CN105016522A - Film treatment process for fatty acid wastewater - Google Patents
Film treatment process for fatty acid wastewater Download PDFInfo
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- CN105016522A CN105016522A CN201510385724.7A CN201510385724A CN105016522A CN 105016522 A CN105016522 A CN 105016522A CN 201510385724 A CN201510385724 A CN 201510385724A CN 105016522 A CN105016522 A CN 105016522A
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Abstract
The invention discloses a film treatment process for fatty acid wastewater. The invention aims to provide a novel recycling film treatment process for fatty acid wastewater. The process comprises the processes: oil-separating pre-treatment, film technical ultrafiltration, filter pressing, air-floating technology, evaporative treatment or biological treatment and the like. The wastewater treatment process disclosed by the invention adopts a process of a double film method combined with various treatment modes and adopts a process flow of gradually removal and extraction by many steps, so that harmless treatment of the wastewater or recycle of resources is finally realized. The wastewater treatment process disclosed by the invention solves a series of problems that the prior art is complex in process, the wastewater treatment effect is poor, great in difficulty and high in cost, the beneficial components in the wastewater cannot be recycled, the equipment is large in occupied area, the flocculant is liable to low temperature failure and the like.
Description
Technical field
The invention belongs to technical field of waste water processing, be specifically related to a kind of fatty acid wastewater treatment process, particularly relate to a kind of fatty acid wastewater membrane treatment process.
Background technology
Fatty acid wastewater extensively exists, owing to containing a large amount of lipid acid, glycerine, promoting agent, grease etc. in this type of waste water, have good emulsifying and affinity, the value of COD, BOD5 of water body just can be caused to raise rapidly on a small quantity, the existence due to oil content exacerbates the difficulty of process.Acidification oil refer to the byproduct soap stock that oil refining plant is produced carry out acidification the oil obtained.Acidification oil is lipid acid in essence, wherein containing the Multiple components such as pigment and unacidified triglyceride level (neutral oil).
Producing in the process of lipid acid with acidification oil, wastewater source mainly produces in hydrolysis reaction phase process, and at the waste water of the degassed middle generation of thick oil, a small amount of lipid acid, glycerol content is contained at about 5-10% in waste water, for the main component in waste water, adopt sulfuric acid as acidization, therefore the salinities such as a large amount of sulfate radicals are contained in waste water, these salinities bring difficulty to follow-up biochemical treatment, except being rich in glycerine, also containing impurity such as organic acid, mineral acid, inorganic salt, phlegmatic temperaments (colloid).
After the organic waste water of fatty acids enters municipal sewage plant, the middle Long carbon chain lipid acid in waste water, oily substance are wrapped in the mass transfer that filler skin hinders oxygen, will cause aerobic microbiological metabolism disorder.If this kind of material is unprocessed directly enter rivers,lakes and seas water body, then endanger water ecosystem, severe contamination surrounding environment, the COD concentration of fatty acid wastewater reaches about 100000mg/l, content is very high, unprocessed direct discharge or the process eutrophication that all can cause water body not up to standard, bring serious pollution to accepting water body.In addition, in sewage work, the mixed grease of the medium-chain fatty acid of oily and the Long carbon chain lipid acid of solid fraction can block grid, and in sludge pump, long-pending slagging dirt, affects the normal operation of equipment.And in aerobic treatment unit and final tank, the mixture of fatty acids can be formed " fat ball " and is in suspended state together with the mud adhered to, and discharges with water outlet.Cause sludge loss on the one hand, also affect effluent quality simultaneously.
Starting material owing to using in lipid acid (production) wastewater treatment are different, cause principal pollutant composition in waste water to be also not quite similar, and these differences determine diversity on the treatment technology of these waste water and technologic singularity.The process such as applied chemistry method, Coagulation Method, biochemical process, membrane biological process fatty acid wastewater is all difficult to obtain desirable effect.
Show the conventional processing technique of domestic use mainly: adjustment, reaction, precipitation, coagulating sedimentation, sloping plate deposition, sludge condensation, press filtration filtration etc.
Mainly there is following problem in these conventional processing technique: the water after process does not reach that the index, the biochemical treatment that enter biochemical treatment can not run normally, a large amount of useful component of containing in waste water can not reasonably be recycled, do not realize resource utilization to recycle, processing cost is high, complex process, complex operation and treatment time long, occupation area of equipment is large, chemical cost amount is large, serviceability is not good, and cannot thoroughly remove oil content, biological floe and colloidalmaterial and oil in water emulsion due to current filter type, effluent quality is poor.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of technique simple, easy and simple to handle, treatment effect is good, cost is low, and occupation area of equipment is little, and the beneficiating ingredient in waste water can the fatty acid wastewater membrane treatment process recycled of resource utilization.
For achieving the above object, the technical solution adopted in the present invention is: a kind of fatty acid wastewater membrane treatment process, and it comprises oil removal pre-treatment, membrane technique ultrafiltration, press filtration, air flotation technology, evaporation process or biochemical treatment, and its concrete technology is:
Step one, fatty acid wastewater is squeezed into retaining equalizing tank, regulating water quality, water temperature and the water yield;
Step 2, will introduce in device for ultrafiltration membrane 1 through the adjusted fatty acid wastewater of retaining equalizing tank and carry out filtration treatment;
Step 3, waste water after ultrafiltration membrance filter are divided into filtrate and condensed water two portions, and condensed water wherein enters lipid acid accumulator tank after carrying out circular treatment;
Step 4, by described in above-mentioned steps filtrate introduce reaction tank 1, in reaction tank 1, add alkaline anti-reagent, adjust ph is also placed static, carries out one-level depickling process;
Pumped in filtering equipment after waste water reaction in step 5, reaction tank 1 completes, by filtering equipment, filtrate is separated with solid impurity;
Step 6, by after press filtration filtrate introduce flocculation sedimentation tank, add a certain proportion of flocculation agent, adjust ph, carry out flocculation precipitation reaction;
Step 7, precipitation after waste water enter into airfloat equipment remove flocculation reaction after residue;
Step 8, through airfloat equipment process waste water introduce reaction tank 2, in reaction tank 2, also add alkali reaction agent, adjust ph is also placed static, carries out secondary depickling process;
Step 9, to be introduced in device for ultrafiltration membrane 2 by the waste water after secondary depickling processing reaction and carry out filtration treatment, the concentrated solution after ultrafiltration turns back in airfloat equipment again and carries out circular treatment;
Filtrate after step 10, above-mentioned steps ultrafiltration directly can carry out biochemical treatment, rear direct discharge up to standard; Or filtrate squeezed in vaporizer carry out evaporation process, collect the water after evaporation and glycerine.
Take the mode of naturally cooling to reduce the temperature of waste water in described step one, then to aeration in equalizing tank, waste water is fully mixed with regulating water quality.
What in described step 2, ultrafiltration membrance filter adopted is the operation scheme of efficient cross flow filter.
Ultra-filtration membrane precision≤0.1 micron that described ultrafiltration membrance filter uses.
Alkali reaction agent in described step 4 and step 8 is lime.
Described step 4 adjust ph, to 12, is reacted 2 hours.
Described step 8 adjust ph, to 11, is reacted 1 hour.
The present invention, relative to prior art, has following beneficial effect:
1, lipid acid can be reclaimed by the process of one-level film;
2, fatty acid wastewater directly can enter into device for ultrafiltration membrane, adopts crossflow filtration technique, without the need to carrying out pre-treatment, only need carry out the oil removal process of water quality and quantity;
3, adopt the objectionable constituent removed step by step in waste water in this technique, adopt one-level depickling, secondary depickling, the technique of coming unstuck, the biochemical treatment difficulty that the existence avoiding oil content in subsequent disposal produces, this is not available for other prior aries;
4, after this technical process process, the safe operation of biochemical treatment can be realized, or the resource utilization that can realize waste water is recycled, and realizes the zero release of waste water.
5, present invention process flow process is short, concise in technology, facility compact, and floor space is little, and operation and maintenance are easy, and treatment effect is good;
6, bi-membrane method process is adopted, can shortened process after process, reduce technology controlling and process node;
7, in this technique compared with prior art, system energy consumption is low, and working cost is low, and cost is low, and labor strength is low.
Accompanying drawing explanation
Fig. 1 is sewage treatment technology process figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further, but technical scope of the present invention is not limited thereto.
As shown in Figure 1, a kind of fatty acid wastewater membrane treatment process that the present embodiment describes, it comprises the steps: step one, fatty acid wastewater is squeezed into retaining equalizing tank, control suitable amount to place for some time and make water temperature drop to room temperature, reclaim the oil content of floating accumulation on liquid level, then adopt aeration to be that waste water fully mixes.
Step 2, will introduce in device for ultrafiltration membrane 1 carry out one-level uf processing through the adjusted fatty acid wastewater of retaining equalizing tank, this process mainly reclaims lipid acid, and removes dissolving in waste water, emulsification and the oil content of dispersion, oarse-grained impurity etc.
Step 3, waste water after ultrafiltration membrance filter are divided into filtrate and condensed water two portions, and condensed water wherein carries out circular treatment, when condensed water is concentrated to a certain degree, enters in lipid acid accumulator tank, after its lipid acid is separated out, reclaim lipid acid.
Step 4, the filtrate described in above-mentioned steps is introduced reaction tank 1, in reaction tank 1, add alkaline anti-reagent lime, adjust ph is also placed arrest reaction for some time and is carried out one-level depickling process.
Pumped in filtering equipment after waste water reaction in step 5, reaction tank 1 completes, by filtering equipment the solid impurity in waste water carried out dewatering and filtrate is separated with solid impurity by waste residue drying and other treatment.
Step 6, filtrate after press filtration is introduced flocculation sedimentation tank, now also contain very tiny colloidalmaterial in waste water filtrate, these colloidalmaterial particles are very tiny, and pole is not easily precipitated, and the existence of colloidalmaterial turns over look when can have a strong impact on dehydration by evaporation, cause equipment scaling etc., dehydration by evaporation even can be made to carry out, therefore degumming process must be carried out, degumming process adopts the mode of flocculation sediment to carry out, a certain proportion of flocculation agent is added in waste water, adjust ph is to 12, react 2 hours, the tiny granular precipitate material in waste water is made to agglomerate to together, form the macrobead of large easy precipitation.
Step 7, precipitation after waste water enter into airfloat equipment remove flocculation reaction after residue.
Step 8, the waste water introducing reaction tank 2 crossed through air-flotation process, in reaction tank 2, again add alkali reaction agent lime, adjust ph is 11, reacts 1 hour, carries out secondary depickling process.
Step 9, the waste water after secondary depickling processing reaction introduced in device for ultrafiltration membrane 2 and carries out uf processing, concentrated solution after ultrafiltration turns back in airfloat equipment again and carries out circular treatment, impurity in concentrated solution is further removed by airfloat equipment, reduce the concentration of useless impurities in water, reduce the pollution of film.
Filtrate after step 10, above-mentioned steps ultrafiltration directly can carry out biochemical treatment, rear direct discharge up to standard; Or filtrate squeezed in vaporizer carry out evaporation process, collect the water after evaporation and glycerine.
Ultra-filtration membrane precision≤0.1 micron that above-mentioned steps four and the ultrafiltration membrance filter described in step 8 use, what adopt is the operation scheme of efficient cross flow filter, this mode farthest can take away the pollutent on film surface, and clean film surface, makes the film device cycle of operation longer.
The key point of waste water treatment process of the present invention is the technique adopting the multiple processing mode of bi-membrane method to combine, and adopts multi-step progressively to remove the technical process of extraction, finally realizes the harmless treatment of waste water or the recycling of resource.Wherein, ultra-filtration membrane plays very important effect in the art, first one-level ultra-filtration membrane reclaims lipid acid, the impurity such as the oil content in waste water, macromolecular substance, suspended substance are effectively removed, the biochemical treatment difficulty that the existence avoiding oil content in subsequent disposal produces, and eliminates a large amount of lipid acid, suspended substance etc., and the lime making to add in follow-up process, flocculation agent addition all significantly reduce, working cost is also significantly reduced, decreases the amount of waste residue simultaneously; The tiny deposit seeds material such as calcium sulfate, calcium phosphate formed in waste water is mainly removed by two-stage ultrafiltering, the colloid produced in scouring processes is also removed in the lump simultaneously, this is that other filtration institutes are inaccessiable, ensures subsequent biochemical process or carries out carrying out smoothly of evaporation process.The treatment process that multiple processing mode combines, ensure that the effect of process, and these conventional water treating equipment such as filtering equipment, airfloat equipment, evaporation equipment combine, and reduce the complexity of technical process to greatest extent.
In sum, fatty acid wastewater treatment process provided by the invention has the following advantages:
1, lipid acid can be reclaimed by the process of one-level film;
2, fatty acid wastewater directly can enter into device for ultrafiltration membrane, adopts crossflow membrane filtration technology, without the need to carrying out pre-treatment, only need carry out the oil removal process of water quality and quantity;
3, adopt the objectionable constituent removed step by step in waste water in this technique, adopt one-level depickling, secondary depickling, the technique of coming unstuck, the biochemical treatment difficulty that the existence avoiding oil content in subsequent disposal produces, this is not available for other prior aries;
4, after this technical process process, the safe operation of biochemical treatment can be realized, or the resource utilization that can realize waste water is recycled, and realizes the zero release of waste water.
5, present invention process flow process is short, concise in technology, facility compact, and floor space is little, and operation and maintenance are easy, and treatment effect is good;
6, bi-membrane method process is adopted, can shortened process after process, reduce technology controlling and process node;
7, in this technique compared with prior art, system energy consumption is low, and working cost is low, and cost is low, and labor strength is low.
Claims (7)
1. a fatty acid wastewater membrane treatment process, is characterized in that: it comprises oil removal pre-treatment, membrane technique ultrafiltration, press filtration, air flotation technology, evaporation process or biochemical treatment, and its concrete technology is:
Step one, fatty acid wastewater is squeezed into retaining equalizing tank, regulating water quality, water temperature and the water yield;
Step 2, will introduce in device for ultrafiltration membrane 1 through the adjusted fatty acid wastewater of retaining equalizing tank and carry out filtration treatment;
Step 3, waste water after ultrafiltration membrance filter are divided into filtrate and condensed water two portions, and condensed water wherein enters lipid acid accumulator tank after carrying out circular treatment;
Step 4, by described in above-mentioned steps filtrate introduce reaction tank 1, in reaction tank 1, add alkaline anti-reagent, adjust ph is also placed static, carries out one-level depickling process;
Pumped in filtering equipment after waste water reaction in step 5, reaction tank 1 completes, by filtering equipment, filtrate is separated with solid impurity;
Step 6, by after press filtration filtrate introduce flocculation sedimentation tank, add a certain proportion of flocculation agent, adjust ph, carry out flocculation precipitation reaction;
Step 7, precipitation after waste water enter into airfloat equipment remove flocculation reaction after residue;
Step 8, the waste water introducing reaction tank 2 crossed through air-flotation process, in reaction tank 2, again add alkali reaction agent, adjust ph is also placed static, carries out secondary depickling process;
Step 9, to be introduced in device for ultrafiltration membrane 2 by the waste water after secondary depickling processing reaction and carry out filtration treatment, the concentrated solution after ultrafiltration turns back in airfloat equipment again and carries out circular treatment;
Filtrate after step 10, above-mentioned steps ultrafiltration directly can carry out biochemical treatment, rear direct discharge up to standard; Or filtrate squeezed in vaporizer carry out evaporation process, collect the water after evaporation and glycerine.
2. a kind of fatty acid wastewater membrane treatment process as claimed in claim 1, is characterized in that: take the mode of naturally cooling to reduce the temperature of waste water in described step one, then to aeration in equalizing tank, waste water is fully mixed with regulating water quality.
3. a kind of fatty acid wastewater membrane treatment process as claimed in claim 1, is characterized in that: what in described step 2, ultrafiltration membrance filter adopted is the operation scheme of efficient cross flow filter.
4. a kind of fatty acid wastewater membrane treatment process as described in claim 1 or 3, is characterized in that: ultra-filtration membrane precision≤0.1 micron that described ultrafiltration membrance filter uses.
5. a kind of fatty acid wastewater membrane treatment process as claimed in claim 1, is characterized in that: the alkali reaction agent in described step 4 and step 8 is lime.
6. a kind of fatty acid wastewater membrane treatment process as claimed in claim 1, is characterized in that: described step 4 adjust ph, to 12, is reacted 2 hours.
7. a kind of fatty acid wastewater membrane treatment process as claimed in claim 1, is characterized in that: described step 8 adjust ph, to 11, is reacted 1 hour.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510385724.7A CN105016522B (en) | 2015-07-06 | 2015-07-06 | Film treatment process for fatty acid wastewater |
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| CN201510385724.7A CN105016522B (en) | 2015-07-06 | 2015-07-06 | Film treatment process for fatty acid wastewater |
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| CN105016522A true CN105016522A (en) | 2015-11-04 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108203209A (en) * | 2018-02-10 | 2018-06-26 | 铁岭金铎科技股份有限公司 | The processing method of acid-bearing wastewater a kind of generated in acidification oil production process |
| CN109179745A (en) * | 2018-08-29 | 2019-01-11 | 杭州轩辉环境设备有限公司 | A kind for the treatment of process for the waste water producing fatty acid generation |
| CN113480078A (en) * | 2021-08-13 | 2021-10-08 | 上海灿星环境科技有限公司 | Soapstock acidification wastewater treatment process |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108203209A (en) * | 2018-02-10 | 2018-06-26 | 铁岭金铎科技股份有限公司 | The processing method of acid-bearing wastewater a kind of generated in acidification oil production process |
| CN109179745A (en) * | 2018-08-29 | 2019-01-11 | 杭州轩辉环境设备有限公司 | A kind for the treatment of process for the waste water producing fatty acid generation |
| CN113480078A (en) * | 2021-08-13 | 2021-10-08 | 上海灿星环境科技有限公司 | Soapstock acidification wastewater treatment process |
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| CN105016522B (en) | 2017-05-10 |
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