CN111798104B - Overflow pollutant management and control evaluation method based on equivalent principle - Google Patents
Overflow pollutant management and control evaluation method based on equivalent principle Download PDFInfo
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- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 122
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 122
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 92
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
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Abstract
The invention discloses an overflow pollutant control evaluation method based on an equivalent principle, which takes overflow pollutant total quantity control as a control index, and determines overflow pollutant control target concentration according to the equivalent principle, namely, the principle that the combined system effect is not lower than the split system effect. The invention scientifically determines the total amount and the target of overflow pollutant control based on an equivalent principle, provides the most reasonable overflow pollutant control evaluation index under the existing execution standard and actual conditions, does not need to consider the complex cause of overflow, only needs to obtain the overflow water quantity, a certain pollutant concentration in overflow and the ammonia nitrogen concentration in overflow through long-term monitoring, and can obtain the target concentration of a certain pollutant in overflow by combining the overflow water quantity needing to be controlled, thereby greatly reducing the implementation difficulty and being suitable for comprehensive popularization.
Description
Technical Field
The invention belongs to the field of overflow pollutant control, and particularly relates to an overflow pollutant control evaluation method based on an equivalent principle.
Background
The combined drainage system and the split drainage system are two common drainage systems in urban drainage systems, and each drainage system has advantages and disadvantages. China mainly promotes the split-flow drainage system, but throughout the development of urban drainage systems in China, such as Beijing, shanghai, wuhan and the like, in the United states, germany, england, swedish, japan and the like, the realization of thorough split-flow system still has long routes, and the combined-flow system and the incomplete split-flow system coexist for a long time [1] . Most urban sewage pipe networks and sewage treatment plants are built according to ideal diversion systems, part of the combined water overflows in a drainage system (the main pipe overflows or the front overflow is mainly the middle and downstream overflow of the sewage system), and the part of the overflow water is practically rainwater and sewage mixed water, and if the direct drainage environment is not controlled, the water environment of the receiving water body can be greatly influenced, and even the water body is black and odorous in severe cases.
The existing overflow control targets mainly have the following problems: 1. the overflow control indexes are too many, and the overflow control indexes commonly adopted in the country and the country at present comprise three indexes or a combination of the three indexes in overflow volume control rate, overflow frequency control and overflow pollutant total quantity control, and as the three indexes have strong correlation and lack of overflow calendar year actual measurement data everywhere, great difficulty often exists in determining the overflow control indexes; 2. in the sponge city construction evaluation standard (GB/T51345-2018), the national level firstly provides double 50 quantitative indexes (namely, the annual overflow volume control rate is more than or equal to 50 percent, the concentration of controlled SS (suspended solids) is less than or equal to 50 mg/L) for controlling a diversion-system rain sewage mixed-connection discharge port (in fact, an incomplete diversion system) and a confluence-system overflow discharge port in a rainy day, but the result executed according to the standard can not meet the requirement of environmental protection, and if the standard is controlled according to the first-level A standard of the pollutant discharge standard GB 18918-2002 of a municipal sewage treatment plant, the standard is too high for overflow pipe control, the difficulty is too great in specific execution, and the practical reference significance is avoided. The goal of spill pollution control should therefore be how to determine what emission criteria should be implemented after spill clean-up, which is the biggest problem encountered in current local level implementation of spill pollution control.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide an overflow pollutant control and evaluation method based on an equivalent principle, and the aim of controlling the concentration of the overflow pollutant determined by the method can achieve the aim that the combined system effect is not lower than the split system effect.
The technical scheme adopted by the invention is as follows: the overflow pollutant control evaluation method based on the equivalent principle takes the total amount of overflow pollutants as a control index, and determines the target concentration of the overflow pollutants according to the equivalent principle, namely, the principle that the combined flow effect is not lower than the split flow effect, and comprises the following steps:
firstly, ammonia nitrogen is selected as a comparison factor, overflow water quantity and ammonia nitrogen concentration in the overflow water quantity are monitored at an overflow port, and Q is obtained according to the monitoring result Overflow valve Andaccording to the law of conservation of mass of pollutants, the relation is obtained:
wherein:
Q overflow valve Overflow water quantity, ten thousand tons/day
Q Dirt overflow -urban domestic sewage in overflow, ten thousand tons/day
Q Rain overflow -urban rainwater runoff in overflow, ten thousand tons/day
Ammonia nitrogen concentration in overflow water, mg/L
Ammonia nitrogen concentration in town domestic sewage, mg/L, takes typical value
Ammonia nitrogen concentration in town rainwater runoff, mg/L
The ammonia nitrogen concentration in the town rainwater runoff is low and is neglected, (1) is simplified into
Step two, according to the equivalent principle, the pollutant reduction amount in the overflow is not lower than the pollutant amount which is required to be reduced by sewage in the overflow according to urban domestic sewage treatment, and the formula (2) is combined to obtain:
wherein:
W overflow dirt collection Total pollutant reduction in overflow, kg/d
C Dirt and soil -concentration of a certain contaminant in town domestic sewage, mgand/L, taking typical value or water inlet concentration of dry season in sewage plant
C A Certain pollutant concentration corresponding to first-class A standard of pollutant emission standard of urban sewage treatment plant, mg/L
Step three, monitoring the concentration of a certain pollutant in overflow at the overflow port to obtain C Overflow valve The specific numerical value of (1) comprehensively determines the overflow water quantity Q to be controlled in overflow during comparison and selection of the control technical scheme Spillover pipe Determining a target control concentration of overflowed pollutants, wherein the total reduction amount of a certain pollutant in the overflow is the product of the overflow water quantity to be controlled in the overflow and the control degree of the certain pollutant:
W overflow dirt collection ＝Q Spillover pipe ·(C Overflow valve -C Order of (A) ) (4)
Wherein:
C order of (A) Target control concentration of a certain pollutant in overflow, mg/L
C Overflow valve -concentration of a certain contaminant in the overflow, mg/L
Q Spillover pipe The overflow volume to be controlled in the overflow, ten thousand tons/day
From (2) - (4), a target control concentration of a contaminant in the overflow can be derived as:
and step four, selecting a plurality of overflow pollutants as target control factors, arranging purification equipment at an overflow port, monitoring the water quality of the effluent of the purification equipment, if the monitoring result shows that the concentration of all the target control factors reaches the corresponding pollutant target control concentration, directly discharging the purified effluent, and if the monitoring result shows that the concentration of a certain target control factor does not reach the corresponding pollutant target control concentration, adding new purification equipment at the overflow port aiming at the target control factor until the effluent reaches the corresponding pollutant target control concentration.
Preferably, the overflow water quantity Q to be controlled in the overflow in the third step Spillover pipe Greater than or equal to the overflow water quantity Q Overflow valve 80% of (C). By adopting the mode, the overflow pollutant is prevented from greatly influencing the water environment of the receiving water body, and the control difficulty in the process of controlling the overflow pollutant under the existing condition is also considered.
Preferably, COD and SS are selected as target control factors of overflow pollutants in the step four. By adopting the mode, as the overflow has the characteristics of short time, large quantity and the like, the overflow exists for a long time, and the overflow water purifying facility can be in an idle state for about 90% of the whole year, if urban domestic sewage is referred to, COD, BOD, SS, N, P and the like are all used as control target factors, the investment is extremely wasted, the correlation between BOD, N, P and COD and SS is considered, the reduction of BOD, N and P in the overflow can be controlled to a certain extent through the reduction of COD and SS, and meanwhile, the overflow pollutant purification is based on the principle of quick water purification, so that the selection of the COD and SS as target control factors is reasonable.
Preferably, when a plurality of overflow ports exist in the service range of a certain town sewage treatment plant, the total overflow amount of each overflow port to be controlled can be combined according to the total overflow pollutant amount to be controlled in the service range of the town sewage treatment plant, and the total overflow pollutant amount to be controlled in the service range of the town sewage treatment plant is as follows:
W total of plant waste ≥Q Dry soil ·(C Dry soil -C A )-Q Rain and sewage ·(C Rain and sewage -C A ) (6)
Wherein:
W total of plant waste Total amount of overflow pollutants to be controlled in the service area of sewage plants, kg/d
Q Dry soil Water quantity of sewage plant entering in dry season, ten thousand tons/day
Q Rain and sewage The water quantity of the sewage plant entering the sewage plant in rainy season is ten thousand tons/day, and is not more than 30 percent of the design capacity
C Dry soil -concentration of a certain pollutant, mg/L, of water entering a dry season of a sewage plant
C Rain and sewage -concentration of a certain pollutant in the water entering the sewage plant in rainy season, mg/L
By adopting the mode, the total amount of overflow pollutants which are required to be controlled in the service range of the urban sewage treatment plant is controlled, and the total amount of overflow which is required to be controlled by each overflow port can be reasonably regulated according to actual conditions, so that the establishment of a control target is more flexible.
The beneficial effects of the invention are as follows: 1. based on an equivalent principle, the total overflow pollutant control amount and the control target are scientifically determined, and the most reasonable overflow pollutant control evaluation index under the existing execution standard and actual conditions is provided, and the combined flow system effect is not lower than the split flow system effect by referring to the evaluation index; 2. the method has the advantages that the complex cause of overflow is not needed to be considered, the overflow water quantity, the concentration of a certain pollutant in the overflow and the concentration of ammonia nitrogen in the overflow are obtained only through long-term monitoring, and the target control concentration of a certain pollutant in the overflow can be obtained by combining the overflow water quantity needing to be controlled, so that the implementation difficulty is greatly reduced, and the method is suitable for comprehensive popularization.
Detailed Description
The invention is further illustrated by the following examples:
the overflow pollutant control evaluation method based on the equivalent principle takes the total amount of overflow pollutants as a control index, and determines the target concentration of the overflow pollutants according to the equivalent principle, namely, the principle that the combined flow effect is not lower than the split flow effect, and comprises the following steps:
firstly, ammonia nitrogen is selected as a comparison factor, overflow water quantity and ammonia nitrogen concentration in the overflow water quantity are monitored at an overflow port, and Q is obtained according to the monitoring result Overflow valve Andaccording to the law of conservation of mass of pollutants, the relation is obtained:
wherein:
Q overflow valve Overflow water quantity, ten thousand tons/day
Q Dirt overflow -urban domestic sewage in overflowTon/day
Q Rain overflow -urban rainwater runoff in overflow, ten thousand tons/day
Ammonia nitrogen concentration in overflow water, mg/L
Ammonia nitrogen concentration in town domestic sewage, mg/L, takes typical value
Ammonia nitrogen concentration in town rainwater runoff, mg/L
The ammonia nitrogen concentration in the town rainwater runoff is low and is neglected, (1) is simplified into
With reference to outdoor drainage design Specification and the quality of incoming water (Table 1) of a typical urban sewage treatment plant in certain markets, the typical design of the concentration of pollutants in urban sewage treatment plants into the plant can be obtained, wherein NH 3 The concentration of N is 30-40 mg/L, the concentration of ammonia nitrogen in surface runoff is lower and is 1-3 mg/L, compared with urban domestic sewage, the method is negligible, in view of the operation condition that the overflow state is generally that the amount of rainwater and other passenger water entering a sewage converging pipe network exceeds the pipe network holding capacity, at the moment, the overflow water and the mixed water in the pipe network are the same, the ammonia nitrogen in the overflow can be regarded as all from urban domestic sewage, the ammonia nitrogen is selected as a comparison factor, the monitoring is more convenient, and the total nitrogen can be selected as the comparison factor in the practical application process. As can be seen from Table 1, the concentrations of chemical oxygen demand (COD, at most, 80-500 mg/L) and suspended matters (SS, at most, 130-800 mg/L) in the surface runoff are high, and the chemical oxygen demand and suspended matters are high in comparability with urban domestic sewage.
TABLE 1 quality of influent Water from typical urban wastewater treatment plants in certain markets
Step two, according to the equivalent principle, the pollutant reduction amount in the overflow is not lower than the pollutant amount which is required to be reduced by sewage in the overflow according to urban domestic sewage treatment, and the formula (2) is combined to obtain:
wherein:
W overflow dirt collection Total pollutant reduction in overflow, kg/d
C Dirt and soil -concentration of a certain pollutant in town domestic sewage, mg/L, taking a typical value or concentration of intake water in dry seasons of a sewage plant
C A Certain pollutant concentration corresponding to first-class A standard of pollutant emission standard of urban sewage treatment plant, mg/L
(3) In the formula, due to C Dirt and soil 、C A 、C Dirty NH3-N All are fixed values, the total reduction amount of a certain pollutant in overflow is mainly related to the overflow water quantity and ammonia nitrogen concentration in the overflow water quantity, and the overflow water quantity Q Overflow valve Ammonia nitrogen concentration in overflow waterThe total reduction amount of a certain pollutant in the scientific overflow can be calculated by long-term monitoring data of the overflow port. Because the rainwater contains a small amount of ammonia nitrogen, the urban domestic sewage quantity in the overflow obtained in the formula (1) is slightly higher than the actual sewage quantity, and therefore, the reduction total quantity of a certain pollutant in the overflow is slightly higher than the pollutant quantity which should be reduced in urban domestic sewage treatment under the split system.
Step three, at the overflow portMonitoring the concentration of a certain pollutant in the overflow to obtain C Overflow valve The specific numerical value of (1) comprehensively determines the overflow water quantity Q to be controlled in overflow during comparison and selection of the control technical scheme Spillover pipe Determining a target control concentration of overflowed pollutants, wherein the total reduction amount of a certain pollutant in the overflow is the product of the overflow water quantity to be controlled in the overflow and the control degree of the certain pollutant:
W overflow dirt collection ＝Q Spillover pipe ·(C Overflow valve -C Order of (A) ) (4)
Wherein:
C order of (A) Target control concentration of a certain pollutant in overflow, mg/L
C Overflow valve -concentration of a certain contaminant in the overflow, mg/L
Q Spillover pipe The overflow volume to be controlled in the overflow, ten thousand tons/day
From (2) - (4), a target control concentration of a contaminant in the overflow can be derived as:
(5) In the formula, due to C Dirt and soil 、C A 、C Dirty NH3-N All are fixed values, and the target control concentration C of a certain pollutant in overflow Order of (A) Mainly and overflow water quantity Q Overflow valve The overflow water quantity Q to be controlled in overflow Spillover pipe Concentration C of the contaminants in overflow Overflow valve Concentration of ammonia nitrogen in overflow waterRelated to the overflow water quantity Q to be controlled Spillover pipe Can be comprehensively determined during comparison and selection of the control technical scheme, and the rest can be obtained through long-term monitoring of an overflow port, so that the target control concentration C of a certain pollutant in scientific overflow can be deduced Order of (A) 。
TABLE 2 total control of contaminants in an overflow port overflow and target threshold
An overflow port for accumulating overflow water of about 10 ten thousand tons during a certain rainfall period, and overflow time of about 5 hours, wherein overflow water is discharged after all purification control, and the concentration of pollutants C in urban domestic sewage Dirt and soil Taking the value according to the table 2 by referring to the table 1, and monitoring the water quality to obtain the average concentration C of pollutants in overflow Overflow valve As shown in Table 2, the total amount W of each contaminant in the overflow Overflow dirt collection Target control concentration C of each pollutant in overflow Order of (A) As shown in table 2. According to the overflow total purification control back outer row and the partial purification back outer row, obtaining the target control concentration C of each pollutant in the overflow under different modes Order of (A) As shown in table 3. From this, it can be seen that the overflow port is required to control the overflow water quantity Q Spillover pipe The direct discharge mode of the whole purification part and the partial purification part can be adopted, and the mode can be adopted to calculate the scale of the water purification structure and the preferential selection after investment according to the water load and the water quality load, but the overflow water quantity to be controlled is not less than 80 percent. If the water environment quality of the receiving water body is poor and the overflow is the main pollution factor, the control target should be properly improved.
TABLE 3 target thresholds for controlling contaminants at different levels of decontamination for overflow from an overflow port
And step four, selecting a plurality of overflow pollutants as target control factors, arranging purification equipment at an overflow port, monitoring the water quality of the effluent of the purification equipment, if the monitoring result shows that the concentration of all the target control factors reaches the corresponding pollutant target control concentration, directly discharging the purified effluent, and if the monitoring result shows that the concentration of a certain target control factor does not reach the corresponding pollutant target control concentration, adding new purification equipment at the overflow port aiming at the target control factor until the effluent reaches the corresponding pollutant target control concentration.
The sponge city construction evaluation standard clearly proposes that the overflow water purifying process mainly comprises the physical and chemical processes of primary treatment, disinfection, primary treatment, filtration, disinfection, precipitation, artificial wetland and the like, and the nutrient factors BOD, N and P required by biological growth are difficult to ensure in a non-overflow state, so that the overflow water purifying process is not suitable for selecting biological processes, but a rapid water purifying process is required to be selected, and the physical and chemical water purifying technologies such as sand settling, precipitation, filtration and the like are mainly used. In order to meet the environmental protection requirement and further improve the environment, the overflow port is provided with purifying equipment, and the overflow pollutant is most reasonably discharged nearby purifying treatment.
The overflow pollutant is selected as a target control factor, and is comprehensively determined according to rainfall condition, overflow frequency, whether water purifying facilities can normally operate in time, economic conditions and water environment requirements of the receiving water body. Because overflow has the characteristics of short time, large quantity and the like, the overflow water purifying facility exists for a long time, and the overflow water purifying facility can be in an idle state for about 90% of the whole year, if the urban domestic sewage treatment is referred to, COD, BOD, SS, N, P and the like are all used as control target factors, the investment is inevitably wasted greatly. Considering the correlation of BOD, N, P and COD and SS, the reduction of BOD, N, P in overflow can be controlled to a certain extent by the reduction of COD and SS, meanwhile, the overflow water purification process should take rapid water purification as a principle, and according to the actual conditions of the overflow ports, the average value of the control target factors is suggested as follows: COD is not higher than 100mg/L; SS, not higher than 120mg/L, and in addition, the pollutant discharge standard of urban sewage treatment plants should be consulted during actual control, the fecal coliform is selected as a control target factor, and the fecal coliform is not higher than 1000/L.
Further, (3) the formula comparison is suitable for determining the total amount of overflow pollutant control of a certain overflow port, when a plurality of overflow ports exist in the service range of a certain town sewage treatment plant, the total amount of overflow to be controlled of each overflow port can be combined according to the total amount of overflow pollutant to be controlled in the service range of the town sewage treatment plant, and the total amount of overflow pollutant to be controlled in the service range of the town sewage treatment plant is as follows:
W total of plant waste ≥Q Dry soil ·(C Dry soil -C A )-Q Rain and sewage ·(C Rain and sewage -C A ) (6)
Wherein:
W total of plant waste -total amount of overflow pollutants to be controlled in the service area of the sewage plant, kg/d;
Q dry soil -water intake of a sewage plant in dry seasons, ten thousand tons/day;
Q rain and sewage The water quantity of the sewage plant entering the plant in rainy seasons is ten thousand tons/day, and generally does not exceed 30% of the design capacity;
C dry soil -a concentration of a certain pollutant, mg/L, of the dry season influent water of the sewage plant;
C rain and sewage -a concentration of a certain contaminant, mg/L, of the incoming water of the sewage plant in rainy season.
The urban domestic sewage completely enters the sewage plant in dry season, part of the urban domestic sewage overflows in rainy season, and part of the urban domestic sewage enters the sewage plant, and the total amount of pollutants in urban rainwater runoff in the overflow is negligible compared with the total amount of pollutants in the urban domestic sewage in overflow, so that the total amount of pollutants to be controlled by the urban sewage plant in dry season minus the total amount of pollutants to be controlled by the urban sewage plant in rainy season is equal to the total amount of overflow pollutants to be controlled in the service range of the urban sewage plant.
At present, the complete diversion system is difficult to realize in a short period, overflow pollutant control is focused as the difficulty and key point of improving quality and enhancing efficiency of urban sewage treatment, the core purpose of developing overflow control is to reduce pollutants in overflow, and the overflow pollutant control evaluation method can realize that the confluence effect is not lower than the diversion system effect. To scientifically determine the total amount and the target of overflow pollutant control, the detailed overflow water amount and water quality monitoring data are important, and the monitoring of the water quality and the water quantity of overflow ports, especially COD, SS and NH, in rainy season should be carried out for a long time 3 The concentration of N provides a basis for target formulation, and meanwhile, the total amount and the target of overflow pollutant control are dynamically adjusted according to the monitoring data.
Claims (4)
1. The overflow pollutant control evaluation method based on the equivalent principle takes the total overflow pollutant amount control as a control index, and is characterized in that the overflow pollutant control target concentration is determined according to the equivalent principle, namely, the principle that the combined system effect is not lower than the split system effect, and the method comprises the following steps:
firstly, ammonia nitrogen is selected as a comparison factor, overflow water quantity and ammonia nitrogen concentration in the overflow water quantity are monitored at an overflow port, and Q is obtained according to the monitoring result Overflow valve Andaccording to the law of conservation of mass of pollutants, the relation is obtained:
wherein:
Q overflow valve Overflow water quantity, ten thousand tons/day
Q Dirt overflow -urban domestic sewage in overflow, ten thousand tons/day
Q Rain overflow -urban rainwater runoff in overflow, ten thousand tons/day
Ammonia nitrogen concentration in overflow water, mg/L
Ammonia nitrogen concentration in town domestic sewage, mg/L, takes typical value
Ammonia nitrogen concentration in town rainwater runoff, mg/L
The ammonia nitrogen concentration in the town rainwater runoff is low and is neglected, (1) is simplified into
Step two, according to the equivalent principle, the pollutant reduction amount in the overflow is not lower than the pollutant reduction amount of the sewage in the overflow according to the urban domestic sewage treatment, and the formula (2) is combined to obtain:
wherein:
W overflow dirt collection Total pollutant reduction in overflow, kg/d
C Dirt and soil -concentration of a certain pollutant in town domestic sewage, mg/L, taking a typical value or concentration of intake water in dry seasons of a sewage plant
C A Certain pollutant concentration corresponding to first-class A standard of pollutant emission standard of urban sewage treatment plant, mg/L
Step three, monitoring the concentration of a certain pollutant in overflow at the overflow port to obtain C Overflow valve The specific numerical value of (1) comprehensively determines the overflow water quantity Q to be controlled in overflow during comparison and selection of the control technical scheme Spillover pipe Determining a target control concentration of overflowed pollutants, wherein the total reduction amount of a certain pollutant in the overflow is the product of the overflow water amount to be controlled in the overflow and the control degree of the certain pollutant:
W overflow dirt collection ＝Q Spillover pipe ·(C Overflow valve -C Order of (A) ) (4)
Wherein:
C order of (A) Target control concentration of a certain pollutant in overflow, mg/L
C Overflow valve -concentration of a certain contaminant in the overflow, mg/L
Q Spillover pipe The overflow volume to be controlled in the overflow, ten thousand tons/day
From (2) - (4), a target control concentration of a contaminant in the overflow can be derived as:
and step four, selecting a plurality of overflow pollutants as target control factors, arranging purification equipment at an overflow port, monitoring the water quality of effluent of the purification equipment, if a monitoring result shows that the concentration of all the target control factors reaches the corresponding pollutant target control concentration, directly discharging after purification, and if the monitoring result shows that the concentration of a certain target control factor does not reach the corresponding pollutant target control concentration, adding new purification equipment at the overflow port aiming at the target control factor until the effluent reaches the corresponding pollutant target control concentration.
2. The method for controlling and evaluating overflow pollutants based on the equivalent principle according to claim 1, which is characterized in that: the overflow water quantity Q to be controlled in the overflow in the third step Spillover pipe Greater than or equal to the overflow water quantity Q Overflow valve 80% of (C).
3. The method for controlling and evaluating overflow pollutants based on the equivalent principle according to claim 1, which is characterized in that: and step four, selecting COD and SS as target control factors of overflow pollutants.
4. The method for controlling and evaluating overflow pollutants based on the equivalent principle according to claim 1, which is characterized in that: when a plurality of overflow ports exist in the service range of a certain town sewage treatment plant, the total overflow quantity of each overflow port to be controlled can be combined according to the total overflow pollutant quantity to be controlled in the service range of the town sewage treatment plant, and the total overflow pollutant quantity to be controlled in the service range of the town sewage treatment plant is as follows:
W total of plant waste ≥Q Dry soil ·(C Dry soil -C A )-Q Rain and sewage ·(C Rain and sewage -C A ) (6)
Wherein:
W total of plant waste Total amount of overflow pollutants to be controlled in the service area of sewage plants, kg/d
Q Dry soil Water quantity of sewage plant entering in dry season, ten thousand tons/day
Q Rain and sewage The water quantity of the sewage plant entering the sewage plant in rainy season is ten thousand tons/day, and is not more than 30 percent of the design capacity
C Dry soil -concentration of a certain pollutant, mg/L, of water entering a dry season of a sewage plant
C Rain and sewage -a concentration of a certain contaminant, mg/L, of the incoming water of the sewage plant in rainy season.
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| KR20050080195A (en) * | 2002-12-17 | 2005-08-12 | 차희원 | The method and system for real time monitoring flow and pollution load in sewer system and storm sewer system during rainfall |
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| KR20050080195A (en) * | 2002-12-17 | 2005-08-12 | 차희원 | The method and system for real time monitoring flow and pollution load in sewer system and storm sewer system during rainfall |
| CN108399494A (en) * | 2018-02-02 | 2018-08-14 | 北京中科乾和环保科技服务有限公司 | Combined system regional pollution load abatement interception ratio determines method |
| CN109064048A (en) * | 2018-08-14 | 2018-12-21 | 时代华瑞（北京）环境科技有限公司 | Quickly check method and system in discharge of wastewater source based on wastewater treatment process analysis |
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