CN104891649A - Biochemical pool - Google Patents
Biochemical pool Download PDFInfo
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- CN104891649A CN104891649A CN201510400709.5A CN201510400709A CN104891649A CN 104891649 A CN104891649 A CN 104891649A CN 201510400709 A CN201510400709 A CN 201510400709A CN 104891649 A CN104891649 A CN 104891649A
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- biochemical treatment
- aeration
- biochemistry pool
- treatment tank
- water
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
The invention relates to the technical field of sewage treatment equipment, in particular to a biochemical pool. The biochemical pool comprises a biochemical treatment pool and a secondary sedimentation pool, wherein a water inlet and an air inlet are formed in the biochemical treatment pool; an aeration corrugated pipe is arranged at the bottom of the biochemical treatment pool; aeration holes are distributed in the aeration corrugated pipe; the air inlet is communicated with the aeration corrugated pipe through an air inlet pipeline; the biochemical treatment pool is provided with a water inlet pipeline; one end of the water inlet pipeline is connected with the water inlet, and the other end of the water inlet pipeline extends to the bottom of the biochemical treatment pool; a water outlet is also formed in the biochemical treatment pool; a water outlet pipeline is connected to the water outlet and extends into the secondary sedimentation pool; a sludge discharging opening is formed in the bottom of the secondary sedimentation pool; a water drainage outlet is formed in the upper part of the secondary sedimentation pool. By supplying air, active sludge at the bottom of the biochemical treatment pool rolls over, and impurity constituents in sewage are better treated by the active sludge; in addition, the active sludge carried in drained water is discharged through the discharging opening in the bottom of the secondary sedimentation pool, so that cyclic utilization is achieved.
Description
Technical field
The present invention relates to technical field of sewage treatment equipment, especially relate to a kind of biochemistry pool.
Background technology
Ternary composite driving technology is by alkali-tensio-active agent-polymkeric substance by injecting stratum after the mixing of certain ratio, the viscosity of raising displacing fluid, increase sweep efficiency, and then improves recovery ratio.But because ternary composite flooding water extraction viscosity is high, oil bead diameter is little, complicated component, its intractability drives and water drive recovered water higher than poly-." secondary sedimentation+cascade filtration " treatment process that current oil field generally adopts can not meet effluent index and reach two 20 (oleaginousness≤20mg/L, suspended substance≤20mg/L).It is the tertiary process technology of representative that China's major part oil field has entered all with ternary composite driving, ternary composite flooding water extraction water ratio about 90%, and the water separated is used for re-injection greatly, and reinjected water process is defective can block stratum, reduces petroleum production.So water treatment has become the bottleneck of oil field middle and later periods development, it is the important topic being badly in need of solving.
Existing biochemical processing is when processing produced fluids during asp-flooding, and simple activated sludge process, sludge yield is high, causes the surplus sludge volume of discharge excessive, increases processing cost and increases secondary pollution probability simultaneously.In view of this, special proposition the present invention.
Summary of the invention
The object of the present invention is to provide a kind of biochemistry pool, many with the active sludge solving the biochemistry pool loss existed in prior art, add the technical problem of cost.
A kind of biochemistry pool, comprises biochemical treatment tank and second pond;
Described biochemical treatment tank is provided with water-in and inlet mouth, the bottom of described biochemical treatment tank is provided with aeration corrugated tube, and described aeration corrugated tube distributes solarization air cap, and described inlet mouth is communicated with described aeration corrugated tube by intake ducting;
Described biochemical treatment tank is provided with inlet channel, and one end of described inlet channel connects described water-in, and the other end of described inlet channel stretches into the bottom of described biochemical treatment tank;
Described biochemical treatment tank is also provided with water outlet, described water outlet connects outlet conduit, described outlet conduit stretches in described second pond;
The bottom of described second pond is provided with sludge outlet, and top is provided with water port.
Biochemistry pool provided by the invention, the bottom of biochemical treatment tank is provided with aeration corrugated tube, and aeration corrugated tube distributes solarization air cap, by the supply of gas, active sludge bottom biochemical treatment tank is rolled, and like this, the impurity component in sewage is better fallen by active sludge treatment; In addition, the water that biochemical treatment tank is discharged, by arranging independent second pond, passes into wherein by the present invention, discharge the active sludge carried in water is deposited on second pond bottom by natural subsidence, by the relief outlet bottom second pond, active sludge is discharged, thus achieves recycle.
In order to prevent the water in outlet conduit, the active sludge be deposited in second pond is confused, be not easy to the recovery of active sludge, preferably, described second pond is provided with flow tube, the number of described outlet conduit is more than 1, the outlet of described outlet conduit is all arranged in described second pond flow tube, and the below of described flow tube is provided with flow-stopping plate.Current are collected in the effect of flow tube, avoid water splashes.Under the guiding of second pond flow tube, current become columnar flow through flow-stopping plate, flow-stopping plate dispersing water flow, make its flowing of slowing down to both sides, avoid resuspended for second pond base sludge.
For the ease of active sludge sedimentation in second pond, be easy to reclaim, preferably, the bottom of described second pond is tapered.
Preferably, described biochemistry pool also comprises mud return line, and the bottom of described second pond is stretched in one end of described mud return line, and the other end stretches in described biochemical treatment tank;
The position of described mud return line corner is connected with tracheae.
Gas passes into mud return line by tracheae, and the active sludge bottom second pond, by syphonic effect, transports in biochemical treatment tank, realizes the automatic recovery of active sludge by mud return line, convenient and swift.
Preferably, described solarization air cap gathers on described aeration corrugated tube, and the bottom of described biochemical treatment tank is provided with multiple aeration corrugated tube, and the bottom of described aeration corrugated tube is communicated by described intake ducting.Like this, gas enters inlet mouth, then intake ducting is entered, gas is passed into aeration corrugated tube by the intake ducting be positioned at bottom aeration corrugated tube by gas, and gas from bottom to top, is not only supplied to the more oxygen of active sludge, active sludge is also made to be in suspension tumbling state, make Activated Sludge Growth better, and increase the contact area of active sludge and sewage, increase the treatment effect of active sludge.
Preferably, biofilm development upholder is provided with between described aeration corrugated tube.Aeration corrugated tube gives sufficient gas, and active sludge adheres on biofilm development upholder, and growth reproduction, form microbial film, utilize microbial film to adsorb dirty Organic substance in water, degrade, sewage better purifies.Wherein, in order to homogeneous arrangement biofilm development upholder, and increase treatment effect, biofilm development upholder is arranged between aeration corrugated tube file, and biofilm development upholder is fixed by steel pipe with cascade.Like this, current are entered by water-in, through the biofilm development upholder file, flow out to water outlet, increase the treatment effect of sewage.
Preferably, described biofilm development upholder is the plastic sheet of two sides with fiber.The two sides of plastic sheet with fiber, to increase the surface-area of biofilm development upholder.
In order to better form microbial film, utilizing microbial film to adsorb dirty Organic substance in water, degrade, making sewage disposal reach better decontamination effect improving, preferably, the diameter of described plastic sheet is 5-8cm, and the length of described fiber is 8-15cm.
Further, described biochemical treatment tank adopts stainless steel plate to be welded.With the pond body of stainless steel plate welding biochemical treatment tank, durable, be beneficial to the process of sewage.
Biochemistry pool provided by the invention can be used alone, use of also can connecting.As when sewage quality worsens, namely in sewage, oleaginousness is greater than 10000mg/l, when suspension content is more than 500mg/l, two biochemistry pool series connection can be used, be easy to next step process to make the sewage after process.Further, two described biochemistry pool series connection.
Accompanying drawing explanation
In order to be illustrated more clearly in the specific embodiment of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The side sectional view of the biochemistry pool that Fig. 1 provides for the embodiment of the present invention;
The vertical view of the biochemistry pool that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of two biochemistry pool series connection that Fig. 3 provides for the embodiment of the present invention;
Reference numeral:
1-biochemical treatment tank; 2-second pond; 3-aeration corrugated tube;
4-inlet channel; 5-outlet conduit; 6-flow tube;
7-flow-stopping plate; 8-sludge outlet; 9-mud return line;
10-intake ducting; 11-tracheae; 12-biofilm development upholder.
Embodiment
Be clearly and completely described technical scheme of the present invention below in conjunction with accompanying drawing, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
In describing the invention, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In describing the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, particular case above-mentioned term concrete meaning in the present invention can be understood.
The side sectional view of the biochemistry pool that Fig. 1 provides for the embodiment of the present invention; Fig. 2 is the vertical view of the biochemistry pool shown in Fig. 1.As depicted in figs. 1 and 2, the biochemistry pool that the present embodiment provides, comprises biochemical treatment tank 1 and second pond 2;
Described biochemical treatment tank 1 is provided with water-in and inlet mouth, and the bottom of described biochemical treatment tank 1 is provided with aeration corrugated tube 3, and described aeration corrugated tube 3 distributes solarization air cap, and described inlet mouth is communicated with described aeration corrugated tube 3 by intake ducting 10;
Described biochemical treatment tank 1 is provided with inlet channel 4, and one end of described inlet channel 4 connects described water-in, and the other end of described inlet channel 4 stretches into the bottom of described biochemical treatment tank 1;
Described biochemical treatment tank 1 is also provided with water outlet, described water outlet connects outlet conduit 5, described outlet conduit 5 stretches in described second pond 2;
The bottom of described second pond 2 is provided with sludge outlet 8, and top is provided with water port.
Biochemistry pool provided by the invention, the bottom of biochemical treatment tank 1 is provided with aeration corrugated tube 3, aeration corrugated tube 3 distributes solarization air cap, gas supplies aeration corrugated tube 3 by intake ducting 10, gas makes the active sludge bottom biochemical treatment tank roll by the solarization air cap above aeration corrugated tube 3, like this, the impurity component in sewage is better fallen by active sludge treatment; In addition, the present invention is by arranging independent second pond 2, the water that biochemical treatment tank 1 is discharged passes in second pond 2, discharge the active sludge carried in water is deposited on second pond 2 bottom by natural subsidence, by the sludge outlet 8 bottom second pond 2, active sludge is discharged, thus achieves the recycle of active sludge.
In order to prevent the water in outlet conduit 5, the active sludge be deposited in second pond 2 is confused, be not easy to the recovery of active sludge, preferably, described second pond 2 is provided with flow tube 6, the number of described outlet conduit 5 is more than 1, the outlet of described outlet conduit 5 is all arranged in described second pond flow tube 6, and the below of described flow tube 6 is provided with flow-stopping plate 7.Current are collected in the effect of flow tube 6, avoid water splashes.Under the guiding of second pond flow tube 6, current become columnar flow through flow-stopping plate 7, flow-stopping plate 7 dispersing water flow, make its flowing of slowing down to both sides, avoid resuspended for second pond base sludge.
For the ease of active sludge sedimentation in second pond 2, be easy to reclaim, preferably, the bottom of described second pond 2 is tapered.
Preferably, described biochemistry pool also comprises mud return line 9, and the bottom of described second pond 2 is stretched in one end of described mud return line 9, and the other end stretches in described biochemical treatment tank 1;
The position of described mud return line 9 corner is connected with tracheae 11.
Gas passes into mud return line 9 by tracheae 11, and the active sludge bottom second pond 2, by syphonic effect, transports in biochemical treatment tank 1, realizes the automatic recovery of active sludge by mud return line 9, convenient and swift.
Preferably, described solarization air cap gathers on described aeration corrugated tube 3, and the bottom of described biochemical treatment tank 1 is provided with multiple aeration corrugated tube 3, and the bottom of described aeration corrugated tube 3 is communicated by described intake ducting.Like this, gas enters inlet mouth, then intake ducting 10 is entered, gas is passed into aeration corrugated tube 3 by the intake ducting 10 be positioned at bottom aeration corrugated tube 3 by gas, and gas from bottom to top, is not only supplied to the more oxygen of active sludge, active sludge is also made to be in suspension tumbling state, make Activated Sludge Growth better, and increase the contact area of active sludge and sewage, increase the treatment effect of active sludge.
In order to make the effect of sewage disposal more homogeneous, all equidistant arrangement of aeration corrugated tube 3, as being arranged to the mode of multiple lines and multiple rows.
Preferably, biofilm development upholder is provided with between described aeration corrugated tube 3.Aeration corrugated tube 3 gives sufficient gas, and active sludge adheres on biofilm development upholder 12, and growth reproduction, form microbial film, utilize microbial film to adsorb dirty Organic substance in water, degrade, sewage better purifies.Wherein, in order to homogeneous arrangement biofilm development upholder 12, and increase treatment effect, biofilm development upholder 12 is arranged between aeration corrugated tube 3 file, and biofilm development upholder 12 is fixed by steel pipe with cascade.Like this, current are entered by water-in, through the biofilm development upholder 12 file, flow out to water outlet, increase the treatment effect of sewage.
Preferably, described biofilm development upholder 12 is the plastic sheet of two sides with fiber.The two sides of plastic sheet with fiber, to increase the surface-area of biofilm development upholder 12.
In order to better form microbial film, utilizing microbial film to adsorb dirty Organic substance in water, degrade, making sewage disposal reach better decontamination effect improving, preferably, the diameter of described plastic sheet is 5-8cm, and the length of described fiber is 8-15cm.
Further, described biochemical treatment tank adopts stainless steel plate to be welded.With the pond body of stainless steel plate welding biochemical treatment tank, durable, be beneficial to the process of sewage.
Biochemistry pool provided by the invention can be used alone, use (as shown in Figure 3) of also can connecting.As when sewage quality worsens, namely in sewage, oleaginousness is greater than 10000mg/l, when suspension content is more than 500mg/l, two biochemistry pool series connection can be used, be easy to next step process to make the sewage after process.Further, two described biochemistry pool series connection.
Particularly, biochemistry pool provided by the invention can be set to:
The biochemical treatment tank of biochemistry pool and second pond all adopt 8mm stainless steel plate to be welded.The parts that biochemistry pool comprises have: diameter 230mm, are highly flow tube, flow-stopping plate, sludge outlet and water outlet in the aeration corrugated tube 72 of 1200mm, water inlet pipe, inlet pipe, mud return line, second pond, second pond.Except water inlet pipe and water outlet, all the other all parts are for ensureing that sealing property all adopts stainless steel welded.Water inlet pipe and water outlet junction mounting flange, the water outlet of biochemical treatment tank is positioned at the top of biochemical treatment tank, and water-in and water outlet are separately positioned on two relative sidewalls of biochemical treatment tank.The about 36.29m of biochemical treatment pool volume
3.Water inlet flow velocity is 4m
3in/h situation, this equipment hydraulic detention time is approximately 10 hours (comprising second pond).
Whole technical process: provide air by roots blower to aeration corrugated tube, aeration rate is judged by gas-water ratio, the i.e. ratio of volume of air and volume of water.Generally old oil trap gas-water ratio is 25:1, namely will pass into 25 cubes of air in every 1 cube of water.Dissolved oxygen content is 3.5-6mg/l, and sludge loading is 0.22kg BOD5/kg.d, and return sludge ratio is 30%, and sludge settling ratio is 30%-50%.Active sludge used is aerobic active sludge, and active sludge can be prepared by the following method:
Tap water is passed in biochemistry pool, preaeration 20-30h;
Add the active sludge taking from field area municipal sewage plant, active sludge does not dewater, and makes the settling ratio of the active sludge in biochemistry pool be 20%-30%, then the vexed 36-60h that exposes to the sun;
The part supernatant liquor of biochemistry pool is discharged, the volume of the supernatant liquor of discharging accounts for the 8%-15% of biochemistry pool volume, then supplement and add bearing sewage for ternary combination flooding in oil, the vexed 48h-72h that exposes to the sun, repeat this step 8-12 time, by adding glucose, urea and potassium primary phosphate in this process, the mass ratio of C, N, P in biochemistry pool is made to be 100:4-6:0.8-1.1;
With 2.5-3.5m
3the speed of/h adds bearing sewage for ternary combination flooding in oil continuously, the dissolved oxygen controlled in biological tank is 4-10mg/L, temperature is 18-29 DEG C, pH is 8.5-11.0, repeatedly can add fecal sewage in this process, fecal sewage adds in the following manner: discharged by the water in biological tank, supplements and adds fecal sewage, the vexed 20-30h that exposes to the sun, this process is run altogether continuously can obtain active sludge in 30-50 days;
Wherein, vexedly expose to the sun in process, the dissolved oxygen controlled in biological tank is 4-10mg/L, and temperature is 18-29 DEG C, pH is 8.5-11.0.
Sewage enters biochemical treatment tank via water-in, amounts to 30m in biochemical treatment tank containing the active sludge of having tamed
3.72 aeration corrugated tubes are uniformly distributed a large amount of solarization air cap, and Xiang Chizhong is filled with air, for the growth of the seed activity mud suspended provides enough oxygen, and makes active sludge be in the tumbling state of trace.
Meanwhile, growth upholder is fixed between aeration corrugated tube file by steel pipe, and growth upholder is diameter is 6cm plastic sheet, and the two sides of plastic sheet has length to be approximately the fiber of 10cm, amounts to about 100.Install 20 groups altogether between aeration corrugated tube file, often organize 10 plastic supports, plastic supports all flood with the water surface under.Active sludge adheres on biofilm development upholder, and growth reproduction, form microbial film, utilize microbial film to adsorb dirty Organic substance in water, degrade, sewage better purifies.Biochemistry pool provided by the invention is the reactor of two kinds of methods combining, and the first is conventional activated sludge process, and the second is biomembrance process.
When sewage is after the process of active sludge, the water outlet through biochemical treatment tank flows into second pond.Biochemical treatment tank water outlet is arranged in second pond flow tube, and these catheter collection current, avoid current splashes.Under the guiding of second pond flow tube, current become columnar flow through flow-stopping plate, flow-stopping plate, dispersing water flow, make its flowing of slowing down to both sides, avoid resuspended for second pond base sludge.Sewage through biochemical treatment tank process enters into second pond, and under gravity, the suspended substance in sewage, active sludge fragment etc. are separated with water, and active sludge falls to bottom second pond.The mud of precipitation is back in biochemical treatment tank by mud return line, and reflux ratio is 30%.Compared to other activated sludge processes, it is few that present method produces surplus sludge volume, greatly reduces the running cost because excess sludge process causes.
When sewage quality worsens, namely in sewage, oleaginousness is greater than 10000mg/l, and when suspension content is more than 500mg/l, two biochemistry pool series connection use.When connecting use, the aeration rate of biochemistry pool two turn down to gas-water ratio 20:1 (according to practical situation even can directly by biochemistry pool two by active sludge/biomembrance process, be directly changed into and adopt SBR (sequencing batch active sludge) reactor), other parameter constants.
Last it is noted that above each embodiment is only in order to illustrate technical scheme of the present invention, be not intended to limit; Although with reference to foregoing embodiments to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a biochemistry pool, is characterized in that, comprises biochemical treatment tank and second pond;
Described biochemical treatment tank is provided with water-in and inlet mouth, the bottom of described biochemical treatment tank is provided with aeration corrugated tube, and described aeration corrugated tube distributes solarization air cap, and described inlet mouth is communicated with described aeration corrugated tube by intake ducting;
Described biochemical treatment tank is provided with inlet channel, and one end of described inlet channel connects described water-in, and the other end of described inlet channel stretches into the bottom of described biochemical treatment tank;
Described biochemical treatment tank is also provided with water outlet, described water outlet connects outlet conduit, described outlet conduit stretches in described second pond;
The bottom of described second pond is provided with sludge outlet, and top is provided with water port.
2. biochemistry pool according to claim 1, it is characterized in that, described second pond is provided with flow tube, and the number of described outlet conduit is more than 1, the outlet of described outlet conduit is all arranged in described second pond flow tube, and the below of described flow tube is provided with flow-stopping plate.
3. biochemistry pool according to claim 1, is characterized in that, the bottom of described second pond is tapered.
4. biochemistry pool according to claim 3, is characterized in that, described biochemistry pool also comprises mud return line, and the bottom of described second pond is stretched in one end of described mud return line, and the other end stretches in described biochemical treatment tank;
The position of described mud return line corner is connected with tracheae.
5. biochemistry pool according to claim 1, is characterized in that, described solarization air cap gathers on described aeration corrugated tube, and the bottom of described biochemical treatment tank is provided with multiple aeration corrugated tube, and the bottom of described aeration corrugated tube is communicated by described intake ducting.
6. biochemistry pool according to claim 5, is characterized in that, is provided with biofilm development upholder between described aeration corrugated tube.
7. biochemistry pool according to claim 6, is characterized in that, described biofilm development upholder is the plastic sheet of two sides with fiber.
8. biochemistry pool according to claim 7, is characterized in that, the diameter of described plastic sheet is 5-8cm, and the length of described fiber is 8-15cm.
9. biochemistry pool according to claim 1, is characterized in that, described biochemical treatment tank adopts stainless steel plate to be welded.
10. the biochemistry pool according to any one of claim 1-9, is characterized in that, two described biochemistry pool series connection.
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| CN201510400709.5A CN104891649A (en) | 2015-07-09 | 2015-07-09 | Biochemical pool |
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| CN201510400709.5A CN104891649A (en) | 2015-07-09 | 2015-07-09 | Biochemical pool |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109205697A (en) * | 2018-09-26 | 2019-01-15 | 骆玉蓉 | It is convenient for the multistage liquid stream sewage disposal device removed contamination using siphon principle |
| CN109956542A (en) * | 2019-04-16 | 2019-07-02 | 凯发新泉(天津)污水处理有限公司 | A kind of sewage treatment biochemical system being conducive to microbial reproduction |
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| CN85109440A (en) * | 1985-12-23 | 1987-07-08 | 无锡轻工业学院 | The solution-air circulation bioreactor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109205697A (en) * | 2018-09-26 | 2019-01-15 | 骆玉蓉 | It is convenient for the multistage liquid stream sewage disposal device removed contamination using siphon principle |
| CN109956542A (en) * | 2019-04-16 | 2019-07-02 | 凯发新泉(天津)污水处理有限公司 | A kind of sewage treatment biochemical system being conducive to microbial reproduction |
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Application publication date: 20150909 |