CN102276121A - Process and system for treating reverse osmosis concentrated water of cold rolling steel mill - Google Patents
Process and system for treating reverse osmosis concentrated water of cold rolling steel mill Download PDFInfo
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- CN102276121A CN102276121A CN 201110211218 CN201110211218A CN102276121A CN 102276121 A CN102276121 A CN 102276121A CN 201110211218 CN201110211218 CN 201110211218 CN 201110211218 A CN201110211218 A CN 201110211218A CN 102276121 A CN102276121 A CN 102276121A
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Abstract
The invention belongs to the technical field of wastewater treatment of metallurgical industry, and particularly relates to a process and a system for treating reverse osmosis concentrated water of a cold rolling steel mill. The process for treating the reverse osmosis concentrated water of the cold rolling steel mill is characterized by comprising the following steps of: 1) allowing the reverse osmosis concentrated water to enter a regulating tank, and allowing the reverse osmosis concentrated water which is treated by the regulating tank to enter an ozone contact reactor; 2) allowing effluent treated by the ozone contact reactor to enter an attenuation tank, allowing wastewater treated by the attenuation tank to enter a membrane biological reaction (MBR) tank, adding powdery active carbon into the MBR tank, pumping effluent subjected to solid-liquid separation by a separation membrane of the MBR tank into an intermediate water production tank by a suction pump to obtain intermediate water; and 3) pumping the intermediate water into a reverse osmosis unit by a high-pressure pump to perform secondary reverse osmosis desalination, wherein the effluent treated by the reverse osmosis unit is used as recycle water, and concentrated water generated by the reverse osmosis unit is discharged directly. The process has the characteristic of high recovery rate of wastewater.
Description
Technical field
The invention belongs to the metallurgy industry technical field of waste water processing, be specifically related to reverse osmosis concentrated water technology of a kind of cold rolling mill and treatment system thereof.
Background technology
Cold rolling production process can produce a large amount of waste water, comprises acidic and alkaline waste water, oil-containing and emulsifying liquid waste water, smooth liquid waste water.Its conventional treatment process is that neutralization reaction, coagulation, air supporting, catalytic oxidation, precipitation, filtration are discharged after reaching wastewater discharge standard, realize energy-saving and emission-reduction, must recycle these water, common technology is to adopt ultrafiltration and reverse osmosis to carry out advanced desalination to handle the back as the recirculated cooling water reuse.Apply to waste water advanced processing at reverse osmosis process and can produce about reverse osmosis concentrated water of about 1/3～1/4 in the actual moving process of reuse again, the COD in such dense water mostly about 200mg/L, can not reach discharging standards.At present, have for the dense water of first-stage reverse osmosis method of disposal commonly used: (1) is used for the direct current spray slag of technique units such as sintering, ironmaking, steel-making, steel rolling or waters and spill terrace etc.; (2) dense water is mixed the back discharging with other water or waste water; (3) to the reverse osmosis concentrated water evaporation drying, moisture is recycled, the solid slag discharging is collected.
Being used for the direct current spray slag of technique units such as sintering, ironmaking, steel-making, steel rolling or watering and spill terrace, be excellent usage really, but simple spray slag water loss is less, and special heat spray slag is handled not all steel mill to be had.
With dense water mixes back discharging meeting directly increasing factory effluent with other water or waste water quantity discharged, do not meet the water-saving policy of country.To the reverse osmosis concentrated water evaporation drying or set up special wastewater treatment equipment, equally also can increase the working cost of construction investment and wastewater treatment.Recycle after adopting the reusing sewage technology with sewage disposal not only can be saved great lot of water resources, and can reduce sewage emissions significantly, thereby be become the emphasis of industrial enterprise's water-saving and emission-reducing.How to improve the rate of recovery of source water, the quantity discharged that reduces reverse osmosis concentrated water is the direction that the water treatment designer explores always.
Summary of the invention
The object of the present invention is to provide reverse osmosis concentrated water technology of a kind of cold rolling mill and treatment system thereof, this technology has the high characteristics of waste water reclamation rate.
For achieving the above object, the technical solution used in the present invention is: the reverse osmosis concentrated water technology of cold rolling mill is characterized in that it comprises the steps:
1) reverse osmosis concentrated water (the dense water of first-stage reverse osmosis) is introduced into equalizing tank, the reverse osmosis concentrated water of regulating after handling through equalizing tank enters the ozone contact reaction device, but with bio-refractory inorganicization of organism in the reverse osmosis concentrated water or be degraded to biochemical substances, larger molecular organics is decomposed into small organic molecule with the strong oxidizing property of ozone;
2) enter the decay pond through the water outlet after the processing of ozone contact reaction device, waste water after handle in the decay pond enters MBR membrane biological reaction pond (or claiming the MBR membrane bioreactor), here the organism in the waste water (i.e. reverse osmosis concentrated water after handle in the overdamping pond) is by the active sludge biodegrade in the MBR membrane biological reaction pond, simultaneously in MBR membrane biological reaction pond, add Powdered Activated Carbon, by a part of organism that is difficult to be degraded by microorganisms of Powdered Activated Carbon absorption, separatory membrane by MBR membrane biological reaction pond carries out water outlet after the solid-liquid separation by producing the pond in the middle of the suction pump suction then, produces water in the middle of obtaining;
3) producing water in the middle of squeezes into the reverse osmosis unit through high-pressure pump and carries out reverse osmosis desalination second time and handle; In the middle of removing, produces this reverse osmosis unit most dissolved salinities in the water, water outlet after handling through the reverse osmosis unit is used [water outlet mixes the back as industrial production repeateds use of purifying waste water with the de-salted water that the first reverse osmosis advanced processing produces, the strong brine COD content of the reverse osmosis desalination processing generation second time can qualified discharge (COD content≤60mg/L)] as reuse water; The dense water (strong brine) that the reverse osmosis unit produces directly discharges.
Hydraulic detention time is 2～5min in the ozone contact reaction device; Filler in the ozone contact reaction device is the plastics of pottery or other anti-ozone oxidation, and packing specific area is 200～300m
2/ m
3
The hydraulic detention time in decay pond is 20～50min;
The dosing method of the Powdered Activated Carbon in the MBR membrane biological reaction pond is directly to add, adding concentration is 0.5g/L～2g/L, when the water outlet (mixed solution) in each discharging MBR membrane biological reaction pond, according to the volume that is discharged, add Powdered Activated Carbon, additional amount still is 0.5g/L～2g/L; MBR separatory membrane in the MBR membrane biological reaction pond is a hollow-fibre membrane, and material is a polyvinylidene difluoride (PVDF), and the pore size of separation membrane surface is 0.1～0.4um; The content of the dissolved oxygen in MBR membrane biological reaction pond (or claiming the MBR biochemical reaction tank) is 2～3mg/L; The hydraulic detention time in MBR membrane biological reaction pond is 6～10 hours; The sludge loading in MBR membrane biological reaction pond: 0.5-0.8kgCOD/kgMLSSd;
The intermittent operation mode is adopted in suction pump, control by the time relay, open 10min (adjustable), stop 4min (adjustable), adopt the intermittent suction operator scheme to be intended to filter by regular stopper film, make to be deposited on the lip-deep mud of film and under hydraulic action, to come off out, the strainability of film is recovered from the film surface.
Described reverse osmosis concentrated water refers to cold rolling wastewater through neutralization reaction, coagulation, air supporting, cooling, biochemical degradation, precipitation, filtration, and follow-up ultrafiltration, first is reverse osmosis advancedly handled the dense water of first-stage reverse osmosis that the back produces.
The reverse osmosis concentrated water treatment system of cold rolling mill is characterized in that it comprises first hydraulic pipe 1, equalizing tank 2, first transferpump 3, second hydraulic pipe 4, ozone contact reaction device 5, the 3rd hydraulic pipe 12, decay pond 13, the 4th hydraulic pipe 14, MBR membrane biological reaction pond 16, suction pump 19, the 5th hydraulic pipe 20, middle pond 21, high-pressure pump 22, the 6th hydraulic pipe 23, the reverse osmosis unit 24 of producing; The input termination reverse osmosis concentrated water of first hydraulic pipe 1 (the dense water of first-stage reverse osmosis), the output terminal of first hydraulic pipe 1 is connected with the input aperture of equalizing tank 2, the input terminus of second hydraulic pipe 4 is connected with the water outlet of equalizing tank 2, the output terminal of second hydraulic pipe 4 is connected with the input aperture of the water distributor 9 of ozone contact reaction device 5, and second hydraulic pipe 4 is provided with first transferpump 3 (being used to promote waste water); The input terminus of the 3rd hydraulic pipe 12 is connected with the water outlet of ozone contact reaction device 5, the output terminal of the 3rd hydraulic pipe 12 with the decay pond 13 the input aperture communicate (output terminal be positioned at the decay pond 13 the top), the input terminus of the 4th hydraulic pipe 14 is connected with the water outlet in decay pond 13, and the output terminal of the 4th hydraulic pipe 14 is connected with the input aperture in MBR membrane biological reaction pond 16; The input terminus of the 5th hydraulic pipe 20 is connected with the water outlet in MBR membrane biological reaction pond 16, and the output terminal of the 5th hydraulic pipe 20 is connected with middle input aperture of producing pond 21, and the 5th hydraulic pipe 20 is provided with suction pump 19; The input terminus of the 6th hydraulic pipe 23 is connected with the middle water outlet that produces pond 21, and the output terminal of the 6th hydraulic pipe 23 is connected with the input aperture of reverse osmosis unit 24, and the 6th hydraulic pipe 23 is provided with high-pressure pump 22.
Described ozone contact reaction device 5 comprises reactor body, the first ozone transfer lime 6, the second ozone transfer lime 7, ozone layer destroying device 8, water distributor 9, ozone contact reaction device filler 10, ozone air distribution plate 11; Water distributor 9, ozone contact reaction device filler 10 and ozone air distribution plate 11 are positioned at reactor body, water distributor 9 is positioned at the top (water distributor is positioned at the intravital top of reactor) of ozone contact reaction device filler 10, ozone air distribution plate 11 is positioned at the below (the ozone air distribution plate is positioned at the intravital bottom of reactor) of ozone contact reaction device filler 10, the input aperture of water distributor is positioned at outside the reactor body, ozone air distribution plate 11 the input aperture be positioned at outside the reactor body; The input termination ozone source (ozone is provided) of the first ozone transfer lime 6, the output terminal of the first ozone transfer lime 6 is connected with the input aperture of ozone air distribution plate 11, the input terminus of the second ozone transfer lime 7 is connected with the ozone outlet at reactor body top, the output terminal of the second ozone transfer lime 7 be connected with the input aperture of ozone layer destroying device 8 (residual ozone that will discharge in the ozone contact reaction device enters atmosphere after destroying, in order to avoid produce secondary pollution).
Ozone contact reaction device filler 10 adopts the plastics of pottery or anti-ozone oxidation, and packing specific area is 200～300m
2/ m
3
Described MBR membrane biological reaction pond 16 comprises reaction tank body, MBR separatory membrane, compressed air inlet pipe 15, aeration head 17, shore pipe 18; MBR separatory membrane and aeration head 17 are positioned at the reaction tank body, and aeration head 17 is positioned at the below (aeration head 17 is positioned at the intravital bottom of reaction tank) of MBR separatory membrane, aeration head 17 be connected with the output terminal of compressed air inlet pipe 15 (generation aeration); The bottom of reaction tank body is provided with shore pipe 18, and shore pipe 18 is provided with valve (spoil disposal regularly).
Described the 6th hydraulic pipe 23 by Y-junction by pipeline be connected with the delivery port of Scale inhibitors throwing device (on the 6th hydraulic pipe, be provided with Scale inhibitors and add a little, on the 6th hydraulic pipe, add Scale inhibitors) by the Scale inhibitors throwing device.
The invention has the beneficial effects as follows: system of the present invention simple in structure, reliable; After the dense water of first-stage reverse osmosis is handled through O3 contacted oxidation-MBR biochemical reaction, can make water outlet COD content≤15mg/L, can effectively guarantee the steady running of follow-up reverse osmosis unit, water outlet after handling through two-pass reverse osmosis can be used as the industrial production recycling of purifying waste water, the rate of recovery that makes whole system is by original 60～70%, bring up to (the present invention has the high characteristics of waste water reclamation rate) more than 90%, and dense water COD content≤60mg/L that two-pass reverse osmosis produces, satisfy emission standard, broken away from the low predicament of the overall rate of recovery of existing cold rolling mill waste water, this technology has tangible economic and social benefit.
Description of drawings
Fig. 1 is a process flow sheet of the present invention;
Among the figure: 1-first hydraulic pipe; The 2-equalizing tank; 3-first transferpump; 4-second hydraulic pipe; 5-ozone contact reaction device; The 6-first ozone transfer lime; The 7-second ozone transfer lime; 8-ozone layer destroying device; The 9-water distributor; 10-ozone contact reaction device filler; 11-ozone air distribution plate; 12-the 3rd hydraulic pipe; The 13-pond of decaying; 14-the 4th hydraulic pipe; The 15-compressed air inlet pipe; 16-MBR membrane biological reaction pond; The 17-aeration head; The 18-shore pipe; The 19-suction pump; 20-the 5th hydraulic pipe; Produce the pond in the middle of the 21-; The 22-high-pressure pump; 23-the 6th hydraulic pipe; 24-reverse osmosis unit.
Embodiment
The reverse osmosis concentrated water technology of cold rolling mill, it comprises the steps:
1) reverse osmosis concentrated water (the dense water of first-stage reverse osmosis) is introduced into equalizing tank (waste water was 4～6 hours equalizing tank residence time, main effect is an anti-shock loading, homogenizing water quality), the reverse osmosis concentrated water of regulating after handling through equalizing tank enters the ozone contact reaction device, but with bio-refractory inorganicization of organism in the reverse osmosis concentrated water or be degraded to biochemical substances, larger molecular organics is decomposed into small organic molecule with the strong oxidizing property of ozone;
2) entering the decay pond through the water outlet after the processing of ozone contact reaction device (indicates, what decay need not add in the pond), behind the overdamping pond, waste water enters MBR membrane biological reaction pond (or claiming the MBR membrane bioreactor), here the organism in the waste water (i.e. reverse osmosis concentrated water after treatment) is by the active sludge biodegrade in the MBR membrane biological reaction pond, simultaneously in MBR membrane biological reaction pond, add Powdered Activated Carbon, by a part of organism that is difficult to be degraded by microorganisms of Powdered Activated Carbon absorption, separatory membrane by MBR membrane biological reaction pond carries out water outlet after the solid-liquid separation by producing the pond in the middle of the suction pump suction then, produces water in the middle of obtaining;
3) producing water in the middle of squeezes into the reverse osmosis unit through high-pressure pump and carries out reverse osmosis desalination second time and handle (the reverse osmosis unit is an existing installation); In the middle of removing, produces this reverse osmosis unit most dissolved salinities in the water, through the water outlet after the processing of reverse osmosis unit (after testing, water outlet COD content≤15mg/L, the rate of recovery of whole system is more than 90%) use as reuse water that [water outlet mixes with the de-salted water that the first reverse osmosis advanced processing produces afterwards as the industrial production repeated use of purifying waste water, the strong brine COD content that produces is handled in reverse osmosis desalination for the second time can qualified discharge (COD content≤60mg/L) after testing ,]; The dense water (strong brine) that the reverse osmosis unit produces directly discharges.
Hydraulic detention time is 2～5min in the ozone contact reaction device; Filler in the ozone contact reaction device is the plastics of pottery or other anti-ozone oxidation, and packing specific area is 200～300m
2/ m
3
The hydraulic detention time in decay pond is 20～50min;
The dosing method of the Powdered Activated Carbon in the MBR membrane biological reaction pond is directly to add, adding concentration is 0.5g/L～2g/L, when the water outlet (mixed solution) in each discharging MBR membrane biological reaction pond, according to the volume that is discharged, add Powdered Activated Carbon, additional amount still is 0.5g/L～2g/L; MBR separatory membrane in the MBR membrane biological reaction pond is a hollow-fibre membrane, and material is a polyvinylidene difluoride (PVDF), and the pore size of separation membrane surface is 0.1～0.4um; The content of the dissolved oxygen in MBR membrane biological reaction pond (or claiming the MBR biochemical reaction tank) is 2～3mg/L; The hydraulic detention time in MBR membrane biological reaction pond is 6～10 hours; The sludge loading in MBR membrane biological reaction pond: 0.5-0.8kgCOD/kgMLSSd;
The intermittent operation mode is adopted in suction pump, control by the time relay, open 10min (adjustable), stop 4min (adjustable), adopt the intermittent suction operator scheme to be intended to filter by regular stopper film, make to be deposited on the lip-deep mud of film and under hydraulic action, to come off out, the strainability of film is recovered from the film surface.
For making the bacterium in the active sludge (active sludge adds in reaction tank) in the MBR membrane biological reaction pond adapt to high salinity environment in the reverse osmosis concentrated water, the active sludge that adds is through the active sludge after the salt tolerant domestication, active sludge can be in the organic waste water of saltiness≤10g/L survival and reproduction.
Active sludge salt tolerant domestication process is as follows:
1) at first measure the salinity (being saltiness) of pending reverse osmosis concentrated water, m (g/L), m≤10g/L usually,
2) selecting 60 days for use is the domestication time, and each domestication period is 6 days, is divided into 10 domestication periods altogether, and waste water salinity of each domestication period is formulated as 0.1m successively; 0.2m; 0.3m ... 0.9m; 1.0m.
3) carry out sludge acclimatization according to above-mentioned water distribution salinity configuration composite waste.
(illustrate: above-mentioned activated sludge acclimatization method belongs to very conventional method)
The ozone layer destroying device of mentioning among the present invention can be used as suite of equipment and buys from the market.
Described reverse osmosis concentrated water refers to cold rolling wastewater through neutralization reaction, coagulation, air supporting, cooling, biochemical degradation, precipitation, filtration, and follow-up ultrafiltration, first is reverse osmosis advancedly handled the dense water of first-stage reverse osmosis that the back produces.
As shown in Figure 1, realize the reverse osmosis concentrated water treatment system of cold rolling mill of above-mentioned technology, it comprises first hydraulic pipe 1, equalizing tank 2, first transferpump 3, second hydraulic pipe 4, ozone contact reaction device 5, the 3rd hydraulic pipe 12, decay pond 13, the 4th hydraulic pipe 14, MBR membrane biological reaction pond 16, suction pump 19, the 5th hydraulic pipe 20, middle pond 21, high-pressure pump 22, the 6th hydraulic pipe 23, the reverse osmosis unit 24 of producing; The input termination reverse osmosis concentrated water of first hydraulic pipe 1 (the dense water of first-stage reverse osmosis), the output terminal of first hydraulic pipe 1 is connected with the input aperture of equalizing tank 2, the input terminus of second hydraulic pipe 4 is connected (preferably bottom or bottom link to each other) with the water outlet of equalizing tank 2, the output terminal of second hydraulic pipe 4 is connected with the input aperture of the water distributor 9 of ozone contact reaction device 5, and second hydraulic pipe 4 is provided with first transferpump 3 (being used to promote waste water); The input terminus of the 3rd hydraulic pipe 12 is connected with the water outlet of ozone contact reaction device 5, the output terminal of the 3rd hydraulic pipe 12 with the decay pond 13 the input aperture communicate (output terminal be positioned at the decay pond 13 the top), the input terminus of the 4th hydraulic pipe 14 is connected with the water outlet in decay pond 13, and the output terminal of the 4th hydraulic pipe 14 is connected with the input aperture in MBR membrane biological reaction pond 16; The input terminus of the 5th hydraulic pipe 20 is connected with the water outlet in MBR membrane biological reaction pond 16, and the output terminal of the 5th hydraulic pipe 20 is connected with middle input aperture of producing pond 21, and the 5th hydraulic pipe 20 is provided with suction pump 19; The input terminus of the 6th hydraulic pipe 23 is connected with the middle water outlet that produces pond 21, and the output terminal of the 6th hydraulic pipe 23 is connected with the input aperture of reverse osmosis unit 24, and the 6th hydraulic pipe 23 is provided with high-pressure pump 22.
Described ozone contact reaction device 5 comprises reactor body, the first ozone transfer lime 6, the second ozone transfer lime 7, ozone layer destroying device 8, water distributor 9, ozone contact reaction device filler 10, ozone air distribution plate 11; Water distributor 9, ozone contact reaction device filler 10 and ozone air distribution plate 11 are positioned at reactor body, water distributor (is made up of a plurality of sprinkler heads, water distribution uniformity) 9 tops (water distributor is positioned at the intravital top of reactor) that are positioned at ozone contact reaction device filler 10, the ozone air distribution plate (is made up of a plurality of jet thrusts, even gas distribution) 11 are positioned at the below (the ozone air distribution plate is positioned at the intravital bottom of reactor) of ozone contact reaction device filler 10, the input aperture of water distributor is positioned at outside the reactor body, ozone air distribution plate 11 the input aperture be positioned at outside the reactor body; The input termination ozone source (ozone is provided) of the first ozone transfer lime 6, the output terminal of the first ozone transfer lime 6 is connected with the input aperture of ozone air distribution plate 11, the input terminus of the second ozone transfer lime 7 is connected with the ozone outlet at reactor body top, the output terminal of the second ozone transfer lime 7 be connected with the input aperture of ozone layer destroying device 8 (residual ozone that will discharge in the ozone contact reaction device enters atmosphere after destroying, in order to avoid produce secondary pollution).
Described MBR membrane biological reaction pond 16 comprises reaction tank body, MBR separatory membrane, compressed air inlet pipe 15, aeration head 17, shore pipe 18; MBR separatory membrane and aeration head 17 are positioned at the reaction tank body, and aeration head 17 is positioned at the below (aeration head 17 is positioned at the intravital bottom of reaction tank) of MBR separatory membrane, aeration head 17 be connected with the output terminal of compressed air inlet pipe 15 (generation aeration); The bottom of reaction tank body is provided with shore pipe 18, and shore pipe 18 is provided with valve (spoil disposal regularly).
Described the 6th hydraulic pipe 23 by Y-junction by pipeline be connected with the delivery port of Scale inhibitors throwing device (on the 6th hydraulic pipe, be provided with Scale inhibitors and add a little, on the 6th hydraulic pipe, add Scale inhibitors) by the Scale inhibitors throwing device.
Working process of the present invention is:
1, cold rolling wastewater is through neutralization reaction, coagulation, air supporting, cooling, biochemical degradation, precipitation, filtration, and follow-up ultrafiltration, first is reverse osmosis advancedly handled the dense water of first-stage reverse osmosis that the back produces and is entered equalizing tank 2 by first hydraulic pipe 1, send in the ozone contact reaction device 5 by first water transfer pump 3 and second hydraulic pipe 4 again, the ozone contact reaction device is a cylindrical reactor, the air distribution plate of bottom adopts the micropore titanium plate aeration, the aperture is 50～80 μ m, is provided with the filler of high-specific surface area in addition in the ozone contact reaction device; In reaction process, reverse osmosis concentrated water (waste water) flows from the top down, ozone gas flows from bottom to top, by air distribution plate ozone gas is evenly spread in the waste water, by the water in the filler cutting dispersion liquid phase, and strengthen liquid phase turbulent fluctuation degree and improve the ozone specific absorption, so that shorten the waste water contact residence time, realize the waste water high-efficiency oxygenation; Here, but the strong oxidizing property of utilizing ozone is decomposed into small organic molecule with larger molecular organics with difficult biochemical substances inorganicization of part in the waste water or be degraded to biochemical substances.
2, enter decay pond 13 through the water outlet after the ozone Oxidation Treatment by 12 gravity flows of the 3rd hydraulic pipe, behind overdamping pond 13, most of residual ozone is decomposed in the water, thereby avoids follow-up MBR biochemical reaction is impacted.
3, water outlet behind overdamping pond 13 is sent into MBR membrane biological reaction pond 16 by the 4th hydraulic pipe 14, here the organism in the waste water is by the active sludge biodegrade in the reaction tank, simultaneously in the membrane biological reaction pond, add Powdered Activated Carbon, the existence of Powdered Activated Carbon has increased the solid-liquid contact area, be adsorbed with microorganism cells at activated carbon surface, enzyme, organism and oxygen, all these is removed for the metabolism of microorganism with to organic biological degradation good environment is provided, also improved the capacity of resisting impact load of system, improved the stability for the treatment of processes, in addition can also be by a part of organism that is difficult to be degraded by microorganisms of Powdered Activated Carbon absorption.In reaction process, be adsorbed fixing on the one hand in the Pollutants Diffusion arrival gac hole, activated carbon adsorptive capacity progressively reduces thereupon, on the other hand, under the thalline effect, be adsorbed pollutent and utilized degraded to enter in the water by diffusion by microorganism, gac progressively recovers again, form a dynamic action period, pollutent this one-period constantly repeatedly in oxidized decomposition.
4, after carrying out solid-liquid separation by separatory membrane under the suction function of suction pump 19, produce pond 21 in the middle of by 20 inputs of the 5th transfer lime through the waste water of above-mentioned biochemical reaction process; The intermittent operation mode is adopted in suction pump 19, control by the time relay, open 10min (adjustable), stop 4min (adjustable), adopt the intermittent suction operator scheme to be intended to filter by regular stopper film, make to be deposited on the lip-deep mud of film and under hydraulic action, to come off out, the strainability of film is recovered from the film surface; Because the absorption and the cohesion of powder activated carbon make gac floc particle particle diameter become big, have improved the sludge filtration performance, by the intermittent operation of suction pump, the development trend that the MBR film that can effectively slow down pollutes.
5, the middle water that produces pond 21 is sent into reverse osmosis unit 24 by high-pressure pump 22 pressurizations by the 6th hydraulic pipe 23, remove the solvability salts substances in the water outlet in MBR membrane biological reaction pond through the reverse osmosis membrane of reverse osmosis unit, further hold back simultaneously and be partly dissolved organic matter matter, guarantee that effectively reverse osmosis produced water satisfies the reuse water requirement; On the 6th transfer lime 23, add simultaneously Scale inhibitors and prevent that the saline crystallization material guarantees that at the reverse osmosis membrane surface scale reverse osmosis system normally moves in the dense water; The product water of reverse osmosis unit can mix with the de-salted water that first-stage reverse osmosis produces afterwards as the industrial production repeated use of purifying waste water; The strong brine that the reverse osmosis unit produces directly discharges.
Claims (10)
1. the reverse osmosis concentrated water technology of cold rolling mill is characterized in that it comprises the steps:
1) reverse osmosis concentrated water is introduced into equalizing tank, the reverse osmosis concentrated water of regulating after handling through equalizing tank enters the ozone contact reaction device, but with bio-refractory inorganicization of organism in the reverse osmosis concentrated water or be degraded to biochemical substances, larger molecular organics is decomposed into small organic molecule with the strong oxidizing property of ozone;
2) enter the decay pond through the water outlet after the processing of ozone contact reaction device, waste water after handle in the decay pond enters MBR membrane biological reaction pond, organism in the waste water is by the active sludge biodegrade in the MBR membrane biological reaction pond, simultaneously in MBR membrane biological reaction pond, add Powdered Activated Carbon, by a part of organism that is difficult to be degraded by microorganisms of Powdered Activated Carbon absorption, separatory membrane by MBR membrane biological reaction pond carries out water outlet after the solid-liquid separation by producing the pond in the middle of the suction pump suction then, produces water in the middle of obtaining;
3) produce water in the middle of and squeeze into the reverse osmosis unit through high-pressure pump and carry out reverse osmosis desalination second time and handle, use as reuse water through the water outlet after the processing of reverse osmosis unit; The dense water that the reverse osmosis unit produces directly discharges.
2. the reverse osmosis concentrated water technology of cold rolling mill according to claim 1 is characterized in that: hydraulic detention time is 2～5min in the ozone contact reaction device; Filler in the ozone contact reaction device is the plastics of pottery or anti-ozone oxidation, and packing specific area is 200～300m
2/ m
3.
3. the reverse osmosis concentrated water technology of cold rolling mill according to claim 1 is characterized in that: the hydraulic detention time in decay pond is 20～50min.
4. the reverse osmosis concentrated water technology of cold rolling mill according to claim 1, it is characterized in that: the dosing method of the Powdered Activated Carbon in the MBR membrane biological reaction pond is directly to add, adding concentration is 0.5g/L～2g/L, when the water outlet in each discharging MBR membrane biological reaction pond, according to the volume that is discharged, add Powdered Activated Carbon, additional amount still is 0.5g/L～2g/L; MBR separatory membrane in the MBR membrane biological reaction pond is a hollow-fibre membrane, and material is a polyvinylidene difluoride (PVDF), and the pore size of separation membrane surface is 0.1～0.4um; The content of the dissolved oxygen in MBR membrane biological reaction pond is 2～3mg/L; The hydraulic detention time in MBR membrane biological reaction pond is 6～10 hours; The sludge loading in MBR membrane biological reaction pond: 0.5-0.8kgCOD/kgMLSSd.
5. the reverse osmosis concentrated water technology of cold rolling mill according to claim 1 is characterized in that: the intermittent operation mode is adopted in suction pump, by time relay control, opens 10min, stops 4min.
6. the reverse osmosis concentrated water technology of cold rolling mill according to claim 1, it is characterized in that: described reverse osmosis concentrated water refers to cold rolling wastewater through neutralization reaction, coagulation, air supporting, cooling, biochemical degradation, precipitation, filtration, and follow-up ultrafiltration, first is reverse osmosis advancedly handled the dense water of first-stage reverse osmosis that the back produces.
7. the reverse osmosis concentrated water treatment system of cold rolling mill as claimed in claim 1 is characterized in that it comprises first hydraulic pipe (1), equalizing tank (2), first transferpump (3), second hydraulic pipe (4), ozone contact reaction device (5), the 3rd hydraulic pipe (12), decay pond (13), the 4th hydraulic pipe (14), MBR membrane biological reaction pond (16), suction pump (19), the 5th hydraulic pipe (20), middle pond (21), high-pressure pump (22), the 6th hydraulic pipe (23), the reverse osmosis unit (24) of producing; The input termination reverse osmosis concentrated water of first hydraulic pipe (1), the output terminal of first hydraulic pipe (1) is connected with the input aperture of equalizing tank (2), the input terminus of second hydraulic pipe (4) is connected with the water outlet of equalizing tank (2), the output terminal of second hydraulic pipe (4) is connected with the input aperture of the water distributor (9) of ozone contact reaction device (5), and second hydraulic pipe (4) is provided with first transferpump (3); The input terminus of the 3rd hydraulic pipe (12) is connected with the water outlet of ozone contact reaction device (5), the output terminal of the 3rd hydraulic pipe (12) communicates with the input aperture in decay pond (13), the input terminus of the 4th hydraulic pipe (14) is connected with the water outlet in decay pond (13), and the output terminal of the 4th hydraulic pipe (14) is connected with the input aperture in MBR membrane biological reaction pond (16); The input terminus of the 5th hydraulic pipe (20) is connected with the water outlet in MBR membrane biological reaction pond (16), and the output terminal of the 5th hydraulic pipe (20) is connected with middle input aperture of producing pond (21), and the 5th hydraulic pipe (20) is provided with suction pump (19); The input terminus of the 6th hydraulic pipe (23) is connected with the middle water outlet that produces pond (21), and the output terminal of the 6th hydraulic pipe (23) is connected with the input aperture of reverse osmosis unit (24), and the 6th hydraulic pipe (23) is provided with high-pressure pump (22).
8. the reverse osmosis concentrated water treatment system of cold rolling mill according to claim 7 is characterized in that: described ozone contact reaction device (5) comprises reactor body, the first ozone transfer lime (6), the second ozone transfer lime (7), ozone layer destroying device (8), water distributor (9), ozone contact reaction device filler (10), ozone air distribution plate (11); Water distributor (9), ozone contact reaction device filler (10) and ozone air distribution plate (11) are positioned at reactor body, water distributor (9) is positioned at the top of ozone contact reaction device filler (10), ozone air distribution plate (11) is positioned at the below of ozone contact reaction device filler (10), the input aperture of water distributor is positioned at outside the reactor body, and the input aperture of ozone air distribution plate (11) is positioned at outside the reactor body; The input termination ozone source of the first ozone transfer lime (6), the output terminal of the first ozone transfer lime (6) is connected with the input aperture of ozone air distribution plate (11), the input terminus of the second ozone transfer lime (7) is connected with the outlet of the ozone at reactor body top, and the output terminal of the second ozone transfer lime (7) is connected with the input aperture of ozone layer destroying device (8).
9. the reverse osmosis concentrated water treatment system of cold rolling mill according to claim 7 is characterized in that: described MBR membrane biological reaction pond (16) comprises reaction tank body, MBR separatory membrane, compressed air inlet pipe (15), aeration head (17), shore pipe (18); MBR separatory membrane and aeration head (17) are positioned at the reaction tank body, and aeration head (17) is positioned at the below of MBR separatory membrane, and aeration head (17) is connected with the output terminal of compressed air inlet pipe (15); The bottom of reaction tank body is provided with shore pipe (18), and shore pipe (18) is provided with valve.
10. the reverse osmosis concentrated water treatment system of cold rolling mill according to claim 7 is characterized in that: described the 6th hydraulic pipe (23) is connected by the delivery port of pipeline with the Scale inhibitors throwing device by Y-junction.
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