CN105130087A - Nano quantum dot adsorption and film separating system for removing heavy metal in water - Google Patents
Nano quantum dot adsorption and film separating system for removing heavy metal in water Download PDFInfo
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- CN105130087A CN105130087A CN201510627059.8A CN201510627059A CN105130087A CN 105130087 A CN105130087 A CN 105130087A CN 201510627059 A CN201510627059 A CN 201510627059A CN 105130087 A CN105130087 A CN 105130087A
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Abstract
The invention relates to a nano quantum dot adsorption and film separating system for removing heavy metal in water, which comprises a waste water storage tank (3); the waste water storage tank (3) is connected with an adsorption reaction tank (5) internally provided with a fine aeration system (6) and a stirring apparatus (7); a magnetic organic carbon carrier (8) is cast into the adsorption reaction tank (5) connected with a gas wiping cross flow film system (10) by a circulation pump (9); the gas wiping cross flow film system (10) is connected to the adsorption reaction tank (5) of which the bottom is connected with an oblique pipe deposition tank (16); the outlet of the oblique pipe deposition tank (16) is connected with a press filter (18) by a sludge pump (17) and the press filter (18) is connected to the oblique pipe deposition tank (16). The nano quantum dot adsorption and film separating system can realize continuous operation, is large in adsorption capacity, small in occupation space without the need of adding chemical agents and generation of sludge, and is small in film system cross flow rate, high in film separation precision and low in system operation energy consumption.
Description
[technical field]
The present invention relates to technical field of heavy metal wastewater treatment, specifically a kind of nano-quantum point absorption and film separating system removing heavy metal in water.
[background technology]
Heavy metal pollution of water body is a global problem.Produce normally based on the mankind, social activity and sudden water pollution accident, China accounts for global 30% by heavy metal contamination population according to statistics.In view of heavy metal, particularly Cd
2+, Cr
3+, Cr
6+, Cu
2+, Hg
2+, Pb
2+, Zn
2+, Ni
+deng, to the significant damage of HUMAN HEALTH, many countries and the World Health Organization have all formulated the standard of increasingly stringent to the content of heavy metal in waste discharge and tap water.
China is along with the increasingly stringent of environmental requirement, sewage drainage standard is also more strict, the emission standard relating to heavy waste water is more strict, and its emission standard brings up to GB21900-2008 from GB8978-1996, and traditional coagulant sedimentation can not meet new emission standard.Therefore, need to develop a kind of new heavy metal further treatment technique, make heavy metal content in the water after process meet the strictest emission standard.
In heavy metal-containing waste water, often there is complexing ion, thus cause the existence of complex state heavy metal, have impact on heavy metal and be removed by the precipitator method, current technology is a kind of is the means adopting contact break, after peeling off complexing ion, carry out the adjustment of pH value again, heavy metal precipitation is removed, but operational path is comparatively loaded down with trivial details, need accurately to control each stage pH value, require higher to automatic control.Another kind is the heavy metal absorbent that to add with ferric oxide, manganese oxide etc. be representative, but macrobead sorbent material needs preventing fixed bed adsorber, invests larger, dumb; And short grained sorbent material settling property is undesirable, solid-liquid separation effect is poor, and sorbent material can bleed pipeline sometimes, causes secondary pollution.
Membrane separation technique develops the rapidest, most widely used isolation technique over nearly 40 years.Membrane sepn is a physical process, and its ultimate principle is under the motivating forces such as concentration difference, pressure difference, potential difference, utilizes the film with selective penetrated property function the solute in feed liquid, impurity, solvent etc. to be carried out the process being separated or concentrating.Membrane separation technique is owing to having separation, concentrated, purifying and refining function concurrently, there are again efficient, energy-saving and environmental protection, molecular level filters and filtration procedure is simple, be easy to the features such as control, therefore, be widely used at present food, medicine, biology, environmental protection, chemical industry, metallurgy, the energy, oil, water treatment, electronics, the numerous areas such as bionical, become one of most important means in current separation science.
China Patent No.: 200910105943.X, publication date: 2010-09-15, discloses a kind for the treatment of process of heavy metal industrial effluent, and this patent comprises the steps: that pending waste water is injected equalizing tank by a, makes described waste water stop 6-8 hour; Step a gained supernatant liquor is injected reaction tank by b, adds medicament heavy metal ion and carries out chemical treatment; Step b gained supernatant liquor is injected pH and adjusts pond by c, and adjusted to ph is 9.0-10.0; Step c gained waste water is injected flocculation basin by d, and add polymerize aluminum chloride according to the standard of 5-10mg/L, the reaction times is 15-20 minute, carries out flocculation reaction; After micro-filtration concentration basin introduced by gained supernatant liquor, impeller pump is used to be that the waste water in pond is injected the tubular filter film that aperture is 0.05-20 micron by 3-5m/s with flow velocity, waste water is filtered, gained water outlet enters reverse osmosis membrane filtration system and carries out advanced treatment, and the dense water of gained then leads back micro-filtration concentration basin circulating filtration.
China Patent No. 201410323815.3, publication date 2014-09-24, discloses a kind of processing method of advanced treatment lower concentration complexing heavy metal waste water, comprises following content: first complexing heavy metal waste water is adjusted to weakly alkaline; Then logical ozone O
3micropore (10-20 μm) aerating oxidation 90min-120min, O
3react with OH-the OH generated and have very strong oxidation capacity, ozone and the common oxidation complexation ligand of hydroxyl radical free radical carry out contact break; Then the FeSO of 400mg/L is added
4pH is transferred between 10.5-14, carries out reduction agglutination reaction, make metal hydroxides aggegation form particle; With the back-washable sludge proof PVDF material TMF membrane filtration of aperture <0.1 micron after reaction; The press filtration of last membrane filtration condensation product pressure filter, mud does solid waste process, and pressing filtering liquid is mixed in weakly alkaline water.
Treatment process described in above patent is all comparatively complicated, and hydraulic detention time is long, all needs to add chemical agent and carries out pH value adjustment, and need multiple reaction tank to react, and floor space is large, and facility investment is large.Meanwhile, owing to having added polymerize aluminum chloride, can produce a large amount of mud, additionally increase sludge disposal pressure, and the flow velocity of tubular membrane system is up to 5m/s, the operating pressure of reverse osmosis membrane is more than 1.5MPa, and system cloud gray model energy consumption is higher, is unfavorable for large-scale promotion.
[summary of the invention]
Object of the present invention is exactly will solve above-mentioned deficiency and provide a kind of nano-quantum point absorption and the film separating system of removing heavy metal in water, continuous operation can be realized, loading capacity is large, system footprint is little, without the need to adding chemical agent, produce without mud, membranous system cross-flow rate is little, membrane sepn precision is high, system cloud gray model low power consumption and other advantages, the loading capacity overcoming existing traditional heavy metal absorbent is little, adsorptive power is poor, the defect that is not easily separated with waste water after adsorption precipitation.
Design a kind of nano-quantum point absorption and the film separating system of removing heavy metal in water for achieving the above object, comprise waste water storage tank 3, absorption reaction groove 5, gas wipes formula cross-flow membrane system 10 and tube settling groove 16, submersible sewage pump 4 is provided with in described waste water storage tank 3, described submersible sewage pump 4 connects absorption reaction groove 5 by pipeline, meticulous aerating system 6 and whipping appts 7 is provided with in described absorption reaction groove 5, the charcoal carrier 8 that is magnetic is added in described absorption reaction groove 5, on described magnetic bio high-area carbon 8, load has Nano type sorbent material, described absorption reaction groove 5 is provided with waste water mixture export, described waste water mixture export connects gas by recycle pump 9 and wipes formula cross-flow membrane system 10, described gas is wiped formula cross-flow membrane system 10 and is provided with membranous system concentrated solution outlet and qualified discharge water out, described membranous system concentrated solution outlet is connected to absorption reaction groove 5 by pipeline, the bottom of described absorption reaction groove 5 is provided with the outlet of sorbent material mixing sludge, described sorbent material mixing sludge outlet connects tube settling groove 16 by pipeline, the outlet of described tube settling groove 16 connects sludge pump 17 by pipeline, the other end of described sludge pump 17 connects pressure filter 18 by pipeline, the filter press filtrate 19 of described pressure filter 18 is back to tube settling groove 16 by pipeline, the solid product of described pressure filter 18 forms the sorbent material 20 being rich in heavy metal.
Also comprise gas blower 21, described gas blower 21 connects meticulous aerating system 6 and meticulous air bump rinse operation system 11 respectively by pipeline.
On described magnetic bio high-area carbon 8, load has Nano type quantum dot sorbent material.
The ingress that described gas wipes formula cross-flow membrane system 10 is provided with meticulous air bump rinse operation system 11, and described gas is wiped formula cross-flow membrane system 10 top and is provided with electromagnetic field one 12a.
The bottom of described tube settling groove 16 is provided with electromagnetic field two 12b.
The membrane module that described gas wipes formula cross-flow membrane system 10 adopts tubular membrane, and the membrane material of described tubular membrane is organic material, and described organic material comprises PVDF, PVC, PTFE, PE, PP.
The membrane module that described gas wipes formula cross-flow membrane system 10 adopts tubular membrane, and the membrane material of described tubular membrane is inorganic, and described inorganic comprises pottery, stainless steel.
The membrane sepn aperture that described gas wipes formula cross-flow membrane system 10 is 0.01-2 μm.
The inner cross-flow flow velocity of film that described gas wipes formula cross-flow membrane system 10 is 0.5-2m/s.
Described Nano type quantum dot sorbent material is sulfenyl, aluminium base quantum dot sorbent material.
Compared with the existing technology, tool has the following advantages in the present invention:
(1) without the need to adding chemical agent, avoiding secondary pollution;
(2) hydraulic detention time is short, technical process is short, system footprint area is little;
(3) do not add flocculation agent etc., produce without chemical sludge;
(4) adopt membrane technique to carry out solid-liquid separation to sorbent material, separation accuracy is high, and product water water quality is good;
(5) membrane module import is provided with meticulous air bump rinse operation, significantly slows down the pollution of film;
(6) membranous system is provided with electromagnetic field, improves the separating effect of magnetic carrier;
(7) adopt low flow velocity tubular membrane, operation energy consumption is low;
(8) produce water water quality and meet the most strict emission standards of country, and sorbent material can reclaim;
To sum up: the loading capacity that instant invention overcomes existing traditional heavy metal absorbent is little, adsorptive power is poor, the defect that is not easily separated with waste water after adsorption precipitation, continuous operation can be realized, loading capacity is large, system footprint is little, without the need to adding chemical agent, produce without mud, membranous system cross-flow rate is little, membrane sepn precision is high, system cloud gray model low power consumption and other advantages.
[accompanying drawing explanation]
Fig. 1 is structural representation of the present invention;
In figure: 1, production plant 2, heavy metal wastewater thereby 3, waste water storage tank 4, submersible sewage pump 5, absorption reaction groove 6, meticulous aerating system 7, whipping appts 8, magnetic bio high-area carbon 9, recycle pump 10, gas wipes formula cross-flow membrane system 11, meticulous air bump rinse operation system 12a, electromagnetic field one 12b, electromagnetic field 2 13, membranous system concentrated solution 14, qualified discharge water 15, reacted sorbent material mixing sludge 16, tube settling groove 17, sludge pump 18, pressure filter 19, filter press filtrate 20, be rich in the sorbent material 21 of heavy metal, gas blower.
[embodiment]
As shown in Figure 1, the present invention includes: waste water storage tank 3, absorption reaction groove 5, gas wipes formula cross-flow membrane system 10 and tube settling groove 16, submersible sewage pump 4 is provided with in waste water storage tank 3, submersible sewage pump 4 connects absorption reaction groove 5 by pipeline, meticulous aerating system 6 and whipping appts 7 is provided with in absorption reaction groove 5, the charcoal carrier 8 that is magnetic is added in absorption reaction groove 5, on magnetic bio high-area carbon 8, load has Nano type sorbent material, absorption reaction groove 5 is provided with waste water mixture export, waste water mixture export connects gas by recycle pump 9 and wipes formula cross-flow membrane system 10, gas is wiped formula cross-flow membrane system 10 and is provided with membranous system concentrated solution outlet and qualified discharge water out, membranous system concentrated solution outlet is connected to absorption reaction groove 5 by pipeline, the bottom of absorption reaction groove 5 is provided with the outlet of sorbent material mixing sludge, the outlet of sorbent material mixing sludge connects tube settling groove 16 by pipeline, the outlet of tube settling groove 16 connects sludge pump 17 by pipeline, the other end of sludge pump 17 connects pressure filter 18 by pipeline, the filter press filtrate 19 of pressure filter 18 is back to tube settling groove 16 by pipeline, the solid product of pressure filter 18 forms the sorbent material 20 being rich in heavy metal.Also comprise gas blower 21, gas blower 21 connects meticulous aerating system 6 and meticulous air bump rinse operation system 11 respectively by pipeline.
Wherein, on magnetic bio high-area carbon 8, load has Nano type quantum dot sorbent material, and this Nano type quantum dot sorbent material is sulfenyl, aluminium base quantum dot sorbent material.The ingress that gas wipes formula cross-flow membrane system 10 is provided with meticulous air bump rinse operation system 11, and gas is wiped formula cross-flow membrane system 10 top and is provided with electromagnetic field one 12a, and the bottom of tube settling groove 16 is provided with electromagnetic field two 12b.The membrane module that gas wipes formula cross-flow membrane system 10 can adopt tubular membrane, and the membrane material of tubular membrane is organic material, and organic material comprises PVDF, PVC, PTFE, PE, PP; The membrane module that this gas wipes formula cross-flow membrane system 10 also can adopt tubular membrane, and the membrane material of tubular membrane is inorganic, and inorganic comprises pottery, stainless steel.The membrane sepn aperture that gas wipes formula cross-flow membrane system 10 is 0.01-2 μm, and the inner cross-flow flow velocity of film that gas wipes formula cross-flow membrane system 10 is 0.5-2m/s.
The invention belongs to heavy metal advanced treatment field, in particular to a kind of Nano type quantum dot heavy metal adsorption and membrane filtration system, by Nano type quantum dot is carried on magnetic bio high-area carbon, the Nano type sorbent material that preparation loading capacity is large, the membrane separation technique of combined high precision, and coordinate electromagnetic field and meticulous air bump rinse operation system, the sorbent material after Adsorption of Heavy Metals and waste water are carried out high efficient solid and liquid separation, obtains the high-quality reaching discharging standards and produce water.
In the present invention, the Nano type material adopting loading capacity huge is as sorbent material; As preferably, the heavy metal absorbent that the present invention adopts is Nano type quantum dot, preferred sulfenyl, aluminium base quantum dot.Nano type quantum dot is carried on magnetic bio high-area carbon, had both added the active adsorption space of sorbent material, be conducive to again the solid-liquid separation after adsorbing.Its absorption reaction is rapid, and required hydraulic detention time is only 5-30min, and does not need during absorption reaction to add chemical agent, can avoid secondary chemical pollution, and can not produce chemical sludge.
The present invention adopts membrane separation technique to carry out solid-liquid separation to sorbent material, and separation accuracy is high, produces water water quality excellence.Its membrane module adopts tubular membrane, and membrane material can be organic material, such as PVDF, PVC, PTFE, PE, PP etc., also can be inorganic, such as pottery, stainless steel etc.; As preferably, patent of the present invention adopts ceramic pipe type film to carry out solid-liquid separation.Its membrane sepn aperture at 0.01-2 μm, preferably 0.2 μm.Membrane module ingress is provided with meticulous air bump rinse operation system, and mixed solution enters membrane module inside together with meticulous air, and is back to front reaction groove together with membranous system concentrated solution, and under the effect of air bump rinse operation, membrane module inside not easily blocks, and running maintenance is convenient.Membranous system top arranges electromagnetic field one, and magnetic carrier is subject to the effect of electromagnetic field one in membrane module inside, is not easily deposited on film surface, not easily pollutes film, is conducive to membranous system long-term stability and runs.Under the dual function of meticulous air bump rinse operation and electromagnetic field one, the inner cross-flow flow velocity of less membrane module, operation energy consumption can be adopted lower; As preferably, the inner cross-flow flow velocity of the film that this patent adopts is only 0.5-2m/s.Magnetic carrier after membranous system concentrates adopts tube settling groove to carry out further solid-liquid separation, and tube settling trench bottom is provided with electromagnetic field two, and can accelerate the precipitation of magnetic bio high-area carbon in settling bath inside, solid-liquid separation effect is obvious.Integrated artistic flow process is short, without the need to adding chemical agent, taking up an area little, continuous operation.
As shown in Figure 1, the heavy metal wastewater thereby 2 that production plant 1 produces is in the waste water storage tank 3 flowing into underground type, heavy metal wastewater thereby 2 carries out the water yield in waste water storage tank 3, the buffering of water quality with regulate after, absorption reaction groove 5 is entered under the suction function of submersible sewage pump 4, meticulous aerating system 6 and whipping appts 7 is provided with in absorption reaction groove 5, the magnetic bio high-area carbon 8 of load Nano type quantum dot sorbent material is added in absorption reaction groove 5, absorption reaction is carried out with heavy metal wastewater thereby 2, heavy metal in waste water is adsorbed on the magnetic bio high-area carbon 8 of load Nano type quantum dot sorbent material, under the dual function of meticulous aerating system 6 and whipping appts 7, absorption reaction is carried out rapidly, improve adsorption efficiency.Waste water mixed solution after absorption reaction completes enters gas and wipes formula cross-flow membrane system 10 under the effect of recycle pump 9, the ingress that gas wipes formula cross-flow membrane system 10 is provided with meticulous air bump rinse operation system 11, top is provided with electromagnetic field one 12a, the magnetic bio high-area carbon 8 of load Nano type quantum dot sorbent material is wiped formula cross-flow membrane system 10 inside at gas and is carried out high efficient solid and liquid separation, and being back in absorption reaction groove 5 with membranous system concentrated solution 13, the permeate that gas wipes formula cross-flow membrane system 10 becomes qualified discharge water 14.Reacted sorbent material mixing sludge 15 in absorption reaction groove 5 enters tube settling groove 16, electromagnetic field two 12b is provided with bottom tube settling groove 16, improve solid-liquid separation effect, under the effect of sludge pump 17, reacted sorbent material mixing sludge 15 enters pressure filter 18 and carries out degree of depth press filtration, filter press filtrate 19 returns tube settling groove 16, and the solid product of pressure filter 18 forms the sorbent material 20 being rich in heavy metal, can be further used as resource and be extracted, reclaims.The air that gas blower 21 provides sufficient for giving meticulous aerating system 6 and meticulous air bump rinse operation system 11.
Below in conjunction with specific embodiment, following further illustrating is done to the present invention:
Embodiment 1
Take from the heavy metal-containing waste water of Shanghai Electroplate Factory, Cr
3+, Cu
2+, Ni
+concentration be respectively 0.84ppm, 211ppm, 3.1ppm, through absorption reaction 10min, meticulous aeration air quantity is 50L/min/m
2pond floorage, mixing speed is 100rpm, and mixed solution enters membranous system and is separated, and membrane filtration system adopts and is separated the tubular ultra-filtration membrane that aperture is 0.05 μm, and membrane material is PVDF, and velocity in pipes is 1.5m/s, and meticulous air bump rinse operation amount is 2L/min/m
2membrane area, produces the Cr in water
3+, Cu
2+, Ni
+concentration be respectively 0.0184ppm, 0.0464ppm, 0.0367ppm.
Embodiment 2
Take from the heavy metal-containing waste water of Anhui metal finishing company, Zn
2+, Mn
2+, Ni
+concentration is respectively 68.6ppm, 54.3ppm, 53.9ppm, and through absorption reaction 30min, meticulous aeration air quantity is 100L/min/m
2pond floorage, mixing speed is 50rpm, and mixed solution enters membranous system and is separated, and membrane filtration system adopts and is separated the tube type filter membrance that aperture is 0.1 μm, and membrane material is pottery, and velocity in pipes is 2m/s, and meticulous air bump rinse operation amount is 1L/min/m
2membrane area, produces the Zn in water
2+, Mn
2+, Ni
+concentration is respectively 0.0052ppm, 0.00312ppm, 0.0153ppm.
Embodiment 3
Take from the heavy metal-containing waste water of Henan Jin Qian limited-liability company, As
3+, Pb
2+, Cd
2+concentration is respectively 130.01ppm, 15.25ppm, 35.13ppm, and through absorption reaction 30min, meticulous aeration air quantity is 200L/min/m
2pond floorage, mixing speed is 0rpm, and mixed solution enters membranous system and is separated, and membrane filtration system adopts and is separated the tube type filter membrance that aperture is 0.2 μm, and membrane material is PTFE, and velocity in pipes is 2m/s, and meticulous air bump rinse operation amount is 1L/min/m
2membrane area, produces the As in water
3+, Pb
2+, Cd
2+concentration is respectively 0.028ppm, 0.056ppm, 0.004ppm.
The present invention, by the restriction of above-mentioned embodiment, change, the modification done, substitutes, combines, simplifies under other any does not deviate from spirit of the present invention and principle, all should be equivalent substitute mode, is included within protection scope of the present invention.
Claims (10)
1. remove nano-quantum point absorption and the film separating system of heavy metal in water for one kind, comprise waste water storage tank (3), absorption reaction groove (5), gas wipes formula cross-flow membrane system (10) and tube settling groove (16), it is characterized in that: in described waste water storage tank (3), be provided with submersible sewage pump (4), described submersible sewage pump (4) connects absorption reaction groove (5) by pipeline, meticulous aerating system (6) and whipping appts (7) is provided with in described absorption reaction groove (5), the charcoal carrier (8) that is magnetic is added in described absorption reaction groove (5), the upper load of described magnetic bio high-area carbon (8) has Nano type sorbent material, described absorption reaction groove (5) is provided with waste water mixture export, described waste water mixture export connects gas by recycle pump (9) and wipes formula cross-flow membrane system (10), described gas is wiped formula cross-flow membrane system (10) and is provided with membranous system concentrated solution outlet and qualified discharge water out, described membranous system concentrated solution outlet is connected to absorption reaction groove (5) by pipeline, the bottom of described absorption reaction groove (5) is provided with the outlet of sorbent material mixing sludge, described sorbent material mixing sludge outlet connects tube settling groove (16) by pipeline, the outlet of described tube settling groove (16) connects sludge pump (17) by pipeline, the other end of described sludge pump (17) connects pressure filter (18) by pipeline, the filter press filtrate (19) of described pressure filter (18) is back to tube settling groove (16) by pipeline, the solid product of described pressure filter (18) forms the sorbent material (20) being rich in heavy metal.
2. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 1, it is characterized in that: also comprise gas blower (21), described gas blower (21) connects meticulous aerating system (6) and meticulous air bump rinse operation system (11) respectively by pipeline.
3. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 2, is characterized in that: the upper load of described magnetic bio high-area carbon (8) has Nano type quantum dot sorbent material.
4. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 3, it is characterized in that: the ingress that described gas wipes formula cross-flow membrane system (10) is provided with meticulous air bump rinse operation system (11), described gas is wiped formula cross-flow membrane system (10) top and is provided with electromagnetic field one (12a).
5. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 4, is characterized in that: the bottom of described tube settling groove (16) is provided with electromagnetic field two (12b).
6. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 5, it is characterized in that: the membrane module that described gas wipes formula cross-flow membrane system (10) adopts tubular membrane, the membrane material of described tubular membrane is organic material, and described organic material comprises PVDF, PVC, PTFE, PE, PP.
7. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 5, it is characterized in that: the membrane module that described gas wipes formula cross-flow membrane system (10) adopts tubular membrane, the membrane material of described tubular membrane is inorganic, and described inorganic comprises pottery, stainless steel.
8. the nano-quantum point absorption of heavy metal and film separating system in removal water as claimed in claims 6 or 7, is characterized in that: the membrane sepn aperture that described gas wipes formula cross-flow membrane system (10) is 0.01-2 μm.
9. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 8, is characterized in that: the inner cross-flow flow velocity of film that described gas wipes formula cross-flow membrane system (10) is 0.5-2m/s.
10. nano-quantum point absorption and the film separating system removing heavy metal in water as claimed in claim 9, is characterized in that: described Nano type quantum dot sorbent material is sulfenyl, aluminium base quantum dot sorbent material.
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