CN105199854A - Method for recovering lipid from waste emulsion - Google Patents
Method for recovering lipid from waste emulsion Download PDFInfo
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- CN105199854A CN105199854A CN201410263346.0A CN201410263346A CN105199854A CN 105199854 A CN105199854 A CN 105199854A CN 201410263346 A CN201410263346 A CN 201410263346A CN 105199854 A CN105199854 A CN 105199854A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/74—Recovery of fats, fatty oils, fatty acids or other fatty substances, e.g. lanolin or waxes
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Abstract
The invention provides a method for recovering lipid from waste emulsion. According to the method, the waste emulsion is separated in a coarse-stage mode, a pH value is adjusted to be 8-9, an emulsion breaking agent W25 and coagulant poly aluminum chloride (PAC) are added for carrying out emulsion breaking for the first time, the floating separation lipid substance recovery rate reaches 84%, and the COD removal rate is 91.90%; a NaOH solution is used for adjusting the pH value back again, the coagulant poly aluminum chloride (PAC) and coagulant aid PHP are used for carrying out emulsion breaking for the second time, the floating separation lipid substance recovery rate is 99.98%, and the COD removal rate is 99.94%. By means of detection, COD, NH3-N, the pH value and chromaticity of water can meet the national second-class water drainage standard. The method solves the problems that in metal machining industry, after the oil-based and water-based emulsion in machine accessory cleaning fluid is used many times, the emulsion can not meet the cleaning requirement and is directly discharged, resources are wasted, and environment is polluted, and has the advantages of being high in lipid substance recovery rate and simple in operation technology, and reducing environmental pollution.
Description
Technical field
The present invention is a kind of method reclaiming lipid from waste emulsified mixture, relates to the technical field of Industrial Waste Water Treatments, has been related specifically to the recovery of resource and has saved utilization.
Background technology
At present, domestic metal-processing industry, a large amount of oil type used, aq. type emulsion in machine accessory cleaning industry, processing requirement is can not meet after producer repeatedly uses, need discard, because of in emulsion containing have an appointment about 5% humatite oil and other chemical industry batching, directly discharge to environment, in industrial dangerous waste is listed discarded emulsion by country, has determined HW09 by National Hazard refuse register.Domestic at present do not have good method effectively to process, and most company adopts simple treatment process, and result does not reach process emission request, and lipid material contained in waste emulsion also cannot effectively be separated, and recycles remote especially.Emulsion is in emulsion in sewage, and oil droplet size is generally 0.1-25 μm.Waste emulsified mixture very easily diffuses into oil film, 4.5m
3can 2.8 × 10 be formed
-4the oil film that mm is thick, covering 2.0 × 10
4m
2water surface; Make water body anaerobism, produce stench, cause aquatic organism anoxia asphyxia and dead.
The method of waste emulsion process has Physical, but it exists the too high drawback of disposable input cost; Microbial method, belongs to bio-refractory by the COD of waste water is higher than BOD several times even tens times; Chemical method, key point is exactly breaking milk and removing oil, but the dregs of fat and shipwreck depart from.Enclose one deck hydration shell outside tiny oil droplet, and with a certain amount of negative charge, again containing tensio-active agent in water, make emulsification be steady state, be difficult between elaioleucite merge, stable for extended periods of time, be difficult to the method removing with machinery.Have gravity oil-removing, oil removal by air bubbling, ceramic membrane oil removing and oleophobic membrane except wet goods deoiling method and activated charcoal desorption method to oil treatment process at present, but absorption has saturation history, easily cause sorbing material to waste, cost is high also causes volume to waste to lipid material.
Summary of the invention
The invention solves the drawback of chemical method place waste emulsion, a kind of method reclaiming lipid from waste emulsified mixture is provided, adopt By Bubble-floating Method to collect lipid material, pressure filtration vacuum drying, the rate of recovery of lipid material is high, operating procedure simple, reduce environmental pollution.
Technical scheme of the present invention is: comprise the following steps:
(1) Demulsification and coagulant precipitation: under normal temperature and pressure, carry out settlement separate to waste emulsion in settling tank, regulate PH=8-9, after stirring 20-40min, add emulsion splitter (W25), coagulant polymeric aluminium chloride (PAC), carry out first time Demulsification and coagulant precipitation; Wherein emulsion splitter (W25): the volume ratio of waste emulsion is 83ml/L, coagulant polymeric aluminium chloride (PAC): the volume ratio of waste emulsion is 25ml/L; (1) step is obtained by reacting upper layer of lipid material and lower floor's solution;
(2) dissolved air flotation: under normal temperature and pressure, in settling tank, be loaded on settling tank bottom vacuum pump and produce microbubble, the upper layer of lipid species adsorbs (1) step be obtained by reacting enters in solution in microbubble and brings liquid top layer into, through separated and collected lipid material, (2) step is separated and obtains solution A;
(3) PH regulates: be separated to (2) step and obtain adding in solution A NaOH solution, NaOH solution: the volume ratio of solution A is 17ml/L, and obtain solution B after (3) step joint, the pH value of solution B is 8-9;
(4) De-emulsification flocculent precipitation: under normal temperature and pressure, in settling tank, obtain in solution B, adding coagulant polymeric aluminium chloride (PAC) after stirring 20-40min after (3) step joint, coagulant aids (PHP), Keep agitation reaction 20-40min, wherein, coagulant polymeric aluminium chloride (PAC): the volume ratio of solution B is 17ml/L, coagulant aids (PHP): the volume ratio of solution B is 3.4ml/L; (4) step is obtained by reacting upper layer of lipid material and lower floor's solution;
(5) dissolved air flotation: under normal temperature and pressure, in settling tank, the upper layer of lipid species adsorbs (2) step be obtained by reacting enters in solution at the microbubble being loaded on the generation of settling tank bottom vacuum pump and brings liquid top layer into, and through separated and collected lipid material, (5) step is separated and obtains solution C;
(6) evaporate, filter: by the lipid material of (2) step and the lipid material of (5) step, carry out vacuum and heat, evaporate contained humidity in lipid material, then through Filter Press, reclaim and obtain cleaner lipid material;
(7) water quality detection: detect (5) step and be separated COD, NH of obtaining in solution C
3-N, pH value, colourity all can reach national two class water emission standards.
In described (1) step, churning time is 30min.
After adding NaOH solution in described (3) step, churning time is 20-30min.
In described (3) step, churning time is 30min.
In described (4) step, churning time is 30min.Stir and produce less calories.
In described (4) step, churning time is 60min.
In described (1) step, (3) step, (4) step, stirring velocity is that 50-70 turns/min.
In described (3) step, the pH value of solution B is 8,8.5,9.
Heating under vacuum evaporation recovery can be carried out in same equipment, and this equipment needs to connect vacuum pump.
The method coagulant aids in (1) step, (4) step reclaiming lipid in waste emulsified mixture of the present invention is PMA, and the difference of emulsion splitter: (1) step is W25, and (4) step is PHP.
The present invention, mainly for solving a difficult problem for waste emulsion recycling, serves good effect to the qualified discharge of waste water simultaneously.The method reclaiming lipid in waste emulsified mixture of the present invention is having certain requirement to the control of solution PH, in second time breakdown of emulsion, regulate PH to 8-9 by NaOH solution.Although the present invention's emulsion splitter and flocculation agent are all organism, COD value not only can not be brought to raise, by contrast good facilitation effect is served to the reduction of COD.The method reclaiming lipid in waste emulsified mixture of the present invention is better to the treatment effect of water, COD, NH in water after testing
3-N, pH value, colourity all can reach national two class water emission standards.The recovering effect of the present invention's lipid in waste emulsion is good, and through 2 breakdowns of emulsion, the rate of recovery of lipid material reaches 99.98%.Operating procedure of the present invention is simple, and the consumption of its chemical industry material, energy consumption and other disposal costs are less, and draining water quality reaches national secondary discharge standard, can produce great economic benefit and social benefit.The present invention is low to material requirements, and the lipid rate of recovery is high, and resource regeneration has good development prospect.
Embodiment
(1) Demulsification and coagulant precipitation: get the waste emulsified mixture that 1L contains 50g lipid material and put in settling tank, wherein COD value reaches 128000, is separated the thick level of waste emulsion, the solid impurity contained by removal.Under normal temperature and pressure, carry out settlement separate to waste emulsion in settling tank, regulate PH=8-9, after stirring 30min, add emulsion splitter (W25), coagulant polymeric aluminium chloride (PAC), carry out first time Demulsification and coagulant precipitation; Wherein emulsion splitter (W25): the volume ratio of waste emulsion is 83ml/L, coagulant polymeric aluminium chloride (PAC): the volume ratio of waste emulsion is 25ml/L; There is obvious layering in solution, (1) step is obtained by reacting upper layer of lipid material and lower floor's solution;
(2) dissolved air flotation: under normal temperature and pressure, in settling tank, the upper layer of lipid species adsorbs (1) step be obtained by reacting enters in solution at the microbubble being loaded on the generation of settling tank bottom vacuum pump and brings liquid top layer into, and through separated and collected lipid material, (2) step is separated and obtains solution A;
(3) PH regulates: under normal temperature and pressure, be separated to (2) step stir 20-40min in equalizing tank after and obtain adding in solution A NaOH solution, NaOH solution: the volume ratio of solution A is 17ml/L, obtain solution B after (3) step joint, the pH value of solution B is 8-9;
(4) De-emulsification flocculent precipitation: under normal temperature and pressure, in settling tank, obtain in solution B, adding coagulant polymeric aluminium chloride (PAC) after stirring 20-40min after (3) step joint, coagulant aids (PHP), Keep agitation reaction 20-40min, wherein, coagulant polymeric aluminium chloride (PAC): the volume ratio of solution B is 17ml/L, coagulant aids (PHP): the volume ratio of solution B is 3.4ml/L; (4) step is obtained by reacting upper layer of lipid material and lower floor's solution;
(5) dissolved air flotation: under normal temperature and pressure, in settling tank, the upper layer of lipid species adsorbs (2) step be obtained by reacting enters in solution at the microbubble being loaded on the generation of settling tank bottom vacuum pump and brings liquid top layer into, and through separated and collected lipid material, (5) step is separated and obtains solution C;
(6) evaporate, filter: by the lipid material of (2) step and the lipid material of (5) step, carry out vacuum and heat, evaporate contained humidity in lipid material, then through Filter Press, reclaim and obtain cleaner lipid material; Treated, (2) step is weighed and obtains lipid material 42g, clearance 84%, detect COD residual quantity 10400, clearance 91.90%.Treated, (5) step is weighed lipid material 7.99g, clearance 99.98%; COD residual quantity 78, clearance 99.94%.
(7) water quality detection: detect (5) step and be separated COD, NH of obtaining in solution C
3-N, pH value, colourity all can reach national two class water emission standards.
Claims (8)
1. from waste emulsified mixture, reclaim a method for lipid, it is characterized in that: comprise the following steps:
(1) Demulsification and coagulant precipitation: under normal temperature and pressure, carry out settlement separate to waste emulsion in settling tank, regulate PH=8-9, after stirring 20-40min, add emulsion splitter (W25), coagulant polymeric aluminium chloride (PAC), carry out first time Demulsification and coagulant precipitation; Wherein emulsion splitter (W25): the volume ratio of waste emulsion is 83ml/L, coagulant polymeric aluminium chloride (PAC): the volume ratio of waste emulsion is 25ml/L; (1) step is obtained by reacting upper layer of lipid material and lower floor's solution;
(2) dissolved air flotation: under normal temperature and pressure, in settling tank, be loaded on settling tank bottom vacuum pump and produce microbubble, the upper layer of lipid species adsorbs (1) step be obtained by reacting enters in solution in microbubble and brings liquid top layer into, through separated and collected lipid material, (2) step is separated and obtains solution A;
(3) PH regulates: under normal temperature and pressure, is separated and obtains adding in solution A NaOH solution, NaOH solution: the volume ratio of solution A is 17ml/L to (2) step, and obtain solution B after (3) step joint, the pH value of solution B is 8-9;
(4) De-emulsification flocculent precipitation: under normal temperature and pressure, in settling tank, obtain in solution B, adding coagulant polymeric aluminium chloride (PAC) after stirring 20-40min after (3) step joint, coagulant aids (PHP), Keep agitation reaction 20-60min, wherein, coagulant polymeric aluminium chloride (PAC): the volume ratio of solution B is 17ml/L, coagulant aids (PHP): the volume ratio of solution B is 3.4ml/L; (4) step is obtained by reacting upper layer of lipid material and lower floor's solution;
(5) dissolved air flotation: under normal temperature and pressure, in settling tank, the upper layer of lipid species adsorbs (2) step be obtained by reacting enters in solution at the microbubble being loaded on the generation of settling tank bottom vacuum pump and brings liquid top layer into, and through separated and collected lipid material, (5) step is separated and obtains solution C;
(6) evaporate, filter: by the lipid material of (2) step and the lipid material of (5) step, carry out vacuum and heat, evaporate contained humidity in lipid material, then through Filter Press, reclaim and obtain cleaner lipid material;
(7) water quality detection: detect (5) step and be separated COD, NH of obtaining in solution C
3-N, pH value, colourity all can reach national two class water emission standards.
2. the method reclaiming lipid from waste emulsified mixture according to claim 1, is characterized in that: in described (1) step, churning time is 30min.
3. the method reclaiming lipid from waste emulsified mixture according to claim 1, is characterized in that: after adding NaOH solution in described (3) step, churning time is 20-30min.
4. the method reclaiming lipid from waste emulsified mixture according to claim 3, is characterized in that: in described (3) step, churning time is 30min.
5. the method reclaiming lipid from waste emulsified mixture according to claim 1, is characterized in that: in described (4) step, churning time is 30min.
6. the method reclaiming lipid from waste emulsified mixture according to claim 1, is characterized in that: in described (4) step, churning time is 60min.
7. the method reclaiming lipid from waste emulsified mixture according to claim 1, is characterized in that: in described (1) step, (3) step, (4) step, stirring velocity is that 50-70 turns/min.
8. the method reclaiming lipid from waste emulsified mixture according to claim 1, is characterized in that: in described (3) step, the pH value of solution B is 8,8.5,9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263346.0A CN105199854A (en) | 2014-06-15 | 2014-06-15 | Method for recovering lipid from waste emulsion |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410263346.0A CN105199854A (en) | 2014-06-15 | 2014-06-15 | Method for recovering lipid from waste emulsion |
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| CN105199854A true CN105199854A (en) | 2015-12-30 |
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| CN201410263346.0A Pending CN105199854A (en) | 2014-06-15 | 2014-06-15 | Method for recovering lipid from waste emulsion |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106380037A (en) * | 2016-12-06 | 2017-02-08 | 张兖驹 | Recycling and purifying method for oil well operation formate weighting agent |
| CN107555692A (en) * | 2017-10-25 | 2018-01-09 | 江苏天航水处理有限公司 | A kind of water oil separating method of emulsion waste liquid |
| CN108503076A (en) * | 2018-03-28 | 2018-09-07 | 安徽欣创节能环保科技股份有限公司 | A kind of two level pretreating process for emulsified oily watewater |
| CN108911260A (en) * | 2018-08-09 | 2018-11-30 | 山西太钢不锈钢股份有限公司 | A kind of waste emulsified mixture treatment process |
-
2014
- 2014-06-15 CN CN201410263346.0A patent/CN105199854A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106380037A (en) * | 2016-12-06 | 2017-02-08 | 张兖驹 | Recycling and purifying method for oil well operation formate weighting agent |
| CN107555692A (en) * | 2017-10-25 | 2018-01-09 | 江苏天航水处理有限公司 | A kind of water oil separating method of emulsion waste liquid |
| CN108503076A (en) * | 2018-03-28 | 2018-09-07 | 安徽欣创节能环保科技股份有限公司 | A kind of two level pretreating process for emulsified oily watewater |
| CN108911260A (en) * | 2018-08-09 | 2018-11-30 | 山西太钢不锈钢股份有限公司 | A kind of waste emulsified mixture treatment process |
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Application publication date: 20151230 |