CN203737104U - Ethylene oxide waste gas treatment system based on biodegradation - Google Patents
Ethylene oxide waste gas treatment system based on biodegradation Download PDFInfo
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- CN203737104U CN203737104U CN201320837966.1U CN201320837966U CN203737104U CN 203737104 U CN203737104 U CN 203737104U CN 201320837966 U CN201320837966 U CN 201320837966U CN 203737104 U CN203737104 U CN 203737104U
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Abstract
The utility model discloses an ethylene oxide waste gas treatment system based on biodegradation. The treatment system treats ethylene oxide waste gas dissolved in wastewater on the basis of an aeration tank, a settling basin and a filter tank, and also can treat organic maters in the wastewater; microbiological degradation is realized through oxygenation degradation of the ethylene oxide waste gas dissolved in wastewater mainly based on a microbial flora forming a flocculating constituent in the aeration tank; when the oxygenation degradation of the microbial flora is aerobic biological treatment, organic matters including ethylene oxide are converted in the condition of sufficient oxygen, assimilation synthesis and dissimilation decomposition of the organic matters are implemented through microorganisms, and finally CO2, H2O, NH3, SO2 and the like are generated and are discharged along with water, thus treating the ethylene oxide waste gas.
Description
Technical field
The utility model belongs to ethylene oxide sterilizing technical field, relates to a kind of based on biodegradable oxirane exhaust treatment system.
Background technology
Oxirane has another name called ethylene oxide, is colourless liquid at low temperatures, has aromatic ether taste, and boiling point is 10.8 DEG C, and density is 1.52; Oxirane is inflammable and explosive, and its minimum burning concentration is 3%.Ethylene oxide gas sterilizing power is strong, fungicidal spectrum is wide, can kill various microorganisms and comprise bacterial spore, belongs to bactericidal agent.
Article and penetration power that oxirane does not damage sterilizing are very strong, should not sterilize and sterilizing with the equal epoxy available ethane of the article of conventional method sterilizing therefore most.For example, electronic instrument, optical instrument, medicine equipment, books, file, fur, cotton, chemical fibre, plastic products, woodwork, pottery and metallic article, scope, dialyzer and disposable diagnosis and treatment articles for use etc.Oxirane is one of current topmost low temperature sterilization method.The factor that affects eo sterilization is a lot, only has strict control related factors, just can reach sterilization effect.
Due to inflammable, the explosive and carcinogenicity of oxirane, the control of eo sterilization is at present also more difficult, and especially the harmless treatment of oxirane waste gas is a current difficult problem.Also it is pointed out that currently used its waste gas of ethylene oxide sterilizing technology there is no to process is just directly discharged in the middle of air, so just exists very large environment hidden danger and safe pressure, is problem very in the urgent need to address.
Utility model content
It is a kind of based on biodegradable oxirane exhaust treatment system that the problem that the utility model solves is to provide, and adopts microorganism to carry out innoxious degraded to oxirane waste gas, is conducive to using and promoting of ethylene oxide sterilizing.
The utility model is to be achieved through the following technical solutions:
A kind of based on biodegradable oxirane exhaust treatment system, comprise the aeration tank, settling tank and the filtering ponds that are connected by pipeline; Wherein:
The water inlet of aeration tank is connected with oxirane waste gas dissolver, and delivery port is connected with the water inlet of settling tank, and microorganism species suspends or forms floccule body and is suspended in the water of aeration tank; In aeration tank, be also provided with dissolved oxygen control device;
Settling tank is vertical-flow settling tank, wherein erects and has multiple grids that are interspersed, and opening is formed on grid and settling tank top or bottom; Settling tank is also provided with the reflux line being connected with aeration tank, by reflux line by the microorganism species of sedimentation and part return of waste water to aeration tank, the microorganism species of remaining sedimentation and the foreign material of sedimentation are discharged from exhaust outlet; The delivery port of settling tank is connected with the water inlet of filtering ponds;
Filtering ponds form at the bottom of by pool wall and pond, and pool wall, pond basal surface are all equipped with filtrate, and the particle diameter of filtrate increases with the filtering ponds degree of depth and strengthens gradually, is also provided with multiple filtration net in filtering ponds; When flowing into, is behind filter tank waste water, by flowing out from pond bottom opening after multiple filtration.
In described aeration tank, be also provided with multiple gallerys that are interspersed, gallery opening head and the tail stagger, and form gallery type aeration tank, and gallery bottom is provided with the gradient, and waste water flows downward along the gallery gradient.
Describedly also offer in gallery bottom the aeration opening or the air-blowing mouth that are connected with air, for the waste water between gallery provides dissolved oxygen amount.
Described being positioned between middle gallery is also provided with mixer, after mixer is driven, offers stirring, increases the dissolved oxygen amount of end gallery waste water, improves the wherein living environment of microorganism species.
In described aeration tank, be also provided with motor-driven dull and stereotyped impeller, dull and stereotyped impeller extend in waste water, and impeller diameter is 0.25～0.4 with the ratio that stretches into the depth of water, and the diameter of dull and stereotyped impeller is 0.8～1.2m.
Between described aeration tank and settling tank, be also provided with microorganism and repair groove, aeration tank waste water after treatment first flow into microorganism and repairs in groove, and then flows out in settling tank;
Described microorganism is repaired groove and comprises cell body, is provided with multiple bacterium nests that contain culture medium in cell body, and on culture medium, inoculation has microorganism species; Microorganism is repaired groove and is also provided with the reflux line being connected with aeration tank, and the return of waste water that contains microorganism species by reflux line is to aeration tank.
In the cell body of described microorganism reparation groove, be provided with the chain row who is connected between driving wheel and driven pulley, bacterium nest is fixedly connected on chain row, on chain row, be also fixed with scraper plate, drive driving wheel to make chain row circulating rolling, the microorganism species of sedimentation and foreign material are moved to reflux line entrance or outlet place by scraper plate.
On described cell body, offer with aeration tank and export the water inlet being connected, the delivery port being connected with settling tank, is also provided with collecting box at outlet place.
Described bacterium nest comprises pedestal, on pedestal, be connected with guard, inoculation has the culture medium of microorganism species to be placed in guard, also offers the through hole matching with screw on pedestal, screw is connected with through hole through guard, culture medium, and guard, culture medium are fixed on pedestal.
Between described screw and guard, be provided with flat shim; Pedestal is fixedly connected with chain row by colloid.
Its water inlet of described settling tank is mutually concordant with delivery port, in described settling tank, erects and has multiple grids that are interspersed, and opening is formed on grid and settling tank top or bottom, and adjacent apertures is staggered up and down.
In described filtering ponds, adopt baton round as filtrate, it adopts the baton round of diameter 100～150mm at the bottom of pond, adopts the baton round of diameter 25～50mm at Chi Ding; Also be provided with multiple padding layer as filter screen at the middle part of filtering ponds, padding layer is provided with cellular ponding plastics orifice plate.
The pool wall of described filtering ponds adopts masonry concrete framework, and at the bottom of pond, 15～20% of cross-sectional area adopt perforation concrete plate arrange and form, and between perforation concrete plate is adjacent, spacing 1～10cm is parallel evenly arranges.
Compared with prior art, the utlity model has following useful technique effect:
The utility model provide based on biodegradable oxirane exhaust treatment system, be based on aeration tank, settling tank, filtering ponds, the oxirane waste gas (the dissolving quality of oxirane waste gas is generally 2～5%) being dissolved in waste water to be processed, also can realize organic processing in waste water simultaneously.Wherein microbial degradation is mainly that microorganism species based on forming floccule body in aeration tank carries out oxygenate degraded to the oxirane waste gas being dissolved in the water; Be aerobe processing in the time that microorganism species carries out oxygenate degraded time, the organic conversion including oxirane is under the condition of oxygen abundance, by microorganism, organic matter is carried out with being combined to, and alienation is decomposed, and finally generates CO
2, H
2o, NH
3, SO
2deng, they are drained with water, have realized the processing to oxirane waste gas.And realize microorganism species, sedimentation foreign material and the shunting of processing rear water by settling tank, part microorganism species and waste water are back to aeration tank by the mode refluxing simultaneously, ensure the concentration of microorganism species in aeration tank, and can again degrade to part waste water, and strengthen the mobility of waste water in aeration tank.And the filtration of filtering ponds has ensured that microorganism species further separates with water with precipitum, make the water after filtering both there is no ethylene oxide gas, there is no microorganism species residual of floccule body yet; For safety, can also carry out inactivation treatment to the microorganism species after sedimentation and precipitum.
After oxirane waste gas is dissolved in the water, pending waste water Continuous Flow through aeration tank, settling tank (floccule body, foreign material, solid, transport), filtering ponds, wherein, in aeration tank, utilize absorption and the metabolism of microorganism species, degraded oxirane waste gas carries out sedimentation by microorganism species and foreign material that can sedimentation in settling tank, then discharge after filtering by filtering ponds;
(oxirane waste water is cultivated in described aeration tank, to be provided with in advance the waste water that contains cultivation acclimated microorganism flora, the bacterium later living recycles, dead bacterium forms floccule body), microorganism species forms floccule body and is suspended in waste water, aeration tank is also provided with dissolved oxygen control device, maintain the dissolved oxygen concentration in waste water, for microorganism species provides oxygen; In the time being dissolved with the waste water of oxirane waste gas and flowing in aeration tank, the oxirane in the microorganism species degrading waste water in aeration tank.
Brief description of the drawings
Fig. 1 is handling process schematic diagram of the present utility model;
Fig. 2 is aeration tank, settling tank, filtering ponds connection diagram;
Fig. 3 is the schematic diagram of gallery type aeration tank;
Fig. 4 is the schematic diagram of sedimentation basin;
Fig. 5 is the structural representation that microorganism is repaired groove; Wherein, 501 is water inlet, and 502 is cell body, and 503 is driving wheel, and 504 is bacterium nest, and 505 is scraper plate, and 506 is chain row, and 507 is driven pulley, and 508 is delivery port, and 509 is collecting box;
Fig. 6 is the structural representation of microorganism species procreation groove; Wherein, 1 is pedestal, and 2 is guard, and 3 is flat shim, and 4 is screw, and 5 is microorganism species, and 6 is culture medium.
Detailed description of the invention
Below in conjunction with specific embodiment, the utility model is described in further detail, described in be to explanation of the present utility model instead of restriction.
Referring to Fig. 1, the utility model provide based on biodegradable oxirane exhaust treatment system, be based on aeration tank, settling tank, filtering ponds, the oxirane waste gas being dissolved in waste water to be processed, comprise following operation:
After oxirane waste gas is dissolved in the water, pending waste water Continuous Flow through aeration tank, settling tank, filtering ponds, wherein, in aeration tank, utilize absorption and the metabolism of microorganism species, degraded oxirane waste gas, in settling tank, microorganism species and foreign material that can sedimentation are carried out to sedimentation, then discharge after filtering by filtering ponds;
In described aeration tank, be provided with in advance and contain the waste water of cultivating acclimated microorganism flora, microorganism species is suspended in water or forms floccule body and is suspended in water, aeration tank is also provided with dissolved oxygen control device, maintains the dissolved oxygen concentration in waste water, for microorganism species provides oxygen; In the time being dissolved with the waste water of oxirane waste gas and flowing in aeration tank, the oxirane in the microorganism species degrading waste water in aeration tank;
Described settling tank is vertical-flow settling tank, wherein erects and has multiple grids that are interspersed, and opening is formed on grid and settling tank top or bottom; In the time that aeration tank waste water after treatment flow in settling tank, microorganism species is deposited in the bottom of settling tank; The bottom of settling tank is provided with the reflux line being connected with aeration tank, by reflux line by the microorganism species of sedimentation and part return of waste water to aeration tank, the microorganism species of remaining sedimentation and the foreign material of sedimentation are discharged from exhaust outlet;
Its pool wall of described filtering ponds, pond basal surface are all equipped with filtrate, and the particle diameter of filtrate increases with the filtering ponds degree of depth and strengthens gradually, is also provided with multiple filtration net in filtering ponds; In the time that filter tank has been in settling tank waste water inflow after treatment, by flowing out from pond bottom opening after multiple filtration.
Below in conjunction with links to the utility model further instruction.
Microbial degradation is mainly that the microorganism species based on forming floccule body in aeration tank carries out oxygenate degraded to the oxirane waste gas being dissolved in the water; Be aerobe processing in the time that microorganism species carries out oxygenate degraded time, the organic conversion including oxirane is under the condition of oxygen abundance, by microorganism, organic matter is carried out with being combined to, and alienation is decomposed, and finally generates CO
2, H
2o, NH
3, SO
2deng, they are drained with water, have realized the processing to oxirane waste gas.
Microbial degradation organic substance decomposing procedure schema is as follows:
Before carrying out microbial degradation, for oxirane waste gas, carry out following processing in early stage:
Oxirane waste gas is dissolved in the water, controls the ethylene oxide concentration that is dissolved in waste water, so that the degraded of microorganism; Can oxirane waste gas be removed to a part by chemical reaction by early stage and control ethylene oxide concentration, to make the ethylene oxide concentration in waste gas can be by water-soluble solution; Besides by water temperature control, increase oxirane and water contact impel oxirane to be dissolved in water.
Described aeration tank effect is to supply dissolved oxygen to liquid phase, promotes biochemical reaction, and immixture promotes that microorganism species contacts with organic matter, pollutant in water.
In described aeration tank, be also provided with multiple gallerys that are interspersed, gallery opening head and the tail stagger, and form gallery type aeration tank, and gallery bottom is provided with the gradient, and waste water flows downward along the gallery gradient.Also offer in gallery bottom the aeration opening or the air-blowing mouth that are connected with air, for the waste water between gallery provides dissolved oxygen amount.
Further, described being positioned between middle gallery is also provided with mixer, after mixer is driven, offers stirring, increases the dissolved oxygen amount of end gallery waste water, improves the wherein living environment of microorganism species.In described aeration tank, be also provided with motor-driven dull and stereotyped impeller, dull and stereotyped impeller extend in waste water, and impeller diameter is 0.25～0.4 with the ratio that stretches into the depth of water, and the diameter of dull and stereotyped impeller is 0.8～1.2m.
Concrete, in aeration tank, being also provided with multiple gallerys that are interspersed, gallery opening head and the tail stagger, and form gallery type aeration tank, and gallery bottom is provided with the gradient, and waste water flows downward along the gallery gradient.Concrete referring to Fig. 2, standard type rectangle plug-flow gallery type, with four gallerys, abbreviation four gallery plug-flow aeration tanks.
For meeting the needs that stir, wide, the dark ratio of regulation gallery is less than 2m, specifically selects 1.5m, and prescribed depth is 3～5m, preferably 3m, and wide is 4.5m.For preventing short stream, regulation gallery length-width ratio should be greater than 4～5, preferably 6m, and pond is long is 27m.Like this inside dimension of aeration tank for the wide x of long x high=27x4.5x3m.During for anti-mixing, mixed liquor is excessive, highly increases to 3.5m, the high 3m of liquid level, and 364.5 cubic metres of volumes, for preventing that waste water and flora from, in the diffusion of pond face, forming short stream, general water inlet is located under water.Water inlet is pulled control, water outlet downflow weir control with lock.
The degree of depth understanding of aeration tank differs, the economic depth of recommending is 4-5m, in use, most units use Inka aeration pond, its advantage is that the area contacting with air is large, cost economic, but along with land used growing tension, developed again now deep water aeration tank, Chi Shen is generally 20m and has plenty of 50m, even 150m.
Give mixed liquor oxygenation mode a lot, concrete mechanical agitation applicatory has two kinds of modes available: a. motor forces and stirs selected impeller form is dull and stereotyped impeller.Impeller and aeration cylinder diameter ratio are 1/3～1/5 to be advisable in accordance with regulations, and gallery is 6.75m*4.5m, is 1m therefore select dull and stereotyped impeller diameter.Impeller diameter should be 2/5～1/4 with the ratio of the depth of water in accordance with regulations.Selected impeller diameter is 1m, and the depth of water is 3m, on the occasion of in this scope, illustrates that type selecting is reasonable.Impeller is havoc flora floccule body too, too little oxygenation deficiency again.Mixed liquor is too dark, and bottom water turns on being difficult for stirring, and easily forms stagnant water layer.Therefore we select depth of water 3m, impeller diameter 1m is rational.
The calculating of dull and stereotyped impeller:
The oxygenation capacity of aeration tank: regulation requirement, the dissolved oxygen concentration of aeration tank must not be lower than 2mg/L.
Selected aeration tank volume is 364.5m
3.
Oxygenation capacity Qs=364.5*10
3* 2*10=0.729kg
In other words, 364.5m in aeration tank
3volume must have 0.729kg oxygen, and this is the condition that maintains minimum balance, considers all impacts in actual use, and Qs can reach 5～10kg.The shaft power of selected motor is 4KW.Impeller height H=110mm, the number of blade 26, gets 12.Impeller edge is 800mm far from the minimum range of pool wall, and bracket bottom to the minimum range on impeller top is 800mm.
Gallery pulling flow type rectangle aeration tank, waste water flows into from one end, advances with spiral-flow type, through mixing with gas, and flows through behind whole aeration tank, flows out to end.It has following features: (1), control on the length direction of aeration tank, the living environment of microorganism constantly changes, and nutrients constantly reduces.(2), at the aeration tank waste water end that becomes a mandarin, the utilization rate of oxygen is very high, and the utilization rate of outflow end oxygen is very low.Just because of this, we are forcing mixer to be contained in the 3rd gallery.Can make like this dissolved oxygen amount of end increase, improve the living environment of microorganism.
Microorganism species cultivation and domestication
After build up aeration tank, before operation, must carry out cultivation and the domestication of microorganism species (P-L activation mutagenesis flora), the cultivation domestication of described microorganism species is undertaken by following operation;
1) in mutagenesis flora procreation groove, pass into the water that contains oxirane, wherein the mass concentration of oxirane be 2～5%, 25～35 DEG C of water temperatures, flow velocity 0.075～0.175M/min, and the pH that controls water is 6.5～7.5;
2) under aeration condition, at inoculation of medium microorganism species, and culture medium is put in activation mutagenesis flora procreation nest, then activation mutagenesis flora procreation nest is put into induction in mutagenesis flora procreation groove and cultivated;
3) after Continuous Cultivation, collect the thalline in activation mutagenesis flora procreation nest, and put in P-L activation mutagenesis flora procreation nest after planting culture medium, in mutagenesis flora procreation groove, continue to cultivate; Collect the precipitum that comprises thalline in current simultaneously, after the thalline in precipitum is separated, be inoculated in culture medium, then put in P-L activation mutagenesis flora procreation nest, in mutagenesis flora procreation groove, continue to cultivate;
4) after repeatedly cultivating according to step 3) repetitive cycling, collect the thalline in activation mutagenesis flora procreation nest, mix, obtain the activation mutagenesis flora of oxirane mutagenesis.
The microorganism species of inoculating on described culture medium comprises the microorganism species of following kind:
The bacterial classification that unlinks belongs to (Cycloclast), vibrio (Virbria), zygosaccharomyces (Dseudomonas), photosynthetic bacteria (Photosynthesisbacteria), Nitrobacter (Nitrobacter or Nitrosmonas), bacillus (bacillus), lactic acid bacteria (lactobacillus), hay bacillus (subtilis), actinomyces (Actinomycete), saccharomycete (microzyme), Acetobacter (Acetobacter), azotobacter (Azotobacter), Escherichia coli (Escherichia Coil), gas enterobacteria (Enterobcteraerogenes), through spore saccharomycete (Frichospomn Cutatmum), pseudomonas (pseudomona sp).
P-L activates the performance of mutagenesis flora, is determining the quality of clean-up effect.Require flora grain loose in absorption phase, surface area is large, easily adsorb organic compound; In the mud-water separation stage, wish cohesion and settling property that flora has had.
The index of reflection flora performance has, flora concentration (MLSS), the i.e. concentration of mixed liquor suspended solid, MLSS; Flora settling ratio (SV); Flora bulk index (SVI) and flora dnesity index (SDI).
Flora concentration (MLSS)
It refers to the mixed liquor of waste water and P-L activation mutagenesis flora in aeration tank, the concentration of suspended solid.In engineering, often activate the index of mutagenesis flora microbial biomass using MLSS as indirect metering P-L.
Flora settling ratio (SV)
Flora settling ratio refers to aeration tank mixed liquor, in 100mg graduated cylinder, leaves standstill after 30min the volume ratio (%) of sedimentation flora and mixed liquor.It is to evaluate P-L activation mutagenesis flora important indicator.The SV value of general municipal sewage is in 15～20% normal range (NR), and flora concentration is excessive, and discharge unit flora, exceeds normal range of operation, analyze reason.
Flora index (SVI)
Mixed number more than aeration tank.Leaving standstill after 30min, every gram of volume (ml) that suspended solid occupies, is called flora bulk index.Its value is calculated with following formula:
If SV=30%, X is that mixed liquor suspended solid, MLSS concentration equals 3000mg/L,
Flora dnesity index (SDI)
Aeration tank mixed liquor, is leaving standstill after 30min, and the grams of the P-L activation mutagenesis flora suspended solid in 100ml sedimentation flora, is called flora dnesity index.
Flora index (SVI)
Also be to represent the flocking settling of P-L activation mutagenesis flora and the index of concentrated performance simultaneously.When SVI is low, settling property is good, but absorption property is poor.When SVI is high, settling property is bad, even if there is good absorption property, and can not fine control mud-water separation.Under normal circumstances, municipal sewage SVI value is between 50-150.
The performance monitoring of P-L activation mutagenesis flora
Flora settling ratio (SV) is with < 30% for well, and every 2-4h measures once.
Flora index (SVI), taking 50-150 as desirable, reaches more than 200, and flora may expand.
Flora concentration (MLSS or MLVSS), conventionally MLSS=1500～2000mg/L.The essential condition of the efficient operation of oxygen P-L activation mutagenesis flora method.How many oxygen supplys generally uses mixed liquor.The concentration control of dissolved oxygen, dissolved oxygen concentration is advisable to be not less than 2mg/L in general.
So, the microorganism species according in the waste water of following requirement control aeration tank:
Flora concentration is 1500～2000mg/L, and described flora concentration refers to the concentration of the flora floccule body suspending in the waste water of aeration tank;
Flora settling ratio < 30%, every 2～4h measures once; Described flora settling ratio refers to that aeration tank waste water leaves standstill after 30min, the volume ratio of sedimentation flora and waste water;
Flora bulk index is 50～150ml/g, and described flora bulk index refers to that aeration tank waste water leaves standstill after 30min, and the volume that the flora floccule body of every gram of suspension occupies, calculates with ml/g;
And control dissolved oxygen concentration in the waste water of aeration tank and be not less than 2mg/L.
Between described aeration tank and settling tank, be also provided with microorganism and repair groove, aeration tank waste water after treatment first flow into microorganism and repairs in groove, and then flows out in settling tank;
Described microorganism is repaired in groove and is provided with multiple bacterium nests that contain culture medium, on culture medium, inoculation has the microorganism species of cultivating acclimated microorganism flora or settling tank sedimentation through aeration tank, microorganism species is multiplied growth and is repaired in groove and spread in microorganism in bacterium nest, in the time that waste water flow into microorganism reparation groove, the oxirane of remnants in microorganism species degrading waste water; Microorganism is repaired groove and is also provided with the reflux line being connected with aeration tank, and the return of waste water that contains microorganism species by reflux line is to aeration tank.
In described microorganism reparation groove, be provided with the chain row who is connected between driving wheel and driven pulley, bacterium nest is fixedly connected on chain row, on chain row, be also fixed with scraper plate, by driving driving wheel to make chain row circulating rolling, the microorganism species of sedimentation and foreign material are moved to reflux line entrance or outlet place by scraper plate; And the microorganism species being suspended in waste water flow in settling tank with waste water.
In mass fraction, the component of described culture medium comprises:
2～5% maltose, 2.5～10% glucose, 15～20% agar, 1～1.5% dipotassium hydrogen phosphate, 5～10% tryptone, 5～8% yeast extract, 10～15% beef extract, 15～25% soluble starch, distilled water complements to 100%;
The microorganism species of inoculating on culture medium comprises the microorganism species of following kind:
The bacterial classification that unlinks belongs to (Cycloclast), vibrio (Virbria), zygosaccharomyces (Dseudomonas), photosynthetic bacteria (Photosynthesisbacteria), Nitrobacter (Nitrobacter or Nitrosmonas), bacillus (bacillus), lactic acid bacteria (lactobacillus), hay bacillus (subtilis), actinomyces (Actinomycete), saccharomycete (microzyme), Acetobacter (Acetobacter), azotobacter (Azotobacter), Escherichia coli (Escherichia Coil), gas enterobacteria (Enterobcteraerogenes), through spore saccharomycete (Frichospomn Cutatmum), pseudomonas (pseudomona sp).
Settling tank
The quality of settling tank task performance directly affects operation and the treatment effect of whole system.Its effect is the P-L activation mutagenesis flora separating in the water outlet of aeration tank.Sedimentation effect is bad, not only affects effluent quality, and can reduce backflow flora concentration, affects from every side effluent quality.
The construction of settling tank, has three kinds of forms conventionally, i.e. flat flow, vertical-flow and radial-flow.Vertical-flow owing to obtaining larger flora concentration, and have take up an area few, and the advantage such as spoil disposal is convenient, thereby application is wider.
For convenience of management, the end face in settling tank and aeration tank and filter tank is contour.
Concrete, settling tank adopts grid vertical-flow, and it can primary water, can concentrate again flora, has possessed the functional requirement of sedimentation basin.Its water inlet of described settling tank is mutually concordant with delivery port, and described settling tank is vertical-flow settling tank, wherein erects and has multiple grids that are interspersed, and opening is formed on grid and settling tank top or bottom; In the time that aeration tank waste water after treatment flow in settling tank, flow along grid opening, waste water flow velocity is slow, and the microorganism species of suspension is deposited in the bottom of settling tank.
Flora return-flow system---the part in sedimentation basin and precipitation flora, then be back to aeration tank, rely and carry out the microorganism of biochemical reaction to supply aeration tank.Residue flora exhaust system---in aeration tank, flora constantly rises in value, and the flora of propagation, as residue flora, is discharged from exhaust system.
Filtering ponds
Biofilter, mainly by filtrate, at the bottom of pool wall, pond, cloth wetting system and drainage system composition.In described filtering ponds, adopt baton round as filtrate, it adopts the baton round of diameter 100～150mm at the bottom of pond, adopts the baton round of diameter 25～50mm at Chi Ding; Middle part at filtering ponds is also provided with multiple padding layer, and padding layer is provided with cellular ponding plastics orifice plate.
Filtrate is biofilm medium, on the task performance impact of biofilter greatly.We select baton round to do filtrate, and it can meet the whole requirements to filtrate completely.This surface can reach 100～200m
2/ m
3, porosity is up to 80～95%, and air stream is had friendly relations.
Masonry concrete framework for pool wall.At the bottom of pond, make with perforation concrete plate, it is easy to process, installs easily, does not misplace, and have enough infiltrations and draught area while stacking filtrate.It is generally acknowledged that this area should reach 15～20% of filter tank cross-sectional area.Therefore, the pool wall of described filtering ponds adopts masonry concrete framework, and at the bottom of pond, 15～20% of cross-sectional area adopt perforation concrete plate arrange and form, and between perforation concrete plate is adjacent, spacing 1～10cm is parallel evenly arranges.
Scheme is built in aeration tank, sedimentation basin and filter tank jointly, as shown in Figure 3, Figure 4.Why three builds jointly, and the 1st, convenient management, the 2nd, build economy, the 3rd, layout is reasonable.
Backflow flora from sedimentation basin to aeration tank, wants to reach proper flow, without power in the situation that, refluxes by siphon, and possibility is very little, can only, in water inlet pipe threeway place of aeration tank, be processed with the joint of throat, causes flora to reflux by the negative pressure of throat.
Provide the cyclic microorganism that repair an aeration tank, microorganism, settling tank forms below, and with the embodiment of this oxirane of degrading:
Based on biodegradable oxirane exhaust treatment system, comprise the aeration tank, settling tank and the filtering ponds that are connected by pipeline;
The water inlet of aeration tank is connected with oxirane waste gas dissolver, and delivery port is connected with the water inlet of settling tank, is placed with and cultivates acclimated microorganism flora in aeration tank, and microorganism species is suspended in water or forms floccule body and is suspended in water; In aeration tank, be also provided with dissolved oxygen control device, maintain the dissolved oxygen concentration in waste water, for microorganism species provides oxygen;
Settling tank is vertical-flow settling tank, wherein erects and has multiple grids that are interspersed, and opening is formed on grid and settling tank top or bottom; Settling tank is also provided with the reflux line being connected with aeration tank, by reflux line by the microorganism species of sedimentation and part return of waste water to aeration tank, the microorganism species of remaining sedimentation and the foreign material of sedimentation are discharged from exhaust outlet; The delivery port of settling tank is connected with the water inlet of filtering ponds;
Filtering ponds form at the bottom of by pool wall and pond, and pool wall, pond basal surface are all equipped with filtrate, and the particle diameter of filtrate increases with the filtering ponds degree of depth and strengthens gradually, is also provided with multiple filtration net in filtering ponds; When flowing into, is behind filter tank waste water, by flowing out from pond bottom opening after multiple filtration.
Referring to Fig. 5, Fig. 6, between described aeration tank and settling tank, be also provided with microorganism and repair groove, aeration tank waste water after treatment first flow into microorganism and repairs in groove, and then flows out in settling tank;
Described microorganism is repaired groove and comprises cell body 502, is provided with multiple bacterium nests 504 that contain culture medium in cell body 502, and on culture medium, inoculation has microorganism species; Microorganism is repaired groove and is also provided with the reflux line being connected with aeration tank, and the return of waste water that contains microorganism species by reflux line is to aeration tank.
In the cell body 502 of described microorganism reparation groove, be provided with the chain row 506 who is connected between driving wheel 503 and driven pulley 507, bacterium nest 504 is fixedly connected on chain row 506, on chain row 506, be also fixed with scraper plate 505, drive driving wheel 503 to make chain arrange 506 circulating rollings, the microorganism species of sedimentation and foreign material are moved to reflux line entrance or outlet place by scraper plate 505.
On described cell body 502, offer with aeration tank and export the water inlet 501 being connected, the delivery port 508 being connected with settling tank, is also provided with collecting box 509 at outlet place.
Described bacterium nest 504 comprises pedestal 1, on pedestal 1, be connected with guard 2, inoculation has the culture medium of microorganism species to be placed in guard 2, also offers the through hole matching with screw 4 on pedestal 1, screw 4 is connected with through hole through guard 2, culture medium 6, and guard 2, culture medium 6 are fixed on pedestal.
Between described screw and guard, be provided with flat shim 3; Pedestal 1 is fixedly connected with chain row by colloid.
In the time carrying out the degraded of oxirane waste gas, comprise the following steps:
In aeration tank (10m × 8m × 5m), throw in culture medium and microorganism species, and to make flora concentration be 1500mg/L, flora bulk index is 50ml/g, and to control aeration tank oxygen in water concentration be 2mg/L; Then pass into the current that contain oxirane, wherein the mass concentration of oxirane be 3%, flow velocity 0.1M/min;
Multiple P-L activation mutagenesis floras procreation nests are set in microorganism reparation groove, place culture medium and inoculate the above-mentioned floras such as bacterial classification genus that unlink, inflow velocity 0.15L/min, the speed that flows to settling tank is 0.75L/min, the speed that is back to aeration tank is 0.75L/min; The speed that settling tank is back to aeration tank is 0.25L/min; In filtering ponds detected downstream ethylene oxide content situation of change;
In previous month, ethylene oxide content detection is undesirable, then the water of filtering ponds is all back to aeration tank (can suitably stop aeration tank upland water when backflow); After one month, microorganism species system made, the oxirane after filtering ponds detects up to standard; Show that through repeated detection set up oxirane exhaust treatment system can be good at decomposing the oxirane in water.
Claims (13)
1. based on a biodegradable oxirane exhaust treatment system, it is characterized in that, comprise the aeration tank, settling tank and the filtering ponds that are connected by pipeline; Wherein:
The water inlet of aeration tank is connected with oxirane waste gas dissolver, and delivery port is connected with the water inlet of settling tank, and microorganism species suspends or forms floccule body and is suspended in the water of aeration tank; In aeration tank, be also provided with dissolved oxygen control device;
Settling tank is vertical-flow settling tank, wherein erects and has multiple grids that are interspersed, and opening is formed on grid and settling tank top or bottom; Settling tank is also provided with the reflux line being connected with aeration tank, by reflux line by the microorganism species of sedimentation and part return of waste water to aeration tank, the microorganism species of remaining sedimentation and the foreign material of sedimentation are discharged from exhaust outlet; The delivery port of settling tank is connected with the water inlet of filtering ponds;
Filtering ponds form at the bottom of by pool wall and pond, and pool wall, pond basal surface are all equipped with filtrate, and the particle diameter of filtrate increases with the filtering ponds degree of depth and strengthens gradually, is also provided with multiple filtration net in filtering ponds; When flowing into, is behind filter tank waste water, by flowing out from pond bottom opening after multiple filtration.
2. as claimed in claim 1ly it is characterized in that based on biodegradable oxirane exhaust treatment system, in described aeration tank, be also provided with multiple gallerys that are interspersed, gallery opening head and the tail stagger, form gallery type aeration tank, gallery bottom is provided with the gradient, and waste water flows downward along the gallery gradient.
3. as claimed in claim 2ly it is characterized in that based on biodegradable oxirane exhaust treatment system, also offer in gallery bottom the aeration opening or the air-blowing mouth that are connected with air, for the waste water between gallery provides dissolved oxygen amount.
4. as claimed in claim 2 based on biodegradable oxirane exhaust treatment system, it is characterized in that, described being positioned between middle gallery is also provided with mixer, after mixer is driven, offers stirring, the dissolved oxygen amount that increases end gallery waste water, improves the wherein living environment of microorganism species.
5. as claimed in claim 1 or 2 based on biodegradable oxirane exhaust treatment system, it is characterized in that, in described aeration tank, be also provided with motor-driven dull and stereotyped impeller, dull and stereotyped impeller extend in waste water, impeller diameter is 0.25～0.4 with the ratio that stretches into the depth of water, and the diameter of dull and stereotyped impeller is 0.8～1.2m.
6. as claimed in claim 1 based on biodegradable oxirane exhaust treatment system, it is characterized in that, between described aeration tank and settling tank, be also provided with microorganism and repair groove, aeration tank waste water after treatment first flow into microorganism and repairs in groove, and then flows out in settling tank;
Described microorganism is repaired groove and comprises cell body, is provided with multiple bacterium nests that contain culture medium in cell body, and on culture medium, inoculation has microorganism species; Microorganism is repaired groove and is also provided with the reflux line being connected with aeration tank, and the return of waste water that contains microorganism species by reflux line is to aeration tank.
7. as claimed in claim 6 based on biodegradable oxirane exhaust treatment system, it is characterized in that, in the cell body of described microorganism reparation groove, be provided with the chain row who is connected between driving wheel and driven pulley, bacterium nest is fixedly connected on chain row, on chain row, be also fixed with scraper plate, drive driving wheel to make chain row circulating rolling, the microorganism species of sedimentation and foreign material are moved to reflux line entrance or outlet place by scraper plate.
8. as claimed in claim 6ly it is characterized in that based on biodegradable oxirane exhaust treatment system, on described cell body, offer with aeration tank and export the water inlet being connected, the delivery port being connected with settling tank, is also provided with collecting box at outlet place.
9. as claimed in claim 6 based on biodegradable oxirane exhaust treatment system, it is characterized in that, described bacterium nest comprises pedestal, on pedestal, be connected with guard, inoculation has the culture medium of microorganism species to be placed in guard, on pedestal, also offer the through hole matching with screw, screw is connected with through hole through guard, culture medium, and guard, culture medium are fixed on pedestal.
10. as claimed in claim 9ly it is characterized in that based on biodegradable oxirane exhaust treatment system, between described screw and guard, be provided with flat shim; Pedestal is fixedly connected with chain row by colloid.
11. is as claimed in claim 1 based on biodegradable oxirane exhaust treatment system, it is characterized in that, its water inlet of described settling tank is mutually concordant with delivery port, in described settling tank, erect and have multiple grids that are interspersed, opening is formed on grid and settling tank top or bottom, and adjacent apertures is staggered up and down.
12. is as claimed in claim 1 based on biodegradable oxirane exhaust treatment system, it is characterized in that, in described filtering ponds, adopt baton round as filtrate, it adopts the baton round of diameter 100～150mm at the bottom of pond, adopts the baton round of diameter 25～50mm at Chi Ding; Also be provided with multiple padding layer as filter screen at the middle part of filtering ponds, padding layer is provided with cellular ponding plastics orifice plate.
13. is as claimed in claim 1 based on biodegradable oxirane exhaust treatment system, it is characterized in that, the pool wall of described filtering ponds adopts masonry concrete framework, at the bottom of pond, 15～20% of cross-sectional area adopt perforation concrete plate arrange and form, and between perforation concrete plate is adjacent, spacing 1～10cm is parallel evenly arranges.
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| CN201320837966.1U CN203737104U (en) | 2013-12-17 | 2013-12-17 | Ethylene oxide waste gas treatment system based on biodegradation |
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| CN201320837966.1U CN203737104U (en) | 2013-12-17 | 2013-12-17 | Ethylene oxide waste gas treatment system based on biodegradation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108580543A (en) * | 2018-06-28 | 2018-09-28 | 四川省天晟源环保股份有限公司 | A kind of new-type mortar reactor and its operating method for soil remediation |
| CN110559840A (en) * | 2019-09-19 | 2019-12-13 | 清远市益源环保科技有限公司 | method and equipment for treating stink and VOCs (volatile organic compounds) through microorganisms |
| CN110732237A (en) * | 2019-09-26 | 2020-01-31 | 威海百克环保工程有限公司 | VOC treatment system and technology for PTA sewage pretreatment working section |
| WO2021085388A1 (en) * | 2019-10-30 | 2021-05-06 | テルモ株式会社 | Exhaust gas decomposition system, exhaust gas decomposition method, and organic compound production method |
-
2013
- 2013-12-17 CN CN201320837966.1U patent/CN203737104U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108580543A (en) * | 2018-06-28 | 2018-09-28 | 四川省天晟源环保股份有限公司 | A kind of new-type mortar reactor and its operating method for soil remediation |
| CN110559840A (en) * | 2019-09-19 | 2019-12-13 | 清远市益源环保科技有限公司 | method and equipment for treating stink and VOCs (volatile organic compounds) through microorganisms |
| CN110732237A (en) * | 2019-09-26 | 2020-01-31 | 威海百克环保工程有限公司 | VOC treatment system and technology for PTA sewage pretreatment working section |
| WO2021085388A1 (en) * | 2019-10-30 | 2021-05-06 | テルモ株式会社 | Exhaust gas decomposition system, exhaust gas decomposition method, and organic compound production method |
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