CN104077487A - Method for simulating optimized water quality improvement scheme by virtue of water quality model - Google Patents
Method for simulating optimized water quality improvement scheme by virtue of water quality model Download PDFInfo
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Abstract
The invention discloses a method for simulating an optimized water quality improvement scheme by virtue of a water quality model, which belongs to the field of water pollution control. The method comprises the following steps of: (1) applying a QUAL2K model for simulating the power and the water quality of river water, and calibrating and verifying model parameters; (2) treating the river water at the side of a river by three water treatment technologies of an emergent aquatic plant floating bed, a submerged plant submerging bed and a biological rope; (3) calculating to obtain the degradation coefficients of the three water treatment technologies of emergent aquatic plant floating bed, submerged plant submerging bed and biological rope by virtue of water treatment field experimental data; (4) permuting and combining the three technologies of emergent aquatic plant floating bed, submerged plant submerging bed and biological rope into six water quality improvement schemes, and simulating six different water treatment technology combined schemes by the QUAL2K model by virtue of the degradation coefficients obtained by a field experiment; (5) calculating the load reduction rates of tail-end effluents of various schemes, and selecting the optimal combined scheme is selected by virtue of comprehensive evaluation adopting an analytic hierarchy process. The problem of water quality improvement scheme optimization selection can be effectively solved by virtue of the application of the method disclosed by the invention, and a decision support is provided for the environmental management department.
Description
Technical field
The present invention relates to the optimization system of selection of polluted river water correction scheme, specifically a kind of method of utilizing water quality model analogy method to be in optimized selection water correction scheme.
Background technology
Sewage disposal technology, according to the difference of handling principle, is divided into physical method, chemical method and ecological method three major types.In the past few decades, physics, chemical method are at home and abroad widely used, and have obtained good effects of purification quality.Although physical method process equipment is simple, easy operating, treatment effect is obvious, often cures the symptoms, not the disease; Although chemical method is simple to operate, consumption is few, administers instant effect, and 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.
Ecological treatment method is the very fast a kind of new technology of domestic and international development in recent years, the vital movement of the microorganism of the plant that its utilization is cultivated or cultivation, inoculation, water pollutant is shifted, transformed and degrades, thereby water body is purified, has advantages of that treatment effect is good, construction costs is relatively low, energy consumption is low, operating cost is cheap.Ecological Disposal method mainly comprises the bacterial classification method that adds, watercourse aeration method, biomembrance process, aquatic plant purification method, Artificial Wetland Techniques, biological floating bed.
20 end of the centurys, the begin one's study comprehensive evaluation of sewage disposal technology of Chinese scholars, its method mainly comprises: Grey System Appraisal, analytical hierarchy process evaluation, the evaluation of benefit evaluation exponential model, fuzzy overall evaluation and several different methods coupling application.In recent years, foreign scholar had carried out the evaluation study of many-side, multi-angle, comprehensive, quantification with regard to ecological environment problem.Scholar generally selects representative multinomial comprehensive assessment index from economical, society, three aspects of environment, determines the weight of indices, then adopt grey evaluation method to set up city sewage treatment works Integrated Evaluation Model according to analytical hierarchy process.The domestic comprehensive evaluation for wastewater treatment efficiency and application are to adopt analytical hierarchy process and fuzzy overall evaluation mostly, and are all the effect assessments after implementing for sewage treatment project, ignore the optimization selection evaluation before sewage treatment project is implemented, in environmental management practice, lacked practicality and perspective.
Current water treatment effect evaluation method is mainly the evaluation for single technology or a certain scheme treatment effect, or the comparison of multiple technologies treatment effect, ignore the optimization selection evaluation before sewage treatment project is implemented, and not yet had at present report for the optimization selection evaluation method of the different permutation and combination schemes of multiple technologies.Therefore, need the quantitative optimization selection evaluation method of the multiple technologies various combination scheme that invents practicability and effectiveness badly, the optimization selection evaluation that improves technical combinations scheme for water quality of river provides foundation.
In recent years, the one-dimensional river water quality model QUAL2K model of EPA's research and development is widely used in river, basin water quality simulation and forecast, QUAL2K model can more comprehensively reflect the Transport And Transformation of nitrogen in sewage, phosphorus, algae, microorganism, is accurately and reliably for the hydrodynamic force change of water quality process of simulating low-pollution water.Therefore, the present invention adopts QUAL2K model, water quality of river improvement scheme is simulated preferably, for the selection of environmental management department water pollution control scheme provides a kind of new method.
Summary of the invention
1. the technical matters that invention will solve
The object of this invention is to provide a kind of method of utilizing water quality model optimization to select water quality of river improvement scheme.Adopt the various water correction schemes of water quality model simulation multiple water treatment technology permutation and combination, filter out effect optimal case by chromatographic analysis method comprehensive evaluation, for environmental management department provides decision support, the method can effectively solve the problem that water correction scheme optimization is selected.
2. technical scheme
Utilize water quality model to simulate a method for preferred water correction scheme, the steps include: (1) application QUAL2K modeling river hydrodynamic force and water quality, model parameter is calibrated and checking; (2) adopt emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope to process respectively river on bank, river; (3), by water treatment field experiment data, calculate the degradation coefficient of emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope; (4) be six kinds of water correction schemes by emergent aquactic plant floating bed, submerged plant mattress, three kinds of technology permutation and combination of biological rope, the degradation coefficient that adopts field experiment to obtain, by six kinds of different water technology assembled schemes of QUAL2K modeling; (5) calculate the load reduction rate of various scheme outlet water at tail ends, adopt Analytical Hierarchy Process in Evaluation to choose Optimum combinational scheme.By utilization of the present invention, can effectively solve the problem that water correction scheme optimization is selected, for environmental management department provides decision support.
1) by on-site inspection and Data acquisition,, obtain the required hydrodynamic force water quality data of simulating river, comprise that flow, flow velocity, river width, river are dark, biochemical oxygen demand (BOD), ammonia nitrogen (NH
3-N), nitre nitrogen (NO
3-N), total nitrogen (TN), Phos, total phosphorus (TP).Hydrodynamic force and the water quality of application QUAL2K model to river is simulated, and is analyzed with measured data, carries out calibration and the checking of Stream Water Quality Models parameter.
2) adopt emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope to process respectively river on bank, river.Experimental provision adopts organic glass water tank, and experimental establishment is little in temperature Change, plant growth is vigorous, microbial growth spring and summer season faster.Emergent aquactic plant adopts vacuum plastic water surface floating bed to plant in organic glass water tank, and submerged plant is used plastic screen to be fixed in water tank, and biological rope transverse and longitudinal keeps at a certain distance away and hangs and be fixed in water tank.By the water flow in constant flow pump control experimental provision, make flow velocity identical with river mean flow rate, after sampling, monitor each technical unit water-in and water-out water quality at scene.
3), by water treatment field experiment, obtain 3 kinds of technology to BOD, NH
3-N, NO
3the result data of-N, organic nitrogen, organophosphorus, Phos, adopt first order kinetics reactional equation to calculate the degradation coefficient of each water technology to main water-quality guideline in sewage treatment plant tail water, comprise BOD oxidation rate, Ammonia Nitrification speed, the anti-digestion rate of nitre nitrogen, organic nitrogen hydrolysis rate, organophosphorus hydrolysis rate, Phos absorption rate.Because experimental water is the on-the-spot water intaking in river, experimental design flow velocity is consistent with river flow, and therefore water quality condition is identical, hydrodynamic force situation is similar, and it is reliably rationally that the parameter calculating is applied to river water technology simulation.
First order kinetics reactional equation, i.e. C=C
0e
-Kt, in formula: t is the reaction time, d; K is ammonia nitrogen degradation coefficient, 1/d; C is the pollutant levels of t chronometry, mg/L; C
0for the initial concentration of pollutant, mg/L.Can obtain degradation coefficient K=t by formula
-1lnC
0/ C.According to the natural logarithm of initial concentration and measurement result concentration ratio and time (my god) linear regression, obtain the equation of degrading, slope is degradation coefficient.
4) degradation coefficient of different technologies is set in different sections, the water technology that representative simulation is different.River is divided into 3 sections, corresponding section in the degradation coefficient of each water technology input water quality model, the various assembled scheme of representative simulation.Emergent aquactic plant floating bed, submerged plant mattress, biological rope can permutation and combination be 6 kinds of water correction schemes.The degradation coefficient obtaining according to field experiment is set the main water quality parameter in each section, adopts the enforcement in river respectively of 6 kinds of water correction schemes of QUAL2K modeling.
QUAL2K model is the latest edition of the QUAL series water quality model of EPA's research and development, is comprehensive, a diversified Stream Water Quality Models, is applicable to the dendritic water quality of river that simulation mixes completely.This model can be used for simulating the dendritic network of waterways, basin, and it both can be used as steady-state model, the dynamic model becoming also can be used as time.
5) calculate the load reduction rate of various schemes to main water-quality guideline by analog result, choose BOD, NH
3-N, NO
3-N, organic nitrogen, organophosphorus, the main water-quality guideline of Phos are set up water correction scheme recruitment evaluation index system, then adopt ratio scale method to calculate the weight coefficient of each water quality factor, finally choose optimum water correction scheme by Analytical Hierarchy Process in Evaluation.
Analytical hierarchy process is the method with systematic analysis, evaluation object is carried out to continuity decomposition according to evaluating the determined overall merit target of object, obtain (each layer) at different levels evaluation objective, and reach the evaluation index of degree using orlop index as measurement target.Then calculate a comprehensive grading index according to these indexs the overall merit target of evaluation object is evaluated, determine the good and bad grade of evaluation object according to its size.
Ratio scale method is mainly used in people estimates the quality difference of things, generally can show well with 5 kinds of differentiations, in the time of the higher precision of needs, can also between differentiation, make comparison facing mutually, thereby form 9 kinds of differentiations, quantifying is exactly 9 scales (referring to table 1).
Table 1 scale and implication thereof
According to ratio scale method, what obtain various indexs relatively judges preferred matrix in pairs, calculates initial weight coefficient by formula (1).
Press formula (2) and calculate normalized weight coefficient.
The weight coefficient that formula (2) is calculated, substitution A
i=W
1r
1+ W
2r
2+ ...+W
mr
m(i=1,2......24, m=1,2......), the load that obtains each scheme is cut down effect comprehensive evaluation index value.Wherein: A
ibe that i scheme load cut down effect 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, can in numerous assembled schemes of multiple water treatment technology, optimize effect optimal case, effectively solve the problem that water correction scheme optimization is selected, environmental management department decision references is provided, the design proposal of 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.
Brief description of the drawings
Fig. 1-techniqueflow block diagram of the present invention.
Fig. 2-water treatment field experiment design diagram, wherein 1 represents water pump, and 2 represent preliminary sedimentation tank, and 3 represent constant flow pump, and 4 representatives become a mandarin, and 5 represent emergent aquactic plant floating bed, and 6 represent submerged plant mattress, and 7 represent biological rope, and 8 represent out stream.
Embodiment
Taking red flag river, Taihu Lake basin River Network as example, application the inventive method has been carried out the optimization of water correction scheme and has been selected.Red flag river is positioned at Luoyang town, Wujin District, and from horse relaxation station creek, east enters Wu Jingang, total length 1.68km, the average 16m of river width, the dark average 1.68m in river, sluggish flow.Hydrodynamic force and the water quality in application QUAL2K modeling red flag river, carry out parameter verification.
Fig. 2 is shown in experimental design.At red flag river bank, adopt emergent aquactic plant floating bed, adopt submerged plant mattress, biological rope respectively river to be processed.Experiment is carried out in the water vat of long 60cm, wide 40cm, high 50cm, the depth of water 40cm of design, and going out the hydraulic detention time that flow makes each device is 1 day.First with water pump by river suction preliminary sedimentation tank, precipitate one day, then flow in emergent aquactic plant floating bed, submerged plant mattress, three experimental provisions of biological rope.Emergent aquactic plant bed plantation canna, plant height scope, at 20-30cm, arranges transverse and longitudinal interval and is 15cm left and right, adopts vacuum plastic water surface floating bed to be fixed on bamboo framework, plants 12 strain cannas in water tank.Submerged plant bed plantation hornwort 0.6kg, uses plastic screen to be fixed in water tank.Biological rope adopts the PP+K-45 type of Japanese TBR Co., Ltd. research and development, the upper and lower two ends of biological rope are fixed on bamboo framework, transverse and longitudinal interval is set and is 10cm, 24 of the biological ropes of installation length 0.4m in water tank, after biological rope sets, bamboo framework is positioned in water tank.
The influent concentration of monitoring and go out water concentration by experiment, adopt first order kinetics reactional equation to calculate the main water quality degradation coefficient of each water technology, comprise BOD oxidation rate, Ammonia Nitrification speed, the anti-digestion rate of nitre nitrogen, organic nitrogen hydrolysis rate, organophosphorus hydrolysis rate, Phos absorption rate.Be six kinds of schemes by emergent aquactic plant floating bed, employing submerged plant mattress, three kinds of technology permutation and combination of biological rope, be shown in Table 2.
The water correction scheme of three kinds of technical combinations of table 2
River is divided and is divided into three sections of upstreams, middle reaches, downstream, every section of 0.5km.The degradation coefficient obtaining according to field experiment is set the main water quality parameter in each section, and main degradation coefficient is respectively BOD oxidation rate, Ammonia Nitrification speed, nitre nitrogen denitrification rate, organic nitrogen hydrolysis rate, organophosphorus hydrolysis rate, Phos absorption rate.Adopt six kinds of water correction schemes of QUAL2K simulation, the water-quality guideline that obtains each scheme goes out water concentration.According to water correction program simulation result and river outlet water at tail end concentration, the reduction rate that calculates the main water quality factor of each scheme is shown in Table 3.
The reduction rate of the main water quality factor of table 3 each scheme latter end water outlet
Choose BOD, NH
3-N, NO
3-N, organic nitrogen, organophosphorus, 6 water-quality guideline of Phos are set up water correction scheme recruitment evaluation index system.Adopt ratio scale method, calculate BOD, NH
3-N, NO
3the weight coefficient of-N, organic nitrogen, organophosphorus, Phos is respectively 0.23,0.32,0.10,0.15,0.09,0.11.
By weight coefficient substitution A
i=W
1r
1+ W
2r
2+ ...+W
mr
mobtain load 1., 2., 3., 4., 5., 6. of scheme and cut down effect assessment exponential quantity and be respectively 0.41,0.40,0.38,0.36,0.37,0.38, six kinds of schemes to the treatment effect in red flag river by by force to a little less than be followed successively by: 1., 2., 3., 6., 5., 4..1. scheme designs biological rope, emergent aquactic plant floating bed, submerged plant mattress successively to red flag river load reduction best results.And from 1., 2. treatment effect all more by force, it is better that upstream arranges biological rope technical finesse effect.
The above, be only case study on implementation of the present invention, is not the restriction of the present invention being made to other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present invention, still belong to the protection domain of technical solution of the present invention.
Claims (6)
1. utilize water quality model to simulate a method for preferred water correction scheme, the steps include: (1) application QUAL2K modeling river hydrodynamic force and water quality, model parameter is calibrated and checking; (2) adopt emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope to process respectively river on bank, river; (3), by water treatment field experiment data, calculate the degradation coefficient of emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope; (4) be six kinds of water correction schemes by emergent aquactic plant floating bed, submerged plant mattress, three kinds of technology permutation and combination of biological rope, the degradation coefficient that adopts field experiment to obtain, by six kinds of different water technology assembled schemes of QUAL2K modeling; (5) calculate the load reduction rate of various scheme outlet water at tail ends, adopt Analytical Hierarchy Process in Evaluation to choose Optimum combinational scheme.
2. a kind of method of utilizing water quality model to simulate preferred water correction scheme according to claim 1, the degradation coefficient that it is characterized in that the water technology field experiment to obtain input water quality model, adopts QUAL2K modeling water correction scheme.
3. a kind of method of utilizing water quality model to simulate preferred water correction scheme according to claim 1, is characterized in that the degradation coefficient of submerged plant mattress, emergent aquactic plant floating bed, three kinds of water technologies of biological rope is calculated and obtained by field experiment measured data.
4. a kind of method of utilizing water quality model to simulate preferred water correction scheme according to claim 1, is characterized in that by water quality model analogy method, water correction scheme being in optimized selection.
5. a kind of method of utilizing water quality model to simulate preferred water correction scheme according to claim 1, it is characterized in that the utilization by the method, can in numerous assembled schemes of multiple water treatment technology, optimize effect optimal case, effectively solve the problem that water correction scheme optimization is selected, for environmental management department provides decision support.
6. utilize water quality model to simulate a method for preferred water correction scheme, the steps include: (1) application QUAL2K modeling river hydrodynamic force and water quality, model parameter is calibrated and checking; (2) adopt emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope to process respectively river on bank, river; (3), by water treatment field experiment data, calculate the degradation coefficient of emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope; (4) be six kinds of water correction schemes by emergent aquactic plant floating bed, submerged plant mattress, three kinds of technology permutation and combination of biological rope, the degradation coefficient that adopts field experiment to obtain, by six kinds of different water technology assembled schemes of QUAL2K modeling; (5) calculate the load reduction rate of various scheme outlet water at tail ends, adopt Analytical Hierarchy Process in Evaluation to choose Optimum combinational scheme;
The concrete preferred steps in above-mentioned steps (1)-(5) is as follows:
1) by on-site inspection and Data acquisition,, obtain the required hydrodynamic force water quality data of simulating river, comprise that flow, flow velocity, river width, river are dark, biochemical oxygen demand (BOD), ammonia nitrogen (NH
3-N), nitre nitrogen (NO
3-N), total nitrogen (TN), Phos, total phosphorus (TP).Hydrodynamic force and the water quality of application QUAL2K model to river is simulated, and is analyzed with measured data, carries out calibration and the checking of Stream Water Quality Models parameter;
2) adopt emergent aquactic plant floating bed, submerged plant mattress, three kinds of water technologies of biological rope to process respectively river on bank, river.Experimental provision adopts organic glass water tank, and experimental establishment is little in temperature Change, plant growth is vigorous, microbial growth spring and summer season faster.Emergent aquactic plant adopts vacuum plastic water surface floating bed to plant in organic glass water tank, and submerged plant is used plastic screen to be fixed in water tank, and biological rope transverse and longitudinal keeps at a certain distance away and hangs and be fixed in water tank.By the water flow in constant flow pump control experimental provision, make flow velocity identical with river mean flow rate, after sampling, monitor each technical unit water-in and water-out water quality at scene;
3), by water treatment field experiment, obtain 3 kinds of technology to BOD, NH
3-N, NO
3the result data of-N, organic nitrogen, organophosphorus, Phos, adopt first order kinetics reactional equation to calculate the degradation coefficient of each water technology to main water-quality guideline in sewage treatment plant tail water, comprise BOD oxidation rate, Ammonia Nitrification speed, the anti-digestion rate of nitre nitrogen, organic nitrogen hydrolysis rate, organophosphorus hydrolysis rate, Phos absorption rate.Because experimental water is the on-the-spot water intaking in river, experimental design flow velocity is consistent with river flow, and therefore water quality condition is identical, hydrodynamic force situation is similar, and it is reliably rationally that the parameter calculating is applied to river water technology simulation;
First order kinetics reactional equation, i.e. C=C
0e
-Kt, in formula: t is the reaction time, d; K is ammonia nitrogen degradation coefficient, 1/d; C is the pollutant levels of t chronometry, mg/L; C
0for the initial concentration of pollutant, mg/L.Can obtain degradation coefficient K=t by formula
-1lnC
0/ C.According to the natural logarithm of initial concentration and measurement result concentration ratio and time (my god) linear regression, obtain the equation of degrading, slope is degradation coefficient;
4) degradation coefficient of different technologies is set in different sections, the water technology that representative simulation is different.River is divided into 3 sections, corresponding section in the degradation coefficient of each water technology input water quality model, the various assembled scheme of representative simulation.Emergent aquactic plant floating bed, submerged plant mattress, biological rope can permutation and combination be 6 kinds of water correction schemes.The degradation coefficient obtaining according to field experiment is set the main water quality parameter in each section, adopts the enforcement in river respectively of 6 kinds of water correction schemes of QUAL2K modeling;
QUAL2K model is the latest edition of the QUAL series water quality model of EPA's research and development, is comprehensive, a diversified Stream Water Quality Models, is applicable to the dendritic water quality of river that simulation mixes completely.This model can be used for simulating the dendritic network of waterways, basin, and it both can be used as steady-state model, the dynamic model becoming also can be used as time.
5) calculate the load reduction rate of various schemes to main water-quality guideline by analog result, choose BOD, NH
3-N, NO
3-N, organic nitrogen, organophosphorus, the main water-quality guideline of Phos are set up water correction scheme recruitment evaluation index system, then adopt ratio scale method to calculate the weight coefficient of each water quality factor, finally choose optimum water correction scheme by Analytical Hierarchy Process in Evaluation.
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| CN104318335A (en) * | 2014-11-15 | 2015-01-28 | 南京大学 | Method for optimizing and assessing riverway waste water ecological purification scheme |
| CN108428193A (en) * | 2017-07-06 | 2018-08-21 | 西安科技大学 | System and its application method are supported in a kind of water prevention and cure of pollution programmed decision-making |
| CN108928928A (en) * | 2018-08-13 | 2018-12-04 | 武汉新天达美环境科技股份有限公司 | A kind of water correction method for dispersing Point source treating |
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| CN104318335A (en) * | 2014-11-15 | 2015-01-28 | 南京大学 | Method for optimizing and assessing riverway waste water ecological purification scheme |
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| CN113158122A (en) * | 2021-04-29 | 2021-07-23 | 东莞理工学院 | Urban water system water quality improvement method based on dynamic water system connectivity calculation |
| CN116282497A (en) * | 2023-01-05 | 2023-06-23 | 广州澄然环境科技有限公司 | Medical wastewater treatment system and treatment method |
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