CN104710048B - A kind of technique of zero discharge for Treatment of Metal Surface waste water - Google Patents
A kind of technique of zero discharge for Treatment of Metal Surface waste water Download PDFInfo
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Abstract
The invention discloses a kind of technique of zero discharge for Treatment of Metal Surface waste water, by waste water through oil removal process, dosing reaction at oil removal regulating reservoir is formed mud mixture, then is delivered to by mud mixture in the muddy water tank of solid-liquid separator；Mud mixture in muddy water tank is easily separated in solid-liquid separation pipe, separates the clear water obtained and flow to reuse pool, pulls back to after neutrality for workshop reuse through pH value, separates remaining mud mixture and is back to muddy water tank precipitation concentration formation muddy water concentrate。Muddy water concentrate is deposited in the bottom of muddy water tank, in cake process processed, extracting muddy water concentrate from the bottom of muddy water tank and carry out filter-press dehydration to filter press, filtrate is back to oil removal regulating reservoir and again processes, and the mud cake then outer unit being transported to qualification process carries out trust process。It is an advantage of the current invention that: technological process is simple, and input cost is low, stable, safeguard simple, really realize the zero-emission of Treatment of Metal Surface waste water。
Description
Technical field
The present invention relates to the technical field administering Treatment of Metal Surface waste water, specifically a kind of technique of zero discharge for Treatment of Metal Surface waste water。
Background technology
Containing the harmful substances such as phosphorus, iron ion, zinc, nickel, chromium, ammonia nitrogen in Treatment of Metal Surface waste water, water, soil can be caused severe contamination by its direct discharge。
The general technology flow process administering Treatment of Metal Surface waste water is: waste water is after oil removal, dosing reaction, sand filtration, carbon filter, ion exchange and RO reverse osmosis membrane stepwise disposal, then carries out sludge press filtration；The clear water obtained after ion exchange and RO reverse osmosis membrane collects reuse, and dense water is back to oil interceptor again, realizes the zero-emission on whole procedural theory。
But only there is the probability of zero-emission in theory in existing process technique, in actual application and zero-emission cannot be accomplished。It there is problems in that
One, complex process: it relates to oil removal, dosing reaction, sand filtration, carbon filter, ion exchange and RO, six process above links of sludge press filtration, and process step is many, and occupation area of equipment is big, and input cost is high, complex operation。
Two, in wastewater treatment process, the easy fouling of face (includes CaCO3, CaSO4, SrSO4, CaF2, SiO2, ferrum, aluminum oxide etc. to deposit at face), very easily there is blocking breakage in ion exchange membrane and RO reverse osmosis membrane, and recovers difficulty, maintenance cost height；Wastewater treatment sustainability is poor。
Three, the dense water produced due to ion exchange membrane and RO reverse osmosis membrane to come back in oil removal regulating reservoir, along with dense water constantly accumulates, oil removal regulating reservoir waste strength can be caused constantly to raise, when waste strength exceedes PROCESS FOR TREATMENT ability, treatment facility can be caused to paralyse。Being processed by ion exchange membrane, the utilization rate of former water can only achieve 75% ~ 80%, and all the other are then the dense water produced, so must be diluted dense water or arrange outward ensureing the properly functioning for the treatment of facility, it is impossible to be fully achieved the zero-emission on practical significance。
As certain waste water treatment plant implements conventional processes, invest 550,000 yuan of building equipments, and operating cost is up to 24 yuan/ton, along with the dense water of oil removal regulating reservoir constantly accumulates, oil removal regulating reservoir waste strength is caused constantly to raise, run up to a certain degree, exceeded PROCESS FOR TREATMENT ability, have resulted in the paralysis for the treatment of facility。
Summary of the invention
The purpose of the present invention is to make up above-mentioned deficiency, and simple to the open a kind of technological process of society, input cost is low, stable, safeguards the technique of zero discharge being simply to Treatment of Metal Surface waste water。
The technical scheme is that and be achieved in that:
A kind of technique of zero discharge for Treatment of Metal Surface waste water, comprises the following steps:
Step one, oil removal: Treatment of Metal Surface waste water through the modified tune amount 6 ~ 8h of oil removal regulating reservoir oil removal, is collected waste oil that oil removal regulating reservoir upper strata floats and focuses on, arrange aeration tube in oil removal regulating reservoir and carry out aeration and make Fe2+It is oxidized to Fe3+；
Step 2, dosing reaction: add flocculant calcium hydroxide and polyacrylamide, the addition of calcium hydroxide is for regulating pH value of waste water to 11 ~ 12, the addition of polyacrylamide is 1 ~ 5mg/L, forms mud mixture after waste water dosing reaction, and mud mixture is from flowing in the muddy water tank of solid-liquid separator；
Step 3, solid-liquid separation: mud mixture is pumped into solid-liquid separation pipe by booster pump in the middle part of muddy water tank, separate the clear water obtained and flow to reuse pool,PH value is pulled back to reuse after neutrality, separates remaining mud mixture and be back to muddy water tank precipitation concentration and form muddy water concentrate；
Solid-liquid separation pipe in described solid-liquid separator is connected in sequence by high pressure separation pipe, described high pressure separation pipe includes housing and the Ultra filtration membrane pipe being placed in housing, described Ultra filtration membrane pipe is made up of ultrafilter membrane, described Ultra filtration membrane pipe is distributed the aperture having diameter to be 0.1um, at normal temperatures and pressures, described aperture is in closure state, when mud mixture is pumped into solid-liquid separation pipe by booster pump,Under pressure, described aperture is opened；
Step 4, filter pressing cake: extracted muddy water concentrate by membrane pump from the bottom of described muddy water tank and carry out filter-press dehydration to filter press, make mud cake, filtrate is back to oil removal regulating reservoir and again processes, and the mud cake then outer unit being transported to qualification process carries out trust process。
The measure optimizing the technical program further is:
The percent opening of described Ultra filtration membrane pipe is more than the 75% of surface area。
Described solid-liquid separator mainly includes muddy water tank, solid-liquid separation pipe, clear water water producing pipe, tap water water inlet pipe, high-pressure pipe, hydrochloric acid cleans water tank and sodium hypochlorite cleans water tank；Described muddy water tank is connected by the import of muddy water input pipe with the solid-liquid separation pipe being mainly made up of Ultra filtration membrane pipe, the outlet of described solid-liquid separation pipe is by muddy water return duct tieback to described muddy water tank, described muddy water input pipe is connected to booster pump, described solid-liquid separation pipe is connected to clear water water producing pipe, described clear water water producing pipe multiparity water outlet pipe, produce water backwash post to be connected with Graceful water pipe, described solid-liquid separation pipe is connected to tap water water inlet pipe, this tap water water inlet pipe is provided with tap water inlet valve, described tap water water inlet pipe is connected to muddy water end blow-down pipe, this muddy water end blow-down pipe is provided with muddy water end blow-down pipe valve, described product water outlet pipe is connected to clear water end blow-down pipe, this clear water end blow-down pipe is provided with clear water end blow-down pipe valve；The described upper end producing water backwash post is connected to high-pressure pipe, and this high-pressure pipe is provided with gases at high pressure solenoid purge valve, and the upper end of described clear water water producing pipe is connected to exhaustor；
Liquid medicine flushing water pump cleans pipe by hydrochloric acid and is connected with hydrochloric acid cleaning water tank, described hydrochloric acid cleans and is provided with hydrochloric acid cleaning water inlet tube valve on pipe, described solid-liquid separation pipe is connected to cleaning liquid medicine return duct, this cleaning liquid medicine return duct cleans return duct by hydrochloric acid and is back to described hydrochloric acid cleaning water tank, described hydrochloric acid cleans and is provided with hydrochloric acid cleaning return duct valve on return duct, and described product water outlet pipe cleans return duct by clear water end hydrochloric acid and is back to described hydrochloric acid cleaning water tank；
Described liquid medicine flushing water pump cleans pipe by sodium hypochlorite and is connected with sodium hypochlorite cleaning water tank, described sodium hypochlorite cleans and is provided with sodium hypochlorite cleaning water inlet tube valve on pipe, described cleaning liquid medicine return duct cleans return duct by sodium hypochlorite and is back to described sodium hypochlorite cleaning water tank, described sodium hypochlorite cleans and is provided with sodium hypochlorite cleaning return duct valve on return duct, and described product water outlet pipe cleans return duct by clear water end sodium hypochlorite and is back to described sodium hypochlorite cleaning water tank；
The bottom of described muddy water tank is provided with mud discharging pipe。
It is formed with muddy water passage in described Ultra filtration membrane pipe, the two ends of described Ultra filtration membrane pipe are respectively arranged with muddy water import and muddy water outlet, it is formed with water-dilution channel outside described Ultra filtration membrane pipe, arranging clear water output on described housing, described clear water output is connected with described clear water water producing pipe。
The deflector making mud mixture be swirling flowing it is provided with in described solid-liquid separation pipe。
Described Graceful water pipe is provided with product water ga(u)ge。
After the every properly functioning 30min of described solid-liquid separator, with gases at high pressure air purge 30s。
Described hydrochloric acid cleans in water tank and holds the hydrochloric acid that concentration is 10%, and hydrochloric acid scavenging period is 30min。
Described sodium hypochlorite cleans in water tank and holds the sodium hypochlorite that concentration is 10%, and sodium hypochlorite scavenging period is 30min。
The technique of zero discharge of the present invention includes oil removal, dosing reaction, solid-liquid separation, four steps of filter pressing cake, and technique is simple, and floor space is little, and input cost is low, the situation being not susceptible to solid-liquid separating equipment blocking breakage and causing whole technological process to be interrupted。The mud mixture formed after waste water oil removal, dosing reaction is carried out solid-liquid separation by the present invention, separate the clear water obtained and be collected in reuse pool, and concentrate recirculation to muddy water tank precipitates, concentration, the clear water in reuse pool pulls back to after neutrality for workshop reuse through pH value；The muddy water concentrate of muddy water pot bottom is extracted to filter press and carries out filter-press dehydration, makes mud cake, and filtrate is back to oil removal regulating reservoir and again processes, and the mud cake then outer unit being transported to qualification process carries out trust process。This Process for Effluent water quality reaches " the industrial water quality of urban sewage reutilization " (GB/T19923-2005) standard, and 100% is back to production, produces without dense water, accomplished zero-emission truly in whole processing procedure。
The present invention produces the upper end of water backwash post and is connected to high-pressure pipe, this high-pressure pipe is provided with gases at high pressure solenoid purge valve, the upper end of described clear water water producing pipe is connected to exhaustor, at set intervals Ultra filtration membrane pipe is implemented gases at high pressure backwash, the pollutant got lodged on Ultra filtration membrane pipe are recoiled into muddy water end, make Ultra filtration membrane pipe can remain good working order, to guarantee the high efficiency of solid-liquid separation。
Solid-liquid separation pipe is connected to tap water water inlet pipe, described tap water water inlet pipe is connected to muddy water end blow-down pipe, described product water outlet pipe is connected to clear water end blow-down pipe, the clear water rinsing solid-liquid separation pipe uses the pressure of tap water, both the energy had been saved, eliminate again suction pump, reduce cost, also help working specification。Because clear water rinses the medicinal liquid in main wash Ultra filtration membrane pipe, incidentally rinse the medicinal liquid outside clear water end-Ultra filtration membrane pipe, clean water without the need for very big pressure。
Accompanying drawing explanation
Fig. 1 is the process chart of the embodiment of the present invention one；
Fig. 2 is the structural representation of the embodiment of the present invention one solid-liquid separator；
Fig. 3 is the rearview of Fig. 2；
Fig. 4 is the structural representation of Fig. 2 mesohigh separation pipe；
Fig. 5 is the top view of muddy water tank in Fig. 2；
Fig. 6 is the process chart of the embodiment of the present invention two。
Detailed description of the invention
In accompanying drawing of the present invention, the title of each accompanying drawing labelling is:
Muddy water tank 1, guide shell 1a, mozzle 1b, booster pump 2, muddy water import check valve 3, muddy water input pipe 4, muddy water imported valve 4a, solid-liquid separation pipe 5, deflector 5a, housing 51, clear water output 51a, Ultra filtration membrane pipe 52, muddy water import 52a, muddy water outlet 52b, muddy water return duct 6, muddy water return duct valve 6a, clear water water producing pipe 7, produce water outlet pipe 8, produce water backwash post 9, high-pressure pipe 10, gases at high pressure solenoid purge valve 10a, produce water electrodynamic valve 11, Graceful water pipe 12, produce water ga(u)ge 13, clear water end hydrochloric acid cleans return duct 14, clear water end sodium hypochlorite cleans return duct 15, exhaustor 16, hydrochloric acid cleans water tank 17, sodium hypochlorite cleans water tank 18, liquid medicine flushing water pump 19, sodium hypochlorite cleans pipe 20, sodium hypochlorite cleans water inlet tube valve 20a, hydrochloric acid cleans pipe 21, hydrochloric acid cleans water inlet tube valve 21a, clean liquid medicine outlet pipe main valve 22, clean liquid medicine return duct 23, clean liquid medicine return duct main valve 24, hydrochloric acid cleans return duct 25, hydrochloric acid cleans return duct valve 25a, sodium hypochlorite cleans return duct 26, sodium hypochlorite cleans return duct valve 26a, tap water water inlet pipe 27, tap water inlet valve 27a, muddy water end blow-down pipe 28, muddy water end blow-down pipe valve 28a, clear water end blow-down pipe 29, clear water end blow-down pipe valve 29a, mud discharging pipe 30。
Below in conjunction with accompanying drawing, the present invention is described in further detail:
Embodiment one:
A kind of technique of zero discharge for Treatment of Metal Surface waste water, comprises the following steps:
Step one, oil removal: Treatment of Metal Surface waste water through the modified tune amount 6 ~ 8h of oil removal regulating reservoir oil removal, is collected waste oil that oil removal regulating reservoir upper strata floats and focuses on, arrange aeration tube in oil removal regulating reservoir and carry out aeration and make Fe2+It is oxidized to Fe3+；
Fe(OH)2And unstable, it is therefore desirable to by Fe2+It is oxidized to Fe3+, after dosing reaction, stable Fe (OH) could be formed3；
Step 2, dosing reaction: add flocculant calcium hydroxide and polyacrylamide, the addition of calcium hydroxide is for regulating pH value of waste water to 11 ~ 12, the addition of polyacrylamide is 1 ~ 5mg/L, forms mud mixture after waste water dosing reaction, and mud mixture is from flowing in the muddy water tank of solid-liquid separator；And calcium hydroxide can form stable di calcium deposit with phosphate anion, effectively reduces total phosphorus；
Step 3, solid-liquid separation: mud mixture is pumped into solid-liquid separation pipe 5 by booster pump in the middle part of muddy water tank, separate the clear water obtained and flow to reuse pool,PH value is pulled back to reuse after neutrality, separates remaining mud mixture and be back to muddy water tank precipitation concentration and form muddy water concentrate；
Solid-liquid separation pipe 5 in described solid-liquid separator is connected in sequence by high pressure separation pipe, described high pressure separation pipe 5 includes housing 51 and the Ultra filtration membrane pipe 52 being placed in housing 51, described Ultra filtration membrane pipe 52 is made up of ultrafilter membrane, described Ultra filtration membrane pipe 52 is distributed the aperture having diameter to be 0.1um, at normal temperatures and pressures, described aperture is in closure state, when mud mixture is pumped into solid-liquid separation by booster pumpPipe 5, under pressure, described aperture is opened；This pressure is provided by booster pump, is about 7 atmospheric pressure, i.e. 0.7MPa；
Step 4, filter pressing cake: extracted muddy water concentrate by membrane pump from the bottom of muddy water tank and carry out filter-press dehydration to filter press, make mud cake, filtrate is back to oil removal regulating reservoir and again processes, and the mud cake then outer unit being transported to qualification process carries out trust process。
The percent opening of described Ultra filtration membrane pipe 52 is more than the 75% of surface area。
Described solid-liquid separator mainly includes muddy water tank 1, solid-liquid separation pipe 5, clear water water producing pipe 7, tap water water inlet pipe 27, high-pressure pipe 10, hydrochloric acid cleans water tank 17 and sodium hypochlorite cleans water tank 18；Described muddy water tank 1 is connected by the import of muddy water input pipe 4 with the solid-liquid separation pipe 5 being mainly made up of Ultra filtration membrane pipe 52, the outlet of described solid-liquid separation pipe 5 is by muddy water return duct 6 tieback to described muddy water tank 1, described muddy water input pipe 4 is connected to booster pump 2, described solid-liquid separation pipe 5 is connected to clear water water producing pipe 7, described clear water water producing pipe 7 multiparity water outlet pipe 8, produce water backwash post 9 to be connected with Graceful water pipe 12, described solid-liquid separation pipe 5 is connected to tap water water inlet pipe 27, this tap water water inlet pipe 27 is provided with tap water inlet valve 27a, described tap water water inlet pipe 27 is connected to muddy water end blow-down pipe 28, this muddy water end blow-down pipe 28 is provided with muddy water end blow-down pipe valve 28a, described product water outlet pipe is connected to clear water end blow-down pipe 29, this clear water end blow-down pipe 29 is provided with clear water end blow-down pipe valve 29a；The described upper end producing water backwash post 9 is connected to high-pressure pipe 10, and this high-pressure pipe 10 is provided with gases at high pressure solenoid purge valve 10a, and the upper end of described clear water water producing pipe 7 is connected to exhaustor 16；
Liquid medicine flushing water pump 19 cleans pipe 21 by hydrochloric acid and is connected with hydrochloric acid cleaning water tank 17, described hydrochloric acid cleans and is provided with hydrochloric acid cleaning water inlet tube valve 21a on pipe 21, described solid-liquid separation pipe 5 is connected to cleaning liquid medicine return duct 23, this cleaning liquid medicine return duct 23 cleans return duct 25 by hydrochloric acid and is back to described hydrochloric acid cleaning water tank 17, described hydrochloric acid cleans and is provided with hydrochloric acid cleaning return duct valve 25a on return duct 25, and described product water outlet pipe 8 cleans return duct 14 by clear water end hydrochloric acid and is back to described hydrochloric acid cleaning water tank 17；
Described liquid medicine flushing water pump 19 cleans pipe 20 by sodium hypochlorite and is connected with sodium hypochlorite cleaning water tank 18, described sodium hypochlorite cleans and is provided with sodium hypochlorite cleaning water inlet tube valve 20a on pipe 20, described cleaning liquid medicine return duct 23 cleans return duct 26 by sodium hypochlorite and is back to described sodium hypochlorite cleaning water tank 18, described sodium hypochlorite cleans and is provided with sodium hypochlorite cleaning return duct valve 26a on return duct 26, and described product water outlet pipe 8 cleans return duct 15 by clear water end sodium hypochlorite and is back to described sodium hypochlorite cleaning water tank 18；
The bottom of described muddy water tank 1 is provided with mud discharging pipe 30。
Above-mentioned muddy water input pipe 4 is provided with muddy water imported valve 4a, described muddy water return duct 6 is provided with muddy water return duct valve 6a, Graceful water pipe 12 is provided with product water electrodynamic valve 11；Liquid medicine flushing water pump 19 is provided with cleaning liquid medicine outlet pipe main valve 22, cleans and liquid medicine return duct 23 is provided with cleaning liquid medicine return duct main valve 24。
Above-mentioned tap water water inlet pipe 27 is provided with tap water inlet valve 27a, muddy water end blow-down pipe 28 is provided with muddy water end blow-down pipe valve 28a, clear water end blow-down pipe 29 is provided with clear water end blow-down pipe valve 29a；Muddy water input pipe 4 is provided with muddy water import check valve 3。
It is formed with muddy water passage in described Ultra filtration membrane pipe 52, the two ends of described Ultra filtration membrane pipe 52 are respectively arranged with muddy water import 52a and muddy water outlet 52b, it is formed with water-dilution channel outside described Ultra filtration membrane pipe 52, arranging clear water output 51a on described housing 51, described clear water output 51a is connected with described clear water water producing pipe 7。
The deflector 5a making mud mixture be swirling flowing it is provided with in described solid-liquid separation pipe 5。
Described Graceful water pipe 12 is provided with product water ga(u)ge 13。
After the every properly functioning 30min of described solid-liquid separator, with gases at high pressure air purge 30s。
Described hydrochloric acid cleans in water tank 17 and holds the hydrochloric acid that concentration is 10%, and hydrochloric acid scavenging period is 30min。
Described sodium hypochlorite cleans in water tank 18 and holds the sodium hypochlorite that concentration is 10%, and sodium hypochlorite scavenging period is 30min。
Described dosing reaction carries out in the guide shell 1a of muddy water tank 1, and this guide shell 1a arranges mozzle 1b, described mozzle 1b and the described tangent setting of guide shell 1a, and waste water is that swirling flows into when sending into guide shell 1a from mozzle 1b。Waste water is that swirling flows into, and plays stirring action, thus accelerating the carrying out of dosing reaction。
Muddy water tank 1 in the present embodiment is provided with guide shell 1a, mozzle 1b, makes muddy water tank 1 serve not only as the container storing mud mixture, also multi-use, and the sedimentation tank serving not only as mud mixture precipitation concentration is used,And the reaction tank as dosing reaction is used；It is greatly saved the space of equipment, reduces cost。
Operation principle:
Waste water is delivered to muddy water tank at oil removal regulating reservoir after oil removal processes, and completes dosing reaction formation mud mixture in the guide shell 1a of muddy water tank 1。Mud mixture in muddy water tank is in solid-liquid separationPipe 5In be easily separated, obtain two parts after separation: one, separate the clear water that obtains and flow to reuse pool, pull back to after neutrality for workshop reuse through pH value；Two, separate remaining mud mixture and be back to muddy water tank precipitation concentration formation muddy water concentrate。
Muddy water concentrate is deposited in the bottom of muddy water tank, in cake process processed, extracting muddy water concentrate from the bottom of muddy water tank and carry out filter-press dehydration to filter press, filtrate is back to oil removal regulating reservoir and again processes, and the mud cake then outer unit being transported to qualification process carries out trust process。
Whole process does not have outside waste water to arrange, and Process for Effluent water quality reaches " the industrial water quality of urban sewage reutilization " (GB/T19923-2005) standard, and 100% is back to production, has been truly realized zero-emission。
Solid-liquid separation flow process: the mud mixture in muddy water tank 1 is under booster pump 2 acts on, solid-liquid separation pipe 5 is entered through muddy water input pipe 4, muddy water muddy water passage from solid-liquid separation pipe 5 passes through in swirling, moisture in muddy water passes through Ultra filtration membrane pipe 52, flowing out from clear water output 51a, collect, produced clear water is through clear water water producing pipe 7, product water outlet pipe 8, product water backwash post 9、Produce water electrodynamic valve 11, produce water ga(u)ge 13, finally drained into reuse pool by Graceful water pipe 12；And the residue muddy water in Ultra filtration membrane pipe 52 is back to described muddy water tank 1 through muddy water return duct 6。
In order to ensure that solid-liquid separator can run steadily in the long term, it is automatically switched off by robot control system(RCS) after properly functioning 30min, open gases at high pressure solenoid purge valve 10a, recoil 30s with gases at high pressure, gases at high pressure enter solid-liquid separation pipe 5 clear water end by gases at high pressure solenoid purge valve 10a, product water backwash post 9, product water outlet pipe 8 and clear water water producing pipe 7, being recoiled by the pollutant got lodged on Ultra filtration membrane pipe 52 into muddy water end, excessive gas is discharged by exhaustor 16。
Robot control system(RCS) is automatic: when gases at high pressure solenoid purge valve 10a opens, and produces water electrodynamic valve 11 and booster pump 2 cuts out；And producing water electrodynamic valve 11 and when booster pump 2 opens, gases at high pressure solenoid purge valve 10a closes。
After solid-liquid separator runs a period of time, carrying out medicament flushing, medicament flushing process is as follows: clean 30min initially with hydrochloric acid that concentration is 10%, then with tap water clean after, 30min is cleaned again with the sodium hypochlorite that concentration is 10%, finally clean with tap water again。The purpose that medicament rinses is not by tamper that high-pressure purge is clean in dissolving ultrafiltration film；Usual equipment carries out a medicament after running one week and rinses, depending on the water outlet efficiency of solid-liquid separation pipe 5。
Hydrochloric acid cleaning process: the hydrochloric acid that hydrochloric acid cleans in water tank 17 enters device from hydrochloric acid cleaning pipe 21 through liquid medicine flushing water pump 19, and solid-liquid separation pipe 5 is carried out；Hydrochloric acid initially enters the muddy water end of solid-liquid separation pipe 5, and part hydrochloric acid enters clear water end through ultrafilter membrane。The hydrochloric acid solution of muddy water end is back to hydrochloric acid cleaning water tank 17 from cleaning liquid medicine return duct 23 through hydrochloric acid cleaning return duct 25；The hydrochloric acid solution of clear water end cleans return duct 14 through clear water end hydrochloric acid and is back to hydrochloric acid cleaning water tank 17。
Tap water cleaning process: tap water enters in device from tap water water inlet pipe 27, is rinsed solid-liquid separation pipe 5；Tap water initially enters the muddy water end of solid-liquid separation pipe 5, and part of running water enters clear water end through ultrafilter membrane under hydraulic pressure effect。The tap water of muddy water end flow to muddy water tank 1, and after running water valve is closed, the tap water of muddy water end flow to oil removal regulating reservoir through muddy water end blow-down pipe 28；The tap water of clear water end is back to oil removal regulating reservoir through clear water end blow-down pipe 29。
Sodium hypochlorite cleaning process: the sodium hypochlorite that sodium hypochlorite cleans in water tank 18 enters device from sodium hypochlorite cleaning pipe 20 through liquid medicine flushing water pump 19, and solid-liquid separation pipe 5 is carried out；Sodium hypochlorite initially enters the muddy water end of solid-liquid separation pipe 5, and part sodium hypochlorite enters clear water end through ultrafilter membrane。The cleaned liquid medicine return duct 23 of sodium hypochlorite of muddy water end cleans return duct 26 from sodium hypochlorite and is back to sodium hypochlorite cleaning water tank 18；The sodium hypochlorite of clear water end cleans return duct 15 from clear water end sodium hypochlorite and is back to sodium hypochlorite cleaning water tank 18。
After sodium hypochlorite has cleaned, again clean up with tap water。
In whole cleaning process, hydrochloric acid solution and liquor natrii hypochloritis recycle, and the tap water after cleaning is back to muddy water tank 1 or oil removal regulating reservoir, and does not externally discharge, it is to avoid the pollution to environment。
Embodiment two:
In the present embodiment and embodiment one the difference is that, dosing reaction carries out in dosing reaction tank, and waste water is dosing reaction in dosing reaction tank, and stops 15 minutes wherein to ensure that it fully reacts, and reacted waste water pumps in muddy water tank 1 again。
Claims (9)
1. the technique of zero discharge for Treatment of Metal Surface waste water, it is characterised in that: comprise the following steps:
Step one, oil removal: Treatment of Metal Surface waste water through the modified tune amount 6 ~ 8h of oil removal regulating reservoir oil removal, is collected waste oil that oil removal regulating reservoir upper strata floats and focuses on, arrange aeration tube in oil removal regulating reservoir and carry out aeration and make Fe2+It is oxidized to Fe3+；
Step 2, dosing reaction: add flocculant calcium hydroxide and polyacrylamide, the addition of calcium hydroxide is for regulating pH value of waste water to 11 ~ 12, the addition of polyacrylamide is 1 ~ 5mg/L, forms mud mixture after waste water dosing reaction, and mud mixture flow in the muddy water tank of solid-liquid separator；
Step 3, solid-liquid separation: mud mixture is pumped into solid-liquid separation pipe (5) by booster pump in the middle part of muddy water tank, separate the clear water obtained and flow to reuse pool,PH value is pulled back to reuse after neutrality, separates remaining mud mixture and be back to muddy water tank precipitation concentration and form muddy water concentrate；
Solid-liquid separation pipe (5) in described solid-liquid separator is connected in sequence by high pressure separation pipe, described high pressure separation pipe includes housing (51) and the Ultra filtration membrane pipe (52) being placed in housing (51), described Ultra filtration membrane pipe (52) is made up of ultrafilter membrane, described Ultra filtration membrane pipe (52) is above distributed the aperture having diameter to be 0.1um, at normal temperatures and pressures, described aperture is in closure state, when mud mixture is pumped into solid-liquid separation pipe (5) by booster pump, under pressure, described aperture is opened；
Described solid-liquid separator mainly includes muddy water tank (1), solid-liquid separation pipe (5), clear water water producing pipe (7), tap water water inlet pipe (27), high-pressure pipe (10), hydrochloric acid cleans water tank (17) and sodium hypochlorite cleans water tank (18)；Described muddy water tank (1) is connected by the import of muddy water input pipe (4) with the solid-liquid separation pipe (5) being mainly made up of Ultra filtration membrane pipe (52), the outlet of described solid-liquid separation pipe (5) is by muddy water return duct (6) tieback to described muddy water tank (1), described muddy water input pipe (4) is connected to booster pump (2), described solid-liquid separation pipe (5) is connected to clear water water producing pipe (7), described clear water water producing pipe (7) multiparity water outlet pipe (8), produce water backwash post (9) to be connected with Graceful water pipe (12), described solid-liquid separation pipe (5) is connected to tap water water inlet pipe (27), this tap water water inlet pipe (27) is provided with tap water inlet valve (27a), described tap water water inlet pipe (27) is connected to muddy water end blow-down pipe (28), this muddy water end blow-down pipe (28) is provided with muddy water end blow-down pipe valve (28a), described product water outlet pipe (8) is connected to clear water end blow-down pipe (29), this clear water end blow-down pipe (29) is provided with clear water end blow-down pipe valve (29a)；The upper end of described product water backwash post (9) is connected to high-pressure pipe (10), being provided with gases at high pressure solenoid purge valve (10a) on this high-pressure pipe (10), the upper end of described clear water water producing pipe (7) is connected to exhaustor (16)；
Liquid medicine flushing water pump (19) cleans pipe (21) by hydrochloric acid and is connected with hydrochloric acid cleaning water tank (17), described hydrochloric acid cleans and is provided with hydrochloric acid cleaning water inlet tube valve (21a) on pipe (21), described solid-liquid separation pipe (5) is connected to cleaning liquid medicine return duct (23), this cleaning liquid medicine return duct (23) is cleaned return duct (25) by hydrochloric acid and is back to described hydrochloric acid cleaning water tank (17), described hydrochloric acid cleans and is provided with hydrochloric acid cleaning return duct valve (25a) on return duct (25), described product water outlet pipe (8) cleans return duct (14) by clear water end hydrochloric acid and is back to described hydrochloric acid cleaning water tank (17)；
Described liquid medicine flushing water pump (19) cleans pipe (20) by sodium hypochlorite and is connected with sodium hypochlorite cleaning water tank (18), described sodium hypochlorite cleans and is provided with sodium hypochlorite cleaning water inlet tube valve (20a) on pipe (20), described cleaning liquid medicine return duct (23) is cleaned return duct (26) by sodium hypochlorite and is back to described sodium hypochlorite cleaning water tank (18), described sodium hypochlorite cleans and is provided with sodium hypochlorite cleaning return duct valve (26a) on return duct (26), described product water outlet pipe (8) cleans return duct (15) by clear water end sodium hypochlorite and is back to described sodium hypochlorite cleaning water tank (18)；
The bottom of described muddy water tank (1) is provided with mud discharging pipe (30)；
Step 4, filter pressing cake: extracted muddy water concentrate by membrane pump from the bottom of muddy water tank and carry out filter-press dehydration to filter press, make mud cake, filtrate is back to oil removal regulating reservoir and again processes, and the mud cake then outer unit being transported to qualification process carries out trust process。
2. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 1, it is characterised in that: the percent opening of described Ultra filtration membrane pipe (52) is more than the 75% of surface area。
3. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 2, it is characterized in that: in described Ultra filtration membrane pipe (52), be formed with muddy water passage, the two ends of described Ultra filtration membrane pipe (52) are respectively arranged with muddy water import (52a) and muddy water outlet (52b), it is formed with water-dilution channel outside described Ultra filtration membrane pipe (52), arranging clear water output (51a) on described housing (51), described clear water output (51a) is connected with described clear water water producing pipe (7)。
4. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 3, it is characterised in that: it is provided with the deflector (5a) making mud mixture be swirling flowing in described solid-liquid separation pipe (5)。
5. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 4, it is characterised in that: described Graceful water pipe (12) is provided with product water ga(u)ge (13)。
6. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 5, it is characterised in that: after the every properly functioning 30min of described solid-liquid separator, with gases at high pressure air purge 30s。
7. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 6, it is characterised in that: described hydrochloric acid cleans in water tank (17) and holds the hydrochloric acid that concentration is 10%, and hydrochloric acid scavenging period is 30min。
8. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 7, it is characterised in that: described sodium hypochlorite cleans in water tank (18) and holds the sodium hypochlorite that concentration is 10%, and sodium hypochlorite scavenging period is 30min。
9. a kind of technique of zero discharge for Treatment of Metal Surface waste water according to claim 8, it is characterized in that: described dosing reaction carries out in the guide shell (1a) of muddy water tank (1), this guide shell (1a) arranges mozzle (1b), described mozzle (1b) and described guide shell (1a) tangent setting, waste water is that swirling flows into when sending into guide shell (1a) from mozzle (1b)。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2531169A1 (en) * | 2005-12-28 | 2007-06-28 | Omtec Inc. | Spent metalworking fluid treatment system |
| CN102285735A (en) * | 2011-06-10 | 2011-12-21 | 上海膜达克环保工程有限公司 | Ultrafiltration membrane treatment system and treatment process of heavy metal wastewater |
| CN103145269A (en) * | 2013-03-25 | 2013-06-12 | 上海华强环保设备工程有限公司 | Purification treatment method for oily grinding wastewater in bearing production |
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| US20110006014A1 (en) * | 2009-07-08 | 2011-01-13 | Filtertech, Inc. | System and Method For Process and Waste Water Filtration |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2531169A1 (en) * | 2005-12-28 | 2007-06-28 | Omtec Inc. | Spent metalworking fluid treatment system |
| CN102285735A (en) * | 2011-06-10 | 2011-12-21 | 上海膜达克环保工程有限公司 | Ultrafiltration membrane treatment system and treatment process of heavy metal wastewater |
| CN103145269A (en) * | 2013-03-25 | 2013-06-12 | 上海华强环保设备工程有限公司 | Purification treatment method for oily grinding wastewater in bearing production |
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