CN104944631A - Pretreatment method of high-concentration cutting fluid sewage - Google Patents
Pretreatment method of high-concentration cutting fluid sewage Download PDFInfo
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- CN104944631A CN104944631A CN201510297084.4A CN201510297084A CN104944631A CN 104944631 A CN104944631 A CN 104944631A CN 201510297084 A CN201510297084 A CN 201510297084A CN 104944631 A CN104944631 A CN 104944631A
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Abstract
The invention discloses a pretreatment method of high-concentration cutting fluid sewage. The pretreatment method comprises the following steps: high-concentration cutting fluid sewage is inputted into a demulsification tank, a chemical oxidation pond, a flocculation basin and an air flotation tank so as to respectively carry out demulsification, chemical oxidation, flocculation, air flotation and the like; scum and bottom sludge which are discharged out of each treating pond are all connected into a nearby sludge collection tank by a self-flowing mode; and clean water flows into a clean water area of the air flotation tank from the outer periphery of an internal cylinder of the air flotation tank, and the clean water is injected through a clean water pipe into a clean water basin to be stored for the next regular treatment. In the air flotation tank, spiral-flow water distribution and dissolved air flotation technologies are combined, equipment is simplified, and the conventional air flotation treatment effect is improved. After high-concentration cutting fluid sewage is treated by the method, effluent COD can be reduced below 800 mg/L, thus satisfying inflow conditions of secondary sewage treatment. Thus, the method provided by the invention has characteristics of simplified equipment, reasonable technology and good treatment effect, and is very suitable for chemical pretreatment of metal working high-concentration cutting fluid sewage.
Description
Technical field
The present invention relates to a kind of pretreatment process of sewage, be specifically related to a kind of pretreatment process of high density cutting fluid sewage.
Background technology
Waste water in metal machining process is mainly from cooling fluid, organic cleaning fluid, painting wastewater, electrical spark working fluid etc.Amount less but organic concentration is very high, wherein cooling fluid COD
crup to several ten thousand even hundreds of thousands of.There is bottleneck in the domestic process to high concentration mechanical processing waste water, many combined treatment process can successfully by its COD
crbeing down to thousands of, but wanting the subsequent disposal condition reaching conventional sewage, is but very difficult thing.In recent years along with the progress of metal machining production technology, the emulsion stability used is more and more higher, more and more difficult breakdown of emulsion; Meanwhile, this kind of waste component is complicated, biodegradability is poor and have certain toxicity.At present, process intermetallic composite coating high density cutting fluid sewage mainly adopts the treatment processs such as breakdown of emulsion, light electrolysis, charcoal absorption or ultrafiltration (or reverse osmosis) both at home and abroad.But these methods are all difficult to realize long period to be stablized, effectively processes, and there is following shortcoming: 1, conventional de-steady deoiling effect is not good; 2, light electrolysis fouling silting; 3, charcoal absorption cannot desorption and regeneration; 4, ultra filtering reverse osmosis membrane technique running cost and investment cost are very high.
Summary of the invention
The present invention object be to provide a kind of pretreatment process having breakdown of emulsion, chemical oxidation, flocculation, air supporting efficient high density cutting fluid sewage concurrently.
For achieving the above object, the pretreatment process of high density cutting fluid sewage of the present invention, comprises the following steps:
High density cutting fluid sewage is injected in breakdown of emulsion pond by water-in by a, adds dilute sulphuric acid and carries out acidifying, stops 5-15min, obtains the acid adjustment cutting fluid sewage that pH is 5; The ratio being 2 ‰ in medicament and sewage weight ratio again adds copperas solution in sewage, carries out breakdown of emulsion reaction; After 30 ~ 40min, add the NaOH solution that weight concentration is 10%, the pH regulating cutting fluid sewage is 7 ~ 8; After reaction 10min, breakdown of emulsion operation terminates, standing, layering, and the clear water in breakdown of emulsion pond passes through breakdown of emulsion water pump lifting to chemical reaction pond;
B adds dilute sulphuric acid to clear water after the breakdown of emulsion pumped in chemical oxidation pond, regulates pH=3, reaction 20min; The proportioning being 1.5 ‰ by medicament and sewage weight ratio again adds copperas solution, after hybrid reaction 10 ~ 20min; The H2O2 solution dividing 5 batches to add 30% again carries out chemical oxidation reaction, add that H2O2 solution total amount is clear water treatment capacity after breakdown of emulsion 5 ~ 8%, chemical oxidation reaction is after 1 hour, standing, sedimentation layering, chemical oxidation pond base sludge is discharged by deslagging line, in upper liquid, add NaOH solution, after regulating pH to 7 ~ 8 of sewage upper liquid, standing sedimentation again, the mud of sedimentation is discharged by deslagging line, and upper liquid then promotes water pump lifting to flocculation basin by oxidation;
C adds polymeric aluminum solution to upper liquid after the chemical reaction entering flocculation basin, and the weight ratio that adds of medicine, water is 4 ~ 6 ‰, coagulating 8 ~ 13min; Add cationic polyacrylamide solution again, adding weight ratio is 0.06 ~ 0.10 ‰, after coagulating 2 ~ 4min, leave standstill 30min, sedimentation layering, terminate flocculation reaction, the mud of sedimentation is discharged by deslagging line, and upper liquid promotes water pump lifting to air flotation pool by flocculation basin;
While the d upper liquid entered in air flotation pool enters in inner core by cyclone water distributor, start self-priming air dissolved pump and the clear water in clean water basin is carried out gas, water pressurization, after forming dissolved air water, inject in inner core by clear water pipe through dissolved air release, upper liquid and dissolved air water fully carry out waterpower and mix, carry out scum silica frost on the top of air flotation pool to be separated with clear water, scum silica frost enters body refuse collecting tank through slag receiving trough; Clear water is back to the clear water zone of air flotation pool through the outside surrounding of inner core, is stored by clear water pipe injected clear water pond; Mud in air flotation pool then enters body refuse collecting tank by blow-off pipe.
After adopting technique scheme, combined by breakdown of emulsion pond, chemical oxidation pond, flocculation basin, air flotation pool, clean water basin and body refuse collecting tank appropriate design, after intermetallic composite coating high density cutting fluid sewage is carried out the reaction treatment such as breakdown of emulsion, chemical oxidation, flocculation, air supporting respectively by breakdown of emulsion pond, chemical oxidation pond, flocculation basin, air flotation pool, the scum silica frost that each treating pond is discharged and base sludge all adopt and are pooled to body refuse collecting tank nearby from stream mode, discharge by the slag-drip opening of body refuse collecting tank is unified, be convenient to operational management, available protecting environment; Air flotation pool adopts eddy flow water distribution and air-dissolving air-float technology to combine, and both simplifies equipment, and improves again conventional air-flotation process effect; Intermetallic composite coating high density cutting fluid sewage is after process of the present invention, and water outlet COD can be down to below 800mg/L, meets the flow condition of sewage second-level process.Therefore, the present invention has equipment simplification, reasonable in technology, feature that treatment effect is good, is very suitable for the Chemical Pretreatment of intermetallic composite coating high density cutting fluid sewage.
Accompanying drawing explanation
Fig. 1 is the pretreatment process schema of high density cutting fluid sewage of the present invention;
Fig. 2 is the pretreatment process device structure schematic diagram of high density cutting fluid sewage of the present invention.
Embodiment
Be described further below in conjunction with the pretreatment process of accompanying drawing to high density cutting fluid sewage of the present invention;
From Fig. 1, Fig. 2, the pretreatment process of high density cutting fluid sewage of the present invention, comprises the following steps:
High density cutting fluid sewage is injected 1 li, breakdown of emulsion pond by water-in 11 by a, after reaching normal level, starts the first post-type mixer 7, sewage is made to be turbulent state, then carry out dosing by the first long handle dosing funnel 8: first add dilute sulphuric acid, regulate the pH=5 of cutting fluid sewage, reaction 20min; The ratio being 2 ‰ in medicament and sewage weight ratio again adds copperas solution in sewage, carries out breakdown of emulsion reaction; After 30 ~ 40min, add the NaOH solution that weight concentration is 10%, the pH regulating cutting fluid sewage is 7 ~ 8; After reaction 10min, terminate breakdown of emulsion reaction, and the first post-type mixer 7 of stopping transport, make breakdown of emulsion pond 1 be in static condition, sewage, by layering after gravity settling 30min, is opened breakdown of emulsion wash water valve 12, the mud bottom breakdown of emulsion pond 1 is drained into body refuse collecting tank 6 li; Close breakdown of emulsion wash water valve 12 again, open breakdown of emulsion outlet valve 13, start breakdown of emulsion and promote water pump 14, the clear water after breakdown of emulsion is promoted to chemical oxidation pond 2 li;
After clear water after b breakdown of emulsion pumps into chemical oxidation pond 2 to normal level, start the second post-type mixer 7 ', make it be turbulent state, then carry out dosing by the second long handle dosing funnel 8 ': first add dilute sulphuric acid, regulate pH=3, reaction 20min; The proportioning being 1.5 ‰ by medicament and sewage weight ratio again adds copperas solution, after reaction 10min, and the second post-type mixer 7 ' of stopping transport; Divide again 5 batches add 30% H
2o
2solution, according to the concentration of wastewater situation of chemical oxidation pond 2 li, controls to add H
2o
2solution total amount is 5 ~ 8% of sewage load, start oxidation simultaneously and promote water pump 23, open return valve 24, the sewage of chemical oxidation pond 2 li is made to be in pump around circuit state, by waterpower hybrid mode, realize the process effect of sewage chemical oxidation, reaction continues 1 hour, oxidation of stopping transport promotes water pump 23, terminates chemical oxidation reaction; Sewage standing sedimentation, opens oxidation wash water valve 21, drains the mud bottom chemical oxidation pond 2; Restart the second post-type mixer 7 ', add NaOH solution, regulate pH=7 ~ 8 scope in breakdown of emulsion pond, to stop transport the second post-type mixer 7 ', again make chemical oxidation pond 2 standing sedimentation, and open oxidation wash water valve 21, the mud bottom chemical oxidation pond 2 is drained into body refuse collecting tank 6 li; Close oxidation wash water valve 21, open oxidation outlet valve 22, start oxidation and promote water pump 23, the upper liquid after chemical oxidation is promoted to flocculation basin 3 li;
After upper liquid after c chemical oxidation pumps into flocculation basin 3 to normal level, start the 3rd post-type mixer 7 ", make it be turbulent state, by the 3rd long handle dosing funnel 8 " carry out dosing: first add polymeric aluminum solution, the weight ratio that adds of medicine, water is 4 ~ 6 ‰, coagulating 8 ~ 13min; Add cationic polyacrylamide solution again, adding weight ratio is 0.06 ~ 0.10 ‰, after coagulating 2 ~ 4min, to stop transport the 3rd post-type mixer 7 "; flocculation basin 3 static condition; layering after sewage gravity settling 30min, terminates flocculation reaction, opens coagulation wash water valve 31 and the mud bottom flocculation basin 3 is drained into body refuse collecting tank 6 li; Close coagulation wash water valve 31, open coagulation outlet valve 32, start flocculation and promote water pump 33, upper liquid is promoted to air flotation pool 4 li by inlet channel 420;
While the upper liquid of d in arrival air flotation pool 4 enters in inner core 42 by cyclone water distributor 421, start self-priming air dissolved pump 423, the backflow of the clear water of clean water basin 5 li is carried out gas, water pressurization, after forming dissolved air water, inject inner core 42 li by clear water pipe 44 through dissolved air release 422, upper liquid and dissolved air water fully carry out waterpower and mix, the scum silica frost flocs float of formation, carry out scum silica frost on the top of air flotation pool 4 to be separated with clear water: scum silica frost is bubbled through the water column in a large number, enter body refuse collecting tank 6 through slag receiving trough 41; Clear water under gravity, is back to the clear water zone of air flotation pool 4 through the outside surrounding of inner core 42, COD is that the clear water of below 800mg/L is stored by clear water pipe 44 injected clear water pond 5, is regularly discharged by rising pipe 51, enters next round treatment process; The mud that air flotation pool is 4 li then enters body refuse collecting tank 6 by blow-off pipe 43, is finally discharged by the body refuse relief outlet 61 of body refuse collecting tank 6.
In above-mentioned steps, all body refuses that each treating pond above-mentioned is discharged all are collected in body refuse collecting tank 6 li, discharge through body refuse relief outlet 61, can be used as solid waste and carry out the disposal of outer committee; Described ferrous sulfate adopts now with the current adding, because ferrous sulfate produces the high charged species of q.s in water, neutralization and reduction emulsion surface charge, make emulsion surely de-and reach demulsification.
In the present embodiment, the top of described breakdown of emulsion pond 1, chemical oxidation pond 2, flocculation basin 3, air flotation pool 4 is all set to square, and it is that the cone of 45 ° is bucket-shaped that bottom is set to inclination angle, is convenient to discharge the body refuse in each treating pond, improves pretreating effect.Use needs according to daily reality, the top of each treating pond also can be set to circle; The outlet that described oxidation promotes water pump 23 is divided into two-way through pipeline: wherein a road is connected with the first water inlet pipe 9, plays recirculate mixing effect; Another road is connected with the second water inlet pipe 9 ', facilitates the sewage after chemical oxidation to inject and enters flocculation basin 3 li, carry out coagulating treatment process.
The present invention is directed to that machining of metals liquid sewage quantity is few, the feature of organic contamination substrate concentration superelevation; have employed the combined method integrating the sewage disposal technologies such as breakdown of emulsion, chemical oxidation, flocculation, air supporting, deslagging; both continuous operation can be adopted, also interval operation scheme in batches can be adopted; efficiently can process the high density cutting fluid sewage of metal-working industry; such one side can reduce enterprise's production cost; another aspect at utmost protection of the environment, thus alleviate environmental pollution.
Claims (1)
1. a pretreatment process for high density cutting fluid sewage, comprises the following steps:
It is inner that high density cutting fluid sewage is injected breakdown of emulsion pond (1) by water-in (11) by a, adds dilute sulphuric acid and carry out acidifying, stop 5-15min, obtain the acid adjustment cutting fluid sewage that pH is 5; The ratio being 2 ‰ in medicament and sewage weight ratio again adds copperas solution in sewage, carries out breakdown of emulsion reaction; After 30 ~ 40min, add the NaOH solution that weight concentration is 10%, the pH regulating cutting fluid sewage is 7 ~ 8; After reaction 10min, breakdown of emulsion operation terminates, and leaves standstill, layering, and breakdown of emulsion pond (1) inner clear water is promoted to chemical reaction pond (2) by breakdown of emulsion water pump (14);
B adds dilute sulphuric acid to clear water after the inner breakdown of emulsion of chemical oxidation pond (2), regulates pH=3, reaction 20min; The proportioning being 1.5 ‰ by medicament and sewage weight ratio again adds copperas solution, after hybrid reaction 10 ~ 20min; The H2O2 solution dividing 5 batches to add 30% again carries out chemical oxidation reaction, add that H2O2 solution total amount is clear water treatment capacity after breakdown of emulsion 5 ~ 8%, chemical oxidation reaction is after 1 hour, standing, sedimentation layering, chemical oxidation pond (2) base sludge is discharged by deslagging line, in upper liquid, add NaOH solution, after regulating pH to 7 ~ 8 of sewage upper liquid, standing sedimentation again, the mud of sedimentation is discharged by deslagging line, and upper liquid then promotes water pump (23) by oxidation and is promoted to flocculation basin (3);
C adds polymeric aluminum solution to upper liquid after entering the inner chemical reaction of flocculation basin (3), and the weight ratio that adds of medicine, water is 4 ~ 6 ‰, coagulating 8 ~ 13min; Add cationic polyacrylamide solution again, adding weight ratio is 0.06 ~ 0.10 ‰, after coagulating 2 ~ 4min, leave standstill 30min, sedimentation layering, terminate flocculation reaction, the mud of sedimentation is discharged by deslagging line, and upper liquid promotes water pump (33) by flocculation basin and is promoted to air flotation pool (4);
D enter the inner upper liquid of air flotation pool (4) by cyclone water distributor (421) enter inner core (42) inner while, start self-priming air dissolved pump (423) and clear water inner for clean water basin (5) is carried out gas, water pressurization, after forming dissolved air water, inner core (42) is injected through dissolved air release (422) inner by clear water pipe (44), upper liquid and dissolved air water fully carry out waterpower and mix, carry out scum silica frost on the top of air flotation pool (4) to be separated with clear water, scum silica frost enters body refuse collecting tank (6) through slag receiving trough (41); Clear water is back to the clear water zone of air flotation pool (4) through inner core (42) outside surrounding, is stored by clear water pipe (44) injected clear water pond (5); The inner mud of air flotation pool (4) then enters body refuse collecting tank (6) by blow-off pipe (43).
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Cited By (9)
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| CN105541028A (en) * | 2016-01-11 | 2016-05-04 | 姜贵清 | Treatment process for plant cutting fluid wastewater |
| CN106565046A (en) * | 2016-08-31 | 2017-04-19 | 惠州市惠阳区力行环保有限公司 | Treatment method for waste cutting fluid |
| CN106830422A (en) * | 2017-02-14 | 2017-06-13 | 江苏科技大学 | A kind of short distance preprocess method of cutting waste fluid |
| CN106830517A (en) * | 2017-02-14 | 2017-06-13 | 江苏科技大学 | A kind of processing method of cutting waste fluid |
| CN107381866A (en) * | 2017-08-08 | 2017-11-24 | 无锡远林凯环保设备有限公司 | Integrated high efficiency mud-water separation purifier |
| CN107572630A (en) * | 2017-08-31 | 2018-01-12 | 新奥环保技术有限公司 | A kind of breaking device and method |
| CN107720868A (en) * | 2017-11-24 | 2018-02-23 | 广州益方田园环保股份有限公司 | One kind spraying waste water air-floating processing apparatus |
| CN108083566A (en) * | 2017-12-18 | 2018-05-29 | 深圳市美宜佳机电设备有限公司 | A kind of High-concentration organic wastewater treatment method |
| 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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Cited By (11)
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| CN105541028A (en) * | 2016-01-11 | 2016-05-04 | 姜贵清 | Treatment process for plant cutting fluid wastewater |
| CN106565046A (en) * | 2016-08-31 | 2017-04-19 | 惠州市惠阳区力行环保有限公司 | Treatment method for waste cutting fluid |
| CN106565046B (en) * | 2016-08-31 | 2020-04-03 | 惠州市惠阳区力行环保有限公司 | Method for treating waste cutting fluid |
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| CN107572630A (en) * | 2017-08-31 | 2018-01-12 | 新奥环保技术有限公司 | A kind of breaking device and method |
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| CN107720868A (en) * | 2017-11-24 | 2018-02-23 | 广州益方田园环保股份有限公司 | One kind spraying waste water air-floating processing apparatus |
| CN108083566A (en) * | 2017-12-18 | 2018-05-29 | 深圳市美宜佳机电设备有限公司 | A kind of High-concentration organic wastewater treatment method |
| 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: 20150930 |