CN103232138B - 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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- CN103232138B CN103232138B CN201310145774.9A CN201310145774A CN103232138B CN 103232138 B CN103232138 B CN 103232138B CN 201310145774 A CN201310145774 A CN 201310145774A CN 103232138 B CN103232138 B CN 103232138B
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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 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 severe poisonous chemicals, there is very strong carcinogenic and mutagenicity, mankind's absorption for a long time can cause the 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 is often accompanied by explosive factory, Organic Chemical Plant or plastics manufactory raw sewerage and is discharged in environment water.The annual oil of mirbane output of China surpasses 800,000 t, and a factory that produces oil of mirbane 4000t per year, approximately discharges nitrobenzene waste water 15t every day, and the whole world approximately has the oil of mirbane that surpasses 10,000 t to enter into surrounding medium by different approaches every year.In China's industrial discharge waste water standard (GB8978-1996) and surface water environment standard (GB3838-2002), p-nitrophenyl ambient quality standard have strict regulation, 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 day by day receive people's concern.
Nitrobenzene waste water treatment technology development is both at home and abroad maked rapid progress, and mainly contains Physical, chemical method, biological process and compounding method.Physical treatment method mainly contains vaporizing extract process, extraction process, absorption method and membrane separation technique etc. at present, the advantage of Physical treatment of Nitrobenzene waste water maximum is that treatment process is relatively simple, can realize the recycling of pollutent, but there is long processing period, use sorbent material poor stability in the method, and has the unsettled problem of the rate of recovery.Compare with Physical, it is fast that chemical Treatment nitrobenzene waste water has speed of reaction, the feature of successful, therefore the parent who is subject 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 chemical treating process, its processing cost is very high and also can cause the serious problems such as secondary pollution because of chemical reagent improper use.Biological process refers to that oil of mirbane in nitrobenzene waste water, under the effect of microorganism, is thoroughly decomposed, and can not cause secondary pollution to environment, and microorganism have stronger can variability and adaptability, safeguard simple, the advantage that running cost is low.But the degradation capability of most microorganism p-nitrophenyls is less than 500mg/L, surpass this scope, will cause microorganism to be poisoned death.Therefore particularly for the nitrobenzene waste water of low concentration (≤500mg/L), conventional physical chemical treatment mode all exists that treatment rate is low, cost is high and has the problem of secondary pollution, seeks a kind of efficient Ecological Disposal mode very crucial.
Constructed wetland waste water treatment technology is a kind of ecological sewage purification techniques with controllability and through engineering approaches feature that is artificially designed and built by simulating nature wetland that 20 century 70s grow up, and the feature such as this technology is low with its less investment, construction operation cost, good purification has been subject to extensive concern in recent years.Its application, gradually by the processing of conventional sanitary sewage, expands to the processing of the 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 worked in coordination with by physics, chemistry and biological action with matrix, plant and microorganism.
Tradition horizontal drowned flow artificial wet land is in application process, wetland bed body is for a long time in submerged condition, and wetland bed body surface reveals poor oxygen ambient level, yet oil of mirbane is under the condition of anaerobism, easily be reduced to the aniline of toxicity than low 50 times own, and aniline is easier to aerobic degradable; Simultaneously, in factory's discharge nitrobenzene waste water, organism majority exists with the larger molecular organics of difficult degradation, and root system can be secreted organism in wetland plant process of growth, can in the reduction compared with in the horizontal drowned flow artificial wet land of anaerobism, provide sufficient carbon source for oil of mirbane.Tidal flow artificial wetland is a kind of novel artificial swamp pattern, its principle is to utilize 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 good oxygen environment, the oil of mirbane and the aniline that are adsorbed in matrix obtain sufficient oxidation removal at emptying aerobic stage.Simultaneously, there is the dispose procedure of ammonia nitrogen in the biodegradable process of oxygen consumption of oil of mirbane and aniline, nitration reaction strong in tidal flow artificial wetland can generate a large amount of nitrate, thereby affect system effluent quality, by effluent recycling, to horizontal drowned flow artificial wet land, there is denitrification and fully removed in the organism that nitric nitrogen can make full use of wetland plant secretion in the environment of anaerobism.
Summary of the invention
The horizontal drowned flow artificial wet land of system pretreatment unit adopts continuous water intake mode, makes the Wetland Substrate state in flooding for a long time, and bed body presents the comparatively state of anaerobism.Simultaneously, filter out biomass is large, 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 as wetland plant, the organism that utilizes root system in its process of growth to discharge, for nitrobenzene reduction for toxicity is poor and the aniline of more suitable aerobic degradation and system recycling effluent in the denitrification of nitrate remove suitable anaerobic condition and sufficient carbon source be provided.
The tidal flow artificial wetland of system 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: the intermittently quantitative water inlet device of inflow deflecting funnel formula that horizontal subsurface flow wetland water outlet is continuous, realize the quantitative water inlet of continuous gradation, tidal flow artificial wetland top adopts uniform fine sand as matrix simultaneously, its void volume 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 uniform 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 space.Simultaneously, in tidal flow artificial wetland bottom, select the good zeolite of absorption property, boiler ash sediment, vermiculite or haydite as Wetland Substrate, make the residual oil of mirbane in waterflooding operation phase nitrobenzene waste water and the aniline that is reduced in a large number can farthest be adsorbed on Wetland Substrate.The emptying reoxygenation stage: during when saturated surface rises to wetland bed body end face, non-power siphon drainage pipe, by water in bed body is emptying in the time extremely short, makes saturated surface come back to a body bottom in waterflooding absorption phase.In the process that water is discharged from when saturated surface declines, due to matrix interstitial water suction, oxygen in atmosphere is sucked rapidly in a body, increase oxygen transmission quantity and the utilization ratio of bed body, and then greatly improve the oil of mirbane that adsorbs in Wetland Substrate and the oxidation removal effect of aniline.
System water outlet place arranges automatic average shunt regulating and reflux, water outlet is divided into water outlet two portions of equivalent voluntarily by automatic average parallel regulator, wherein a part is by automatic back flow pipe, utilize physical features to complete voluntarily 1/2 effluent recycling to settling tank, thereby again enter horizontal drowned flow artificial wet land, process, improve the denitrification removal that nitrobenzene waste water is processed rear nitrate.
The 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 inhalant region 4, wetland plant 5, horizontal drowned flow artificial wet land anaerobic bed 6, horizontal drowned flow artificial wet land drained zone 7, horizontal drowned flow artificial wet land water outlet 8, the intermittently quantitative water inlet device 9 of deflecting funnel formula, tidal flow artificial wetland fine sand layer 10, tidal flow artificial wetland aerobic bed 11, automatic average parallel regulator 12, automatic back flow pipe 13, siphon drainage pipe 14 etc.Low concentration (≤500mg/L) nitrobenzene waste water and system recycling effluent are continuously pumped into horizontal drowned flow artificial wet land inhalant region 4 by water pump 3 after mixing in settling tank 2, make horizontal drowned flow artificial wet land anaerobic bed 6 present for a long time the comparatively state of anaerobism.Meanwhile, the carbon source that the nitrate in oil of mirbane and recycling effluent utilizes wetland plant 5 to discharge is removed efficiently in anaerobic environment.The intermittently quantitative water inlet device 9 of deflecting funnel formula consists of asymmetric funnel-shaped container, by hinge, be connected with tidal flow artificial wetland device, two ends arrange stop bit point, make its standard state in horizontality, after holding full water, can take hinge because of gravity unbalance topples over as axial tidal flow artificial wetland, water is got back to equilibrium theory of tide again voluntarily after flowing out completely, reciprocation cycle, realize the quantitative water inlet of continuous gradation, the void volume 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 uniform distributes, with the good zeolite of absorption property in tidal flow artificial wetland aerobic bed 11, boiler ash sediment, vermiculite or haydite Wetland Substrate fully contact.When tidal flow artificial wetland liquid level is increased to behind top gradually, by siphon drainage pipe 14, discharge tide current is wetland bed rapidly for sewage, and at water port process automatic average parallel regulator 12, smooth rotor by a rotation makes water outlet be divided into voluntarily two portions of equivalent, wherein a part, by automatic back flow pipe 13, utilizes physical features to complete voluntarily 1/2 effluent recycling to settling tank 2.
Compared with prior art, beneficial effect of the present invention is:
(1) in the present invention, the feature according to the stronger oil of mirbane of horizontal drowned flow artificial wet land and nitrate removal ability and tidal flow artificial wetland with higher pollutant oxidation effect, according to 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 first reduction rear oxidation the backflow removal nitrate of oil of mirbane, create condition, can realize the efficient Ecological Disposal of low concentration (≤500mg/L) nitrobenzene waste water.
(2), in the present invention, in horizontal drowned flow artificial wet land, select biomass is large, 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 as wetland plant 5.First, the durability against pollution that wetland plant is stronger can cushion the toxic action of oil of mirbane to wetland bed body microorganism and plant; In addition, the nitrate in oil of mirbane and recycling effluent can make full use of the organism that wetland plant discharges at process of growth root, as the carbon source of reduction reaction and denitrification.
(3) in the present invention, the operation of tidal flow artificial wetland bed has adopted non-power automatic feeding water and water-freeing arrangement, and it adopts the intermittently quantitative water inlet device 9 of deflecting funnel formula and siphon drainage 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 Substrate, 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) in the present invention, in tidal flow artificial wetland, filter out zeolite, boiler ash sediment, vermiculite or haydite that adsorptive power is stronger as the bottom substrates of tidal flow artificial wetland aerobic bed 11, the adsorptive power of the pollutent such as p-nitrophenyl and aniline in intensive treatment process, can significantly increase the pollutant removal in emptying reoxygenation stage.
(5) in the present invention, in system water outlet place, automatic average parallel regulator 12 and automatic back flow pipe 13 are set, water outlet automatic average can be divided into two portions of equivalent, wherein a part can flow into refluxing opening voluntarily, utilizes physical features to complete voluntarily 1/2 effluent recycling to settling tank.
Accompanying drawing explanation:
Fig. 1 is the schematic 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 inhalant regions,
5 wetland plants, 6 horizontal drowned flow artificial wet land anaerobic beds,
7 horizontal drowned flow artificial wet land drained zones, 8 horizontal drowned flow artificial wet land water outlets,
The intermittently quantitative water inlet device of 9 deflecting funnel formulas, 10 tidal flow artificial wetland fine sand layers,
11 tidal flow artificial wetland aerobic beds, 12 automatic average parallel regulators,
13 automatic back flow pipes, 14 siphon drainage pipes.
Embodiment:
Below in conjunction with accompanying drawing and mark, further describe the present invention.
After low concentration (≤500mg/L) nitrobenzene waste water mixes in settling tank 2 by water inlet pipe 1 and system recycling effluent, by water pump 3, be continuously pumped into horizontal drowned flow artificial wet land inhalant region 4, make horizontal drowned flow artificial wet land bed for a long time in submerged condition, therefore present the comparatively environment of anaerobism.Wastewater streams is through horizontal drowned flow artificial wet land anaerobic bed body 6, the organism that nitrate in oil of mirbane and recycling effluent utilizes wetland plant 5 roots secretions is as carbon source and the environment of anaerobism comparatively, realizes nitrobenzene reduction and be toxicity lower and the aniline of more oxidizable removal and the removal of the denitrification of nitrate.The intermittently quantitative water inlet device 9 of inflow deflecting funnel formula that horizontal drowned flow artificial wet land water outlet is continuous, realize the quantitative water inlet process of continuous gradation, and the void volume 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 uniform distributes, fully contact and adsorb with the good zeolite of absorption property, boiler ash sediment, vermiculite or haydite Wetland Substrate in tidal flow artificial wetland aerobic bed 11.
When tidal flow artificial wetland liquid level is increased to behind top gradually, by siphon drainage pipe 14, discharge tide current is wetland bed rapidly for sewage, atmosphericoxygen can, because negative pressure sucks rapidly morning and evening tides artificial swamp aerobic bed 11 by tidal flow artificial wetland bed surface, make the pollutent of absorption that sufficient oxidation removal occur.Can be through automatic average parallel regulator 12 in tidal flow artificial wetland exiting water process, by a rotatable smooth rotor, make water outlet be divided into voluntarily two portions of equivalent, wherein a part is by automatic back flow pipe 13, utilize physical features to complete voluntarily 1/2 effluent recycling to settling tank, thereby can again enter horizontal drowned flow artificial wet land, process, improve the denitrification removal that nitrobenzene waste water is processed rear nitrate.
Claims (7)
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 the intermittently quantitative water inlet device (9) of deflecting funnel formula 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) by the water inlet pipe that is provided with water pump (3), be connected with settling tank (2) and its on kind be implanted with wetland plant (5), tidal flow artificial wetland aerobic bed (11) consists of top tidal flow artificial wetland fine sand layer (10) and the good hypothallus of bottom absorption property, and water outlet place is provided with siphon drainage pipe (14), siphon drainage pipe (14) outlet is connected with settling tank with automatic back flow pipe (13) by automatic average parallel regulator (12).
2. the system as claimed in claim 1, is characterized in that: in described horizontal drowned flow artificial wet land anaerobic bed body (6), select biomass is large, durability against pollution is strong, root system is in great numbers and growth velocity is high Medulla Junci, reed, cattail, calamus or Herba Cyperi Glomerati as wetland plant (5).
3. the system as claimed in claim 1, is characterized in that: described tidal flow artificial wetland aerobic bed (11) has adopted non-the power intermittently quantitative water inlet device (9) of deflecting funnel formula and the siphon drainage pipe (14) of operation automatically.
4. the system as claimed in claim 1, is characterized in that: described tidal flow artificial wetland aerobic bed (11) bottom selects zeolite, boiler ash sediment, vermiculite or haydite that adsorptive power is stronger as matrix.
5. 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.
6. the system as claimed in claim 1, is characterized in that: described siphon drainage pipe (14) is provided with automatic average parallel regulator (12).
7. the system as claimed in claim 1, is characterized in that: described automatic average parallel regulator (12) utilizes physical features that automatic back flow pipe (13) is set to be connected with settling tank (2).
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| CN201310145774.9A CN103232138B (en) | 2013-04-24 | 2013-04-24 | Combined constructed wetland treatment method and system for nitrobenzene wastewater |
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| CN104150703B (en) * | 2014-07-25 | 2015-10-28 | 中国环境科学研究院 | A kind of A/O type wetland Treated sewage reusing device and sewage water treatment method |
| 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 |
| 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 |
| 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 |
| 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 |
| CN111470631A (en) * | 2020-05-20 | 2020-07-31 | 兰州交通大学 | Constructed wetland system and method for tail water treatment of sewage treatment plant |
| CN111777263B (en) * | 2020-06-05 | 2021-03-30 | 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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| SE456500B (en) * | 1985-09-16 | 1988-10-10 | Boliden Ab | PROCEDURE FOR CLEANING THE WATER FOR ELIMINATION OF NITROGEN |
| CN101671092B (en) * | 2009-10-12 | 2011-05-18 | 中国农业大学 | Sewage treatment system and method for combined tidal flow artificial wetland |
| CN102001793B (en) * | 2010-11-30 | 2012-11-21 | 中国环境科学研究院 | Method and system for treating sewage of tidal flow and horizontal subsurface flow combined wetland |
| CN102923860A (en) * | 2012-11-26 | 2013-02-13 | 中国农业大学 | Method for enhanced nitrogen removal of tidal flow-horizontal subsurface flow hybrid constructed wetland and system thereof |
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