and these effects cannot occur for not de-steady oil in water emulsion, therefore oil removing rate declines, so waste water ph is adjusted to 6.0 for best pH value.
In method of the present invention, in 1mA/cm2 to 4mA/cm2 scope on the impact of turbidity removal rate clearly, current density is more than after 4mA/cm2, and turbidity removal rate almost remains unchanged for current density, for energy efficient, method choice current density of the present invention is 4mA/cm2.Along with the increase turbidity removal rate of electrolysis time also increases, during 40min, turbidity removal rate can reach 99.1%, and continuing increases electrolysis time, and the change of turbidity removal rate is very little, and electrolysis time is longer, and energy consumption is larger, and comprehensive treatment effect and energy consumption, electrolysis time is decided to be 40min.
In method of the present invention, during sodium-chlor dosage < 1.25g/L, turbidity removal rate increases with the increase of dosage, when the dosage of sodium-chlor is 1.25g/L, effect is best, turbidity removal rate is up to 99.6%, when continuing the dosage increasing sodium-chlor, removal effect can be deteriorated on the contrary, why can produce such phenomenon is because (1) sodium-chlor can produce ClO-in reactive tank, a certain amount of ClO-can help the organism in oxidizing water, but its amount can cause a part can form the superpolymer chain rupture of big flocculating body time excessive, reduce flocculating effect on the contrary, (2) sodium-chlor can increase useless electrical conductivity of water, but when specific conductivity is excessive, current leakage rate is also large, thus directly affect current density and treatment effect, the dosage of sodium-chlor also can affect voltage, finds in experiment, when electric current is constant voltage along with the increase of sodium-chlor throwing amount more and more less, this is because sodium-chlor can increase useless electrical conductivity of water, and the resistance drop of waste water declines.Therefore, when with electrocoagulation process waste water, appropriate sodium-chlor can be added to reduce energy consumption in waste water.
In method of the present invention, the size of distance between plates on the impact of flocculating effect clearly, along with distance between plates reduces, turbidity removal rate improves, this is due to polar plate spacing hour, the aluminium hydroxide mixture of anodic formation has also flotated by the powerful air supporting effect of the bubble that cathodic area is formed, and then anode aluminium dissolves further, accelerate the formation of metal and solution interface compound, but pole span too little Yi cause short circuit, simultaneously may bring blocking, the problems such as the flowing of reactive tank current is bad, therefore, in method of the present invention, polar plate spacing is decided to be 1cm.
The method of Treatment of Oil/Water Emulsion by Electrolytic Flocculation of the present invention, electrocoagulation is adopted to process rolling emulsifying waste water, under described top condition, demulsification is better than chemical flocculation, the COD clearance of waste water reaches 99.5%, turbidity removal rate reaches 99.6%, and has easy handling and realize the advantages such as automatization.
Embodiment
Embodiment one:
By pumping in electrolyzer after the filtration of rolling emulsifying waste water, (electroplax of electrolyzer is the aluminium sheet of surface-area 116cm2, spacing is 1cm, positive and negative pole plate is spaced distribution many groups in a cell), add the electrolyte sodium chloride of 1.25g/L to electrolyzer simultaneously, and regulate waste water pH value to 6.0, in electrolyzer, pass into the direct current that strength of current is 4mA/cm2, after electrolytic reaction 40min, struck off by suspension oil on liquid level after staticly settling 1h, the supernatant water of discharge is the draining handled well.
Embodiment two: treatment effect
Use the method for Treatment of Oil/Water Emulsion by Electrolytic Flocculation of the present invention, process certain rolling emulsifying waste water, compare with chemical flocculation, treatment effect as shown in Table-1 simultaneously.
Table-1 treatment effect
Can find out from table-1, electrocoagulation treatment effect of the present invention is better than chemical flocculation, and the COD clearance of waste water reaches 99.5%, and turbidity removal rate reaches 99.6%.Reason may be that the nascent state polymerize aluminum chloride flocculating effect that (1) electrolysis produces is better, and the ClO-oxygenant that (2) electrode reaction produces can play the effect of oxidation of organic compounds.
Claims (4)
1. the method for Treatment of Oil/Water Emulsion by Electrolytic Flocculation, comprises the following steps:
Pump in electrolyzer after rolling emulsifying waste water is filtered, add electrolyte sodium chloride to electrolyzer simultaneously, and regulate waste water pH value to 5.5-6.5, be energized in electrolyzer, after electrolytic reaction, struck off by the suspension oil on liquid level after staticly settling 1h, the supernatant water of discharge is the draining handled well.
2. the method for Treatment of Oil/Water Emulsion by Electrolytic Flocculation as claimed in claim 1, it is characterized in that described sodium-chlor add-on is 1.25g/L, it is 6.0 that waste water pH value is adjusted to.
3. the method for Treatment of Oil/Water Emulsion by Electrolytic Flocculation as claimed in claim 1, it is characterized in that described Faradaic current intensity is 4mA/cm2, electrolysis time is 40min.
4. the method for Treatment of Oil/Water Emulsion by Electrolytic Flocculation as claimed in claim 1, it is characterized in that the electroplax of described electrolyzer is the aluminium sheet of surface-area 116cm2, spacing is 1cm, and positive and negative pole plate is spaced distribution many groups in a cell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410523660.8A CN104291415A (en) | 2014-10-08 | 2014-10-08 | Method for treating rolling emulsification wastewater through electrocoagulation |
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| CN201410523660.8A CN104291415A (en) | 2014-10-08 | 2014-10-08 | Method for treating rolling emulsification wastewater through electrocoagulation |
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| CN104291415A true CN104291415A (en) | 2015-01-21 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698762A (en) * | 2017-01-16 | 2017-05-24 | 陕西省石油化工研究设计院 | Latex paint waste water pre-treating device |
| CN107473527A (en) * | 2017-09-29 | 2017-12-15 | 华北水利水电大学 | A kind of method of Treatment of Oil/Water Emulsion by Electrolytic Flocculation |
| CN110117121A (en) * | 2019-05-14 | 2019-08-13 | 吉林建筑大学 | A kind of processing method of the waste water containing size |
| CN110342700A (en) * | 2019-05-06 | 2019-10-18 | 苏州久沛环保科技有限公司 | In conjunction with the waste emulsified mixture treatment process of ultrasonic wave and electrocoagulation |
| CN112194290A (en) * | 2020-06-30 | 2021-01-08 | 广州中科建禹环保有限公司 | Physicochemical treatment system and method for cosmetic production waste liquid |
| CN112687972A (en) * | 2020-12-25 | 2021-04-20 | 广东莞绿环保工程有限公司 | System and method for treating and recovering cobalt in lithium battery waste liquid |
| CN112759040A (en) * | 2020-12-02 | 2021-05-07 | 北京中科圣泰环境科技有限公司 | Composite electric flocculant and method for treating cold-rolling emulsion wastewater through electric flocculation |
| WO2022186877A3 (en) * | 2021-03-02 | 2022-10-20 | Phosphorus Free Water Solutions, Llc | Galvanic process for treating aqueous compositions |
-
2014
- 2014-10-08 CN CN201410523660.8A patent/CN104291415A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106698762A (en) * | 2017-01-16 | 2017-05-24 | 陕西省石油化工研究设计院 | Latex paint waste water pre-treating device |
| CN106698762B (en) * | 2017-01-16 | 2023-07-04 | 陕西省石油化工研究设计院 | Emulsion paint wastewater pretreatment device |
| CN107473527A (en) * | 2017-09-29 | 2017-12-15 | 华北水利水电大学 | A kind of method of Treatment of Oil/Water Emulsion by Electrolytic Flocculation |
| CN110342700A (en) * | 2019-05-06 | 2019-10-18 | 苏州久沛环保科技有限公司 | In conjunction with the waste emulsified mixture treatment process of ultrasonic wave and electrocoagulation |
| CN110117121A (en) * | 2019-05-14 | 2019-08-13 | 吉林建筑大学 | A kind of processing method of the waste water containing size |
| CN112194290A (en) * | 2020-06-30 | 2021-01-08 | 广州中科建禹环保有限公司 | Physicochemical treatment system and method for cosmetic production waste liquid |
| CN112759040A (en) * | 2020-12-02 | 2021-05-07 | 北京中科圣泰环境科技有限公司 | Composite electric flocculant and method for treating cold-rolling emulsion wastewater through electric flocculation |
| CN112759040B (en) * | 2020-12-02 | 2023-01-06 | 北京中科圣泰环境科技有限公司 | Composite electric flocculant and method for treating cold-rolling emulsion wastewater through electric flocculation |
| CN112687972A (en) * | 2020-12-25 | 2021-04-20 | 广东莞绿环保工程有限公司 | System and method for treating and recovering cobalt in lithium battery waste liquid |
| WO2022186877A3 (en) * | 2021-03-02 | 2022-10-20 | Phosphorus Free Water Solutions, Llc | Galvanic process for treating aqueous compositions |
| CN117203166A (en) * | 2021-03-02 | 2023-12-08 | 努夸蒂克有限责任公司 | Galvanic process for treating aqueous compositions |
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