CN104118951A - Process for removing heavy metal ions in wastewater through pressurized dissolved air flotation method and device thereof - Google Patents

Process for removing heavy metal ions in wastewater through pressurized dissolved air flotation method and device thereof Download PDF

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CN104118951A
CN104118951A CN201410314014.0A CN201410314014A CN104118951A CN 104118951 A CN104118951 A CN 104118951A CN 201410314014 A CN201410314014 A CN 201410314014A CN 104118951 A CN104118951 A CN 104118951A
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water
dissolved air
sewage
waste water
flotation cell
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CN201410314014.0A
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CN104118951B (en
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龙威
凌在帅
吴张永
魏镜弢
张晓龙
莫子勇
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昆明理工大学
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Abstract

The invention discloses a process for removing heavy metal ions in wastewater through a pressurized dissolved air flotation method and a device thereof, and belongs to the field of environmental engineering governance. The process comprises the steps: firstly introducing calcium hydroxide into the wastewater, making calcium hydroxide neutralize acidic ions in the wastewater, then introducing sodium oleate to make the formed precipitate hydrophobizated, and then flocculating particles; generating micro-bubbles by the pressurized dissolved air method, discharging the saturation dissolved air water generated after pressurization to the flocculated wastewater, and carrying out flotation; and finally collecting and processing the scum obtained by flotation. The process belongs to a pressurized dissolved air flotation purifying process, is concise in process and convenient to operate, and can be continuously operated.

Description

A kind of pressure dissolved air floatation method is removed technique and the device of heavy metal ions in sewage
Technical field
The present invention relates to a kind of pressure dissolved air floatation method and remove technique and the device of heavy metal ions in sewage, belong to environmental engineering water and administer field.
Background technology
Heavy metal contaminants mainly contains mercury, cadmium, lead, copper, chromium, arsenic, nickel, iron, manganese, zinc etc., and they are irreversible processes to the pollution of physical environment substantially.With regard to the heavy metal wastewater thereby technology of administering, mainly comprise the precipitator method (hydroxide precipitation method at present, sulphide precipitation, reduction precipitation method and the flocfloatation precipitator method), Physical (activated carbon method, reverse osmosis method and ion exchange method), physico-chemical processes (absorption method, solvent extration, liquid-film method, electroosmose process, ion floatation method) electrochemical treatment technology (electrolytic process, galvanic deposit and membrane separation technique), biological process (inertia biosorption process, purebred microbial method, activated sludge process and biomembrance process).Although it is a lot of to administer the technique means of heavy metal contamination, all has certain limitation.Although precipitator method sediment metal content is high, be conducive to the recovery of metal, because some sulfide crystallization is tiny, be difficult to sedimentation, therefore application neither be very wide.In addition, the precipitator method can only be disposed the material that density ratio water is large, make it in sewage disposal, have certain limitation.In Physical, the regeneration of gac is more difficult, and renovation process, technical process etc. need further to improve, still explored to the removal mechanism of heavy metal ion about gac.In the absorption method of physico-chemical processes, sorbent material is short work-ing life, and the saturated rear regeneration difficulty of heavy metal adsorption, is difficult to reclaim heavy metal resources.At present, the domestic research to the liquid film treatment process of heavy metal-containing waste water only rests on laboratory stage, is not also applied in the processing containing heavy metal industrial effluent.In electroosmose process, concentrated concentration of heavy metal ion has certain limit, and membrane sepn efficiency fails in time needs periodic replacement, and some particulate can not be removed completely.Although electrochemical treatment technology plays the effect that reduces heavy metal in waste water content by electrolysis and deposition, all can run into the problems such as polarization of electrode, structure and corrosion in operational process.In addition, electrolytic process is processed heavy metal ion and is all had current consumption, battery lead plate consumption is large, processing cost is high problem both at home and abroad.Electrolytic process can not can not be removed the heavy metal ion in waste water completely, and the oxyhydroxide of precipitation composition unstable, certain asking in oxygenant or acidic medium, there is the possibility of dissolving again, cause secondary pollution, and, also to regularly replace the many steel of pole plate consumption.Micro-organism treatment process obtain industrial application more be biological sulfuration method, other as biological adsorption and biological solidifying wadding wait, not yet obtain large-scale industrial application.Although inertia absorption method has good dechromisation effect, this method need to be carried out pre-treatment to inertia microorganism.This makes biological adsorption agent be difficult to form series product according to people's instruction and user's demand.Meanwhile, how the organism of having adsorbed chromium the problem such as processes, and has all limited the use of the method.
For the treatment process of above-mentioned heavy metal ion-containing waste water, be applied to, in the processing of trade effluent, having received certain Social benefit and economic benefit at present.But rarer to concentration ratio, the effluent containing heavy metal ions of comparison of ingredients complexity, adopt traditional a certain method to be difficult to the treatment effect that reaches good, often adopt combination technique to process, as the treatment process of current lead-containing industrial wastewater mainly contains chemical precipitation and solvent extration, it is more difficult that chemical precipitation method reclaims lead ratio, and Solvent Extraction Separation progression is many, so cost is higher; For the reverse osmosis method that utilizes membrane separation technique to carry out and electroosmose process, they simple to operation, but owing to membranous and pre-treatment being required to restriction high and that receive concentration ratio, in the processing of trade effluent, be subject to certain restrictions.Therefore, develop efficient, energy-conservation and have the infant industry wastewater processing technology of environmental benefit and economic benefit imperative.
Publication number is that the Chinese invention patent of CN102583631A has been introduced a kind of dispose of sewage method of middle heavy metal ion of layered bi-metal that adopts.The method complicated operation, required condition is harsh, and removal heavy metal efficiency is lower.
Publication number is that the Chinese invention patent of CN102126801A has been introduced a kind of technology and equipment of processing heavy metal ion, this Processing Equipment is expensive, whole technological process is comparatively complicated, easily break down, whole technical process stability is not high, in addition, the water quality after processing, can not guarantee to reach emission request.
Under comparing; pressure dissolved air floatation method is because equipment is simple, velocity of separation is fast, selectivity is high, energy consumption is low and good to the removal effect of particle; operate the expense that saves time cheap; can eliminate heavy metal contamination under certain condition; recoverable metal again; and can also avoid the advantages such as some heavy metal hydride or carbonate filtration difficulty, particularly in China, carry out under the strategy and policy background of Sustainable development, the method has more and has wide practical use in environment protection.
Summary of the invention
The object of this invention is to provide a kind of technical process based on pressure air-dissolving method removing heavy metals ion in sewage treatment process, specifically comprise the steps:
(1) in waste water, first add calcium hydroxide to make in it and waste water in acid ion, then in waste water, pass into sodium oleate and make the throw out hydrophobization forming, finally regulate PH=8 ~ 10 of waste water, obtain pretreated waste water;
(2) pressurized air and recirculation water are made high pressure dissolved air water;
(3) ratio that is 1: 10 in the high pressure dissolved air water in step (2) and pretreated waste water volume ratio is passed into high pressure dissolved air water in step (1), to obtain carrying out in pretreated waste water coagulation, flotation, finally make the heavy metal ion in waste water deviate from flocculation particle form, and be finally removed with scum silica frost form.
Another object of the present invention is to provide described pressure dissolved air floatation method to remove heavy metal ions in sewage technique equipment therefor, this device comprises steel basin I 1, mediation groove 2, secondary mediation groove 3, floc sedimentation produces reactor 4, flotation cell 5, water-in 6, agitator 7, slag scraper 8, slag-drip opening 9, clear water output 10, reliever 11, T-shaped pipe 12, netted dividing plate 13, Porous filler 14, air compressor machine 15, sewage outlet 16, sewage import 17, steel basin II 18, steel basin I 1 is communicated with by pump and the groove 2 that is in harmonious proportion, steel basin II 18 is communicated with by pump and secondary mediation groove 3, the sewage outlet 16 of mediation groove 2 is communicated with by pump and secondary mediation groove 3, secondary is in harmonious proportion groove 3 by pump and 4 connections of floc sedimentation generation reactor, the water-in 6 that floc sedimentation produces reactor 4 and flotation cell 5 is communicated with, and flotation cell 5 the other ends are provided with clear water output 10, top is provided with slag scraper 8, slag-drip opening 9 is uncovered casings, on the wall of a side, be provided with circular discharge port, whole casing is fixed by bolts on the sidewall of flotation cell 5, the bottom of flotation cell 5 is communicated with by the lower end of reliever 11 and T-shaped pipe 12, the lower end of flotation cell 5 is communicated with by one end of pump and T-shaped pipe 12, and the other end of T-shaped pipe 12 is connected with air compressor machine 15.
The inside of steel basin I 1 of the present invention, steel basin II 18, mediation groove 2, flotation cell 5 is all provided with agitator 7.
The inside of T-shaped pipe 12 of the present invention is provided with netted dividing plate 13, Porous filler 14, and netted dividing plate 13 is positioned at the top of how empty matter filler 14, and the end section that T-shaped pipe 12 is connected with air compressor machine 15 is cellular.
Flotation cell 5 of the present invention is divided into successively by order from left to right: stirring area 19, flotation area 20, disengaging zone 21, clear water zone 22.
With water pump, sewage is sucked to mediation groove 2 by sewage import 17, then pass into the aqua calcis stirring in steel basin 1, make the acidic substance in sewage generate throw out, the sewage reacting completely is passed in secondary mediation groove 3 by sewage outlet 16, pass into sodium oleate in steel basin 1 as collecting agent simultaneously, make the throw out hydrophobization generating, again the sewage reacting completely is passed into floc sedimentation and produces reactor (FGR) 4, make throw out flocculation, finally the sewage of processing is passed in flotation cell to 5 by water-in 6; Air compressor machine 15 pressure are adjusted to 3 ~ 6 normal atmosphere, be passed into one end of T-shaped pipe 12, the entrance section of the other end is made as shown in the figure cellular, pass into recirculation water, make the liquid vapour mixture generating, by netted dividing plate 13, how empty matter filler 14, generate saturated dissolved air water e successively, finally dissolved air water e is connected with reliever 11 by the bottom of T-shaped pipe 12, passes in flotation cell 5; At stirring area a, with agitator 7, the sewage passing into is stirred, the sewage stirring enters flotation area b by stirring area a bottom and carries out flotation, unnecessary clear water flows out by the outlet 10 of clear water zone d, and slag-drip opening 9 is collected and sent into the impurity floatingly selecting at disengaging zone c with slag scraper 8.
The present invention is mainly for the treatment of containing pb 2+, Zn 2+, Cd 2+trade effluent etc. heavy metal ion.
Compared with prior art, the present invention has the following advantages:
(1) molten gas better effects if can be dissolved more gas under square one; Size and the density that generates microbubble can be controlled and regulate to reliever part;
(2) reduce the injected volume of medicament, reduced the secondary pollution that environment is caused; By realizing heavy metal after scum silica frost is further processed, reclaim simultaneously, realize resource reutilization;
(3) to process wastewater flow rate large in this technical process, and whole process realized closed-loop control, therefore can realize the recycling of dissolved air water, and reduces the demand to new water, realized to a certain extent energy-saving and emission-reduction; And the sewage degree of cleaning of processing are higher, can meet the normal Production requirement of industrial and mining enterprises;
(4) whole system globality, unity and level of automation are high, have reduced workman's labor capacity, can long-time continuous operation;
(5) the present invention is wastewater treatment in China technological improvement, improves sewage treating efficiency, realizes and saving energy and reduce the cost, and promotes the technology content of existing technique, promotes the development of sewage purification to be of great immediate significance.
Accompanying drawing explanation
Fig. 1 is workflow schematic diagram of the present invention;
Fig. 2 is the structural representation of reaction unit of the present invention;
Fig. 3 is the structural representation in the cellular cross section of T-shaped pipe.
In figure: 1-steel basin I, 2-is in harmonious proportion groove, and 3-secondary is in harmonious proportion groove, and 4-floc sedimentation produces reactor, 5-flotation cell, 6-water-in, 7-agitator, 8-slag scraper, 9-slag-drip opening, 10-clear water output, 11-reliever, 12-T type pipe, the netted dividing plate of 13-, 14-Porous filler, 15-air compressor machine, 16-sewage outlet, the import of 17-sewage, 18-steel basin II, 19-stirring area, 20-flotation area, 21-disengaging zone, 22-clear water zone, 23-dissolved air water.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but protection scope of the present invention is not limited to described content.
Embodiment 1
Described in the present embodiment, adopt pressure air-dissolving method to remove the technical process of heavy metal ions in wastewater, comprise the following steps, as shown in Figure 1:
It is to process object that the present embodiment be take from the waste water of Huize, yunnan, and this waste water mainly contains pb 2+, Zn 2+, the material such as algae pb wherein 2+, Zn 2+content be respectively 1.5mg/L, 3.2mg/L.
(1) first in the ratio of 1.5g ∕ L to pass in waste water calcium hydroxide make in it and waste water in acid ion, in the ratio of 25mg ∕ L, pass into sodium oleate again, make the throw out hydrophobization of formation, realize waste water is carried out to pre-place in advance, with calcium carbonate, regulate pH value to 8.5, the residence time 60 min.
(2) pressurized air and recirculation water are made to high pressure dissolved air water.
(3) ratio that is 1: 10 in the high pressure dissolved air water in step (2) and pretreated waste water volume ratio is passed into high pressure dissolved air water in step (1) and obtains carrying out coagulation in pretreated waste water, and coagulant administration amount is , the microbubble particle diameter and the density that by control, discharge, targetedly to containing heavy metal ion pb after pre-treatment 2+, Zn 2+waste water mix, with ferric sulfate, as flocculation agent, flocculate and flotation, heavy metal ion in waste water is deviate from flocculation particle form, and with scum silica frost form, is finally removed mix and blend rotating speed , the residence time , reaction tank mixing speed , the residence time .
Described in the present embodiment, pressure dissolved air floatation method is removed heavy metal ions in sewage technique equipment therefor, and this device comprises steel basin I 1, mediation groove 2, secondary mediation groove 3, floc sedimentation produces reactor 4, flotation cell 5, water-in 6, agitator 7, slag scraper 8, slag-drip opening 9, clear water output 10, reliever 11, T-shaped pipe 12, netted dividing plate 13, Porous filler 14, air compressor machine 15, sewage outlet 16, sewage import 17, steel basin II 18, steel basin I 1 is communicated with by pump and the groove 2 that is in harmonious proportion, steel basin II 18 is communicated with by pump and secondary mediation groove 3, the sewage outlet 16 of mediation groove 2 is communicated with by pump and secondary mediation groove 3, secondary is in harmonious proportion groove 3 by pump and 4 connections of floc sedimentation generation reactor, the water-in 6 that floc sedimentation produces reactor 4 and flotation cell 5 is communicated with, and flotation cell 5 the other ends are provided with clear water output 10, top is provided with slag scraper 8, slag-drip opening 9 is uncovered casings, on the wall of a side, be provided with circular discharge port, whole casing is fixed by bolts on the sidewall of flotation cell 5, the bottom of flotation cell 5 is communicated with by the lower end of reliever 11 and T-shaped pipe 12, the lower end of flotation cell 5 is communicated with by one end of pump and T-shaped pipe 12, and the other end of T-shaped pipe 12 is connected with air compressor machine 15.
Described in the present embodiment, the inside of steel basin I 1, steel basin II 18, mediation groove 2, flotation cell 5 is all provided with agitator 7.
Described in the present embodiment, the inside of T-shaped pipe 12 is provided with netted dividing plate 13, Porous filler 14, and netted dividing plate 13 is positioned at the top of how empty matter filler 14, and the end section that T-shaped pipe 12 is connected with air compressor machine 15 is cellular.
Described in the present embodiment, flotation cell 5 is divided into successively by order from left to right: stirring area 19, flotation area 20, disengaging zone 21, clear water zone 22.
Pressure dissolved air floatation method described in this example is removed the technique of heavy metal ions in sewage, its detailed process is: with water pump, sewage is sucked to mediation groove 2 by sewage import 17, then pass into the aqua calcis stirring in steel basin 1, make the acidic substance in sewage generate throw out, the sewage reacting completely is passed in secondary mediation groove 3 by sewage outlet 16, pass into sodium oleate in steel basin 1 as collecting agent simultaneously, make the throw out hydrophobization generating, again the sewage reacting completely is passed into floc sedimentation and produces reactor (FGR) 4, make throw out flocculation, finally the sewage of processing is passed in flotation cell to 5 by water-in 6.Air compressor machine 15 pressure are adjusted to 3 ~ 6 normal atmosphere, be passed into one end of T-shaped pipe 12, the entrance section of the other end is made as shown in the figure cellular, pass into recirculation water, make the liquid vapour mixture generating, by netted dividing plate 13, how empty matter filler 14, generate saturated dissolved air water successively, finally dissolved air water is passed in flotation cell 5 by reliever 11.At stirring area a, with agitator 7, the sewage passing into is stirred, the sewage stirring enters flotation area b by stirring area a bottom and carries out flotation, unnecessary clear water flows out by the outlet 10 of clear water zone, and slag-drip opening 9 is collected and sent into the impurity floatingly selecting at disengaging zone c with slag scraper 8.
Pb after method described in the present embodiment is processed 2+, Zn 2+content be respectively 0.05mg/L, 0.12mg/L, removal efficiency is respectively 96.7%, 96.3%.
Embodiment 2
The present embodiment be take and speeded grand waste water as processing object from Yunnan, and this waste water mainly contains Zn 2+, the material such as algae Zn wherein 2+, Cd 2+content be respectively 4.5mg/L, 2.5mg/L.
While desulfurization denitration demercuration dry method flue gas purification process flow process described in the present embodiment, comprises the following steps:
(1) first in the ratio of 40kg/t to pass in waste water calcium hydroxide make in it and waste water in acid ion, in the ratio of 120kg/t, pass into sodium oleate again, make the throw out hydrophobization of formation, realize waste water is carried out to pre-place in advance, with calcium carbonate, regulate pH value to 10, the residence time 60 min.
(2) pressurized air and recirculation water are made to high pressure dissolved air water.
(3) ratio that is 1: 10 in the high pressure dissolved air water in step (2) and pretreated waste water volume ratio is passed into high pressure dissolved air water in step (1), to obtain carrying out in pretreated waste water coagulation, coagulant administration amount is 7.8mg/L, the microbubble particle diameter and the density that by control, discharge, targetedly to after pre-treatment and contain heavy metal ion Zn 2+, Cd 2+waste water mix, with ferric sulfate, as flocculation agent, flocculate and flotation, heavy metal ion in waste water is deviate from flocculation particle form, and with scum silica frost form, is finally removed mix and blend rotating speed 120r/min, the residence time , reaction tank mixing speed 25r/min, the residence time .
Described in the present embodiment, pressure dissolved air floatation method is removed heavy metal ions in sewage technique equipment therefor, and this device comprises steel basin I 1, mediation groove 2, secondary mediation groove 3, floc sedimentation produces reactor 4, flotation cell 5, water-in 6, agitator 7, slag scraper 8, slag-drip opening 9, clear water output 10, reliever 11, T-shaped pipe 12, netted dividing plate 13, Porous filler 14, air compressor machine 15, sewage outlet 16, sewage import 17, steel basin II 18, steel basin I 1 is communicated with by pump and the groove 2 that is in harmonious proportion, steel basin II 18 is communicated with by pump and secondary mediation groove 3, the sewage outlet 16 of mediation groove 2 is communicated with by pump and secondary mediation groove 3, secondary is in harmonious proportion groove 3 by pump and 4 connections of floc sedimentation generation reactor, the water-in 6 that floc sedimentation produces reactor 4 and flotation cell 5 is communicated with, and flotation cell 5 the other ends are provided with clear water output 10, top is provided with slag scraper 8, slag-drip opening 9 is uncovered casings, on the wall of a side, be provided with circular discharge port, whole casing is fixed by bolts on the sidewall of flotation cell 5, the bottom of flotation cell 5 is communicated with by the lower end of reliever 11 and T-shaped pipe 12, the lower end of flotation cell 5 is communicated with by one end of pump and T-shaped pipe 12, and the other end of T-shaped pipe 12 is connected with air compressor machine 15.
Described in the present embodiment, the inside of T-shaped pipe 12 is provided with netted dividing plate 13, Porous filler 14, and netted dividing plate 13 is positioned at the top of how empty matter filler 14, and the end section that T-shaped pipe 12 is connected with air compressor machine 15 is cellular.
Described in the present embodiment, flotation cell 5 is divided into successively by order from left to right: stirring area 19, flotation area 20, disengaging zone 21, clear water zone 22.
Pressure dissolved air floatation method described in this example is removed the technique of heavy metal ions in sewage, its detailed process is: with water pump, sewage is sucked to mediation groove 2 by sewage import 17, then pass into the aqua calcis stirring in steel basin 1, make the acidic substance in sewage generate throw out, the sewage reacting completely is passed in secondary mediation groove 3 by sewage outlet 16, pass into sodium oleate in steel basin 1 as collecting agent simultaneously, make the throw out hydrophobization generating, again the sewage reacting completely is passed into floc sedimentation and produces reactor (FGR) 4, make throw out flocculation, finally the sewage of processing is passed in flotation cell to 5 by water-in 6.Air compressor machine 15 pressure are adjusted to 3 ~ 6 normal atmosphere, be passed into one end of T-shaped pipe 12, the entrance section of the other end is made as shown in the figure cellular, pass into recirculation water, make the liquid vapour mixture generating, by netted dividing plate 13, how empty matter filler 14, generate saturated dissolved air water successively, finally dissolved air water is passed in flotation cell 5 by reliever 11.At stirring area a, with agitator 7, the sewage passing into is stirred, the sewage stirring enters flotation area b by stirring area a bottom and carries out flotation, unnecessary clear water flows out by the outlet 10 of clear water zone, and slag-drip opening 9 is collected and sent into the impurity floatingly selecting at disengaging zone c with slag scraper 8.
Zn after method described in the present embodiment is processed 2+content be 0.15mg/L, Pb 2+content be 0.06mg/L, removal efficiency is respectively 97%, 98%.
Embodiment 3
It is to process object that the present embodiment be take from the waste water of Qujing of Yunnan, and this waste water mainly contains Pb 2+, Cd 2+, the material such as algae Pb wherein 2+, Cd 2+content be respectively 4.2mg/L, 3mg/L.
Described in the present embodiment, pressure dissolved air floatation method is removed heavy metal ions in sewage technology process flow process, comprises the following steps:
First in the ratio of 1.5g/L to pass in waste water calcium hydroxide make in it and waste water in acid ion, in the ratio of 3.5g/L, pass into sodium oleate again, make the throw out hydrophobization of formation, realize waste water is carried out to pre-place in advance, with calcium carbonate, regulate pH value to 8, the residence time 60 min.
(2) pressurized air and recirculation water are made to high pressure dissolved air water.
(3) ratio that is 1: 10 in the high pressure dissolved air water in step (2) and pretreated waste water volume ratio is passed into high pressure dissolved air water in step (1), to obtain carrying out in pretreated waste water coagulation, coagulant administration amount is 14.5mg/L, the microbubble particle diameter and the density that by control, discharge, targetedly to after pre-treatment and contain heavy metal ion Pb 2+, Cd 2+waste water mix, with ferric sulfate, as flocculation agent, flocculate and flotation, heavy metal ion in waste water is deviate from flocculation particle form, and with scum silica frost form, is finally removed mix and blend rotating speed 120r/min, the residence time , reaction tank mixing speed 25r/min, the residence time .
Described in the present embodiment, pressure dissolved air floatation method is removed heavy metal ions in sewage technique equipment therefor, and this device comprises steel basin I 1, mediation groove 2, secondary mediation groove 3, floc sedimentation produces reactor 4, flotation cell 5, water-in 6, agitator 7, slag scraper 8, slag-drip opening 9, clear water output 10, reliever 11, T-shaped pipe 12, netted dividing plate 13, Porous filler 14, air compressor machine 15, sewage outlet 16, sewage import 17, steel basin II 18, steel basin I 1 is communicated with by pump and the groove 2 that is in harmonious proportion, steel basin II 18 is communicated with by pump and secondary mediation groove 3, the sewage outlet 16 of mediation groove 2 is communicated with by pump and secondary mediation groove 3, secondary is in harmonious proportion groove 3 by pump and 4 connections of floc sedimentation generation reactor, the water-in 6 that floc sedimentation produces reactor 4 and flotation cell 5 is communicated with, and flotation cell 5 the other ends are provided with clear water output 10, top is provided with slag scraper 8, slag-drip opening 9 is uncovered casings, on the wall of a side, be provided with circular discharge port, whole casing is fixed by bolts on the sidewall of flotation cell 5, the bottom of flotation cell 5 is communicated with by the lower end of reliever 11 and T-shaped pipe 12, the lower end of flotation cell 5 is communicated with by one end of pump and T-shaped pipe 12, and the other end of T-shaped pipe 12 is connected with air compressor machine 15.
Described in the present embodiment, the inside of T-shaped pipe 12 is provided with netted dividing plate 13, Porous filler 14, and netted dividing plate 13 is positioned at the top of how empty matter filler 14, and the end section that T-shaped pipe 12 is connected with air compressor machine 15 is cellular.
Described in the present embodiment, flotation cell 5 is divided into successively by order from left to right: stirring area 19, flotation area 20, disengaging zone 21, clear water zone 22.
Pressure dissolved air floatation method described in this example is removed the technique of heavy metal ions in sewage, its detailed process is: with water pump, sewage is sucked to mediation groove 2 by sewage import 17, then pass into the aqua calcis stirring in steel basin 1, make the acidic substance in sewage generate throw out, the sewage reacting completely is passed in secondary mediation groove 3 by sewage outlet 16, pass into sodium oleate in steel basin 1 as collecting agent simultaneously, make the throw out hydrophobization generating, again the sewage reacting completely is passed into floc sedimentation and produces reactor (FGR) 4, make throw out flocculation, finally the sewage of processing is passed in flotation cell to 5 by water-in 6.Air compressor machine 15 pressure are adjusted to 3 ~ 6 normal atmosphere, be passed into one end of T-shaped pipe 12, the entrance section of the other end is made as shown in the figure cellular, pass into recirculation water, make the liquid vapour mixture generating, by netted dividing plate 13, how empty matter filler 14, generate saturated dissolved air water successively, finally dissolved air water is passed in flotation cell 5 by reliever 11.At stirring area a, with agitator 7, the sewage passing into is stirred, the sewage stirring enters flotation area b by stirring area a bottom and carries out flotation, unnecessary clear water flows out by the outlet 10 of clear water zone, and slag-drip opening 9 is collected and sent into the impurity floatingly selecting at disengaging zone c with slag scraper 8.
Pb after method described in the present embodiment is processed 2+content be 0.17mg/L, Cd 2+content be that 0.15mg/L removal efficiency is respectively 96%, 95%.

Claims (6)

1. pressure dissolved air floatation method is removed a technique for heavy metal ions in sewage, it is characterized in that: specifically comprise the steps:
(1) in waste water, add calcium hydroxide to make in it and waste water in acid ion, then in waste water, pass into sodium oleate and make the throw out hydrophobization forming, regulate PH=8 ~ 10 of waste water, obtain pretreated waste water;
(2) pressurized air and recirculation water are made high pressure dissolved air water;
(3) ratio that is 1: 10 in the high pressure dissolved air water in step (2) and pretreated waste water volume ratio is passed into high pressure dissolved air water in step (1), to obtain carrying out in pretreated waste water coagulation, flotation, finally make the heavy metal ion in waste water deviate from flocculation particle form, and be finally removed with scum silica frost form.
2. pressure dissolved air floatation method according to claim 1 is removed the technique of heavy metal ions in sewage, it is characterized in that: the concentration of described calcium hydroxide is 1.5g/L.
3. pressure dissolved air floatation method sewage purification process flow process refining plant used described in claim 1, is characterized in that this device comprises: steel basin I (1), mediation groove (2), secondary mediation groove (3), floc sedimentation produces reactor (4), flotation cell (5), water-in (6), agitator (7), slag scraper (8), slag-drip opening (9), clear water output (10), reliever (11), T-shaped pipe (12), netted dividing plate (13), Porous filler (14), air compressor machine (15), sewage outlet (16), sewage import (17), steel basin II (18), steel basin I (1) is communicated with by pump and the groove (2) that is in harmonious proportion, steel basin II (18) is communicated with by pump and secondary mediation groove (3), the sewage outlet (16) of mediation groove (2) is communicated with by pump and secondary mediation groove (3), secondary is in harmonious proportion groove (3) by pump and floc sedimentation generation reactor (4) connection, the water-in (6) that floc sedimentation produces reactor (4) and flotation cell (5) is communicated with, and flotation cell (5) the other end is provided with clear water output (10), top is provided with slag scraper (8), slag-drip opening (9) is a uncovered casing, on the wall of a side, be provided with circular discharge port, whole casing is fixed by bolts on the sidewall of flotation cell (5), the bottom of flotation cell (5) is communicated with by the lower end of reliever (11) and T-shaped pipe (12), the lower end of flotation cell (5) is communicated with by one end of pump and T-shaped pipe (12), and the other end of T-shaped pipe (12) is connected with air compressor machine (15).
4. pressure dissolved air floatation method sewage purification process flow process according to claim 3 refining plant used, is characterized in that: the inside of steel basin I (1), steel basin II (18), mediation groove (2), flotation cell (5) is all provided with agitator (7).
5. pressure dissolved air floatation method sewage purification process flow process according to claim 3 refining plant used, it is characterized in that: the inside of T-shaped pipe (12) is provided with netted dividing plate (13), Porous filler (14), netted dividing plate 13 is positioned at the top of how empty matter filler 14, and the end section that T-shaped pipe (12) is connected with air compressor machine (15) is cellular.
6. pressure dissolved air floatation method sewage purification process flow process according to claim 3 refining plant used, is characterized in that: described flotation cell (5) is divided into successively by order from left to right: stirring area (19), flotation area (20), disengaging zone (21), clear water zone (22).
CN201410314014.0A 2014-07-03 2014-07-03 A kind of pressure dissolved air floatation method removes technique and the device of heavy metal ions in sewage Active CN104118951B (en)

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