CN103007909B - Recycling method of organic bentonite for organic wastewater treatment - Google Patents
Recycling method of organic bentonite for organic wastewater treatment Download PDFInfo
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- CN103007909B CN103007909B CN201210544825.0A CN201210544825A CN103007909B CN 103007909 B CN103007909 B CN 103007909B CN 201210544825 A CN201210544825 A CN 201210544825A CN 103007909 B CN103007909 B CN 103007909B
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Abstract
The invention discloses a recycling method of organic bentonite for organic wastewater treatment. The method comprises the steps of: putting the waste organic bentonite which adsorbs organic pollutants into a DC (Direct Current) electrolytic bath; adding methylbenzene, wherein the mass ratio of the methylbenzene to the waste organic bentonite is (1:0.1)-(1:0.8); adding a 10-20g/L sodium chloride solution, wherein the amount of the sodium chloride solution is 1/10-1/20 of that of the methylbenzene; applying direct current to the two poles of the electrolytic bath with electric potential gradient being 0.5-1V/cm; electrolyzing for 5-8 hours; stirring the mixture in the electrolytic bath at the rotation speed of 150-200 revolutions per minute during electroanalysis; carrying out precipitation and separation after the electroanalysis to obtain bentonite solid; distilling and condensing a liquid obtained after the separation of the bentonite solid to obtain methylbenzene and other organic matters; and applying electrode action on the organic bentonite to obtain the bentonite which can be used repeatedly. Wastewater treatment investment and secondary pollution caused by adsorption are reduced.
Description
Technical field
The present invention relates to environmental protection developing material technology, relate in particular to a kind of method that organobentonite is recycled.
Background technology
Bentonite is a kind of clay rock that montmorillonite is that essential mineral forms of take, and is one of nonmetallic minerals being most widely used.The architectural feature of montmorillonite is a kind of moisture layer aluminosilicate mineral, by aluminium of two silicon-oxy tetrahedron therebetween (magnesium) oxygen (hydrogen-oxygen) are octahedra, forms, and belongs to the three-layer clay mineral of 2:1 type.Distance between crystal layer is 0.96～2.14nm, and these nanoscale twins are stacked together, forms the clay particle that hundreds of nanometer arrives several microns, has the cation that can exchange between bentonite bed.
Organobentonite is to replace the exchangeable cationic type between layer in montmorillonite with organic cation (organic ammonium salt, quaternary ammonium salt etc.), thereby makes bentonite by hydrophilic oleophobic property, be changed into the organobentonite of lipophilic-hydrophobic property.Organobentonite is mainly as adsorbent in wastewater treatment, and the effect of removing organic pollutants is very good, as α in the bentonite adsorption treatment water with softex kw modification-, beta-naphthylamine, alpha-Naphthol, its clearance is all greater than 95%.Research shows that organobentonite absorption organic pollution is as suitable in performance and the active carbon of the pollutants such as polycyclic aromatic hydrocarbon, dyestuff, agricultural chemicals, but the defect of bentonite when wastewater treatment is: solid-liquid separation difficulty, recycling difficulty in waste water, cause substantially resting on the laboratory research stage in the application of polluting in controlling, seriously restrict its large-scale promotion application.
Summary of the invention
The present invention is for overcoming the deficiencies in the prior art, and a kind of method that provides organobentonite to recycle, can solve by the method the problem that organobentonite adsorption treatment organic wastewater after stain thing shifts, and reuse bentonite.
The technical solution used in the present invention is:
1) absorption there is is the discarded organobentonite of organic pollution insert in DC electrolysis groove, add toluene, toluene and discarded bentonite mass ratio are 1:0.1 ~ 1:0.8, adding concentration is the sodium chloride solution of 10 ~ 20g/L again, 1/10th to 1/20th of the amount that the amount of sodium chloride solution is toluene;
2) by the logical direct current in electrolytic cell the two poles of the earth, electric potential gradient is 0.5 ~ 1V/cm, electrolysis 5 ~ 8 h, and during electrolysis, to the in addition stirring of 150 ~ 200 revs/min of rotating speeds of the mixture in electrolytic cell, electrolysis completes postprecipitation separation, obtains bentonite solid;
3) by the liquid distillation, the condensation that obtain after separated bentonite solid, obtain toluene and other organic matters, toluene continues on for organobentonite and reclaims.
The invention has the beneficial effects as follows:
(1) by organobentonite by electrode effect, obtaining can reusable bentonite, the secondary pollution that has reduced wastewater treatment investment and produced by absorption.
(2) this process is simple, and energy consumption is low, and toluene used can be reused.
(3) can the organic matter being adsorbed is separated, as this organic matter has economic worth, can also produce economic benefit.
The specific embodiment
There is the discarded organobentonite of organic pollution to insert in DC electrolysis groove absorption, add toluene, toluene and discarded bentonite mass ratio are 1:0.1 ~ 1:0.8, adding a small amount of concentration is the sodium chloride solution of 10 ~ 20g/L again, the amount of sodium chloride solution be toluene amount 1/10th to 1/20th, by the logical direct current in electrolytic cell the two poles of the earth, electric potential gradient is 0.5 ~ 1V/cm, electrolysis 5 ~ 8 h, during electrolysis to the stirring of 150 ~ 200 revs/min of rotating speeds in addition of the mixture in electrolytic cell, after electrolysis completes, stop stirring, precipitate and separate, in this process, organic matter and surfactant are under the driving effect of electric field and the distributional effects of organic solution, and enter in toluene organic phase, in bentonite, the sodium of cation-bit in sodium chloride solution replaces, obtain bentonite solid.2) will after separated bentonite solid, obtain liquid, through distillation, condensation, can separation obtain toluene and other organic matters, wherein toluene can continue on for organobentonite recovery, and the surfactant obtaining in the solution after separation of methylbenzene can continue on for synthetic organobentonite after treatment.
Below by 3 embodiment, further illustrate the present invention:
Embodiment 1
There is the organobentonite of phenol to insert in DC electrolysis groove absorption, add toluene, toluene and discarded bentonite mass ratio are 1:0.8, adding a small amount of concentration is the sodium chloride solution of 20g/L, the amount of sodium chloride solution be toluene amount 1/20th, by the logical direct current in electrolytic cell the two poles of the earth, electric potential gradient is 1V/cm, electrolysis 8 h, during electrolysis to the stirring of 200 revs/min of rotating speeds in addition of the mixture in electrolytic cell, after electrolysis completes, stop stirring, precipitate and separate, in this process, organic matter and surfactant are under the driving effect of electric field and the distributional effects of organic solution, and enter in toluene organic phase, in bentonite, the sodium of cation-bit in sodium chloride solution replaces, obtain bentonite solid, to after separated bentonite, obtain liquid, through distillation, condensation, can separation obtain toluene and other organic matters, wherein toluene can continue on for organobentonite reuse, and the surfactant obtaining in the solution after separation of methylbenzene can continue on for synthetic organobentonite after treatment.
Organic carbon content in the bentonite that analysis obtains, phosphorus content is only 0.5%.Bentonite mixes with the surfactant obtaining again, adds suitable quantity of water to stir after 3h, and precipitate and separate, dries and make organobentonite, and by analysis, phosphorus content is 19.2%, can continue on for treatment of Organic Wastewater.
Embodiment 2
There is the organobentonite of nitrophenol to insert in DC electrolysis groove absorption, add toluene, toluene and discarded bentonite mass ratio are 1:0.1, adding a small amount of concentration is the sodium chloride solution of 10g/L, the amount of sodium chloride solution be toluene amount 1/10th ~ 1/20th, by the logical direct current in electrolytic cell the two poles of the earth, electric potential gradient is 0.5V/cm, electrolysis 5 h, during electrolysis to the stirring of 150 revs/min of rotating speeds in addition of the mixture in electrolytic cell, after electrolysis completes, stop stirring, precipitate and separate, in this process, organic matter and surfactant are under the driving effect of electric field and the distributional effects of organic solution, and enter in toluene organic phase, in bentonite, the sodium of cation-bit in sodium chloride solution replaces, obtain bentonite solid, to after separated bentonite, obtain liquid, through distillation, condensation, can separation obtain toluene and other organic matters, wherein toluene can continue on for organobentonite reuse, and the surfactant obtaining in the solution after separation of methylbenzene can continue on for synthetic organobentonite after treatment.
Organic carbon content in the bentonite that analysis obtains, phosphorus content is only 0.7%.Bentonite mixes with the surfactant obtaining again, adds suitable quantity of water to stir after 3h, and precipitate and separate, dries and make organobentonite, and by analysis, phosphorus content is 16.8%, can continue on for treatment of Organic Wastewater.
Embodiment 3
There is the organobentonite of para-nitrotoluene to insert in DC electrolysis groove absorption, add toluene, toluene and discarded bentonite mass ratio are 1:0.6, adding a small amount of concentration is the sodium chloride solution of 15g/L, the amount of sodium chloride solution be toluene amount 1/15th, by the logical direct current in electrolytic cell the two poles of the earth, electric potential gradient is 1V/cm, electrolysis 6 h, during electrolysis to the stirring of 180 revs/min of rotating speeds in addition of the mixture in electrolytic cell, after electrolysis completes, stop stirring, precipitate and separate, in this process, organic matter and surfactant are under the driving effect of electric field and the distributional effects of organic solution, and enter in toluene organic phase, in bentonite, the sodium of cation-bit in sodium chloride solution replaces, obtain bentonite solid, to after separated bentonite, obtain liquid, through distillation, condensation, can separation obtain toluene and other organic matters, wherein toluene can continue on for organobentonite reuse, and the surfactant obtaining in the solution after separation of methylbenzene can continue on for synthetic organobentonite after treatment.
Organic carbon content in the bentonite that analysis obtains, phosphorus content is only 0.9%.Bentonite mixes with the surfactant obtaining again, adds suitable quantity of water to stir after 3h, and precipitate and separate, dries and make organobentonite, and by analysis, phosphorus content is 21.5%, can continue on for treatment of Organic Wastewater.
Claims (1)
1. a method of recycling for the organobentonite for the treatment of of Organic Wastewater, is characterized in that comprising the steps:
1) absorption there is is the discarded organobentonite of organic pollution insert in DC electrolysis groove, add toluene, toluene and discarded bentonite mass ratio are 1:0.1 ~ 1:0.8, adding concentration is the sodium chloride solution of 10 ~ 20g/L again, 1/10th to 1/20th of the amount that the amount of sodium chloride solution is toluene;
2) by the logical direct current in electrolytic cell the two poles of the earth, electric potential gradient is 0.5 ~ 1V/cm, electrolysis 5 ~ 8 h, and during electrolysis, to the in addition stirring of 150 ~ 200 revs/min of rotating speeds of the mixture in electrolytic cell, electrolysis completes postprecipitation separation, obtains bentonite solid;
3) by the liquid distillation, the condensation that obtain after separated bentonite solid, obtain toluene and other organic matters, toluene continues on for organobentonite and reclaims.
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