CN104217102A - Integrated method for calculating volume and load capacity of low pollution water in lake basin - Google Patents
Integrated method for calculating volume and load capacity of low pollution water in lake basin Download PDFInfo
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- CN104217102A CN104217102A CN201410392782.8A CN201410392782A CN104217102A CN 104217102 A CN104217102 A CN 104217102A CN 201410392782 A CN201410392782 A CN 201410392782A CN 104217102 A CN104217102 A CN 104217102A
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Abstract
The invention belongs to the technical field of water pollution control and ecological remediation. The invention discloses an integrated method for calculating a volume and a load capacity of low pollution water in a lake basin. On the basis of survey and research on low pollution water in a plurality of large lakes, aiming at three main types (tail water of a sewage treatment plant, rural agricultural runoff and town surface runoff) of the low pollution water in the lake basin, the systematic integrated method for calculating the water volume and a pollution load of the low pollution water in the lake basin is formed by refining, so that distribution characteristics and rules of different types of low pollution water in the lake basin are scientifically and reasonably estimated and foundations are provided for setting out measures for controlling the pollution load of the low pollution water in the lake basin. The calculating method is specific and has strong operability.
Description
Technical field
Process provides the large low stain water yield of main Types (sewage treatment plant tail water, rural area agricultural run-off, cities and towns rainwash) in lake drainage three and the computing method of low stain load, thus science, the characteristic distributions reasonably assessing the dissimilar low-pollution water in lake drainage and rule, for the control measure formulating lake drainage low-pollution water pollutional load provide basis.We's water pollution control owned by France and ecological restoration technical field.
Background technology
In recent years, along with the reinforcement of China's lake treatment dynamics and the proposition of lake treatment new concept, the pollution problem that low-pollution water brings more and more receives publicity, and low-pollution water is administered has become another challenge newly after lake drainage point source and pollution of area source control.Propose in " theory of lake eutrophication control, method and practice " book low-pollution water to comprise after sewage treatment facility process but to water body in lake still for the lower agricultural drain of the tail water of pollution source, rainwash and pollutant levels, rainy season village rainwash etc., lake drainage low-pollution water mainly comprises 3 kinds of main Types such as sewage treatment plant's two stage treatment tail water, cities and towns rainwash, agricultural drain (containing village rainwash).At present about the research of low-pollution water, mainly concentrate on low-pollution water Treatment process, comprising Artificial Wetland Techniques, natural wetland technology, biological floating bed technology, buffer strip technology etc., also has the research of the aspect such as material and progress for low-pollution water removal efficiency.But before effectively administering, should first understand the low stain water yield and pollutional load, according to the generation of the dissimilar low-pollution water in basin, pollution loading amount and space distribution thereof, analyze the characteristics and rules of lake drainage low-pollution water, and then science, reasonably propose low-pollution water control measures.At present, the computing method for the lake drainage low stain water yield and pollution loading amount have not been reported.This method on the basis of Main Lakes research practice in recent years, by the accumulation, the calculating lake drainage low stain water yield of a kind of comparatively system of condensed formation and the computing method of load thereof that calculate multiple lake drainage low stain water yield and pollution loading amount.
Summary of the invention
On the investigation of the low-pollution water that the present invention carries out in multiple large-size lake such as Fuxian Lake, Erhai, River, Lake Xingyun, Qilu Lake, long-lived lakes and Research foundation, for three large main Types (sewage treatment plant tail water, rural area agricultural run-off, cities and towns rainwash) of lake drainage low-pollution water, propose the circular of the lake drainage low stain water yield and low stain load, mainly comprise following several respects content: sewage treatment plant tail water amount and pollution loading amount calculate; The rural area agricultural run-off low stain water yield and load calculate, the cities and towns rainwash water yield and pollution loading amount calculate.This computing method specific, concrete, workable.
1, water yield cheek
Lake drainage low-pollution water total Water is the water yield summation of sewage treatment plant tail water, rural area agricultural run-off and cities and towns rainwash.Computing formula is:
Q＝Q
W+Q
N+Q
C
Three types low stain water yield Q
w, Q
n, Q
ccomputing method specific as follows:
(1) sewage treatment plant tail water
According to built or at the quantity of the sewage treatment plant built and treatment scale, calculate sewage treatment plant two stage treatment tail water water yield Q
w.
(2) rural area agricultural run-off
This method adopts to be calculated according to flush period farmland runoff yield and irrigation period agricultural drain gauge and according to rice season runoff water yield cheek 2 kinds of methods, result of calculation is carried out contrasting and check analysis, accurately to calculate the water yield that basin agricultural run-off produces, the computing formula of the rural area agricultural run-off water yield is as follows.
Q
N＝max(Q
J，Q
G)
Q
J＝R·A·a·10
-3
Q
G＝M
G·A·b
Q
N＝D·A
In formula: Q
nfor agricultural run-off water discharge, m
3/ a; Q
jflush period farmland runoff yield, m
3/ a; Q
gfor irrigation period agricultural drain amount, m
3/ a; R is rainfall amount, mm; A is farmland area, m
2; A is farmland runoff coefficient, %; MG is the average irrigation water capacity in farmland, m
3/ m
2; D is the rice season runoff water yield, m
3hm
-2; B is water efficiency of irrigation.
(3) cities and towns rainwash
This method adopts the total rainfall amount first calculating town-wide, then calculates according to the ratio of Initial Runoff, and the computing formula of the cities and towns rainwash water yield is as follows.
Q
C＝A×P×c
In formula: Q
cfor cities and towns flow path surface, m
3/ a; A is cities and towns construction land area, km
2; P is cities and towns annual rainfall, mm; C is Initial Runoff ratio.
2, pollution loading amount calculates
Lake drainage low-pollution water pollutional load total amount is the summation of sewage treatment plant tail water, rural area agricultural run-off and cities and towns Pollution Load of Urban Surface Runoff amount.Computing formula is:
L＝L
Wi+L
NN+L
Ci
Three types low-pollution water pollution loading amount L
wi, L
ni, L
cicomputing method specific as follows:
(1) sewage treatment plant tail water
Calculate pollution loading amount according to one-level B standard in GB18918-2002, sewage treatment plant tail water pollution loading amount computing formula is as follows.
L
Wi＝Q
W×C
Wi
In formula: L
wifor i pollutant sewage treatment plant tail water pollutional load, t/a; Q
wfor basin urban wastewater treatment scale, m
3/ a; C
wifor the mass concentration of i pollutant in urban wastewater treatment firm water outlet, mg/L, this method gets one-level B standard in corresponding GB18918-2002.
(2) rural area agricultural run-off
This method adopts average annual number of dropouts to confine value range, and carries out specializing of data by the coefficient method of national Pollutant source investigation, carries out coefficient correction to avoid deviation in actual computation.The computing formula of Farmland Flow Pollution load is as follows:
L
Ni＝Q
N×C
Ni
In formula: L
nifor i pollutant Farmland Flow Pollution load, m
3/ a; C
nifor the mass concentration of agricultural run-off i pollutant, mg/L.
(3) cities and towns rainwash
The calculating of cities and towns rainwash amount of pollutant has 2 kinds of methods, a kind of for calculating by the water yield and concentration, another kind of employing specific load method.
By the water yield and concentration cities and towns Pollution Load of Urban Surface Runoff computing formula:
L
Ci＝Q
C×C
Ci
In formula: L
cifor cities and towns Pollution Load of Urban Surface Runoff amount, m
3/ a; Q
cfor cities and towns flow path surface, m
3/ a; C
cifor the mass concentration of cities and towns rainwash i pollutant, mg/L.The mass concentration value of cities and towns rainwash pollutant can refer to the earth's surface pavement runoff pollutant levels of different cities.
Specific load method computing method are adopted to refer to " lake eutrophication control and administrative skill " the 18th page.
Embodiment
It is domestic that Erhai Lake basin is located in Dali Bai Autonomous prefecture, Yunnan, drainage area 2565km
2.Erhai Lake basin low-pollution water mainly comprises sewage treatment plant tail water, rural area agricultural run-off and rainwash three major types.Calculate its low stain water yield and load as stated above respectively, and then calculate Erhai Lake basin low-pollution water total Water and pollutional load total amount.
1, sewage treatment plant tail water
Built or at the quantity of the sewage treatment plant built and treatment scale according to Erhai Lake basin, calculate sewage treatment plant's two stage treatment tail water water yield; Pollution loading amount is calculated according to one-level B standard in GB 18918-2002.Erhai Lake basin has progressively set up cities and towns, market town two-stage sewage collecting disposal system, wherein municipal sewage plant mainly processes the sanitary sewage at urban district, Dali and county town, Eryuan County, have 3 altogether, the town sewerage treatment plant having run and built has 10.As calculated, Erhai Lake basin urban wastewater treatment firm processing power can reach 3,193 ten thousand t/a, and wherein city domestic sewage treatment plant is 2,445 ten thousand t/a, and town sewerage treatment plant is 7,480,000 t/a, in qualified discharge tail water, total nitrogen load amount is 639t/a, and total phosphorus load amount is 48t/a.
2, rural area agricultural run-off
According to the computing method of flush period farmland runoff yield and irrigation period agricultural drain amount, the annual agricultural run-off water discharge of Erhai Lake basin is 1.0 × 10 in flush period
8t/a, agricultural irrigation generation is 0.7 × 10
8t/a, then the annual agricultural run-off draining of Erhai Lake basin is estimated as 1.7 × 10
8t/a; According to rice season runoff water yield cheek, the annual agricultural run-off water discharge of Erhai Lake basin is 1.4 × 10
8t/a.After two method acquired results comparative analyses, the draining of Erhai Lake basin agricultural run-off gets 1.5 × 10
8t/a.
Farmland runoff pollution load estimation takes average annual number of dropouts method to estimate, with reference to the average annual number of dropouts of Dianchi Lake Basin farmland pollution thing, total nitrogen is 5.07 ~ 113.16kg/hm
2, total phosphorus is 0.15 ~ 10.14kg/hm
2, total nitrogen load amount is 128-2866t/a, and total phosphorus load amount is 3.8-256t/a, and adopt first time national Pollutant source investigation coefficient research, by revising farmland nitrogen and phosphorus loss coefficient, total nitrogen is 661t/a, and total phosphorus is 18t/a.
3, cities and towns rainwash
Source, face, Erhai Lake basin cities and towns derives from the population aggravation districts, small towns such as urban district, Dali, county town, Eryuan County, economic and technological development zone, Dali and Dali ancient city (Dali town), Feng Yi town, Xi Zhou town, shangguan town, and area is about 71km
2.Be 1048mm according to survey data cities and towns average yearly rainfall, show that total rainfall amount of basin town-wide is 7.5 × 10
7t/a.In a rainfall, account for the Initial Runoff of total runoff 20% or 25%, wash away the total runoff pollutional load having discharged about 50%, calculate according to the Initial Runoff ratio of 25%, therefore the rainwash water yield in cities and towns is 1.875 × 10
7t/a.
With reference to ShiShimonoseki town density of population, urban population density is by 1500 people/km
2meter, the Erhai Lake basin cities and towns rainwash water yield is 1.875 × 10
7t/a.Adopt the researching and analysing with reference to the earth's surface pavement runoff pollutant levels in Beijing, Shanghai City, Xi'an and city, Tianjin of concentration value in water quantity reduction computing method, in the rainwash of cities and towns, according to total nitrogen, to be 8mg/L and total phosphorus be that 0.6mg/L calculates, show that total nitrogen is 150t/a by formulae discovery, total phosphorus is 11t/a; Adopt specific load method to calculate, with reference to " lake eutrophication control and administrative skill ", 10kg/cm/km got by total nitrogen
2, 2.5kg/cm/km got by total phosphorus
2, show that total nitrogen is 144t/a by formulae discovery, total nitrogen is 20t/a.The numeric ratio that two kinds of methods calculate is comparatively consistent, and consider scientific, get 2 kinds of result of calculation averages and finally confirm that total nitrogen is 147t/a, total phosphorus is 15t/a.
In sum, calculating Erhai Lake basin low-pollution water total Water is 2.0086 × 10
8t/a, total nitrogen is 1447t/a, and total phosphorus is 81t/a.
Claims (7)
1. a lake drainage low stain water yield and load thereof calculate integrated approach.In multiple large-size lake low-pollution water investigation and Research foundation, for three large main Types (sewage treatment plant tail water, rural area agricultural run-off, cities and towns rainwash) of lake drainage low-pollution water, the integrated approach that the lake drainage low-pollution water water yield of a kind of comparatively system of condensed formation and pollutional load calculate, the method mainly comprises following several respects content: the sewage treatment plant tail water water yield and pollution loading amount calculate; The rural area agricultural run-off low stain water yield and load calculate, the cities and towns rainwash water yield and pollution loading amount calculate, this computing method specific, concrete, workable.
2. method according to claim 1, lake drainage low-pollution water total Water and pollutional load total amount are made up of sewage treatment plant tail water, rural area agricultural run-off, the cities and towns rainwash three major types type low stain water yield and pollution loading amount.
3. method according to claim 1, lake drainage low-pollution water total Water calculates according to the summation of sewage treatment plant tail water, rural area agricultural run-off, the cities and towns rainwash three major types type low stain water yield.
4. method according to claim 1, lake drainage low-pollution water pollutional load total amount calculates according to the summation of sewage treatment plant tail water, rural area agricultural run-off, cities and towns rainwash three major types type low-pollution water load amount.
5. method according to claim 1, the water yield of sewage treatment plant tail water is according to built or calculate in the quantity of the sewage treatment plant built and treatment scale, and the mass concentration that sewage treatment plant tail water pollution loading amount goes out water pollutant according to basin urban wastewater treatment scale and urban wastewater treatment firm calculates.
6. method according to claim 1, the rural area agricultural run-off water yield is calculated according to flush period farmland runoff yield and irrigation period agricultural drain gauge or according to rice season runoff water yield cheek, two kinds of result of calculations are carried out contrasting and check analysis, calculate the water yield that basin agricultural run-off produces, rural area Farmland Flow Pollution load calculates and adopts average annual number of dropouts to confine value range, and carry out specializing of data by the coefficient method of national Pollutant source investigation, in actual computation, carry out coefficient correction to avoid deviation.
7. method according to claim 1, the cities and towns rainwash water yield adopts the total rainfall amount first calculating town-wide, calculate according to the ratio of Initial Runoff, cities and towns Pollution Load of Urban Surface Runoff amount adopts and calculates by the water yield and concentration or calculate according to specific load method again.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112942230A (en) * | 2021-01-21 | 2021-06-11 | 中城(广州)城乡规划设计有限公司 | Urban artificial lake water area value domain calculation method facing water pollution control |
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Application publication date: 20141217 |
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