CN204224357U - Oil-containing stainless-steel cold-rolling wastewater treatment equipment - Google Patents
Oil-containing stainless-steel cold-rolling wastewater treatment equipment Download PDFInfo
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- CN204224357U CN204224357U CN201420634380.XU CN201420634380U CN204224357U CN 204224357 U CN204224357 U CN 204224357U CN 201420634380 U CN201420634380 U CN 201420634380U CN 204224357 U CN204224357 U CN 204224357U
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Abstract
A kind of oil-containing stainless-steel cold-rolling wastewater treatment equipment, comprise wastewater storage tank, grease removal tank, except chromium groove, the first neutralization tank, the second neutralization tank, flocculation basin, settling tank, concentration basin, storage basin, press filtration pond, backflow pool, the 3rd neutralization tank and filter vat.Grease removal tank is provided with at least one vapour pipe, and each vapour pipe all has an opening, and the opening surface of vapour pipe is arranged, for heating the oil reservoir on grease removal tank surface to the opening going out oil sump.Above-mentioned oil-containing stainless-steel cold-rolling wastewater treatment equipment is by being provided with except grease removal tank, except chromium pond, three grades of neutralization tanks, flocculation basin, settling tank, filter vat, concentration basin and press filtration ponds, oil, contents of many kinds of heavy metal ion, fluorion and sulfate ion can be removed simultaneously, the oil-containing stainless-steel cold-rolling waste water produced in the current producing stainless steel process of effective solution, recycle after bed mud directly can being carried out nature mummification simultaneously, thus decrease secondary environmental pollution.
Description
Technical field
The utility model relates to oil-containing stainless-steel cold-rolling field of waste water treatment, particularly relates to a kind of oil-containing stainless-steel cold-rolling wastewater treatment equipment.
Background technology
Along with the development of stainless steel industry, the waste water containing heavy metal produced in its process of manufacture and the impact of solid waste on surrounding soil and surface water environment also manifest day by day.In the complete processings such as stainless steel annealing, normalizing, quenching, normalizing, welding, forging, stainless steel surface can produce iron scale, its main component is FeO, Fe
2o
3, NiO
2, Cr
2o
3, Fe
3o
4, FeOCr
2o
3, NiFe
2o
3, FeOCr
2o
3fe
2o
3deng dense form oxide compound.The basic strong adhesion of these oxide compounds, at employing ball blast, in the treatment process of the combination procesies such as high temperature alkaline etching, fused salt electrolysis, nitration mixture pickling, multistage rinsing, inevitably discharge the multichannel pickling waste waterss such as neutral salt waste liquid, mixed acid waste liquor, fluoride waste, poaching wastewater.And these stainless-steel cold-rolling waste component and generation operation difference time are very large, there is complicated component, the acidity major part features such as harmful substance contents exceeds standard, environmental hazard is large.
At present, the domestic process to stainless-steel cold-rolling waste water mainly contains: (1) utilizes neutralizing device fully to neutralize; (2) burning facility is utilized fully to burn; (3) utilize the miscellaneous equipments such as ion-exchange unit to carry out regeneration to reclaim.But these method Problems existing mainly easily cause secondary pollution or high in cost of production.
Such as, chromium, nickel salt extracting method in Chinese patent 200710069398.4 1 kinds of stainless steel acid cleaning waste waters, disclose a kind for the treatment of process of acid waste water, refers in particular to the extracting method of chromium, nickel salt in a kind of stainless steel acid waste water.The present invention is by removing objectionable impurities in acid waste water stage by stage, added calcium salt before this, and control pH is 2.0 ~ 4.0, removes fluoride ion, add highly basic or soda ash again, control pH is 7.0 ~ 8.0, after filtration, can effectively realize qualified discharge liquid, again the filter residue acid solution after filtration is carried out acidifying oxidizing reaction, control pH is 1.0 ~ 4.0, filters the iron ion removed wherein, is precious metal chromium, the nickel salt of extraction in remaining filtrate.Advantage of the present invention is, can reduce the add-on of calcium salt, highly basic or soda ash, can realize the qualified discharge of liquid, and can not cause the situation of heavy metal secondary pollution, recycles chromium, nickel salt, effectively increases economic efficiency.The present invention can be widely used in wastewater treatment and the similar enterprises of various stainless steel manufacturing concern.
Chinese patent 201110262416.7 stainless steel acid waste water reduces Cr
6+treatment process, this invention be stainless steel acid waste water reduce Cr
6+treatment process, its step comprises: stainless steel nitration mixture waste water and sulfuric acid wastewater containing sent in reduction pond; In reduction pond, add reductive agent and stir, making Cr in waste water
6+be converted into Cr
3+, reach the water outlet inflow neutralization tank that ORP requires; To neutralization tank feeding lime, and drum oxygen aeration, by Fe in waste water
2+be oxidized to Fe
3+, form Cr (OH)
3, CaF
2, Fe (OH)
3, CaSO
4precipitation; The water outlet of neutralization tank enters flocculation basin; Add PAM to flocculation basin and form large alumen ustum, dosage is 2 ~ 5mg/L, and the water outlet of flocculation basin flows in settling tank; The water outlet of flocculation basin after settling tank precipitation, water outlet to subsequent disposal facility, this water outlet Cr
6+should emission request be met, then the mud in settling tank regularly be transported outward.The present invention can meet environmental requirement, and is beneficial to subsequent biochemical process.
But above-mentioned disclosed patent still cannot provide a kind for the treatment of unit that can process the comprehensive treating process of all kinds of waste water that stainless-steel cold-rolling process produces.
Utility model content
Based on this, be necessary to provide a kind of low cost, high-level efficiency, the oil-containing stainless-steel cold-rolling wastewater treatment equipment produced in producing stainless steel process can be processed.
A kind of oil-containing stainless-steel cold-rolling wastewater treatment equipment, comprise wastewater storage tank, grease removal tank, except chromium groove, the first neutralization tank, the second neutralization tank, flocculation basin, settling tank, concentration basin, storage basin, press filtration pond, backflow pool, the 3rd neutralization tank and filter vat;
Described wastewater storage tank is communicated with described grease removal tank, described grease removal tank is communicated with the described chromium groove that removes, described first neutralization tank is communicated with the described chromium groove that removes, described second neutralization tank is communicated with described first neutralization tank, described flocculation basin is communicated with described second neutralization tank, described settling tank is communicated with described flocculation basin and described concentration basin respectively, described storage basin is communicated with described concentration basin, described press filtration pond is communicated with described storage basin, described backflow pool is communicated with described press filtration pond and described settling tank respectively, described 3rd neutralization tank is communicated with described settling tank, described filter vat is communicated with described 3rd neutralization tank,
Described grease removal tank is provided with at least one vapour pipe, and vapour pipe described in each all has an opening, and the opening surface of described vapour pipe to described go out oil sump opening arrange, for heating the oil reservoir on described grease removal tank surface.
Wherein in an embodiment, in described wastewater storage tank, be also provided with grid.
Wherein in an embodiment, described grid is " H " character form structure.
Wherein in an embodiment, described grid is provided with two filter grids.
Wherein in an embodiment, two described filter grids are arranged in parallel.
Wherein in an embodiment, described filter grid is stainless steel filter grid.
Wherein in an embodiment, described removing in chromium groove is provided with whipping appts.
Wherein in an embodiment, in described concentration basin, be provided with central transmission concentrator.
Wherein in an embodiment, in described press filtration pond, be provided with plate-and-frame filter press.
Above-mentioned oil-containing stainless-steel cold-rolling waste water is by arranging grease removal tank, except chromium pond, three grades of neutralization tanks, flocculation basin, settling tank, filter vat, concentration basin and press filtration ponds, oil, contents of many kinds of heavy metal ion, fluorion and sulfate ion can be removed simultaneously, the oil-containing stainless-steel cold-rolling waste water produced in the current producing stainless steel process of effective solution, simultaneously due to the bed mud water content lower (being less than 35%) after process, recycle after bed mud directly can being carried out nature mummification, thus decrease secondary environmental pollution, improve resource recycling.
Accompanying drawing explanation
Fig. 1 is the schema of the oil-containing stainless-steel cold-rolling method of wastewater treatment of an embodiment;
Fig. 2 is the structural representation of the oil-containing stainless-steel cold-rolling wastewater treatment equipment of an embodiment.
Embodiment
For enabling above-mentioned purpose of the present utility model, feature and advantage become apparent more, are described in detail embodiment of the present utility model below in conjunction with accompanying drawing.Set forth a lot of detail in the following description so that fully understand the utility model.But the utility model can be much different from alternate manner described here to implement, those skilled in the art can when doing similar improvement without prejudice to when the utility model intension, and therefore the utility model is by the restriction of following public concrete enforcement.
As shown in Figure 1, the oil-containing stainless-steel cold-rolling method of wastewater treatment of an embodiment comprises the steps:
S110: after oil-containing stainless-steel cold-rolling waste water is removed the gred, leave standstill 2h ~ 3h, at 40 DEG C ~ 50 DEG C, remove the oil slick of described oil-containing stainless-steel cold-rolling wastewater surface, then remove the oil in water emulsion in described oil-containing stainless-steel cold-rolling waste water by dissolved air flotation process.
By carrying out oil-containing stainless-steel cold-rolling waste water, except Slag treatment, foreign material larger for volume in oil-containing stainless-steel cold-rolling waste water to be removed, avoiding pipeline and occurring to block the problems such as stuck, being conducive to oil-containing stainless-steel cold-rolling waste water and entering aftertreatment device swimmingly.
Oil-containing stainless-steel cold-rolling waste water after slagging-off is passed into grease removal tank, such as, by oil-containing stainless-steel cold-rolling waste water after leave standstill 2h ~ 3h after grease removal tank, make the oil slick in oil-containing stainless-steel cold-rolling waste water and the larger oil in water emulsion of particle rise to surface, collect surperficial oil reservoir and reach the object removing oil slick.And for example, also oil-containing stainless-steel cold-rolling waste water can be passed into air flotation pool, by dissolved air flotation process, like this, the oil in water emulsion in oil-containing stainless-steel cold-rolling waste water can be removed.
In order to be removed by the oil of oil-containing stainless-steel cold-rolling waste water to a greater degree, such as, can control temperature in grease removal tank is 40 DEG C ~ 50 DEG C, like this, can improve efficiency of deoiling, and promotes deoil rate.
S120: the first pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out reduction treatment, obtains the second pre-treatment oil-containing stainless-steel cold-rolling waste water.
Such as, in the first pre-treatment oil-containing stainless-steel cold-rolling waste water, add concentration is 0.05-5% sulfuric acid, after regulating pH to 2.5 ~ 3.0, adding concentration toward it is again 2%wt ~ 10%wt (massfraction) S-WAT or V-Brite B, the ORP value containing chromium oil-containing stainless-steel cold-rolling waste water is made to be 250mV ~ 300mV, after abundant stirring, the hexavalent chrome reduction in the first pre-treatment oil-containing stainless-steel cold-rolling waste water is made to become trivalent chromium.
S130: after the second pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out one-level aeration neutralizing treatment, obtain the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
Add alkaline matter toward the second pre-treatment oil-containing stainless-steel cold-rolling waste water, and give Air Exposure, by pH regulator to 3.5 ~ 4.0 of the second pre-treatment cold rolling wastewater, obtain the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
In traditional technology, some difficulties are usually produced owing to adopting Wingdale neutralizing treatment oil-containing stainless-steel cold-rolling waste water, such as, the calcium sulfate produced in neutralization reaction covers the carrying out that limestone surfaces can hinder neutralization reaction, therefore, with oil-containing stainless-steel cold-rolling waste water in generally adopting price slaked lime costly.
And in order to reduce reagent cost, such as, in the present embodiment, use aeration means, e.g., aeration intensity is: 0.5m
3~ 5m
3(air)/m
3(the second pre-treatment oil-containing stainless-steel cold-rolling waste water) h, adopt cheap Wingdale by the second pre-treatment oil-containing stainless-steel cold-rolling waste water neutralize to slightly acidic, due to aeration can guarantee limestone particle can not cover by the calcium sulfate precipitation that generates in reaction process, thus ensure that continuing of reacting carries out, and, the carbon dioxide that Air Exposure can also effectively produce in stripping reaction process, reduce input amount and the body refuse growing amount of alkali in secondary N-process, like this, the cost of medicament can be reduced further.
S140: the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water carried out in secondary and after Air Exposure, obtain the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
Alkaline matter is added in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, if concentration is the milk of lime of 5%, and continue aeration, along with the lasting dropping of milk of lime, the throw out of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water continues to increase and becomes reddish-brown, behind pH regulator to 8.5 ~ 9.5 of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, continues aeration 5 ~ 10 minutes, as, aeration intensity is: 1m
3~ 10m
3(air)/m
3(the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water) h, makes the Fe in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water
2+fe is oxidized under the effect of oxygen
3+, and form CaF
2, Fe (OH)
3, Ni (OH)
2, Cr (OH)
3and CaSO
4throw out, obtains the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
S150: after being carried out by the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water flocculating and precipitate, obtain the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water and the first pre-treatment bed mud.
4th pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out flocculation treatment, such as, in the 4th oil-containing stainless-steel cold-rolling waste water, add polymerize aluminum chloride (PAC) is flocculation agent, dosage is 1 ‰ ~ 5 ‰ (thousandths) of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume, after stirring 15min, adding polyacrylamide (PAM) is coagulant aids, and its dosage is 0.1 ‰ of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume.After flocculation, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out deposition and leave standstill, heavy metal ion is precipitated completely with the form of oxyhydroxide.Such as, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water after flocculation is passed into sedimentation tank, and heavy metal ion in the basic conditions, is deposited into the bottom of settling bath with the form of oxyhydroxide.In order to make heavy metal precipitate completely, and avoid carrying it into subsequent technique process, such as, time of repose is 1h ~ 2h, like this, heavy metal can be made to deposit completely, solid-liquid is separated completely.
S160: by the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water through three grades of neutralizations and after filtering, outer row.
In the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water, add acid, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, make to reach emission standard.
S170: after the first pre-treatment bed mud being carried out concentrated and press filtration, obtain the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water and the second pre-treatment bed mud.
The first pre-treatment bed mud that step S150 produces being concentrated to concentration basin by sludge pump positive delivery, in order to improve sludge condensation and dehydrating effect, such as, in the first pre-treatment bed mud, adding PAM with auxiliary mud-water separation.By the first pre-treatment bed mud extracting being carried out pressure rate to pressure filter with pump, the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water obtained flows out under gravity, and the water ratio of the second pre-treatment bed mud after press filtration is less than 35%.
S180: by the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation, three grades of neutralizations and filtration, outer row.
The 6th pre-treatment oil-containing stainless-steel cold-rolling return of waste water in step S170 after press filtration is carried out precipitation process to settling tank, be appreciated that, 6th pre-treatment oil-containing stainless-steel cold-rolling waste water is owing to have passed through in second and Air Exposure and in alkalescence, be back to settling tank, the input amount of precipitation process process neutral and alkali material can be reduced, reduce reagent cost.
In the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation process, add acid, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, guarantee to reach emission standard.
The treatment process of above-mentioned oil-containing stainless-steel cold-rolling waste water, by removing the gred to oil-containing stainless-steel cold-rolling waste water, oil removing, except steps such as chromium, neutralization, flocculation, precipitation and filtrations, oil, contents of many kinds of heavy metal ion, fluorion and sulfate ion can be removed simultaneously, the oil-containing stainless-steel cold-rolling waste water produced in the current producing stainless steel process of effective solution, simultaneously due to the bed mud water content lower (being less than 35%) after process, recycle after bed mud directly can being carried out nature mummification, thus decrease secondary environmental pollution, improve resource recycling.
In order to introduce oil-containing stainless-steel cold-rolling method of wastewater treatment of the present utility model further, such as, a kind of oil-containing stainless-steel cold-rolling wastewater treatment equipment is also provided.
As shown in Figure 2, it is the structural representation of the oil-containing stainless-steel cold-rolling wastewater treatment equipment 10 of an embodiment.
Refer to Fig. 2, oil-containing stainless-steel cold-rolling wastewater treatment equipment 10 comprise wastewater storage tank 100, grease removal tank 200, except chromium groove 300, first neutralization tank 400, second neutralization tank 500, flocculation basin 600, settling tank 700, concentration basin 800, storage basin 900, press filtration pond 900a, backflow pool 900b, the 3rd neutralization tank 900c and filter vat 900d.
Refer to Fig. 2, be provided with grid 110 in wastewater storage tank 100, grid 110 is for removing the larger foreign material of volume in sewage, so that waste water is smooth and easy enter rear portion treatment unit.
Such as, grid 110 is " H " character form structure, and grid 110 is provided with two filter grids, and two described filter grids can be used alone or are arranged in parallel, and filter grid is made up of stainless steel.
Refer to Fig. 2, wastewater storage tank 100 is communicated with grease removal tank 200, and the oil-containing stainless-steel cold-rolling waste water being stored in wastewater storage tank 100 passes into grease removal tank 200, in grease removal tank 200, the oil in oil-containing stainless-steel cold-rolling waste water can be made to remove.
Such as, by oil-containing stainless-steel cold-rolling waste water after leave standstill 2h ~ 3h after grease removal tank, make the oil slick in oil-containing stainless-steel cold-rolling waste water and the larger oil in water emulsion of particle rise to surface, collect surperficial oil reservoir and reach the object removing oil slick.And for example, also oil-containing stainless-steel cold-rolling waste water can be passed into air flotation pool, by dissolved air flotation process, like this, the oil in water emulsion in oil-containing stainless-steel cold-rolling waste water can be removed.
In order to a greater degree the oil of oil-containing stainless-steel cold-rolling waste water be removed, such as, grease removal tank 200 is provided with at least one vapour pipe 210, each vapour pipe 210 all has an opening, and described opening surface is arranged to going out oil sump 200, to make temperature in grease removal tank 200 control at 40 DEG C ~ 50 DEG C, like this, can efficiency of deoiling be improved, promote deoil rate.And for example, described grease removal tank is provided with at least one vapour pipe, and vapour pipe described in each all has an opening, and the opening surface of described vapour pipe to described go out oil sump opening arrange, for heating the oil reservoir on described grease removal tank surface.
Refer to Fig. 2, grease removal tank 200 is communicated with except chromium groove 300, the first pre-treatment oil-containing stainless-steel cold-rolling waste water after grease removal tank 200 processes passes into except in chromium groove 300, in the first pre-treatment oil-containing stainless-steel cold-rolling waste water, add concentration is 0.05-5% sulfuric acid, after regulating pH to 2.5 ~ 3.0, adding concentration toward it is again 2%wt ~ 10%wt S-WAT or V-Brite B, make the ORP value of the first pre-treatment oil-containing stainless-steel cold-rolling waste water for 250mV ~ 300mV, after abundant stirring, make to become trivalent chromium containing the hexavalent chrome reduction in chromium oil-containing stainless-steel cold-rolling waste water.
Because needs drop into a certain amount of medicine toward in chromium groove 300, as sulfuric acid, S-WAT and sodium hydroxide etc., except being provided with charging opening in chromium groove 300, adding of medicine can be facilitated like this.
In order to improve the speed of reaction except chromium groove 300, such as, being provided with whipping appts except in chromium groove 300, accelerating the speed of reaction of hexavalent chrome reduction, improve processing efficiency.
Refer to Fig. 2, the first neutralization tank 400 is communicated with except chromium groove 300.Pass into the first neutralization tank by through the second pre-treatment oil-containing stainless-steel cold-rolling waste water except chromium groove 300, in the first neutralization tank 300, add alkaline matter, and give Air Exposure, by pH regulator to 3.5 ~ 4.0 of the second pre-treatment cold rolling wastewater.
And in order to reduce reagent cost, such as, in the present embodiment, use aeration means, e.g., aeration intensity is: 0.5m
3~ 5m
3(air)/m
3(the second pre-treatment oil-containing stainless-steel cold-rolling waste water) h, adopt cheap Wingdale by the second pre-treatment oil-containing stainless-steel cold-rolling waste water neutralize to slightly acidic, due to aeration can guarantee limestone particle can not cover by the calcium sulfate precipitation that generates in reaction process, thus ensure that continuing of reacting carries out, and, the carbon dioxide that Air Exposure can also effectively produce in stripping reaction process, reduce input amount and the body refuse growing amount of alkali in secondary N-process, like this, the cost of medicament can be reduced further.
Refer to Fig. 2, the second neutralization tank 500 is communicated with the first neutralization tank 400.Alkaline matter is added in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, if concentration is the milk of lime of 5%, and continue aeration, along with the lasting dropping of milk of lime, the throw out of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water continues to increase and becomes reddish-brown, behind pH regulator to 8.5 ~ 9.5 of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, continues aeration 5 ~ 10 minutes, as, aeration intensity is: 1m
3~ 10m
3(air)/m
3(the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water) h, makes the Fe in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water
2+fe is oxidized under the effect of oxygen
3+, and form CaF
2, Fe (OH)
3, Ni (OH)
2, Cr (OH)
3and CaSO
4throw out.
Refer to Fig. 2, flocculation basin 600 is communicated with the second neutralization tank 500, the 4th pre-treatment cold rolling wastewater of the second neutralization tank 500 is passed into flocculation basin 600 and carries out flocculation treatment.
Such as, in the 4th oil-containing stainless-steel cold-rolling waste water, add polymerize aluminum chloride (PAC) is flocculation agent, dosage is 1 ‰ ~ 5 ‰ (thousandths) of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume, after stirring 15min, adding polyacrylamide (PAM) is coagulant aids, and its dosage is 0.1 ‰ of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume.After flocculation, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out deposition and leave standstill, heavy metal ion is precipitated completely with the form of oxyhydroxide.Such as, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water after flocculation is passed into sedimentation tank, and heavy metal ion in the basic conditions, is deposited into the bottom of settling bath with the form of oxyhydroxide.In order to make heavy metal precipitate completely, and avoid carrying it into subsequent technique process, such as, time of repose is 1h ~ 2h, like this, heavy metal can be made to deposit completely, solid-liquid is separated completely.
Because needs drop into a certain amount of medicine in flocculation basin 600, as PAC and PAM etc., in flocculation basin 600, be provided with charging opening, adding of medicine can be facilitated like this.
In order to improve the flocculation rate of flocculation basin 600, such as, in flocculation basin 600, be provided with whipping appts, oil-containing stainless-steel cold-rolling waste water is fully mixed with flocculation agent etc., improve flocculation efficiency.
Refer to Fig. 2, settling tank 700 is communicated with flocculation basin 600, flocculation basin 600 is carried out the importing of the treatment solution after flocculation treatment settling tank 700 and carries out precipitation process.
In order to prevent heavy metal precipitation to be mixed into subsequent processes, such as, settling tank 700 is tube settler, that is, the radius bottom settling tank 700 is less than the radius on its top, like this, heavy metal precipitation thing can be made to be not easy to enter subsequent processes.
Refer to Fig. 2, concentration basin 800 is communicated with settling tank 700, and the first pre-treatment bed mud produced in settling tank 700 is carried out concentration by sludge pump positive delivery to concentration basin 800.
Concentrating and dehydrating effect to improve the first pre-treatment bed mud, such as, in concentration basin 800, adding PAM with auxiliary mud-water separation, the concentrated of the first pre-treatment bed mud and dehydrating effect can be improved like this.And for example, in concentration basin 800, be provided with central transmission concentrator, improve the concentrated of the first pre-treatment bed mud and dehydrating effect.
In order to reduce costs, such as, the top of concentration basin 800 is communicated with the bottom of settling tank 700, can reduce the running cost of sludge pump.
Refer to Fig. 2, storage basin 900 is communicated with concentration basin 800, and press filtration pond 900a is communicated with storage basin 900, and backflow pool 900b is communicated with press filtration pond 900a.Storage basin 900 is entered by the first pre-treatment bed mud after concentration basin 800 processes, by the pump in storage basin, the first pre-treatment bed mud extracting is carried out pressure rate to press filtration pond 900a, the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water obtained flows into backflow pool 900b under gravity, and the water ratio of the second pre-treatment bed mud after the 900a process of press filtration pond is less than 35%.
Be provided with plate-and-frame filter press in the 900a of press filtration pond, be used for sloughing the water in the first pre-treatment bed mud further.For preventing the filter cloth in plate-and-frame filter press from blocking, such as, arranging backwash high pressure water pump and carrying out routine cleaning, back flushing draining flows into backflow pool 900b under gravity together with filtrate after press filtration.
Refer to Fig. 2, backflow pool 900b is communicated with settling tank 700, and the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water being stored in backflow pool 900b enters settling tank 700 by high-pressure pump and carries out further precipitation process.
Can to understand, the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water, owing to have passed through in second and Air Exposure and in alkalescence, be back to settling tank 700b, can reduce the input amount of precipitation process process neutral and alkali material, reduces reagent cost.
Refer to Fig. 2, the 3rd neutralization tank 900c is communicated with settling tank 700, and filter vat 900d is communicated with the 3rd settling tank 900c.
Owing to entering the waste water of the 3rd neutralization tank in alkalescence, can't emission standard be reached, by adding acid, as HCl, regulate pH to 6.5 ~ 7.2, making it reach emission standard.
After the 3rd neutralization tank 900c process, imported filtering basin further, by suspended substance removal, reduce its turbidity, make to reach emission standard.
Above-mentioned oil-containing stainless-steel cold-rolling wastewater treatment equipment 10 is by arranging grease removal tank, except chromium pond, three grades of neutralization tanks, flocculation basin, settling tank, filter vat, concentration basin and press filtration ponds, oil, contents of many kinds of heavy metal ion, fluorion and sulfate ion can be removed simultaneously, the oil-containing stainless-steel cold-rolling waste water produced in the current producing stainless steel process of effective solution, simultaneously due to the bed mud water content lower (being less than 35%) after process, recycle after bed mud directly can being carried out nature mummification, thus decrease secondary environmental pollution, improve resource recycling.
Be specific embodiment part below.
Embodiment 1:
The process of the oil-containing stainless-steel cold-rolling waste water of certain stainless steel factory, day quantity discharged be 1000 tons.Wherein, the water quality situation of the oil-containing stainless-steel cold-rolling waste water of this stainless steel factory is as table 1.
Table 1
Now as follows the oil-containing stainless-steel cold-rolling waste water of this electroplating facility is processed:
After the slagging-off of oil-containing stainless-steel cold-rolling waste water and oil removing, obtain the first pre-treatment oil-containing stainless-steel cold-rolling waste water.
By carrying out oil-containing stainless-steel cold-rolling waste water, except Slag treatment, foreign material larger for volume in oil-containing stainless-steel cold-rolling waste water being removed.
Oil-containing stainless-steel cold-rolling waste water after slagging-off is passed into grease removal tank, by oil-containing stainless-steel cold-rolling waste water after leave standstill 3h after grease removal tank, controlling temperature in grease removal tank is 50 DEG C, the oil slick in oil-containing stainless-steel cold-rolling waste water and the larger oil in water emulsion of particle is made to rise to surface, after collecting surperficial oil reservoir, oil-containing stainless-steel cold-rolling waste water is passed into air flotation pool, by dissolved air flotation process, the oil in water emulsion in removing oil-containing stainless-steel cold-rolling waste water.
First pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out reduction treatment, obtains the second pre-treatment oil-containing stainless-steel cold-rolling waste water.
In the first pre-treatment oil-containing stainless-steel cold-rolling waste water, add concentration is 0.05-5% sulfuric acid, after regulating pH to 3.0, adding concentration toward it is again 2%wt ~ 10%wt (massfraction) S-WAT, the ORP value containing chromium oil-containing stainless-steel cold-rolling waste water is made to be 280mV, 30min after abundant stirring, makes hexavalent chrome reduction become trivalent chromium.
After second pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out one-level aeration neutralizing treatment, obtain the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
Adding particle diameter toward the second pre-treatment oil-containing stainless-steel cold-rolling waste water is 0.5mm ~ 3mm limestone particle, and gives Air Exposure, and aeration intensity is: 2m
3(air)/m
3(the second pre-treatment oil-containing stainless-steel cold-rolling waste water) h, by pH regulator to 3.5 ~ 4.0 of the second pre-treatment cold rolling wastewater, obtains the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
3rd pre-treatment oil-containing stainless-steel cold-rolling waste water carried out in secondary and after Air Exposure, obtain the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
The milk of lime that concentration is 5% is added in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, and continue aeration, along with the lasting dropping of milk of lime, the throw out of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water continues to increase and becomes reddish-brown, behind pH regulator to 8.5 ~ 9.5 of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, continue aeration 10 minutes, e.g., aeration intensity is 5m
3(air)/m
3(the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water) h, makes the Fe in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water
2+fe is oxidized under the effect of oxygen
3+, and form CaF
2, Fe (OH)
3, Ni (OH)
2, Cr (OH)
3and CaSO
4throw out, obtains the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
After being carried out by 4th pre-treatment oil-containing stainless-steel cold-rolling waste water flocculating and precipitate, obtain the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water and the first pre-treatment bed mud.
In the 4th oil-containing stainless-steel cold-rolling waste water, add polymerize aluminum chloride (PAC) is flocculation agent, dosage is 1 ‰ ~ 5 ‰ (thousandths) of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume, after stirring 15min, adding polyacrylamide (PAM) is coagulant aids, and its dosage is 0.1 ‰ of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume.After flocculation, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out deposition and leave standstill, heavy metal ion is precipitated completely with the form of oxyhydroxide.Such as, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water after flocculation is passed into sedimentation tank, and heavy metal ion in the basic conditions, is deposited into the bottom of settling bath with the form of oxyhydroxide.Time of repose is 1h ~ 2h.
By the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water through three grades of neutralizations and after filtering, outer row.
In the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water, add acid, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, make to reach emission standard.
After first pre-treatment bed mud being carried out concentrated and press filtration, obtain the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water and the second pre-treatment bed mud.
The the first pre-treatment bed mud produced is concentrated to concentration basin by sludge pump positive delivery, in the first pre-treatment bed mud, adds PAM with auxiliary mud-water separation.By the first pre-treatment bed mud extracting being carried out pressure rate to pressure filter with pump, the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water obtained flows out under gravity, and the water ratio of the second pre-treatment bed mud after press filtration is less than 35%.
By the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation, three grades of neutralizations and filtration, outer row.
The 6th pre-treatment oil-containing stainless-steel cold-rolling return of waste water after press filtration carries out precipitation process to settling tank, acid is added in the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation process, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, guarantee to reach emission standard.
After above-mentioned treatment step, the discharge water obtained after testing after, water quality the results are shown in Table 2.
Table 2
Embodiment 2:
The process of the oil-containing stainless-steel cold-rolling waste water of certain stainless steel factory, day quantity discharged be 500 tons.Wherein, the water quality situation of the oil-containing stainless-steel cold-rolling waste water of this stainless steel factory is as table 3.
Table 3
Now as follows the oil-containing stainless-steel cold-rolling waste water of this electroplating facility is processed:
After the slagging-off of oil-containing stainless-steel cold-rolling waste water and oil removing, obtain the first pre-treatment oil-containing stainless-steel cold-rolling waste water.
By carrying out oil-containing stainless-steel cold-rolling waste water, except Slag treatment, foreign material larger for volume in oil-containing stainless-steel cold-rolling waste water being removed.
Oil-containing stainless-steel cold-rolling waste water after slagging-off is passed into grease removal tank, by oil-containing stainless-steel cold-rolling waste water after leave standstill 3h after grease removal tank, controlling temperature in grease removal tank is 40 DEG C, the oil slick in oil-containing stainless-steel cold-rolling waste water and the larger oil in water emulsion of particle is made to rise to surface, after collecting surperficial oil reservoir, oil-containing stainless-steel cold-rolling waste water is passed into air flotation pool, by dissolved air flotation process, the oil in water emulsion in removing oil-containing stainless-steel cold-rolling waste water.
First pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out reduction treatment, obtains the second pre-treatment oil-containing stainless-steel cold-rolling waste water.
In the first pre-treatment oil-containing stainless-steel cold-rolling waste water, add concentration is 0.05-5% sulfuric acid, after regulating pH to 3.0, adding concentration toward it is again 10%wt (massfraction) S-WAT, the ORP value containing chromium oil-containing stainless-steel cold-rolling waste water is made to be 280mV, 30min after abundant stirring, makes hexavalent chrome reduction become trivalent chromium.
After second pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out one-level aeration neutralizing treatment, obtain the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
Adding particle diameter toward the second pre-treatment oil-containing stainless-steel cold-rolling waste water is 0.5mm ~ 3mm limestone particle, and gives Air Exposure, and aeration intensity is: 2m
3(air)/m
3(the second pre-treatment oil-containing stainless-steel cold-rolling waste water) h, by the pH regulator to 4.0 of the second pre-treatment cold rolling wastewater, obtains the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
3rd pre-treatment oil-containing stainless-steel cold-rolling waste water carried out in secondary and after Air Exposure, obtain the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
The milk of lime that concentration is 5% is added in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, and continue aeration, along with the lasting dropping of milk of lime, the throw out of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water continues to increase and becomes reddish-brown, after the pH regulator to 9.5 of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, continue aeration 10 minutes, e.g., aeration intensity is 8m
3(air)/m
3(the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water) h, makes the Fe in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water
2+fe is oxidized under the effect of oxygen
3+, and form CaF
2, Fe (OH)
3, Ni (OH)
2, Cr (OH)
3and CaSO
4throw out, obtains the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
After being carried out by 4th pre-treatment oil-containing stainless-steel cold-rolling waste water flocculating and precipitate, obtain the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water and the first pre-treatment bed mud.
In the 4th oil-containing stainless-steel cold-rolling waste water, add polymerize aluminum chloride (PAC) is flocculation agent, dosage is 1 ‰ ~ 5 ‰ (thousandths) of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume, after stirring 15min, adding polyacrylamide (PAM) is coagulant aids, and its dosage is 0.1 ‰ of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume.After flocculation, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out deposition and leave standstill, heavy metal ion is precipitated completely with the form of oxyhydroxide.Such as, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water after flocculation is passed into sedimentation tank, and heavy metal ion in the basic conditions, is deposited into the bottom of settling bath with the form of oxyhydroxide.Time of repose is 1h ~ 2h.
By the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water through three grades of neutralizations and after filtering, outer row.
In the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water, add acid, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, make to reach emission standard.
After first pre-treatment bed mud being carried out concentrated and press filtration, obtain the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water and the second pre-treatment bed mud.
The the first pre-treatment bed mud produced is concentrated to concentration basin by sludge pump positive delivery, in the first pre-treatment bed mud, adds PAM with auxiliary mud-water separation.By the first pre-treatment bed mud extracting being carried out pressure rate to pressure filter with pump, the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water obtained flows out under gravity, and the water ratio of the second pre-treatment bed mud after press filtration is less than 35%.
By the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation, three grades of neutralizations and filtration, outer row.
The 6th pre-treatment oil-containing stainless-steel cold-rolling return of waste water after press filtration carries out precipitation process to settling tank, acid is added in the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation process, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, guarantee to reach emission standard.
After above-mentioned treatment step, the discharge water obtained after testing after, water quality the results are shown in Table 4.
Table 4
Embodiment 3:
The process of the oil-containing stainless-steel cold-rolling waste water of certain stainless steel factory, day quantity discharged be 5000 tons.Wherein, the water quality situation of the oil-containing stainless-steel cold-rolling waste water of this stainless steel factory is as table 5.
Table 5
Now as follows the oil-containing stainless-steel cold-rolling waste water of this electroplating facility is processed:
After the slagging-off of oil-containing stainless-steel cold-rolling waste water and oil removing, obtain the first pre-treatment oil-containing stainless-steel cold-rolling waste water.
By carrying out oil-containing stainless-steel cold-rolling waste water, except Slag treatment, foreign material larger for volume in oil-containing stainless-steel cold-rolling waste water being removed.
Oil-containing stainless-steel cold-rolling waste water after slagging-off is passed into grease removal tank, by oil-containing stainless-steel cold-rolling waste water after leave standstill 3h after grease removal tank, controlling temperature in grease removal tank is 40 DEG C, the oil slick in oil-containing stainless-steel cold-rolling waste water and the larger oil in water emulsion of particle is made to rise to surface, after collecting surperficial oil reservoir, oil-containing stainless-steel cold-rolling waste water is passed into air flotation pool, by dissolved air flotation process, the oil in water emulsion in removing oil-containing stainless-steel cold-rolling waste water.
First pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out reduction treatment, obtains the second pre-treatment oil-containing stainless-steel cold-rolling waste water.
In the first pre-treatment oil-containing stainless-steel cold-rolling waste water, add concentration is 0.05-5% sulfuric acid, after regulating pH to 3.0, adding concentration toward it is again 10%wt (massfraction) S-WAT, the ORP value containing chromium oil-containing stainless-steel cold-rolling waste water is made to be 280mV, 30min after abundant stirring, makes hexavalent chrome reduction become trivalent chromium.
After second pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out one-level aeration neutralizing treatment, obtain the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
Adding particle diameter toward the second pre-treatment oil-containing stainless-steel cold-rolling waste water is 0.5mm ~ 3mm limestone particle, and gives Air Exposure, and aeration intensity is: 2m
3(air)/m
3(the second pre-treatment oil-containing stainless-steel cold-rolling waste water) h, by the pH regulator to 4.0 of the second pre-treatment cold rolling wastewater, obtains the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water.
3rd pre-treatment oil-containing stainless-steel cold-rolling waste water carried out in secondary and after Air Exposure, obtain the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
The milk of lime that concentration is 5% is added in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, and continue aeration, along with the lasting dropping of milk of lime, the throw out of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water continues to increase and becomes reddish-brown, after the pH regulator to 9.5 of the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water, continue aeration 10 minutes, e.g., aeration intensity is 8m
3(air)/m
3(the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water) h, makes the Fe in the 3rd pre-treatment oil-containing stainless-steel cold-rolling waste water
2+fe is oxidized under the effect of oxygen
3+, and form CaF
2, Fe (OH)
3, Ni (OH)
2, Cr (OH)
3and CaSO
4throw out, obtains the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water.
After being carried out by 4th pre-treatment oil-containing stainless-steel cold-rolling waste water flocculating and precipitate, obtain the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water and the first pre-treatment bed mud.
In the 4th oil-containing stainless-steel cold-rolling waste water, add polymerize aluminum chloride (PAC) is flocculation agent, dosage is 1 ‰ ~ 5 ‰ (thousandths) of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume, after stirring 15min, adding polyacrylamide (PAM) is coagulant aids, and its dosage is 0.1 ‰ of the 4th pre-treatment oil-containing stainless-steel cold-rolling wastewater volume.After flocculation, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water is carried out deposition and leave standstill, heavy metal ion is precipitated completely with the form of oxyhydroxide.Such as, the 4th pre-treatment oil-containing stainless-steel cold-rolling waste water after flocculation is passed into sedimentation tank, and heavy metal ion in the basic conditions, is deposited into the bottom of settling bath with the form of oxyhydroxide.Time of repose is 1h ~ 2h.
By the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water through three grades of neutralizations and after filtering, outer row.
In the 5th pre-treatment oil-containing stainless-steel cold-rolling waste water, add acid, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, make to reach emission standard.
After first pre-treatment bed mud being carried out concentrated and press filtration, obtain the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water and the second pre-treatment bed mud.
The the first pre-treatment bed mud produced is concentrated to concentration basin by sludge pump positive delivery, in the first pre-treatment bed mud, adds PAM with auxiliary mud-water separation.By the first pre-treatment bed mud extracting being carried out pressure rate to pressure filter with pump, the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water obtained flows out under gravity, and the water ratio of the second pre-treatment bed mud after press filtration is less than 35%.
By the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation, three grades of neutralizations and filtration, outer row.
The 6th pre-treatment oil-containing stainless-steel cold-rolling return of waste water after press filtration carries out precipitation process to settling tank, acid is added in the 6th pre-treatment oil-containing stainless-steel cold-rolling waste water after precipitation process, regulate pH to 6.5 ~ 7.2, and filter, by suspended substance removal, reduce its turbidity, guarantee to reach emission standard.
After above-mentioned treatment step, the discharge water obtained after testing after, water quality the results are shown in Table 6.
Table 6
The above embodiment only have expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent should be as the criterion with claims.
Claims (9)
1. an oil-containing stainless-steel cold-rolling wastewater treatment equipment, it is characterized in that, comprise wastewater storage tank, grease removal tank, except chromium groove, the first neutralization tank, the second neutralization tank, flocculation basin, settling tank, concentration basin, storage basin, press filtration pond, backflow pool, the 3rd neutralization tank and filter vat;
Described wastewater storage tank is communicated with described grease removal tank, described grease removal tank is communicated with the described chromium groove that removes, described first neutralization tank is communicated with the described chromium groove that removes, described second neutralization tank is communicated with described first neutralization tank, described flocculation basin is communicated with described second neutralization tank, described settling tank is communicated with described flocculation basin and described concentration basin respectively, described storage basin is communicated with described concentration basin, described press filtration pond is communicated with described storage basin, described backflow pool is communicated with described press filtration pond and described settling tank respectively, described 3rd neutralization tank is communicated with described settling tank, described filter vat is communicated with described 3rd neutralization tank,
Described grease removal tank is provided with at least one vapour pipe, and vapour pipe described in each all has an opening, and the opening surface of described vapour pipe to described go out oil sump opening arrange, for heating the oil reservoir on described grease removal tank surface.
2. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 1, is characterized in that, be also provided with grid in described wastewater storage tank.
3. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 2, is characterized in that, described grid is " H " character form structure.
4. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 1, is characterized in that, described grid is provided with two filter grids.
5. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 4, is characterized in that, two described filter grids are arranged in parallel.
6. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 4, is characterized in that, described filter grid is stainless steel filter grid.
7. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 1, is characterized in that, described removing in chromium groove is provided with whipping appts.
8. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 1, is characterized in that, be provided with central transmission concentrator in described concentration basin.
9. oil-containing stainless-steel cold-rolling wastewater treatment equipment according to claim 1, is characterized in that, is provided with plate-and-frame filter press in described press filtration pond.
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| CN104310651B (en) * | 2014-10-28 | 2016-09-14 | 温玉友 | Oil-containing stainless-steel cold-rolling wastewater treatment equipment and processing method |
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