CN104318335A - Method for optimizing and assessing riverway waste water ecological purification scheme - Google Patents
Method for optimizing and assessing riverway waste water ecological purification scheme Download PDFInfo
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- 238000000746 purification Methods 0.000 title claims abstract description 48
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 229910052757 nitrogen Inorganic materials 0.000 description 9
- 125000001477 organic nitrogen group Chemical group 0.000 description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- 230000007062 hydrolysis Effects 0.000 description 6
- 238000006460 hydrolysis reaction Methods 0.000 description 6
- 244000025254 Cannabis sativa Species 0.000 description 4
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- 235000016791 Nymphaea odorata subsp odorata Nutrition 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
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- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000013401 experimental design Methods 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
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- 238000012827 research and development Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000195493 Cryptophyta Species 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 238000007813 chromatographic assay Methods 0.000 description 1
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Abstract
The invention discloses a method for optimizing and assessing a riverway waste water ecological purification scheme, and belongs to the field of water pollution control. The method comprises the steps that firstly, the riverway water power and the water quality are simulated through a QUAL2K model, and model parameters are calibrated and verified; secondly, the field experiment is designed, and an emergent aquatic plant ecological processing unit, a floating-leaved plant ecological processing unit, a submerged plant ecological processing unit and a floating plant ecological processing unit are used for processing river water; thirdly, the degradation coefficients of the emergent aquatic plant ecological processing unit, the floating-leaved plant ecological processing unit, the submerged plant ecological processing unit and the floating plant ecological processing unit are worked out by ecologically processing the field experiment data; fourthly, the emergent aquatic plant ecological processing unit, the floating-leaved plant ecological processing unit, the submerged plant ecological processing unit and the floating plant ecological processing unit are arranged and combined to form 24 ecological purification schemes, the degradation coefficients obtained through the field experiment are adopted, and the 24 different ecological purification schemes are simulated through the QUAL2K model; fifthly, the tail end water outlet pollutant removing rates of the various schemes are calculated, and the optimal ecological purification scheme is obtained through the comprehensive assessment of the analytic hierarchy process. By means of the method, the problem of optimal selection of the ecological purification schemes can be effectively solved, and the decision support is provided for the environment management department.
Description
Technical field
The present invention relates to the optimization evaluation method of river sewage ecological purification scheme, specifically a kind of modeling method that utilizes is optimized the method for assessment to river sewage ecological purification scheme.
Background technology
Sewage disposal technology is mainly divided into physics, chemistry and ecological three classes.In the past few decades, physics, chemical method are at home and abroad widely used, and achieve good effects of purification quality.Although physical method process equipment is simple, be easy to operation, treatment effect is fairly obvious, often cures the symptoms, not the disease; Although chemical method has simple to operate, the advantage that consumption is few, administer instant effect, generally as emergency plan, cost is higher, easily causes secondary pollution.Therefore, ecological treatment method is greatly paid close attention to and widespread use in recent years.
The Ecological Disposal of sewage relies on the basic physical features of water, soil, bacterium, higher plant and sunlight, utilize the self regulating and control mechanism of soil-microorganism-botanical system and comprehensive self-purification capacity, complete the advanced treating of sewage, simultaneously by moisture in sewage and nutraceutical comprehensive utilization, realize the innoxious and resource recycling of tail water.Ecological wastewater processing is widely used in raw sewage, river sewage, or Tailwater Depth the two stage treatment even research and practice of tertiary treatment.The eco-treatment technology of sewage is a kind of wastewater processing technology that developed recently gets up, and has the advantages that effluent quality is good, small investment, structure are simple, operational administrative is convenient and operating cost is low.
In 20 end of the centurys, Chinese scholars begins one's study the comprehensive assessment of sewage disposal technology, and its method mainly comprises analytical hierarchy process evaluation, Grey System Appraisal, fuzzy overall evaluation, the evaluation of benefit evaluation exponential model.In recent years, foreign scholar carried out comprehensive, multi-angle, many-side, quantification evaluation study with regard to ecological environment problem.The domestic comprehensive evaluation theory for wastewater treatment efficiency and applied research are adopt analytical hierarchy process and fuzzy overall evaluation mostly.These researchs are all postevaluations for wastewater treatment efficiency, have ignored sewage treatment project implement before assessment, in environmental management practice, lack practicality and perspective.
Current eco-treatment technology assesses the assessment mainly for single-item handling technology or a certain processing scheme effect, have ignored the optimized evaluation before sewage treatment project enforcement, and not yet have report at present for the quantitative optimization evaluation studies of sewage ecological purification scheme.Therefore, need badly and invent practical sewage ecological purification technical scheme quantitative optimization appraisal procedure reliably, for the optimum choice of sewage ecological purification scheme and recruitment evaluation provide foundation.In recent years, the one-dimensional river water quality model QUAL2K model of EPA's research and development is widely used in river, quality in watershed simulation and forecast, this model more comprehensively can reflect the Transport And Transformation of nitrogen in sewage, phosphorus, microorganism, algae, accurately can reflect the water quality Hydrodynamic Process of sewage.Therefore, the present invention adopts QUAL2K model, is optimized assessment to river sewage ecological purification technical scheme, provides a kind of new thinking and appraisal procedure for environmental management department water prevention and cure of pollution.
Summary of the invention
1. invent the technical matters that will solve
The object of this invention is to provide a kind of modeling method that utilizes and the method for assessment is optimized to river sewage ecological purification scheme.Water quality model is adopted to simulate the various ecological purification schemes of multiple Ecological Disposal unit permutation and combination, effect optimal case is filtered out by chromatographic assays comprehensive assessment, for environmental management department provides decision support, the method effectively can solve the problem that ecological rivers and lakes scheme optimization is selected.
2. technical scheme
A method for optimized evaluation river sewage ecological purification scheme, the steps include: (1) application QUAL2K modeling urban river water power and water quality, carries out calibrating and verify model parameter; (2) design field experiment, adopt emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four Ecological Disposal unit to process river respectively; (3) by Ecological Disposal field experiment data, the degradation coefficient of emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four Ecological Disposal unit is calculated; (4) be 24 kinds of ecological purification schemes by emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four unit permutation and combination, adopt the degradation coefficient that field experiment obtains, by the ecological purification scheme that QUAL2K modeling 24 kinds is different; (5) calculate the pollutants removal rate of various scheme outlet water at tail end, adopt analytical hierarchy process comprehensive assessment to obtain optimum ecological purification scheme.By utilization of the present invention, the problem that ecological purification scheme optimization is selected effectively can be solved, for environmental management department provides decision support.
1) by on-site inspection and Data acquisition, complete the data needed for river course simulation, comprise river width, the river course degree of depth, flow velocity, flow hydrodynamic force hydrographic data, chemical oxygen demand (COD) (COD), nitre nitrogen (NO
3-N), ammonia nitrogen (NH
3-N), total nitrogen (TN), total phosphorus (TP) water quality data, point source, pollution of area source source data, the hydrodynamic force in application QUAL2K modeling tail water river course and water quality data, and be analyzed with measured data, carry out calibration and the checking of river model parameter.
2) design field experiment, adopt emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four Ecological Disposal unit to process river respectively.Experimental establishment is little in temperature Change, plant growth is vigorous, microbial growth spring and summer season faster.Water flow in Control release device, flow velocity are identical with river course, and after sampling, scene is monitored each unit water-in and water-out water quality.
3) by Ecological Disposal field experiment, 4 unit are obtained to COD, NO
3-N, NH
3the result data of-N, Phos, organic nitrogen, organophosphorus, adopt first order kinetics reactional equation to calculate the degradation coefficient of each Ecological Disposal unit to water-quality guideline main in sewage, comprise COD oxidation rate, the anti-digestion rate of nitre nitrogen, Ammonia Nitrification speed, Phos absorption rate, organic nitrogen hydrolysis rate, organophosphorus hydrolysis rate.Because experimental water is the water intaking of polluted river channel scene, experimental design flow velocity is consistent with flow velocity of river, and therefore water quality condition is identical, hydrodynamic force situation is similar, and it is reliably rationally that the parameter calculated is applied to the simulation of river channel ecology purification techniques.
First order kinetics reactional equation, i.e. C=C
0e
-Kt, can degradation coefficient K=t be obtained by formula
-1lnC
0/ C, in formula: t is the reaction time, d; K is ammonia nitrogen degradation coefficient, 1/d; C is the pollutant levels that t measures, mg/L; C
0for the initial concentration of pollutant, mg/L.
4) degradation coefficient of different units is set in different section, different Ecological Disposal unit can be simulated to the purification process of sewage.River course is divided into 4 sections, corresponding section in the degradation coefficient of each Ecological Disposal unit input water quality model, the various different scheme of representative simulation.Emergent aquactic plant, floatingleaved plant, submerged plant, pleuston can permutation and combination be 24 kinds of ecological purification schemes.Set the main water quality parameter in each section according to the degradation coefficient that field experiment obtains, adopt the 24 kinds of ecological purification scheme enforcements respectively in river course of QUAL2K modeling.QUAL2K model is comprehensive, a diversified Stream Water Quality Models of EPA's research and development, is applicable to simulate the dendritic water quality of river mixed completely.
5) calculate the clearance of various scheme to main water-quality guideline by analog result, adopt COD, NO
3-N, NH
3the main water-quality guideline of-N, Phos, organic nitrogen, organophosphorus sets up ecological purification scheme works evaluation index system, then adopt ratio scale method to calculate the weight coefficient of each water quality factor, obtain optimum ecological purification scheme finally by analytical hierarchy process comprehensive assessment.
Analytical hierarchy process refers to a complicated decision-making problem of multi-objective as a system, be multiple target or criterion by goal decomposition, and then be decomposed into some levels of multi objective, Mode of Level Simple Sequence (flexible strategy) and total sequence is calculated, using the systems approach as target (multi objective), multi-scheme Optimal Decision-making by qualitative index Fuzzy Quantifying.Ratio scale method is mainly used in the quality difference that people estimate things, generally can show well with 5 kinds of differentiations, when needing higher precision, can also make between adjacent differentiation and comparing, thus form 9 kinds of differentiations, quantifying is exactly 9 scales.
According to ratio scale method, obtain the preferred matrix of paired multilevel iudge of various index, calculate initial weight coefficient, then normalized weight coefficient.Normalized weight coefficient is substituted into comprehensive evaluation formula A
i=W
1r
1+ W
2r2+ ... + W
mr
m(i=1,2......24, m=1,2......), obtains the comprehensive evaluation index value of each scheme pollutant removal.Wherein: A
ibe i-th scheme pollutant removal comprehensive evaluation index value, m is water quality factor number, and R is sub each water quality factor clearance, and W is each water quality factor weight coefficient.
3. beneficial effect of the present invention
By utilization of the present invention, effect optimal case can be obtained in numerous assembled schemes of multiple ecological purification technology, the problem that effective solution ecological purification scheme optimization is selected, environmental management department decision references is provided, the design proposal avoiding poor effect maybe can not reach re-set target is implemented, save human and material resources, financial resources, society, economy, environmental benefit are maximized.
Accompanying drawing explanation
Fig. 1-techniqueflow block diagram of the present invention.
Fig. 2-Ecological Disposal field experiment design diagram, wherein 1 representative water inlet, 2 represent emergent aquactic plant, and 3 represent floatingleaved plant, and 4 represent submerged plant, and 5 represent pleuston, and 6 represent water outlet.
Embodiment
For Taihu Lake basin Guan Lin sewage treatment plant, application the inventive method has carried out the optimized evaluation of ecological purification scheme to water outlet river course tail water.Guan Lin town sewage treatment plant is positioned at manufacturing district, side, long-pending plum Hebei, and water outlet flows through the water outlet river course inflow Gehu lake tributary Meng Jinhe of 300 meters.The hydrodynamic force in application QUAL2K modeling water outlet river course and water quality, carry out parameter verification.
Fig. 2 is shown in the experimental design of official woods sewage treatment plant tail water design ecological purification.Floatingleaved plant circle coin grass, pleuston water lily, submerged plant watermifoil, emergent aquactic plant iris is adopted to process tail water respectively.Long 80 meters of each ecological purification unit, wide 20 meters, the depth of water 40cm of design, goes out flow and makes the hydraulic detention time of each unit be 1 day.First tail water enter water collecting basin, just in heavy rear inflow circle coin grass, water lily, watermifoil, iris four unit.The grass planting of circle coin, in long 20m, in the floating bed of wide 2m, places 8 perpendicular to water (flow) direction; Water lily is directly planted in ecological purification unit, and planting density is 1 strain/m
2watermifoil arranges that density is 0.3kg/m
3; Iris plant height scope is at 20-30em, and plantation transverse and longitudinal interval is 10em.
The influent concentration of monitoring by experiment and aqueous concentration, adopt first order kinetics reactional equation to calculate the main water quality degradation coefficient of each Ecological Disposal unit, comprise COD oxidation rate, the anti-digestion rate of nitre nitrogen, Ammonia Nitrification speed, Phos absorption rate, organic nitrogen hydrolysis rate, organophosphorus hydrolysis rate.Be 24 kinds of schemes by circle coin grass, water lily, watermifoil, iris four unit permutation and combination.High-ranking military officer woods sewage disposal plant effluent river course is divided into four sections, every section of 75m.Set the main water quality parameter in each section according to the degradation coefficient that field experiment obtains, principal degradation coefficient is respectively COD oxidation rate, nitre nitrogen denitrification rate, Ammonia Nitrification speed, Phos absorption rate, organic nitrogen hydrolysis rate, organophosphorus hydrolysis rate.Adopt QUAL2K to simulate six kinds of ecological purification schemes, obtain the water-quality guideline aqueous concentration of each scheme.According to ecological purification program simulation result and river course outlet water at tail end concentration, calculate the clearance of the main water quality factor of each scheme.
Adopt COD, NO
3-N, NH
3-N, Phos, organic nitrogen, organophosphorus 6 water-quality guideline set up ecological purification scheme works evaluation index system.Adopt ratio scale method, calculate COD, NO
3-N, NH
3the weight coefficient of-N, Phos, organic nitrogen, organophosphorus is respectively 0.19,0.27,0.21,0.12,0.13,0.08.Weight coefficient is substituted into the pollutant removal evaluation number value that comprehensive evaluation formula obtains 24 kinds of schemes.Result shows, design successively pleuston, submerged plant, floatingleaved plant, emergent aquactic plant scheme best to tail water pollutant removal.
The above is only case study on implementation of the present invention, and be not restriction the present invention being made to other form, any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the Equivalent embodiments of equivalent variations.But everyly do not depart from technical solution of the present invention content, any simple modification, equivalent variations and the remodeling done above embodiment according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (5)
1. a method for optimized evaluation river sewage ecological purification scheme, the steps include: (1) application QUAL2K modeling urban river water power and water quality, carries out calibrating and verify model parameter; (2) design field experiment, adopt emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four Ecological Disposal unit to process river respectively; (3) by Ecological Disposal field experiment data, the degradation coefficient of emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four Ecological Disposal unit is calculated; (4) be 24 kinds of ecological purification schemes by emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four unit permutation and combination, adopt the degradation coefficient that field experiment obtains, by the ecological purification scheme that QUAL2K modeling 24 kinds is different; (5) calculate the pollutants removal rate of various scheme outlet water at tail end, adopt analytical hierarchy process comprehensive assessment to obtain optimum ecological purification scheme.
2. the method for a kind of optimized evaluation river sewage ecological purification scheme according to claim 1, it is characterized in that the degradation coefficient input water quality model field experiment of Ecological Disposal unit obtained, adopt the ecological purification scheme of each unit combination of QUAL2K modeling.
3. the method for a kind of optimized evaluation river sewage ecological purification scheme according to claim 1, it is characterized in that emergent aquactic plant, floatingleaved plant, submerged plant, pleuston four Ecological Disposal unit degradation coefficient by field experiment measured data calculate obtain.
4. the method for a kind of optimized evaluation river sewage ecological purification scheme according to claim 1, is characterized in that being optimized assessment by water quality model analogy method to ecological purification scheme.
5. the method for a kind of optimized evaluation river sewage ecological purification scheme according to claim 1, it is characterized in that the utilization by the method, effect optimal case can be obtained in numerous assembled schemes of multiple ecological purification technology, the problem that effective solution ecological purification scheme optimization is selected, for environmental management department provides decision support.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105279704A (en) * | 2015-09-25 | 2016-01-27 | 天津大学 | Method for forming regulation and control plan for response to emergency water pollution event in long-distance water transfer project |
| CN106396115A (en) * | 2016-11-07 | 2017-02-15 | 南大（常熟）研究院有限公司 | Highly efficient constructed wetland purification system for farmland tail water |
| CN111539580A (en) * | 2020-04-30 | 2020-08-14 | 上海市园林科学规划研究院 | Multi-scheme optimization method for urban greening ecological technology integration application |
| CN118235148A (en) * | 2023-09-12 | 2024-06-21 | 南京大学 | Reconstruction method and system of wastewater biological treatment process based on machine learning |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104077487A (en) * | 2014-07-04 | 2014-10-01 | 南京大学 | Method for simulating optimized water quality improvement scheme by virtue of water quality model |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104077487A (en) * | 2014-07-04 | 2014-10-01 | 南京大学 | Method for simulating optimized water quality improvement scheme by virtue of water quality model |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105279704A (en) * | 2015-09-25 | 2016-01-27 | 天津大学 | Method for forming regulation and control plan for response to emergency water pollution event in long-distance water transfer project |
| CN105279704B (en) * | 2015-09-25 | 2019-02-01 | 天津大学 | The regulation method for generating plan of long distance water transfer project reply burst water contamination accident |
| CN106396115A (en) * | 2016-11-07 | 2017-02-15 | 南大（常熟）研究院有限公司 | Highly efficient constructed wetland purification system for farmland tail water |
| CN111539580A (en) * | 2020-04-30 | 2020-08-14 | 上海市园林科学规划研究院 | Multi-scheme optimization method for urban greening ecological technology integration application |
| CN118235148A (en) * | 2023-09-12 | 2024-06-21 | 南京大学 | Reconstruction method and system of wastewater biological treatment process based on machine learning |
| WO2024159750A1 (en) * | 2023-09-12 | 2024-08-08 | 南京大学 | Biological wastewater treatment process reconstruction method and system based on machine learning |
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