CN105152479A - Modified granular active carbon coupled membrane bioreactor (MBR) and heavy metal containing wastewater treatment method - Google Patents
Modified granular active carbon coupled membrane bioreactor (MBR) and heavy metal containing wastewater treatment method Download PDFInfo
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- CN105152479A CN105152479A CN201510575482.8A CN201510575482A CN105152479A CN 105152479 A CN105152479 A CN 105152479A CN 201510575482 A CN201510575482 A CN 201510575482A CN 105152479 A CN105152479 A CN 105152479A
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Abstract
The invention discloses a modified granular active carbon coupled membrane bioreactor (MBR) and a heavy metal containing wastewater treatment method. The modified granular active carbon coupled MBR comprises an aeration activated sludge reaction tank, a membrane component and modified granular active carbon components, wherein the aeration activated sludge reaction tank is provided with a water inlet and a water outlet; a sludge pipe is arranged at the bottom of the aeration activated sludge reaction tank; an aerator pipe connected with an aeration pump is arranged at the bottom of the aeration activated sludge reaction tank; the modified granular active carbon components comprise filter screens supported by bearing and hanging frames and modified granular active carbon filled inside the filter screens; the modified granular active carbon components are arranged in the aeration activated sludge reaction tank; the membrane component is arranged outside the aeration activated sludge reaction tank; the water outlet is connected with an inlet of the membrane component by a water pump; the membrane component is also connected with the aeration activated sludge reaction tank by a sludge return pipe. Compared with conventional MBRs, the modified granular active carbon coupled MBR can conduce to improving the wastewater treatment effects, has strong adaptability and is simple and convenient to operate.
Description
Technical field
The present invention relates to a kind of heavy metal-containing wastewater treatment device and method, specifically a kind of modified particles gac coupled film bio-reactor and heavy metal-containing wastewater treatment method.
Background technology
Near for decades, along with human social economy and the develop rapidly of modernization industry and the impact of mankind itself's social activity, a huge sum of money pollutes more and more serious, wherein serious with the heavy metal contamination in the middle of water body.Heavy metal contamination self is difficult to administer, once heavy metal contaminants water inlet surface water body and beneath water system, because heavy metal like this itself and its compound have stability and the refractory organics of height, will form great threat to environment and human lives.
If cadmium is typical heavy metal element, extensively exist in the environment.Cadmium metal is once enter human body and cause main manifestations after metal poisoning and be osteoporosis and softening, liver and kidney failure, feel that gnawing pains take no rest all day.Because the murder by poisoning of cadmium to human body causes the whole nation and even worldwide great attention; National Environment Policy Act clear stipulaties; cadmium is first kinds of pollution matter; can not replace processing targetedly with single physical method (as dilution method); and the standard that the concentration of the cadmium wastewater of plant emissions contained cadmium before unprocessed must not be formulated higher than country, cadmium wastewater has to pass through necessary process and is up to state standards through inspection and just can directly to discharge below.
At present, practical heavy metal-containing wastewater treatment method comprises hydroxide precipitation method, sulphide precipitation, ion exchange method, absorption method, oxidation reduction process, Fe forms method, membrane separation process and the biochemical precipitator method etc.At present, although water body removing heavy metals technology achieves tremendous development, also there is very large problem in theoretical and application aspect.Be on the one hand in above-mentioned each class methods based on main physically based deformation and chemical precipitation, produce a large amount of metal sludges, secondary emission is understood and be produced a very large impact environment; Although the technology on the other hand based on membrane sepn has higher development and application prospect, owing to there is the problems such as serious fouling membrane and polarization, affect widely using of isolation technique.
Therefore, how to improve the treatment effect of waste water and the removal of heavy metal brought into the treatment system of waste water, improving overall clearance is the technical bottleneck needing in heavy metal-containing wastewater treatment to solve, and has important practical significance and development prospect to the current ubiquitous heavy metal pollution of water body problem of solution.
Biologic treating technique is the wastewater processing technology widely used at present, but has certain limitation in the process of part metallic wastewater.Development along with treatment technology and the raising to water quality requirement, this combination by membrane sepn and biologic treating technique of membrane bioreactor has high effect and development and application trend to wastewater treatment.Membrane bioreactor (MBR) is the water treatment novel process of membrane sepn and microbiological treatment technical combinations, there is the advantage that many conventional water treatment processes such as processing efficiency is high, effluent quality good, technical process is short, floor space is little are incomparable, be considered to the water technology of most development prospect 21st century.At present, membrane Bio-reactor Technology is widely studied use in water treatment, membrane bioreactor can improve the effect of wastewater treatment, effluent quality is more excellent, but because heavy metal exists certain toxicity to most of biology, therefore there is no the research application report be applied to by membrane bioreactor except heavy metal-containing waste water aspect.Gac, as a kind of sorbent material, widely uses in water treatment, especially more general to the applied research of physical adsorption techniques in the removal of Heavy Metals in Waters.But due to the restriction of loading capacity, generally only adsorption is used in advanced treatment, be difficult to the adsorption technology using gac etc. in the treatment of waste water.Therefore, research and develop wastewater processing technology that a kind of effective removal heavy metal being suitable for membrane bioreactor application pollutes and device significant.
Summary of the invention
The present invention is directed to the proposition of above problem, and a kind of modified particles gac coupled film bio-reactor of research and design and method of wastewater treatment.The technique means that the present invention adopts is as follows:
A kind of modified particles gac coupled film bio-reactor, comprise aerating activated sludge reaction tank and membrane module, described aerating activated sludge reaction tank is provided with water-in and water port, bottom is provided with shore pipe, and bottom is provided with the aeration tube be connected with aeration pump, also comprise modified particles gac assembly, described modified particles gac assembly comprises by holding the modified particles gac hanging framework and hold the filter screen that hangs and be filled in its interior, described modified particles gac assembly is arranged in aerating activated sludge reaction tank, it is outside that described membrane module is arranged at aerating activated sludge reaction tank, described water port is connected with the import of membrane module by water pump, described membrane module is also connected with aerating activated sludge reaction tank by mud return line.
Further; described modified particles gac assembly is platy structure; framework is hung for holding in outside; described holding is hung framework and is made up of stainless steel; the filter screen hanging and be made up of nylon wire is held in inside; in described modified particles gac assembly, the amount of modified particles gac is 1-4g/L, and modified particles gac assembly is installed in aerating activated sludge reaction tank with the interval of below 10cm.
Further, the thickness of described modified particles gac assembly is 1-3cm.
Further, the specific surface area of described modified particles gac is between 1363.8-1548.3m
2/ g.
Further, described water-in is arranged at the bottom of aerating activated sludge reaction tank side, and water port is arranged at the opposite side of aerating activated sludge reaction tank.
A kind of modified particles gac coupled film bio-reactor heavy metal-containing wastewater treatment method, uses modified particles gac coupled film bio-reactor of the present invention, comprises the steps:
1. waste water is entered aerating activated sludge reaction tank by water-in, open aeration pump;
2. sewage enters membrane module through water port after reacting in aerating activated sludge reaction tank;
3. the sewage that aerating activated sludge reaction tank is discharged is discharged after membrane module process, and the mud in membrane module is back to aerating activated sludge reaction tank through return line.
Further, step 2. in, in described aerating activated sludge reaction tank, microorganism concn maintains 2500mg/L-3500mg/L, and pH value maintains between 6.5-8.5, and the residence time of sewage in aerating activated sludge reaction tank is 3.5-4.5 hour.
Compared with the prior art, a kind of modified particles gac coupled film bio-reactor of the present invention and method of wastewater treatment have following beneficial effect:
(1) the present invention is compared with conventional membrane bioreactor, can improve the treatment effect to heavy metal-containing waste water, strong adaptability, simple, convenient.
(2) the present invention is by modified particles charcoal absorption, bio-absorbable and the multiaction such as metabolism, biological adsorption efficient coupling one, realize the effective removal object to heavy metal in water, strong adaptability, be applicable to the improvement of heavy metal-containing waste water, removing heavy metals is effective;
(3) the present invention is by the lotus rhizome effect of modified particles gac, promotes zoogleic formation and growth, adds contact area, promotes zoogleic cohesion, improves the settling property of mud, reduces the quantity discharged of mud;
(4) the present invention is by the congregation of granulated active carbon, reduces the sludge concentration entering membrane module, reduces the pollution of film;
(5) the present invention adopts modified particles gac to be coupled in membrane bioreactor, improves adaptability and the treatment effect of waste water;
(6) the present invention can periodical operation also can operate continuously, be both applicable to the batch processed of the little water yield, be applicable to again process continuously, workable;
(7) in the present invention, modified particles gac is built into framework suspention filter screen sheet, is easy to replace regeneration;
(8) present invention process is advanced, stable, simple to operate, and equipment is easy to bookkeeping, has stronger practicality, economy.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of the present invention.
In figure: 1, aerating activated sludge reaction tank; 2, water-in; 3, water port; 4, water outlet; 5, aeration tube; 6, aeration pump; 7, membrane module; 8, modified particles activated carbon assembly; 9, water pump; 10, shore pipe; 11, mud return line; 12, active sludge; 13, hold and hang framework; 14, filter screen.
Embodiment
As shown in Figure 1, a kind of modified particles gac coupled film bio-reactor, comprise aerating activated sludge reaction tank 1 and membrane module 7, described aerating activated sludge reaction tank 1 is provided with water-in 2 and water port 3, bottom is provided with shore pipe 10, and bottom is provided with the aeration tube 5 be connected with aeration pump 6, also comprise modified particles gac assembly 8, described modified particles gac assembly 8 comprises and hangs framework 13 hold the filter screen 14 hung and the modified particles gac being filled in filter screen 14 inside by holding, described modified particles gac assembly 8 is arranged in aerating activated sludge reaction tank 1, under certain waterpower and gas shock, the modified particles gac of filter screen 14 and inside can in aerating activated sludge reaction tank 1 certain limit inner suspension, modified particles gac can change regeneration at any time.It is outside that described membrane module 7 is arranged at aerating activated sludge reaction tank 1, and described water port 3 is connected with the import of membrane module 7 by water pump 9, and described membrane module 7 is also connected with aerating activated sludge reaction tank 1 by mud return line 11.
Described modified particles gac assembly 8 is platy structure; hold and hang framework 13; described holding is hung framework 13 and is made up of stainless steel; the filter screen 14 hanging and be made up of nylon wire is held in inside; in described modified particles gac assembly 8, the amount of modified particles gac is 1-4g/L, and modified particles gac assembly is installed in aerating activated sludge reaction tank 1 with the interval of below 10cm.
The thickness of described modified particles gac assembly 8 is 1-3cm.
The specific surface area of described modified particles gac is between 1363.8-1548.3m
2/ g.
Described water-in 2 is arranged at the bottom of aerating activated sludge reaction tank 1 side, and water port 3 is arranged at aerating activated sludge reaction tank 1 opposite side.
A kind of modified particles gac coupled film bio-reactor heavy metal-containing wastewater treatment method, uses the modified particles gac coupled film bio-reactor described in the present embodiment, comprises the steps:
1. waste water is entered aerating activated sludge reaction tank 1 by water-in, open aeration pump 6;
2. sewage enters membrane module 7 through water port 3 after reacting in aerating activated sludge reaction tank 1;
3. the sewage that aerating activated sludge reaction tank 1 is discharged is discharged through water outlet 4 after membrane module 7 processes, and the mud in membrane module 7 is back to aerating activated sludge reaction tank 1 through return line.
Step 2. in, in described aerating activated sludge reaction tank 1, microorganism concn maintains 2500mg/L-3500mg/L, and pH value maintains between 6.5-8.5, and the residence time of sewage in aerating activated sludge reaction tank 1 is 3.5-4.5 hour.
In the present embodiment, granulated active carbon is first through modification, and (specific surface area is between 1363.8-1548.3m to improve its specific surface area
2/ g) and surface micropore ratio, surface can produce charcoal oxygen groups etc. simultaneously.In aerating activated sludge reaction tank, modified particles gac is on the one hand by the heavy metal in huge specific surface area and porous surface planar water, charcoal oxygen groups etc. on the other hand by Surface Creation promotes zoogleic cohesion, add the touch opportunity of active sludge and water pollutant, Accelerative mass transfer, promote that mud is to the metabolic adsorption of pollutent, change the settling property of active sludge simultaneously, and reduce the adhesion deposition of mud on film surface, realize effective process of waste water and be effectively separated heavy metal in removal water, change the settling property of mud simultaneously, reduce sludge volume.The a large amount of active sludge grown in aerating activated sludge reaction tank can absorb the heavy metal in water and participate in the metabolism of microorganism, and simultaneously the viscosity metabolite such as polyose on active sludge surface can heavy metal in planar water; Modified particles gac assembles mud, can reduce the sludge concentration entering membrane module, reduces the pollution of film, extends the work-ing life of film.
Embodiment one
Reaction target solution volume: 160L
Aerating activated sludge reaction tank activated sludge concentration: 3400mg/L;
Reaction target solution temperature: 25 DEG C;
Reaction target solution pollutent starting point concentration: COD
crfor 400mg/L, Cd
2+for 2.5mg/L;
Solution initial pH value is 8.3;
The amount 0-4g/L (wherein namely 0 represent and do not add modified particles gac, only adopts biological treatment in reactor) of modified particles gac in modified particles gac assembly;
Aerated reaction pond residence time 4h;
Operate in batches, process cadmium wastewater, when different modified particles concentration of activated carbon, the removal situation of cadmium wastewater is shown in Table 1.
Table 1: the treatment effect (initial cadmium content is 2.5mg/L, and the residence time is 4h) of modified particles gac coupled film bioreactor for treatment cadmium wastewater
| The concentration (g/L) of modified particles gac in assembly | Cd 2+(cadmium) clearance (%) | COD CrClearance (%) |
| 0 | 98.0 | 89.5 |
| 0.05 | 98.2 | 89.7 |
| 0.1 | 98.4 | 90.5 |
| 0.2 | 98.6 | 91.3 |
| 0.4 | 98.8 | 92.0 |
| 0.6 | 98.8 | 92.0 |
| 0.8 | 99.4 | 93.5 |
| 1.0 | 99.7 | 95.5 |
| 1.5 | 99.8 | 96.3 |
| 2.0 | 99.9 | 97.0 |
| 3.0 | 99.9 | 97.5 |
| 4.0 | 99.9 | 98.3 |
As can be seen from embodiment, being arranged on of modified particles gac assembly greatly enhances membrane bioreactor to cadmium and COD
crremoval effect, have pollutent simultaneously and adapt to effect preferably.In modified particles gac coupled film bioreactor for treatment cadmium wastewater; there is the adsorption of modified activated carbon; but adsorption is little; modified activated carbon is mainly through improving the settling property of mud, the concentration changing active sludge and short flocculation, increasing the effects such as mass transfer; improve the treatment effect of waste water and reduce the water ratio of mud, reducing sludge volume.
The above; be only the present invention's preferably embodiment; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to according to technical scheme of the present invention and inventive concept thereof and replace or change, all should be encompassed within protection scope of the present invention.
Claims (7)
1. a modified particles gac coupled film bio-reactor, comprise aerating activated sludge reaction tank and membrane module, described aerating activated sludge reaction tank is provided with water-in and water port, bottom is provided with shore pipe, and bottom is provided with the aeration tube be connected with aeration pump, it is characterized in that: also comprise modified particles gac assembly, described modified particles gac assembly comprises by holding the modified particles gac hanging framework and hold the filter screen that hangs and be filled in its interior, described modified particles gac assembly is arranged in aerating activated sludge reaction tank, it is outside that described membrane module is arranged at aerating activated sludge reaction tank, described water port is connected with the import of membrane module by water pump, described membrane module is also connected with aerating activated sludge reaction tank by mud return line.
2. modified particles gac coupled film bio-reactor according to claim 1; it is characterized in that: described modified particles gac assembly is platy structure; framework is hung for holding in outside; described holding is hung framework and is made up of stainless steel; the filter screen hanging and be made up of nylon wire is held in inside; in described modified particles gac assembly, the amount of modified particles gac is 1-4g/L, and modified particles gac assembly is installed in aerating activated sludge reaction tank with the interval of below 10cm.
3. modified particles gac coupled film bio-reactor according to claim 2, is characterized in that: the thickness of described modified particles gac assembly is 1-3cm.
4. modified particles gac coupled film bio-reactor according to claim 1, is characterized in that: the specific surface area of described modified particles gac is between 1363.8-1548.3m
2/ g.
5. modified particles gac coupled film bio-reactor according to claim 1, it is characterized in that: described water-in is arranged at the bottom of aerating activated sludge reaction tank side, water port is arranged at the opposite side of aerating activated sludge reaction tank.
6. a modified particles gac coupled film bio-reactor heavy metal-containing wastewater treatment method, uses as the modified particles gac coupled film bio-reactor in claims 1 to 3 as described in any one, it is characterized in that: comprise the steps:
1. waste water is entered aerating activated sludge reaction tank by water-in, open aeration pump;
2. sewage enters membrane module through water port after reacting in aerating activated sludge reaction tank;
3. the sewage that aerating activated sludge reaction tank is discharged is discharged after membrane module process, and the mud in membrane module is back to aerating activated sludge reaction tank through return line.
7. modified particles gac coupled film bio-reactor heavy metal-containing wastewater treatment method according to claim 6; it is characterized in that: step 2. in; in described aerating activated sludge reaction tank, microorganism concn maintains 2500mg/L-3500mg/L; pH value maintains between 6.5-8.5, and the residence time of sewage in aerating activated sludge reaction tank is 3.5-4.5 hour.
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| CN107055765A (en) * | 2017-05-24 | 2017-08-18 | 深圳信息职业技术学院 | The MBR processing of heavy metal compound wastewater and heavy metal recovery System and method for |
| JP7437139B2 (en) | 2019-11-19 | 2024-02-22 | 住友重機械エンバイロメント株式会社 | Water treatment equipment and water treatment method |
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