Spatial site selection analysis method and device for sewage treatment station

Abstract

The present invention discloses a method and device for spatial site selection of a sewage treatment station, the method comprising: dividing the optional range of construction land into multiple spatial units, using a site selection analysis evaluation system including various factors related to site selection analysis, using hierarchical analysis software to calculate the weights of the various factors in a group decision expert data aggregation manner to form a factor weight matrix, wherein the factors include conditional factors and dynamic correction evaluation factors; retrieving factor data corresponding to the factors from a basic geographic information spatial database, and standardizing the factor data; substituting the standardized factor data and the factor weight matrix into a site selection analysis formula to obtain a suitability index for setting up a sewage treatment station in each spatial unit. The present invention quantifies various factors, evaluates the suitability of spatial units, and coordinates the spatial site selection of sewage treatment stations in multiple natural villages and the prediction of their construction scale.

Description

Technical Field

[0001] The present invention relates to the field of geographic information technology, and in particular to a method and device for spatial site selection analysis of a sewage treatment station. Background Art

[0002] Domestic sewage treatment in natural villages has the characteristics of dispersed sources, large fluctuations in water quality and water volume, and limited regional living standards and technical levels. Most of them adopt decentralized sewage treatment systems, that is, small and medium-sized sewage treatment stations are built in a relatively small area, generally based on natural villages. The treatment scale of sewage treatment stations is mostly within 10-200 tons, and generally does not require long-distance transportation and multi-stage lifting. The advantages are flexible construction methods, short construction period, and low construction difficulty; low investment and reduced pipe network construction costs; conducive to the reuse of reclaimed water and improved water resource utilization. The disadvantages are that there are many stations and the total operating cost is relatively high; the total investment is large, the land area is large, and it is difficult to form economies of scale; the impact on the surrounding environment is large, affecting the development and construction of the region; sludge treatment and disposal are difficult; water quality and water volume vary greatly, which is not conducive to the operation of sewage treatment equipment.

[0003] Therefore, scientifically selecting the spatial location for domestic sewage treatment stations in natural villages and choosing the construction scale according to local conditions are the key to achieving affordable construction, use and good management of domestic sewage treatment in natural villages. At present, there is no reasonable and scientific method for the spatial location of sewage treatment stations. Summary of the invention

[0004] In order to solve the above problems, the present invention discloses a method for spatial site selection of a sewage treatment station, which is used to select a site for each natural village in a village area to determine the location of the sewage treatment station. The village area refers to an area including multiple natural villages. The method comprises:

[0005] The optional range of construction land is divided into multiple spatial units, and the weights of the factors are calculated by using a group decision expert data aggregation method according to a site selection analysis evaluation system including various factors related to the site selection analysis to form a factor weight matrix, wherein the factors include conditional factors and dynamic correction evaluation factors;

[0006] From the basic geographic information spatial database, retrieve the factor data corresponding to the factor and perform standardization on the factor data;

[0007] Substitute the standardized factor data and factor weight matrix into the site selection analysis formula to obtain the suitability index for setting up a sewage treatment station in each spatial unit.

[0008] The site selection analysis formula is as follows:

[0009]

[0010] Vy It represents the suitability index of setting up a sewage treatment plant in a spatial unit;

[0011] X i Represents the standardized value of the i-th factor data in the site selection analysis and evaluation system;

[0012] BV i Represents the weight value of the i-th factor in the factor weight matrix;

[0013] n means there are n factors.

[0014] Optionally, after obtaining the suitability index for setting up sewage treatment stations in each spatial unit, a scheme combination is formed for all natural villages and different locations of sewage treatment stations, and then the design data of sewage treatment coverage rate, sewage treatment station load rate and total sewage treatment capacity are combined to compare and select schemes from the scheme combination to determine the optimal recommended site selection plan.

[0015] Optionally,

[0016] The formula for determining the total sewage treatment capacity of all sewage treatment plants is as follows:

[0017]

[0018] w y , represents the total sewage treatment capacity of all sewage treatment plants;

[0019] T i Represents the total designed sewage treatment volume of the i-th sewage treatment station;

[0020] M i Represents the investment cost of the construction of the i-th sewage treatment station;

[0021] F i represents the load rate of the i-th sewage treatment station;

[0022] D i [xy] represents the sewage treatment demand of the i-th sewage treatment station at the spatial coordinate value [xy];

[0023] H i Represents the operating cost of the i-th sewage treatment station.

[0024] Optionally, the suitability index is integrated into the vector surface data, and the vector surface to vector point tool in the GIS software platform is used to determine the spatial coordinate set of the sewage treatment station.

[0025] Optionally, various condition factors include factors corresponding to transportation access time, infrastructure conditions, service coverage requirements, and natural environment conditions; and the dynamically revised evaluation factors include the natural village planning type and economic development level in the superior planning.

[0026] Optionally, the factors are divided into positive impact and negative impact, where the positive impact factors include: road network density, drainage network density, service coverage population, safety isolation distance, project address conditions, wind conditions, natural village planning type in the upper planning, and economic development level.

[0027] The normalization formula of positive impact factor data is:

[0028]

[0029] Negative influencing factors include: the time it takes to walk from a natural village to a sewage treatment station, the time it takes to drive from a natural village to a sewage treatment station,

[0030] The negative impact factor data standardization formula is:

[0031]

[0032] X i Represents the original factor layer data;

[0033] X represents the factor layer data after being processed by the standardized formula;

[0034] X max Represents the maximum value of the original factor layer data;

[0035] X min Represents the minimum value of the original factor layer data.

[0036] Optionally, a set of qualitative comments is also established to represent the spatial position of the suitability index within the spatial unit over the optional range of construction land.

[0037] Optionally, before dividing the optional scope of construction land into a plurality of spatial units, according to the site selection analysis evaluation system including various factors related to the site selection analysis, weight calculation of the various factors is performed by group decision-making expert data aggregation using hierarchical analysis software, and before establishing the factor weight matrix, the following is further included:

[0038] Collect land resource data including land, population, roads, environment, pipeline network and industry in the village, and establish a basic geographic information spatial database;

[0039] In the basic geographic information spatial database, the area after removing the planned land is designated as the optional scope for the construction of sewage treatment plants.

[0040] The present invention also provides a spatial site selection device for a sewage treatment station, which is used to select a site for each natural village in a village area to determine the location of the sewage treatment station. The village area refers to an area containing multiple natural villages, including:

[0041] A weight determination module is used to divide the optional range of construction land into multiple spatial units, and calculate the weights of various factors related to the site selection analysis according to the site selection analysis evaluation system, using the group decision expert data aggregation method to form a factor weight matrix, wherein the factors include conditional factors and dynamic correction evaluation factors;

[0042] The standardization processing module is used to retrieve the factor data corresponding to the factor from the basic geographic information spatial database and perform standardization processing on the factor data;

[0043] The suitability evaluation module is used to substitute the standardized factor data and factor weight matrix into the site selection analysis formula to obtain the suitability index of setting up sewage treatment stations in each spatial unit.

[0044] The site selection analysis formula is as follows:

[0045]

[0046] V y It represents the suitability index of setting up a sewage treatment plant in a spatial unit;

[0047] X i Represents the standardized value of the i-th factor data in the site selection analysis and evaluation system;

[0048] BV i Represents the weight value of the i-th factor in the factor weight matrix;

[0049] n means there are n factors.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. Comprehensively consider various factors in the spatial site selection analysis process of natural village domestic sewage treatment stations, quantify each factor, establish a mathematical model, and evaluate the suitability of spatial units.

[0052] 2. Correlate the spatial unit suitability evaluation results of the sewage treatment station with the simulated operation cost of the sewage treatment station, comprehensively consider the cost of simulated operation of the sewage treatment station under different spatial unit suitabilities, and compare multiple site selection options.

[0053] 3. Different from the spatial site selection analysis and construction scale forecast of domestic sewage treatment stations in a single natural village, multiple natural villages with domestic sewage treatment needs within the village area are regarded as a whole, and the relationship between sewage treatment needs between adjacent natural villages is considered to coordinate the spatial site selection and construction scale forecast of domestic sewage treatment stations in multiple natural villages. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] The above-mentioned features and technical advantages of the present invention will become clearer and easier to understand by describing its embodiments in conjunction with the following drawings.

[0055] Figure 1 is a flow chart showing a spatial site selection method according to an embodiment of the present invention;

[0056] Figure 2 is a site selection analysis and evaluation system representing an embodiment of the present invention;

[0057] Figure 3 is a schematic diagram showing the expression of spatial location suitability on the optional range of construction land in an embodiment of the present invention;

[0058] Figure 4 is a schematic diagram showing a scheme comparison of an embodiment of the present invention;

[0059] Figure 5 Schematic diagram showing the optimal recommended site selection scheme according to an embodiment of the present invention. DETAILED DESCRIPTION

[0060] The embodiments of the present invention will be described below with reference to the accompanying drawings. It will be appreciated by those skilled in the art that the described embodiments may be modified in various ways or combinations thereof without departing from the spirit and scope of the present invention. Therefore, the drawings and descriptions are illustrative in nature and are not intended to limit the scope of the claims. In addition, in this specification, the drawings are not drawn to scale and the same reference numerals represent the same parts.

[0061] Figure 1 is a flow chart of the method for selecting a location for a sewage treatment plant in this embodiment. Figure 1 The method for selecting a sewage treatment station space location of the present invention is used to select a location for a sewage treatment station for each natural village in the village area, and the method comprises the following steps:

[0062] Step S1, collect the available land resource data of the village, such as land, population, roads, environment, pipeline network, industry, etc., and establish a basic geographic information spatial database. The village refers to an area containing multiple natural villages.

[0063] Step S2, in the basic geographic information spatial database, the area after removing the national land planning land according to the national land space planning is demarcated as the optional scope of land for sewage treatment station construction, and the national land planning land includes permanent basic farmland, forest land, roads, homesteads, etc.

[0064] Step S3, divide the optional scope of construction land into multiple spatial units, for example, the optional scope of construction land can be divided into spatial units to be evaluated in the form of a license replacement grid. Each spatial unit is used to evaluate whether it is suitable for arranging a sewage treatment plant. Figure 2 The site selection analysis evaluation system shown includes various factors related to site selection analysis and establishes a factor weight matrix.

[0065] The factors include the walking time from the natural village to the sewage treatment station, the driving time from the natural village to the sewage treatment station, the road network density, the drainage network density, the service coverage population, the coverage population, the safety isolation distance, the safety isolation distance, the project address conditions, the wind conditions, the natural village planning type in the superior planning, and the economic development level.

[0066] Since the site selection and construction of natural village sewage treatment stations is not only a top-down government public service decision-making behavior, but also closely related to the practical improvement of the lives of farmers in natural villages, and at the same time, it also involves a strong technical field, with both the authority of administrative policies and the requirements of people's livelihood and technical support. Therefore, a questionnaire was prepared based on the site selection analysis and evaluation system, and the scores of experts such as government administrative departments, village representatives, design and construction units, construction and operation units, and relevant scholars from colleges and universities were used as the main data sources to calculate the weight values ​​of each evaluation index. The calculation process uses the group decision expert data aggregation method in the hierarchical analysis software (yaahp) to calculate the weight of each index.

[0067] After calculation, the weights are as shown in Table 1, and the factor weight matrix BV is established. For example, the data in Table 1 (B1=0.06, B2=0.04, B3=0.06, B4=0.14, B5=0.12, B6=0.1, B7=0.08, B8=0.1, B9=0.2, V1=0.18, V2=0.02).

[0068] Among them, BV i Represents the weight value of the i-th factor in the factor weight matrix BV.

[0069] Table 1

[0070]

[0071] Step S4, retrieve the factor data involved in the factor layer from the basic geographic information spatial database, and divide the factors into positive influence and negative influence. Since the data are multi-source and heterogeneous, they cannot be directly used for spatial analysis research. The factor data can be standardized using the extreme value method.

[0072] Positive influencing factors include: road network density, drainage network density, service coverage population, safety isolation distance, project address conditions, wind conditions, natural village planning type in the superior planning, and economic development level.

[0073] The normalization formula of positive impact factor data is:

[0074]

[0075] Negative influencing factors include: the time it takes to walk from a natural village to a sewage treatment station and the time it takes to drive from a natural village to a sewage treatment station.

[0076] The negative impact factor data standardization formula is:

[0077]

[0078] X i represents the original factor data;

[0079] X represents the factor data after being processed by the standardized formula;

[0080] X max Represents the maximum value of the original factor data;

[0081] X min Represents the minimum value of the original factor data.

[0082] Step S5, establishing a qualitative comment set for the sewage treatment station according to its adaptability to achieve its predetermined goals in a specific spatial location. For example, the adaptability can be composed of the following four levels of qualitative comments: qualitative comment set D = {high, relatively high, medium, low}.

[0083] Step S6, substitute the standardized factor data and factor weights into the site selection analysis formula to calculate the suitability index of each spatial unit for setting up a sewage treatment station. The suitability index is combined with the qualitative comment set D to obtain the suitability evaluation result, and the suitability evaluation result is expressed in spatial position on the optional range of construction land, including the optional range of construction land expressed in spatial position, such as Figure 3 shown.

[0084] The site selection analysis formula is as follows:

[0085]

[0086] V y It represents the suitability index of setting up a sewage treatment plant in a spatial unit;

[0087] X i Represents the standardized value of the i-th factor data in the site selection analysis and evaluation system;

[0088] BV i Represents the weight value of the i-th factor in the factor weight matrix.

[0089] Among them, the site selection can be further combined with the set site selection principles, for example, located in the downwind direction of the dominant wind direction in summer, with good engineering geological conditions, located at the end of the village drainage, convenient for the collection, discharge, reuse and transportation of sewage sludge, without affecting the surrounding ecological environment and landscape, meeting flood control requirements and having good drainage conditions, etc. It should be noted that this is a technical means that can be implemented by technicians in this field according to subjective needs, and will not be described in detail here.

[0090] Step S7, determine multiple sites for each natural village based on the suitability evaluation results of the spatial unit. For example, all spatial units with high qualitative comments can be used as the location of the sewage treatment station. Such a natural village may correspond to multiple suitable locations for arranging sewage treatment stations. All natural villages and different locations of sewage treatment stations are combined into a scheme combination, and then the design data of sewage treatment coverage, sewage treatment station load rate, and total sewage treatment capacity are combined to compare the schemes from the scheme combination.

[0091] More specifically, the spatial position is organically combined with the sewage treatment coverage rate and the load rate of the sewage treatment station based on the suitability index of the spatial unit, the designed treatment tonnage of the sewage treatment station, the simulated operating cost, and the spatial coordinate set of multiple sewage treatment stations in the spatial unit. This can achieve both the maximum sewage treatment service coverage and the reasonable load rate of the sewage treatment station. The total treatment tonnage of multiple sewage treatment stations is within the total sewage treatment capacity, thereby determining the optimal recommended site selection plan.

[0092] The formula for determining the total sewage treatment capacity of all sewage treatment plants is as follows:

[0093]

[0094] w y Represents the total sewage treatment capacity of all sewage treatment plants;

[0095] T i Represents the total designed sewage treatment volume of the i-th sewage treatment station;

[0096] M i represents the investment in the construction of the i-th sewage treatment station;

[0097] F i represents the load rate of the i-th sewage treatment station;

[0098] D i [xy] represents the sewage treatment demand of the i-th sewage treatment station at the spatial coordinate value [xy];

[0099] H i Represents the operating cost of the i-th sewage treatment station.

[0100] like Figure 4 As shown in the figure, in the three schemes, the layout locations of the sewage treatment plants in natural villages 1#, 2#, 3#, and 4# are different. The design data of each sewage treatment plant are as follows: Figure 4 As shown in the middle, the comprehensive sewage treatment design data of natural villages 1#, 2#, 3#, and 4# are shown on the right side of the figure. The optimal recommended site selection plan is comprehensively selected based on the sewage treatment coverage rate, total sewage treatment capacity, and sewage treatment station load rate. Obviously, Plan 1 is better.

[0101] Furthermore, the suitability evaluation results are integrated into the vector area data, and the data management tools-feature-feature to point tool in the ArcToolbox tool set of the ArcGIS software platform is used to take the spatial units in the suitability evaluation results that meet the requirements as the conversion elements; for example Figure 5 In the figure, a natural village after removing the low-suitability spatial unit is a vector surface, with a total of four vector surfaces, and the four vector surfaces are "transformed from surface to point"; each vector surface has one and only one vector point generated, which represents the optimal location coordinate value of the sewage station within the natural village. Determine the set of spatial coordinate values ​​of the sewage treatment station, with a total of four location coordinate values ​​N1, N2, N3, and N4 for natural villages 1#, 2#, 3#, and 4#.

[0102] Step S8: output the optimal recommended site selection plan.

[0103] In addition, the present application also provides a sewage treatment station spatial site selection device, which is used to select a site for each natural village in a village area to determine the location of the sewage treatment station. The village area refers to an area containing multiple natural villages, including:

[0104] A weight determination module is used to divide the optional range of construction land into multiple spatial units, and calculate the weights of various factors related to the site selection analysis according to the site selection analysis evaluation system, using the group decision expert data aggregation method to form a factor weight matrix, wherein the factors include conditional factors and dynamic correction evaluation factors;

[0105] The standardization processing module is used to retrieve the factor data corresponding to the factor from the basic geographic information spatial database and perform standardization processing on the factor data;

[0106] The suitability evaluation module is used to substitute the standardized factor data and factor weight matrix into the site selection analysis formula to obtain the suitability index of setting up sewage treatment stations in each spatial unit.

[0107] The site selection analysis formula is as follows:

[0108]

[0109] V y It represents the suitability index of setting up a sewage treatment plant in a spatial unit;

[0110] X i Represents the standardized value of the i-th factor data in the site selection analysis and evaluation system;

[0111] BV i Represents the weight value of the i-th factor in the factor weight matrix;

[0112] n means there are n factors.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for selecting a spatial location for a sewage treatment plant, characterized in that: For determining the location of a sewage treatment station for each natural village in a village area, wherein the village area refers to an area including multiple natural villages, the method includes: Divide the optional scope of construction land into multiple spatial units, and calculate the weights of various factors related to the site selection analysis by using a site selection analysis evaluation system and a group decision expert data aggregation method to form a factor weight matrix, wherein the factors include conditional factors and dynamic correction evaluation factors; From the basic geographic information spatial database, retrieve the factor data corresponding to the factor and perform standardization on the factor data; Substitute the standardized factor data and factor weight matrix into the site selection analysis formula to obtain the suitability index for setting up a sewage treatment station in each spatial unit. The site selection analysis formula is as follows: V y It represents the suitability index of setting up a sewage treatment plant in a spatial unit; X j Represents the value of the j-th factor data in the site selection analysis and evaluation system after standardized processing; BV j Represents the weight value of the jth factor in the factor weight matrix; m means there are m factors, A qualitative comment set is established based on the adaptability of the sewage treatment station to achieve the predetermined goals. After obtaining the suitability index of setting up the sewage treatment station in each spatial unit, the suitability index is combined with the qualitative comment set to obtain the suitability evaluation result. According to the suitability evaluation result of the spatial unit, multiple sites are determined for each natural village. All natural villages and different locations of sewage treatment stations are combined to form a scheme combination. Then, combined with the design data of sewage treatment coverage rate, sewage treatment station load rate, and total sewage treatment capacity, the schemes are compared from the scheme combination to determine the best recommended site selection scheme. The formula for determining the total sewage treatment capacity of all sewage treatment plants is as follows: w y Represents the total sewage treatment capacity of all sewage treatment plants; T i represents the total designed sewage treatment volume of the i-th sewage treatment station; M i Represents the investment cost of the construction of the i-th sewage treatment station; F i represents the load rate of the i-th sewage treatment station; D i [xy] represents the sewage treatment demand of the i-th sewage treatment station at the spatial coordinate value [xy]; H i represents the operating cost of the i-th sewage treatment station; n means there are n sewage treatment plants.

2. The method for selecting a spatial location for a sewage treatment plant according to claim 1, characterized in that: The suitability index is integrated into the vector surface data, and the vector surface to vector point tool in the GIS software platform is used to determine the spatial coordinate set of the sewage treatment station.

3. The method for selecting a spatial location for a sewage treatment plant according to claim 1, characterized in that: The various condition factors include the time required for transportation, infrastructure conditions, service coverage requirements, and factors corresponding to natural environmental conditions. The dynamically revised evaluation factors include the natural village planning type and economic development level in the superior planning.

4. The method for selecting a spatial location for a sewage treatment plant according to claim 1, characterized in that: The factors are divided into positive and negative impacts, among which the positive impact factors include: road network density, drainage network density, service coverage population, safety isolation distance, project address conditions, wind conditions, natural village planning types in the upper planning, and economic development level. The normalization formula of positive impact factor data is: Negative influencing factors include: the time it takes to walk from a natural village to a sewage treatment station, the time it takes to drive from a natural village to a sewage treatment station, The negative impact factor data standardization formula is: X i Represents the original factor layer data; X represents the factor layer data after being processed by the standardized formula; X max Represents the maximum value of the original factor layer data; X min Represents the minimum value of the original factor layer data.

5. The method for selecting a spatial location for a sewage treatment plant according to claim 1, characterized in that: After the optional scope of construction land is divided into multiple spatial units, according to the site selection analysis evaluation system including various factors related to the site selection analysis, the weight calculation of the factors is performed by group decision-making expert data aggregation using hierarchical analysis software, and before the factor weight matrix is ​​established, it also includes: Collect land resource data including land, population, roads, environment, pipeline network and industry in the village, and establish a basic geographic information spatial database; In the basic geographic information spatial database, the area after removing the planned land is designated as the optional scope for the construction of sewage treatment plants.

6. A spatial site selection device for a sewage treatment station, used to select a site for each natural village in a village area to determine the location of the sewage treatment station, wherein the village area refers to an area including multiple natural villages, characterized in that: include: A weight determination module is used to divide the optional range of construction land into multiple spatial units, and calculate the weights of various factors related to the site selection analysis according to the site selection analysis evaluation system, using the group decision expert data aggregation method to form a factor weight matrix, wherein the factors include conditional factors and dynamic correction evaluation factors; The standardization processing module is used to retrieve the factor data corresponding to the factor from the basic geographic information spatial database and perform standardization processing on the factor data; The suitability evaluation module is used to substitute the standardized factor data and factor weight matrix into the site selection analysis formula to obtain the suitability index of setting up sewage treatment stations in each spatial unit. The site selection analysis formula is as follows: V y It represents the suitability index of setting up a sewage treatment plant in a spatial unit; X j Represents the value of the j-th factor data in the site selection analysis and evaluation system after standardized processing; BV j Represents the weight value of the jth factor in the factor weight matrix; m means there are m factors, A qualitative comment set is established based on the adaptability of the sewage treatment station to achieve the predetermined goals. After obtaining the suitability index of setting up the sewage treatment station in each spatial unit, the suitability index is combined with the qualitative comment set to obtain the suitability evaluation result. According to the suitability evaluation result of the spatial unit, multiple sites are determined for each natural village. All natural villages and different locations of sewage treatment stations are combined to form a scheme combination. Then, combined with the design data of sewage treatment coverage rate, sewage treatment station load rate, and total sewage treatment capacity, the schemes are compared from the scheme combination to determine the best recommended site selection scheme. The formula for determining the total sewage treatment capacity of all sewage treatment plants is as follows: w y Represents the total sewage treatment capacity of all sewage treatment plants; T i represents the total designed sewage treatment volume of the i-th sewage treatment station; M i Represents the investment cost of the construction of the i-th sewage treatment station; F i represents the load rate of the i-th sewage treatment station; D i [xy] represents the sewage treatment demand of the i-th sewage treatment station at the spatial coordinate value [xy]; H i represents the operating cost of the i-th sewage treatment station, n means there are n sewage treatment plants.

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