CN103232138A - Combined constructed wetland treatment method and system for nitrobenzene wastewater - Google Patents
Combined constructed wetland treatment method and system for nitrobenzene wastewater Download PDFInfo
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- CN103232138A CN103232138A CN2013101457749A CN201310145774A CN103232138A CN 103232138 A CN103232138 A CN 103232138A CN 2013101457749 A CN2013101457749 A CN 2013101457749A CN 201310145774 A CN201310145774 A CN 201310145774A CN 103232138 A CN103232138 A CN 103232138A
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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
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Abstract
The invention belongs to the field of sewage treatment, and relates to a combined constructed wetland ecological treatment method and system for nitrobenzene wastewater. The system comprises a horizontal subsurface flow constructed wetland anaerobic bed (6), a tidal flow constructed wetland aerobic bed (11) and a deflection funnel type intermittent quantitative water feeder (9), wherein the anaerobic bed (6) is communicated with a precipitation tank (2) through a water inlet pipe provided with a water pump (3); wetland plants (5) are grown on the anaerobic bed (6); the aerobic bed (11) is composed of an upper tidal flow constructed wetland fine sand layer (10) and a lower high-adsorbability substrate layer; a siphon drainage pipe (14) is arranged at the water outlet of the aerobic bed (11); and the outlet of the siphon drainage pipe (14) is connected with the precipitation tank through an automatic flow-averaging regulator (12) and an automatic return pipe (13). The invention provides a horizontal subsurface flow-tidal flow combined constructed wetland ecological nitrobenzene treatment system according to the concept of complementary advantages.
Description
Technical field
The invention belongs to sewage treatment area, be specifically related to combinatorial artificial Wetland ecological treatment process and the system of nitrobenzene waste water.
Background technology
Oil of mirbane is a kind of important fine-chemical intermediate and industrial chemicals in the organic chemistry industry, and it can be in order to products such as synthol, medicine, agricultural chemicals, rubber, synthetic detergent, explosive and petrochemical compleies.But oil of mirbane is a kind of hypertoxic chemical, has very strong carcinogenic and mutagenicity, and human long-time absorption can cause diseases such as skin inflammation, anaemia, liver damage and neurasthenia, so oil of mirbane is classified as the environmental pollutant of preferential control by China.Oil of mirbane often is accompanied by explosive factory, Organic Chemical Plant or plastics manufactory raw sewerage and is discharged in the environment water.The annual oil of mirbane output of China surpasses 800,000 t, and every day is approximately discharged nitrobenzene waste water 15t by a factory that produces oil of mirbane 4000t per year, and the whole world is annual to have the oil of mirbane that surpasses 10,000 t to enter into surrounding medium by different approaches approximately.The p-nitrophenyl ambient quality standard have strict regulation in China's industrial discharge waste water standard (GB8978-1996) and the surface water environmental standard (GB3838-2002), are respectively 2mg/L and 0.017mg/L.But typification factory nitrobenzene waste water with by the equal severe overweight of water body concentration of nitrobenzene contamination, thereby make the processing of nitrobenzene waste water be subjected to people's attention day by day.
Nitrobenzene waste water treatment technology development is both at home and abroad maked rapid progress, and mainly contains physics method, chemical method, biological process and compounding method.The physical treatment method mainly contains vaporizing extract process, extraction process, absorption method and membrane separation technique etc. at present, physics method treatment of Nitrobenzene waste water biggest advantage is that treatment process is simpler relatively, can realize the recycling of pollutent, but there is long processing period in this method, uses the sorbent material poor stability, and has rate of recovery problem of unstable.Compare with the physics method, it is fast that the chemical Treatment nitrobenzene waste water has speed of reaction, the outstanding effect characteristics, therefore the parent who is subjected to numerous chemical plant looks at, chemical treatment method mainly contains Fenton reagent oxidation method, elemental metals reduction method, catalytic oxidation, electrochemical process, ultrasonication method etc. at present, but in the chemical treating process, its processing cost is very high and also can cause serious problems such as secondary pollution because of the chemical reagent improper use.Biological process refers to that oil of mirbane in the nitrobenzene waste water under action of microorganisms, is thoroughly decomposed, and can not cause secondary pollution to environment, but and microorganism have stronger variability and adaptability, safeguard simple, the advantage that running cost is low.But the degradation capability of most microorganism p-nitrophenyls surpasses this scope less than 500mg/L, will cause microorganism to be subjected to poison dead.Therefore particularly (≤500mg/L) nitrobenzene waste water, conventional physical chemical treatment mode exist all that treatment rate is low, cost is high and have secondary pollution problem, and it is very crucial to seek a kind of efficient Ecological Disposal mode at low concentration.
Constructed wetland waste water treatment technology is a kind of ecological sewage purification technology with controllability and through engineering approaches characteristics that artificially designs and build by the simulating nature wetland that grows up the seventies in 20th century, and characteristics such as this technology is low with its less investment, construction operation cost, good purification have been subjected to extensive concern in recent years.It is used gradually by the processing of conventional sanitary sewage, expands to the processing of various wastewater such as farmland storm runoff, food processing wastewater, acid wastewater in mine, livestock breeding wastewater, percolate and trade effluent.The purification of sewage in wet land system mainly finished by physics, chemistry and biological action are collaborative with matrix, plant and microorganism.
The tradition horizontal drowned flow artificial wet land is in application process, wetland bed body is in submerged condition for a long time, and wetland bed body surface reveals relatively poor oxygen ambient level, yet oil of mirbane is under the condition of anaerobism, be reduced to toxicity easily and hang down 50 times aniline than itself, and aniline is easier to aerobic degraded fully; Simultaneously, the organism majority exists with the larger molecular organics of difficult degradation in factory's discharging nitrobenzene waste water, and root system can be secreted organism in the wetland plant process of growth, can provide sufficient carbon source than the reduction in the horizontal drowned flow artificial wet land of anaerobism for oil of mirbane.Tidal flow artificial wetland is a kind of novel artificial swamp pattern, its principle is to utilize the morning and evening tides operation scheme, and by regulating water intake mode, flooding emptying ratio and substrate composition, utilize the space suction of the variation generation of bed body saturated surface that atmosphericoxygen is sucked, make a body surface reveal oxygen environment preferably, the oil of mirbane and the aniline that are adsorbed on the matrix obtain sufficient oxidation removal at the emptying aerobic stage.Simultaneously, there is the dispose procedure of ammonia nitrogen in the biodegradable process of the oxygen consumption of oil of mirbane and aniline, nitration reaction strong in tidal flow artificial wetland can generate a large amount of nitrate, thereby influence system's effluent quality, to horizontal drowned flow artificial wet land, denitrification takes place in the environment of anaerobism the organism that nitric nitrogen can take full advantage of wetland plant secretion is fully removed with effluent recycling.
Summary of the invention
The horizontal drowned flow artificial wet land of system's pretreatment unit adopts continuous water intake mode, makes wetland matrix be in the state that floods for a long time, and the bed body presents the comparatively state of anaerobism.Simultaneously, filter out biomass is big, durability against pollution is strong, root system is in great numbers and growth velocity is high Medulla Junci, reed, cattail, calamus and Herba Cyperi Glomerati etc. as wetland plant, the organism that utilizes root system in its process of growth to discharge, and the aniline of more suitable aerobic degradation relatively poor for toxicity for nitrobenzene reduction and the denitrification of the nitrate in system's recycling effluent are removed anaerobic condition and the sufficient carbon source that provides suitable.
The tidal flow artificial wetland of system's post-processing unit adopts the morning and evening tides operation scheme of " intermittently quantitatively water inlet-moment draining ", and each cycle of operation comprises waterflooding absorption and two automatic operation phase of emptying reoxygenation.Waterflooding absorption phase: inflow deflecting funnel formula quantitative water inlet at the intermittence device that the horizontal drowned flow wetland effluent is continuous, realize the quantitative water inlet of continuous gradation, the tidal flow artificial wetland top adopts uniform fine sand as matrix simultaneously, its voidage is with intermittently quantitatively water inlet device single water inlet volume is identical, can make each water inlet unsaturated seepage from top to bottom after wetland surface evenly distributes, sewage is fully contacted with root system of plant with the microbial film that bed body filling surface adheres to, and that improves bed body matrix effectively utilizes the space; Simultaneously, select absorption property for use zeolite, boiler ash sediment, vermiculite or haydite etc. make the residual oil of mirbane in the waterflooding operation phase nitrobenzene waste water and the aniline that is reduced in a large number can farthest be adsorbed on the wetland matrix as wetland matrix preferably in the tidal flow artificial wetland bottom.The emptying reoxygenation stage: during when saturated surface rises to wetland bed body end face, non-power automatic bailer will make saturated surface come back to a body bottom with the water emptying in the bed body in the extremely short time in the waterflooding absorption phase.In the process that water is discharged from when saturated surface descends, because matrix interstitial water suction, oxygen in the atmosphere is sucked rapidly in the body, increase oxygen transmission quantity and the utilization ratio of bed body, and then improve the oil of mirbane that adsorbs in the wetland matrix and the oxidation removal effect of aniline greatly.
System's water outlet place arranges automatic ration shunting and reflux, water outlet by the automatic average parallel regulator with water outlet two portions of div in par aeq voluntarily, wherein a part is passed through reflux voluntarily, utilize physical features to finish 1/2 effluent recycling voluntarily to settling tank, handle thereby enter horizontal drowned flow artificial wet land again, improve the denitrification removal that nitrobenzene waste water is handled back nitrate.
" horizontal drowned flow-tide current " combinatorial artificial Wetland ecological treatment system that realizes aforesaid method comprises water inlet pipe 1, settling tank 2, water pump 3, horizontal drowned flow artificial wet land catchment area 4, wetland plant 5, horizontal drowned flow artificial wet land anaerobic bed 6, horizontal drowned flow artificial wet land catchment area 7, horizontal drowned flow artificial wet land water outlet 8, deflecting funnel formula be quantitative water inlet device 9 intermittently, tidal flow artificial wetland fine sand layer 10, tidal flow artificial wetland aerobic bed 11, water outlet automatic average parallel regulator 12, the automatic return line 13 of tidal flow artificial wetland, siphon drainage pipe 14 etc.Low concentration (≤after 500mg/L) nitrobenzene waste water and system's recycling effluent mix, be continuously pumped into horizontal drowned flow artificial wet land catchment area 4 by water pump 3 in settling tank 2, make wetland bed body 6 present the comparatively state of anaerobism for a long time.Simultaneously, the nitrate in oil of mirbane and the recycling effluent utilizes the carbon source of wetland plant 5 releases to remove efficiently in anaerobic environment.Deflecting funnel formula intermittently quantitative water inlet device 9 is made of asymmetric funnel-shaped container, link to each other with the tidal flow artificial wetland device by hinge, two ends arrange the stop bit point, make its standard state be in horizontality, after holding full water, can be that axial tidal flow artificial wetland is toppled over hinge because of gravity unbalance, after flowing out fully, gets back in water the equilibrium theory of tide again voluntarily, reciprocation cycle, realize the quantitative water inlet of continuous gradation, the voidage of tidal flow artificial wetland fine sand layer 10 is with intermittently quantitatively water inlet device single water inlet volume is identical, can make each water inlet unsaturated seepage from top to bottom after wetland surface evenly distributes, with the zeolite preferably of absorption property in the tidal flow artificial wetland aerobic bed 11, boiler ash sediment, wetland such as vermiculite or haydite matrix fully contacts.After the tidal flow artificial wetland liquid level is increased to the top gradually, then the discharge tide current is wetland bed rapidly by rainbow siphon drainage pipe 14 for sewage, and at water port process automatic average parallel regulator 12, smooth rotor by a rotation makes water outlet two portions of div in par aeq voluntarily, wherein a part is by return line 13, utilizes physical features to finish 1/2 effluent recycling voluntarily to settling tank 2.
Compared with prior art, beneficial effect of the present invention is:
(1) among the present invention, have the characteristics of higher pollutant oxidation effect according to the stronger oil of mirbane of horizontal drowned flow artificial wet land and nitrate removal ability and tidal flow artificial wetland, Ecological Disposal theory according to a kind of mutual supplement with each other's advantages, designed " horizontal drowned flow-tide current " combinatorial artificial wet land system, for the reduction rear oxidation earlier of oil of mirbane and reflux and remove nitrate and created condition, can realize low concentration (≤500mg/L) the efficient Ecological Disposal of nitrobenzene waste water.
(2) among the present invention, in horizontal drowned flow artificial wet land, select for use biomass is big, durability against pollution is strong, root system is in great numbers and growth velocity is high Medulla Junci, reed, cattail, calamus and Herba Cyperi Glomerati etc. as wetland plant 5.At first, the durability against pollution that wetland plant is stronger can cushion oil of mirbane to the toxic action of wetland bed body microorganism and plant; In addition, the nitrate in oil of mirbane and the recycling effluent can take full advantage of the organism that wetland plant discharges at the process of growth root, as the carbon source of reduction reaction and denitrification.
(3) among the present invention, non-power water inlet and water-freeing arrangement have automatically been adopted in the operation of tidal flow artificial wetland bed, and it adopts deflecting funnel formula quantitative water inlet device 9 at intermittence and siphon rising pipe 14 to realize the morning and evening tides operation scheme of " intermittently quantitatively water inlet-moment draining ".Significantly improve the touch opportunity of sewage and wetland matrix, and improved the oxygen environment of constructed wetland bed body, thereby be conducive to the aerobic removal of oil of mirbane and reduzate aniline.
(4) among the present invention, filter out the stronger zeolite of adsorptive power, boiler ash sediment, vermiculite or haydite etc. in the tidal flow artificial wetland as the bottom substrates of tidal flow artificial wetland aerobic bed 11, the adsorptive power of pollutents such as p-nitrophenyl and aniline in the intensive treatment process can significantly increase the pollutant removal in emptying reoxygenation stage.
(5) among the present invention, in system's water outlet place automatic ration splitter 12 and automatic return line 13 are set, can be with two portions of water outlet automatic average div in par aeq, wherein a part can flow into refluxing opening voluntarily, utilizes physical features to finish 1/2 effluent recycling voluntarily to settling tank.
Description of drawings:
Fig. 1 is the synoptic diagram of the combinatorial artificial wet land treating system of nitrobenzene waste water of the present invention.
Reference numeral:
1 water inlet pipe, 2 settling tanks,
3 water pumps, 4 horizontal drowned flow artificial wet land catchment areas,
5 wetland plants, 6 horizontal drowned flow artificial wet land anaerobic beds,
7 horizontal drowned flow artificial wet land catchment areas, 8 horizontal drowned flow artificial wet land water outlets,
9 deflecting funnel formulas are quantitative water inlet device intermittently, 10 tidal flow artificial wetland fine sand layers,
11 tidal flow artificial wetland aerobic beds, 12 water outlet automatic average parallel regulators,
The automatic return line of 13 tidal flow artificial wetlands, 14 siphon drainage pipes.
Embodiment:
Below in conjunction with accompanying drawing and mark, further describe the present invention.
Low concentration (≤after 500mg/L) nitrobenzene waste water mixes in settling tank 2 by water inlet pipe 1 and system's recycling effluent, be continuously pumped into horizontal drowned flow artificial wet land catchment area 4 by water pump 3, make the horizontal drowned flow artificial wet land bed be in submerged condition for a long time, therefore present the comparatively environment of anaerobism.The waste water horizontal drowned flow artificial wet land anaerobic bed body 6 of flowing through, the organism that nitrate in oil of mirbane and the recycling effluent utilizes wetland plant 5 roots secretions realizes that as carbon source and the environment of anaerobism comparatively nitrobenzene reduction is lower and the aniline of easier oxidation removal and the denitrification removal of nitrate of toxicity.Inflow deflecting funnel formula quantitative water inlet at the intermittence device 9 that the horizontal drowned flow artificial wet land water outlet is continuous, realize the quantitative water inlet process of continuous gradation, and the voidage of tidal flow artificial wetland fine sand layer 10 is with intermittently quantitatively water inlet device single water inlet volume is identical, can make each water inlet unsaturated seepage from top to bottom after tide current wetland surface evenly distributes, with absorption property in the tidal flow artificial wetland aerobic bed 11 preferably wetland matrix such as zeolite, boiler ash sediment, vermiculite or haydite fully contact and adsorb.
After the tidal flow artificial wetland liquid level is increased to the top gradually, then the discharge tide current is wetland bed rapidly by siphon drainage pipe 14 for sewage, atmosphericoxygen can make adsorbed contaminants that sufficient oxidation removal take place because negative pressure sucks morning and evening tides artificial swamp aerobic bed 11 rapidly by tidal flow artificial wetland bed surface.Can be through automatic average parallel regulator 12 in the tidal flow artificial wetland exiting water process, make water outlet two portions of div in par aeq voluntarily by a rotatable smooth rotor, wherein a part is passed through return line 13 voluntarily, utilize physical features to finish 1/2 effluent recycling voluntarily to settling tank, handle thereby can enter horizontal drowned flow artificial wet land again, improve the denitrification removal that nitrobenzene waste water is handled back nitrate.
Claims (8)
1. the combinatorial artificial Wetland ecological treatment system of nitrobenzene waste water, it is characterized in that: this system comprises horizontal drowned flow artificial wet land anaerobic bed (6), tidal flow artificial wetland aerobic bed (11) and deflecting funnel formula quantitative water inlet at the intermittence device (9) that connects horizontal drowned flow artificial wet land anaerobic bed (6) and tidal flow artificial wetland aerobic bed (11), wherein horizontal drowned flow artificial wet land anaerobic bed (6) be connected with settling tank (2) by the water inlet pipe that is provided with water pump (3) and its on kind be implanted with wetland plant (5), tidal flow artificial wetland aerobic bed (11) by top tidal flow artificial wetland fine sand layer (10) and bottom absorption property preferably hypothallus constitute, and water outlet place is provided with siphon drainage pipe (14), and siphon drainage pipe (14) outlet is connected with settling tank with return line (13) voluntarily by automatic average parallel regulator (12).
2. the system as claimed in claim 1, it is characterized in that: described system proposes a kind of Ecological Disposal theory of mutual supplement with each other's advantages, designed " horizontal drowned flow-tide current " combinatorial artificial wet land system, for reduction rear oxidation earlier and the backflow removal nitrate of oil of mirbane have been created condition.
3. the system as claimed in claim 1 is characterized in that: select for use biomass is big, durability against pollution is strong, root system is in great numbers and growth velocity is high Medulla Junci, reed, cattail, calamus and Herba Cyperi Glomerati etc. as wetland plant (5) in the described horizontal drowned flow artificial wet land anaerobic bed body (6).
4. the system as claimed in claim 1 is characterized in that: deflecting funnel formula quantitative water inlet device (9) at intermittence and siphon rising pipe (14) that described tidal flow artificial wetland aerobic bed (11) has adopted non-power to move automatically.
5. the system as claimed in claim 1 is characterized in that: select for use the stronger zeolite of adsorptive power, boiler ash sediment, vermiculite or haydite etc. as matrix bottom the described tidal flow artificial wetland aerobic bed (11).
6. the system as claimed in claim 1 is characterized in that: described tidal flow artificial wetland aerobic bed (11) top arranges voidage and the deflecting funnel formula tidal flow artificial wetland fine sand layer (10) that intermittently quantitatively water inlet device (9) single water inlet volume is identical.
7. the system as claimed in claim 1, it is characterized in that: described siphon drainage pipe (14) is provided with automatic average parallel regulator (12).
8. the system as claimed in claim 1 is characterized in that: described automatic average parallel regulator (12) utilize physical features to arrange voluntarily return line (13) is connected with settling tank (2).
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Cited By (7)
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| CN104150703A (en) * | 2014-07-25 | 2014-11-19 | 中国环境科学研究院 | A/O wetland reclaimed water recovery device and sewage treatment method |
| CN104891653A (en) * | 2015-05-27 | 2015-09-09 | 福建洋屿环保科技股份有限公司 | Treatment method and treatment system for garbage leachate |
| CN108423946A (en) * | 2018-04-28 | 2018-08-21 | 中电建水环境治理技术有限公司 | A kind of artificial swamp of processing eutrophic water body |
| CN108439734A (en) * | 2018-06-12 | 2018-08-24 | 沈阳建筑大学 | A kind of strengthened denitrification artificial wet land system distributed rationally based on plant |
| CN110642411A (en) * | 2018-06-26 | 2020-01-03 | 宝山钢铁股份有限公司 | Method and system for removing total organic carbon and nitrate nitrogen in cation resin regeneration wastewater |
| CN111777263A (en) * | 2020-06-05 | 2020-10-16 | 成都工业学院 | Resourceful treatment method for aquaculture wastewater |
| CN114349164A (en) * | 2022-01-12 | 2022-04-15 | 武汉中科水生环境工程股份有限公司 | Deep denitrification subsurface flow constructed wetland system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104150703A (en) * | 2014-07-25 | 2014-11-19 | 中国环境科学研究院 | A/O wetland reclaimed water recovery device and sewage treatment method |
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| CN104891653B (en) * | 2015-05-27 | 2018-06-01 | 福建洋屿环保科技股份有限公司 | The processing method and processing system of a kind of landfill leachate |
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| CN108439734B (en) * | 2018-06-12 | 2021-06-04 | 河南景尚环保科技有限公司 | Enhanced denitrification constructed wetland system based on plant optimization configuration |
| CN110642411A (en) * | 2018-06-26 | 2020-01-03 | 宝山钢铁股份有限公司 | Method and system for removing total organic carbon and nitrate nitrogen in cation resin regeneration wastewater |
| CN110642411B (en) * | 2018-06-26 | 2021-11-16 | 宝山钢铁股份有限公司 | Method and system for removing total organic carbon and nitrate nitrogen in cation resin regeneration wastewater |
| CN111777263A (en) * | 2020-06-05 | 2020-10-16 | 成都工业学院 | Resourceful treatment method for aquaculture wastewater |
| CN114349164A (en) * | 2022-01-12 | 2022-04-15 | 武汉中科水生环境工程股份有限公司 | Deep denitrification subsurface flow constructed wetland system |
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