CN102531142A - Method for treating chromium-containing waste water by utilizing banana skin - Google Patents
Method for treating chromium-containing waste water by utilizing banana skin Download PDFInfo
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Abstract
The invention relates to a method for treating chromium-containing waste water by utilizing banana skin. Banana skin powder is washed and dried and then is mixed with a solidified liquid, and a Cacl2 solution is added to form a mixture, so as to prepare particles; the particles are added into the Cacl2 solution, standing is carried out for 12 hours, the particles are taken out and washed for twice, filtering and drying are carried out, the prepared reduction adsorbent is uniformly mixed with the chromium-containing waste water, wherein the mass ratio of hexavalent chromium to the reduction adsorbent in the waste water is 1:200, the pH value is regulated to 4, and reaction is carried out for 4-6 hours; reacted waste water is fed into a centrifugal machine; the concentration of hexavalent chromium ions in centrifuged supernate is less than 0.5mg/L, the total chromium ion concentration is less than 1.5mg/L, the precipitate after centrifugation is uniformly mixed with hydrochloric acid, the mixture is fed into an oscillator, desorption is carried out for 4-6 hours, the desorbed mixed solution is fed into the centrifugal machine, and separation is carried out to obtain a trivalent chromium ion solution and a waste reduction adsorbent. The method provided by the invention has the advantages of low cost, good treatment effect, simple process, mild reaction condition, capability of recycling trivalent chromium, less secondary pollution, and the like.
Description
Technical field
The present invention relates to a kind of method of wastewater treatment, utilize the method for Pericarpium Musae processing waste water containing chrome specifically.
Background technology
At metallurgy, to electroplate, printing and dyeing all can produce a large amount of chromate waste waters in the Industrial processes such as process hides, and the principal pollutant in these waste water are sexavalent chrome.Sexavalent chrome is very harmful to HUMAN HEALTH; Can make the oxyphorase of human body change methemoglobin into, disturb intravital oxidation, reduction and hydrolytic process, digestive tube, respiratory tract, skin and mucous membrane etc. are had serious harm; Under certain condition even can bring out cancer; For a pollutant of " integrated wastewater discharge standard " GB8978-1996 defined, must handle, could discharge after up to standard.The main method of both at home and abroad chromate waste water being handled at present has: chemical reduction method, electrolytic process, membrane separation process, absorption method, ion exchange method, biological process etc.Wherein chemical reduction method, treatment effect big because of its treatment capacity is widely used well, and its technology can be divided into 2 stages.At first under the strong acidic condition of pH 0.5-3, with chemical reducing agent (like ferrous sulfate FeSO
47H
2O, sodium sulfite anhy 96 NaHSO
3, Sodium Pyrosulfite Na
2S
2O
5Deng) become the lower trivalent chromium of toxicity to the very big hexavalent chrome reduction of waste water toxic; The pH value of regulating waste water then is to alkalescence, and the trivalent chromium conversion that makes generation is chromium hydroxide Cr (OH)
3The deposition and remove.Though chemical reduction method is good to the chromate waste water treatment effect, complex process needs to consume a large amount of chemical reagent, and these chemical reagent are expensive, increased production cost, and cause secondary pollution easily.
Summary of the invention
The present invention is directed to the deficiency of the problems referred to above, a kind of method of utilizing the Pericarpium Musae processing waste water containing chrome is provided, its technology is simple, easy to operate, and is with low cost.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
Step 1, get the Pericarpium Musae powder that a certain amount of particle diameter is 0.1-0.5cm, with sending into behind the deionized water wash 2 times in 105 ℃ the drying baker, oven dry is cooled to room temperature, and is subsequent use;
Step 2, to get in the 5-20g step 1 Pericarpium Musae powder and 50-200mL concentration after the oven dry be that (the solid solution composition is a sodium-alginate for 2% solid solution; Gelatin; In the chitosan one or more) mix, form mixed solution, after mixed solution is added the Cacl that 50-200mL concentration is 0.1mol/L
2In the solution, mix, form mixture, after mixture is processed the particle of 2-5mm, subsequent use;
Step 3, be that the compound particles of 2-5mm all adds the Cacl that 50-200mL concentration is 0.1mol/L with particle diameter in the step 2
2In the solution, left standstill 12 hours, take out the back, and with deionized water wash 2 times, filtration, drying makes the reduction sorbent material, and is subsequent use;
Step 4, the reduction sorbent material and the chromate waste water that make in the step 3 are mixed (in the waste water sexavalent chrome with the reduction sorbent material mass ratio be 1:200); Regulating pH value to 4, is 25 ℃ in temperature afterwards, and mixing speed is under 200-250 rev/mins the condition; Reacted 4-6 hours, subsequent use;
Step 5, the step 4 reacted wastewater is sent in the whizzer, with under 1500 rev/mins the rotating speed centrifugal 10 minutes.Hexavalent chromium and total chromium ion concentration have all been reduced under the GB (Cr (VI) in the draining of " integrated wastewater discharge standard " /> GB8978-1996 regulation < 0.5 mg/>L and total Cr < 1.5 mgL) in its supernatant, obtain containing chromic throw out, and is subsequent use;
Step 6, to get the mixed in hydrochloric acid that whole throw outs of obtaining in the step 5 and 50-200mL concentration is 1mol/L even; After send in the vibrator, under 50-100 rev/mins rotating speed, desorb 4-6 hours; After will contain chromic desorb mixed solution and send in the whizzer; With 1500 rev/mins rotating speed centrifugal 10 minutes, separate, obtain the solution and useless reduction sorbent material of trivalent chromic ion.
Beneficial effect
Find to contain in the Pericarpium Musae a large amount of reducing substanceses such as reductibility polysaccharide, polyphenol etc. after deliberation, sexavalent chrome is had good reducing power, its chromic reducing power is higher 4 times than ferrous sulfate, is reductive agent preferably.Discover simultaneously and also contain a large amount of hydroxyls in the Pericarpium Musae, carboxyl group is the trivalent chromium in the planar water efficiently, so Pericarpium Musae has reduction of hexavalent chromium and the chromic double effects of absorption.But if directly utilize Pericarpium Musae powder processing waste water containing chrome following 2 problems can occur: (1) Pericarpium Musae powder footpath is little, and quality is light, is difficult to after the use from waste water, separate.(2) the Pericarpium Musae powder can discharge the secondary pollution that some dissolved organic matters cause water body as a kind of natural materials in water.We find if adopt solidifying agent that the Pericarpium Musae powder is wrapped up curing in the experiment; Be prepared into spherical small-particle and can well solve the organic problem of Pericarpium Musae powder release soluble in waste water; Before burst size after the curing is merely and solidifies 3%, and can easily this spherical small-particle be separated from waste water through centrifugation method.
That the reduction sorbent treatment chromate waste water that utilizes Pericarpium Musae to be prepared into has is with low cost, treatment effect good, technology is simple (has accomplished chromic reduction and chromic absorption in a reactor drum; Omitted chemical reduction method and needed the chromic technology of alkaline chemical precipitation); Advantages such as reaction conditions gentle (pH 4) can reclaim trivalent chromium, and secondary pollution is little; The improvement that can be chromate waste water provides a new outlet, has suitable economy, society and environmental benefit.
Embodiment
Utilize the method for Pericarpium Musae processing waste water containing chrome to be:
Step 1, get the Pericarpium Musae powder that a certain amount of particle diameter is 0.1-0.5cm, with sending into behind the deionized water wash 2 times in 105 ℃ the drying baker, oven dry is cooled to room temperature, and is subsequent use;
Step 2, to get in the 5-20g step 1 Pericarpium Musae powder and 50-200mL concentration after the oven dry be that (the solid solution composition is a sodium-alginate for 2% solid solution; Gelatin; In the chitosan one or more) mix, form mixed solution, after mixed solution is added the Cacl that 50-200mL concentration is 0.1mol/L
2In the solution, mix, form mixture, after mixture is processed the particle of 2-5mm, subsequent use;
Step 3, be that the compound particles of 2-5mm all adds the Cacl that 50-200mL concentration is 0.1mol/L with particle diameter in the step 2
2In the solution, left standstill 12 hours, take out the back, and with deionized water wash 2 times, filtration, drying makes the reduction sorbent material, and is subsequent use;
Step 4, the reduction sorbent material and the chromate waste water that make in the step 3 are mixed (in the waste water sexavalent chrome with the reduction sorbent material mass ratio be 1:200); Regulating pH value to 4, is 25 ℃ in temperature afterwards, and mixing speed is under 200-250 rev/mins the condition; Reacted 4-6 hours, subsequent use;
Step 5, the step 4 reacted wastewater is sent in the whizzer, with under 1500 rev/mins the rotating speed centrifugal 10 minutes.Hexavalent chromium and total chromium ion concentration have all been reduced under the GB (Cr (VI) in the draining of " integrated wastewater discharge standard " /> GB8978-1996 regulation < 0.5 mg/>L and total Cr < 1.5 mgL) in its supernatant, obtain containing chromic throw out, and is subsequent use;
Step 6, to get the mixed in hydrochloric acid that whole throw outs of obtaining in the step 5 and 50-200mL concentration is 1mol/L even; After send in the vibrator, under 50-100 rev/mins rotating speed, desorb 4-6 hours; After will contain chromic desorb mixed solution and send in the whizzer; With 1500 rev/mins rotating speed centrifugal 10 minutes, separate, obtain the solution and useless reduction sorbent material of trivalent chromic ion.
Below through three concrete embodiment technical scheme of the present invention is described further:
Embodiment one
Step 1, get the Pericarpium Musae powder that a certain amount of particle diameter is 0.1cm, with sending into behind the deionized water wash 2 times in 105 ℃ the drying baker, oven dry is cooled to room temperature, and is subsequent use then;
Step 2, to get in the 5g step 1 Pericarpium Musae powder and 50mL concentration after the oven dry be 2% solid solution (gelatin and chitosan), mixes, and forms mixed solution, after mixed solution is added the Cacl that 50mL concentration is 0.1mol/L
2In the solution, mix, form mixture, after mixture is processed the particle of 2mm, subsequent use;
Step 3, be that the compound particles of 2mm all adds the Cacl that 50mL concentration is 0.1mol/L with particle diameter in the step 2
2In the solution, left standstill 12 hours, take out the back, and with deionized water wash 2 times, filtration, drying makes the reduction sorbent material, and is subsequent use;
Step 4, getting reduction sorbent material and the 500mL concentration that the 5g step 3 makes and mix for the 50mg/L chromate waste water, regulate pH value to 4, is 25 ℃ in temperature afterwards, and rotating speed is under 200 rev/mins the condition, to react 4 hours.Under the effect of reduction sorbent material, the sexavalent chrome in the waste water is reduced to trivalent chromium, and trivalent chromium is adsorbed by it then;
Step 5, the step 4 reacted wastewater is sent in the whizzer; With 1500 rev/mins rotating speed centrifugal 10 minutes; Supernatant is carried out the chromium content detection, record that chromic content is 0.38mg/L in the waste water, total chrome content is that 1.41mg/L has all reduced under the GB; Obtain containing chromic throw out, subsequent use;
Step 6, to get the mixed in hydrochloric acid that whole throw outs of obtaining in the step 5 and 50mL concentration is 1mol/L even, after send in the vibrator, with 50 rev/mins; Desorb 4 hours (chromic desorption efficiency is measured as 84%); After will contain chromic desorb mixed solution and send in the whizzer, with 1500 rev/mins rotating speed centrifugal 10 minutes, separate; Obtain the solution and useless reduction sorbent material of trivalent chromic ion, the solution of trivalent chromic ion (is mainly CrCl
36H
2O) can be used as and produce chromic salts or manufacturing contains purposes such as chrome pigment, and useless reduction sorbent material can be used as general refuse and carries out treatment and disposal.
Embodiment two
Step 1, get the Pericarpium Musae powder that a certain amount of particle diameter is 0.3cm, with sending into behind the deionized water wash 2 times in 105 ℃ the drying baker, oven dry is cooled to room temperature, and is subsequent use then;
Step 2, to get in the 10g step 1 Pericarpium Musae powder and 100mL concentration after the oven dry be 2% solid solution (gelatin and sodium-alginate), mixes, and forms mixed solution, after mixed solution is added the Cacl that 100mL concentration is 0.1mol/L
2In the solution, mix, form mixture, after mixture is processed the particle of 4mm, subsequent use;
Step 3, be that the compound particles of 4mm all adds the Cacl that 100mL concentration is 0.1mol/L with particle diameter in the step 2
2In the solution, left standstill 12 hours, take out the back, and with deionized water wash 2 times, filtration, drying makes the reduction sorbent material, and is subsequent use;
Step 4, getting reduction sorbent material and the 500mL concentration that 10g step 3 makes and mix for the 100mg/L chromate waste water, regulate pH value to 4, is 25 ℃ in temperature afterwards, and rotating speed is under 230 rev/mins the condition, to react 5 hours.Under the effect of reduction sorbent material, the sexavalent chrome in the waste water is reduced to trivalent chromium, and trivalent chromium is adsorbed by it then;
Step 5, the step 4 reacted wastewater is sent in the whizzer; With 1500 rev/mins rotating speed centrifugal 10 minutes; Supernatant is carried out the chromium content detection, record that chromic content is 0.32mg/L in the waste water, total chrome content is that 1.29mg/L has all reduced under the GB; Obtain containing chromic throw out, subsequent use;
Step 6, to get the mixed in hydrochloric acid that whole throw outs of obtaining in the step 5 and 100mL concentration is 1mol/L even, after send in the vibrator, with 80 rev/mins; Desorb 5 hours (chromic desorption efficiency is measured as 88%); After will contain chromic desorb mixed solution and send in the whizzer, with 1500 rev/mins rotating speed centrifugal 10 minutes, separate; Obtain the solution and useless reduction sorbent material of trivalent chromic ion, the solution of trivalent chromic ion (is mainly CrCl
36H
2O) can be used as and produce chromic salts or manufacturing contains purposes such as chrome pigment, and useless reduction sorbent material can be used as general refuse and carries out treatment and disposal.
Embodiment three
Step 1, get the Pericarpium Musae powder that a certain amount of particle diameter is 0.5cm, with sending into behind the deionized water wash 2 times in 105 ℃ the drying baker, oven dry is cooled to room temperature, and is subsequent use then;
Step 2, to get in the 20g step 1 Pericarpium Musae powder and 200mL concentration after the oven dry be 2% solid solution (sodium-alginate and chitosan), mixes, and forms mixed solution, after mixed solution is added the Cacl that 200mL concentration is 0.1mol/L
2In the solution, mix, form mixture, after mixture is processed the particle of 5mm, subsequent use;
Step 3, be that the compound particles of 5mm all adds the Cacl that 200mL concentration is 0.1mol/L with particle diameter in the step 2
2In the solution, left standstill 12 hours, take out the back, and with deionized water wash 2 times, filtration, drying makes the reduction sorbent material, and is subsequent use;
Step 4, getting reduction sorbent material and the 500mL concentration that 20g step 3 makes and mix for the 200mg/L chromate waste water, regulate pH value to 4, is 25 ℃ in temperature afterwards, and rotating speed is under 250 rev/mins the condition, to react 6 hours.Under the effect of reduction sorbent material, the sexavalent chrome in the waste water is reduced to trivalent chromium, and trivalent chromium is adsorbed by it then;
Step 5, the step 4 reacted wastewater is sent in the whizzer; With 1500 rev/mins rotating speed centrifugal 10 minutes; Supernatant is carried out the chromium content detection, record that chromic content is 0.25mg/L in the waste water, total chrome content is that 1.14 mg/L have all reduced under the GB; Obtain containing chromic throw out, subsequent use;
Step 6, to get the mixed in hydrochloric acid that whole throw outs of obtaining in the step 5 and 200mL concentration is 1mol/L even, after send in the vibrator, with 100 rev/mins; Desorb 6 hours (chromic desorption efficiency is measured as 92%); After will contain chromic desorb mixed solution and send in the whizzer, with 1500 rev/mins rotating speed centrifugal 10 minutes, separate; Obtain the solution and useless reduction sorbent material of trivalent chromic ion, the solution of trivalent chromic ion (is mainly CrCl
36H
2O) can be used as and produce chromic salts or manufacturing contains purposes such as chrome pigment, and useless reduction sorbent material can be used as general refuse and carries out treatment and disposal.
Claims (2)
1. utilize the method for Pericarpium Musae processing waste water containing chrome, it is characterized in that:
Step 1, get the Pericarpium Musae powder that particle diameter is 0.1-0.5cm, with sending into behind the deionized water wash 2 times in 105 ℃ the drying baker, oven dry is cooled to room temperature, and is subsequent use;
Step 2, to get in the 5-20g step 1 Pericarpium Musae powder and 50-200mL concentration after the oven dry be that 2% solid solution mixes, and forms mixed solution, after mixed solution is added the Cacl that 50-200mL concentration is 0.1mol/L
2In the solution, mix, form mixture, after mixture is processed the particle of 2-5mm, subsequent use;
Step 3, be that the compound particles of 2-5mm all adds the Cacl that 50-200mL concentration is 0.1mol/L with particle diameter in the step 2
2In the solution, left standstill 12 hours, take out the back, and with deionized water wash 2 times, filtration, drying makes the reduction sorbent material, and is subsequent use;
Step 4, the reduction sorbent material and the chromate waste water that make in the step 3 are mixed, wherein the mass ratio of sexavalent chrome and reduction sorbent material is 1:200 in the waste water, regulates pH value to 4; The back is 25 ℃ in temperature; Mixing speed is under 200-250 rev/mins the condition, to react 4-6 hours, and is subsequent use;
Step 5, the step 4 reacted wastewater is sent in the whizzer, with under 1500 rev/mins the rotating speed centrifugal 10 minutes; Hexavalent chromium concentration in the supernatant after centrifugal 0.5 mg/L, < 1.5 mg/>L contain chromic throw out after centrifugal to total chromium ion concentration, and are subsequent use;
Step 6, to get the mixed in hydrochloric acid that whole throw outs of obtaining in the step 5 and 50-200mL concentration is 1mol/L even; After send in the vibrator, under 50-100 rev/mins rotating speed, desorb 4-6 hours; After will contain chromic desorb mixed solution and send in the whizzer; With 1500 rev/mins rotating speed centrifugal 10 minutes, separate, obtain the solution and useless reduction sorbent material of trivalent chromic ion.
2. the method for utilizing the Pericarpium Musae processing waste water containing chrome as claimed in claim 1 is characterized in that: the solid solution composition in the step 2 be in sodium-alginate, gelatin, the chitosan one or more.
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Cited By (11)
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| CN103272566A (en) * | 2013-05-06 | 2013-09-04 | 重庆三峡学院 | Method for preparing ammonia nitrogen adsorbent by using banana peel and application of ammonia nitrogen adsorbent |
| CN103769033A (en) * | 2014-01-27 | 2014-05-07 | 北京工业大学 | Preparation method and application of modified zeolite permeable reactive wall filling carrying zero-valent iron powder |
| CN104962761A (en) * | 2015-07-14 | 2015-10-07 | 广西大学 | Method for resource utilization of watermelon peel |
| CN104962760A (en) * | 2015-07-14 | 2015-10-07 | 广西大学 | Method for resource utilization of banana peel |
| CN105668681A (en) * | 2016-01-25 | 2016-06-15 | 长沙理工大学 | Method for adsorbing and removing arsenic and hexavalent chromium in water by using modified shaddock peel |
| CN105800764A (en) * | 2016-05-06 | 2016-07-27 | 同济大学 | Method for removing hexavalent chromium in water |
| CN106140105A (en) * | 2016-08-01 | 2016-11-23 | 广西南宁桂尔创环保科技有限公司 | A kind of preparation method of waste water mercury-removing adsorbent |
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| CN107376860A (en) * | 2017-08-25 | 2017-11-24 | 河海大学 | A kind of dye sorbent and preparation method thereof |
| CN107790487A (en) * | 2016-09-01 | 2018-03-13 | 株式会社Towa建设 | The reduction method and depressant of 6 valency chromium |
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| CN103272566B (en) * | 2013-05-06 | 2015-05-06 | 重庆三峡学院 | Method for preparing ammonia nitrogen adsorbent by using banana peel and application of ammonia nitrogen adsorbent |
| CN103272566A (en) * | 2013-05-06 | 2013-09-04 | 重庆三峡学院 | Method for preparing ammonia nitrogen adsorbent by using banana peel and application of ammonia nitrogen adsorbent |
| CN103769033A (en) * | 2014-01-27 | 2014-05-07 | 北京工业大学 | Preparation method and application of modified zeolite permeable reactive wall filling carrying zero-valent iron powder |
| CN104962761A (en) * | 2015-07-14 | 2015-10-07 | 广西大学 | Method for resource utilization of watermelon peel |
| CN104962760A (en) * | 2015-07-14 | 2015-10-07 | 广西大学 | Method for resource utilization of banana peel |
| CN105668681B (en) * | 2016-01-25 | 2018-03-23 | 长沙理工大学 | A kind of method of Cr VI and arsenic in modified pomelo peel Adsorption water |
| CN105668681A (en) * | 2016-01-25 | 2016-06-15 | 长沙理工大学 | Method for adsorbing and removing arsenic and hexavalent chromium in water by using modified shaddock peel |
| CN105800764A (en) * | 2016-05-06 | 2016-07-27 | 同济大学 | Method for removing hexavalent chromium in water |
| CN106140105A (en) * | 2016-08-01 | 2016-11-23 | 广西南宁桂尔创环保科技有限公司 | A kind of preparation method of waste water mercury-removing adsorbent |
| CN107790487A (en) * | 2016-09-01 | 2018-03-13 | 株式会社Towa建设 | The reduction method and depressant of 6 valency chromium |
| CN107175082A (en) * | 2017-05-25 | 2017-09-19 | 安徽宏远职业卫生技术服务有限公司 | A kind of water quality detection agent for being used to detect chromium in water |
| CN107376860A (en) * | 2017-08-25 | 2017-11-24 | 河海大学 | A kind of dye sorbent and preparation method thereof |
| CN112079462A (en) * | 2020-09-10 | 2020-12-15 | 青岛蓝色地球大数据科技有限公司 | Method for removing hexavalent chromium in wastewater |
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Application publication date: 20120704 |