Evaluation method of rural domestic sewage treatment equipment

Abstract

The invention provides an evaluation method of rural domestic sewage treatment equipment, which comprises the following steps: constructing a multi-level evaluation index system of the rural domestic sewage treatment equipment according to the requirements of a rural domestic sewage treatment project; the multi-level evaluation index system comprises a plurality of evaluation indexes, criterion layer indexes, first-level indexes corresponding to the criterion layer indexes and second-level indexes corresponding to the first-level indexes; determining a relative weight value of each index according to the relative importance degree of the indexes in the same level; and constructing an evaluation model of the rural domestic sewage treatment equipment, and determining a comprehensive evaluation result of each rural domestic sewage treatment equipment based on the evaluation model and the secondary index evaluation value of each rural domestic sewage treatment equipment, so as to provide important reference for selection of sewage treatment equipment in a rural domestic sewage treatment project.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to an evaluation method for rural domestic sewage treatment equipment. Background Art

[0002] Integrated sewage treatment equipment has become the main method of treating domestic sewage in rural areas in my country due to its small footprint, short construction period and suitable for dispersed layout. However, due to the diversity of sewage treatment processes, there are many integrated sewage treatment equipment with different processes and types on the market. How to evaluate different sewage treatment equipment fairly, objectively and reasonably to provide an important reference for the purchase of rural domestic sewage equipment is a research gap at present. Summary of the invention

[0003] In view of the above shortcomings of the prior art, the purpose of the present invention is to provide an evaluation method for rural domestic sewage treatment equipment, which constructs a multi-level evaluation system for sewage treatment equipment from two aspects: treatment effect and economic cost, and provides a scientific reference for the purchase of rural domestic sewage treatment equipment.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides an evaluation method for rural domestic sewage treatment equipment, which includes the following steps:

[0005] According to the requirements of rural domestic sewage treatment projects, a multi-level evaluation index system for rural domestic sewage treatment equipment is constructed; the multi-level evaluation index system includes: criterion layer indicators, first-level indicators corresponding to each criterion layer indicator, and second-level indicators corresponding to each first-level indicator;

[0006] Determine the relative weight of each indicator based on the relative importance of indicators at the same level;

[0007] An evaluation model for rural domestic sewage treatment equipment is constructed, and the comprehensive evaluation results of each rural domestic sewage treatment equipment are determined based on the evaluation model and the secondary indicator evaluation values ​​of each rural domestic sewage treatment equipment.

[0008] Preferably, there are two criterion layer indicators, which are treatment effect and economic cost respectively.

[0009] Preferably, the first-level indicator corresponding to the treatment effect is the water quality compliance rate; the first-level indicators corresponding to the economic cost include equipment purchase cost, infrastructure cost, maintenance cost and operation cost.

[0010] Preferably, the secondary indicators corresponding to the effluent compliance rate include the ammonia nitrogen compliance rate, the total nitrogen compliance rate and the total phosphorus compliance rate; the secondary indicator corresponding to the equipment purchase cost is the equipment purchase price; the secondary indicator corresponding to the infrastructure cost is the infrastructure cost per ton of water; the secondary indicators corresponding to the maintenance cost include the number of operation and maintenance contents and the operation and maintenance frequency; the secondary indicators corresponding to the operating cost include the electricity consumption per ton of water and the drug consumption per ton of water.

[0011] Preferably, the evaluation model includes a comprehensive target model, a criterion layer evaluation model and a first-level evaluation model; the second-level indicator evaluation value and the relative weight value of the second-level indicator are input into the first-level evaluation model to obtain the first-level indicator evaluation value; the first-level indicator evaluation value and the relative weight value of the first-level indicator are input into the criterion layer evaluation model to obtain the criterion layer indicator evaluation value; the criterion layer indicator evaluation value and the relative weight value of the criterion layer indicator are input into the comprehensive target model to obtain a comprehensive evaluation result; the comprehensive target model is:

[0012] Y=A1×Y1+A2×Y2 (Formula 1)

[0013] Where: Y is the comprehensive evaluation result; Y1 and Y2 are the treatment effect evaluation value and economic cost evaluation value respectively; A1 and A2 are the relative weight values ​​of the treatment effect and the relative weight values ​​of the economic cost respectively;

[0014] The criterion layer evaluation model is:

[0015]

[0016] In the formula, y 11 ,y 21 ,y 22 ,y 23 ,y 24 They are the evaluation value of water quality compliance rate, equipment purchase cost, infrastructure cost, maintenance cost, and operating cost respectively; A 21 , A 22 , A 23 , A 24 They are the relative weight values ​​of equipment purchase cost, capital construction cost, maintenance cost and operation cost;

[0017] The first-level evaluation model is:

[0018]

[0019] In the formula, y 111 ,y 112 ,y 113 ,y 211 ,y 221 ,y 231 ,y 232 ,y241 ,y 242 They are the ammonia nitrogen compliance rate evaluation value, total nitrogen compliance rate evaluation value, total phosphorus compliance rate evaluation value, equipment purchase price evaluation value, infrastructure cost per ton of water evaluation value, operation and maintenance content quantity evaluation value, operation and maintenance frequency evaluation value, electricity consumption per ton of water evaluation value and drug consumption per ton of water evaluation value; A 111 , A 112 , A 113 , A 211 , A 221 , A 231 , A 232 , A 241 , A 242 They are respectively the relative weight value of ammonia nitrogen compliance rate, the relative weight value of total nitrogen compliance rate, the relative weight value of total phosphorus compliance rate, the relative weight value of equipment purchase price, the relative weight value of infrastructure cost per ton of water, the relative weight value of the number of operation and maintenance contents, the relative weight value of operation and maintenance frequency, the relative weight value of electricity consumption per ton of water and the relative weight value of pesticide consumption per ton of water.

[0020] Preferably, for the quantitative indicator, the secondary indicator evaluation value is a secondary indicator standard evaluation value, which is obtained based on the secondary indicator original evaluation value of each rural domestic sewage treatment equipment.

[0021] Preferably, the relative weight value of each indicator is determined by combining expert scoring method with analytic hierarchy process.

[0022] As described above, the evaluation method of a rural domestic sewage treatment equipment of the present invention has the following beneficial effects:

[0023] Based on the characteristics of rural domestic sewage treatment projects, combined with expert opinions and relevant literature, the present invention constructs a multi-level evaluation system for sewage treatment equipment from the two aspects of treatment effect and economic cost, and uses the hierarchical analysis method to determine the relative weight value of indicators at each level. At the same time, the evaluation value of each indicator is standardized based on the same evaluation standard, so as to obtain a comprehensive score for each rural domestic sewage treatment equipment, providing a scientific means for the evaluation of rural domestic sewage treatment equipment, in order to provide an important reference for the selection of sewage treatment equipment in rural domestic sewage treatment projects. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is the rural domestic sewage treatment equipment evaluation system of the present invention. DETAILED DESCRIPTION

[0025] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0026] See also Figure 1. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0027] An embodiment of the present invention provides an evaluation method for rural domestic sewage treatment equipment, the evaluation method comprising the following steps:

[0028] S1. According to the requirements of rural domestic sewage treatment projects, a multi-level evaluation index system for rural domestic sewage treatment equipment is constructed; wherein the multi-level evaluation index system includes: criterion layer indicators, first-level indicators corresponding to each criterion layer indicator, and second-level indicators corresponding to each first-level indicator;

[0029] The selection of rural domestic sewage treatment equipment should not only consider the treatment effect of the technology, but also the investment of funds. Therefore, according to the characteristics of pre-treatment of rural domestic sewage in a rural domestic sewage treatment project, the economic conditions of the region, combined with expert opinions and relevant literature, the treatment effect and economic cost are used as the criterion layer of the evaluation index system; the effluent compliance rate is used as the first-level indicator of the treatment effect criterion layer, and the equipment purchase cost, capital construction cost, maintenance cost, and operating cost are used as the first-level indicator of the economic cost criterion layer; the ammonia nitrogen compliance rate, total nitrogen compliance rate, and total phosphorus compliance rate are used as the second-level indicator of the effluent compliance rate, the equipment purchase price is used as the second-level indicator of the equipment purchase cost, the capital construction cost per ton of water is used as the second-level indicator of the capital construction cost, the number of operation and maintenance contents and the operation and maintenance frequency are used as the second-level indicator of the maintenance cost, and the electricity consumption per ton of water and the drug consumption per ton of water are used as the second-level indicator of the operating cost. The following is constructed: Figure 1 The multi-level evaluation index system of rural domestic sewage treatment equipment is shown.

[0030] S2. Determine the relative weight of each indicator based on the relative importance of indicators at the same level;

[0031] The weight of the indicator has an important influence on the final evaluation result. If there is only one indicator in the next layer corresponding to a certain indicator, the relative weight value of the indicator in the next layer corresponding to the indicator is 1; if there are no less than two indicators in the next layer corresponding to a certain indicator, then according to the 1-9 scale method proposed by Sauty, the expert scoring method is used to compare and score each indicator in the criterion layer, the first-level indicator layer and the second-level indicator layer to construct the judgment matrix of each level, and then the weight of each indicator in the same level relative to the corresponding indicator in the previous level is calculated based on the hierarchical analysis method, and the consistency test is performed. Since the determination of relative weight values ​​by the hierarchical analysis method is an existing technology, it will not be repeated. The final calculation results of the relative weights of each indicator relative to the indicators in the previous level and the absolute weight values ​​of the second-level indicators are shown in Table 1.

[0032] Table 1 Calculation results of weights of each indicator

[0033]

[0034] S3. Construct an evaluation model for rural domestic sewage treatment equipment, and determine the comprehensive evaluation results of each rural domestic sewage treatment equipment based on the evaluation model and the secondary indicator evaluation values ​​of each rural domestic sewage treatment equipment.

[0035] Specifically, the evaluation model includes a comprehensive target model, a criterion layer evaluation model and a first-level evaluation model; among which, the comprehensive target model is:

[0036] Y=A1×Y1+A2×Y2 (Formula 1)

[0037] Where: Y is the comprehensive evaluation result; Y1 and Y2 are the treatment effect evaluation value and economic cost evaluation value respectively; A1 and A2 are the relative weight values ​​of the treatment effect and the relative weight values ​​of the economic cost respectively;

[0038] The criterion layer evaluation model is:

[0039]

[0040] In the formula, y 11 ,y 21 ,y 22 ,y 23 ,y 24 They are the evaluation value of water quality compliance rate, equipment purchase cost, infrastructure cost, maintenance cost, and operating cost respectively; A 21 , A 22 , A 23 , A 24 They are the relative weight values ​​of equipment purchase cost, capital construction cost, maintenance cost and operation cost;

[0041] The first-level evaluation model is:

[0042]

[0043] In the formula, y 111 ,y 112 ,y 113 ,y 211 ,y 221 ,y 231 ,y 232 ,y 241 ,y 242 They are the ammonia nitrogen compliance rate evaluation value, total nitrogen compliance rate evaluation value, total phosphorus compliance rate evaluation value, equipment purchase price evaluation value, infrastructure cost per ton of water evaluation value, operation and maintenance content quantity evaluation value, operation and maintenance frequency evaluation value, electricity consumption per ton of water evaluation value and drug consumption per ton of water evaluation value; A 111 , A 112 , A 113 , A 211 , A 221 , A 231 , A 232 , A 241 , A 242 They are respectively the relative weight value of ammonia nitrogen compliance rate, the relative weight value of total nitrogen compliance rate, the relative weight value of total phosphorus compliance rate, the relative weight value of equipment purchase price, the relative weight value of infrastructure cost per ton of water, the relative weight value of the number of operation and maintenance contents, the relative weight value of operation and maintenance frequency, the relative weight value of electricity consumption per ton of water and the relative weight value of pesticide consumption per ton of water.

[0044] Input the secondary indicator evaluation value and the relative weight value of the secondary indicator into the primary evaluation model to obtain the primary indicator evaluation value; input the primary indicator evaluation value and the relative weight value of the primary indicator into the criterion layer evaluation model to obtain the criterion layer indicator evaluation value; input the criterion layer indicator evaluation value and the relative weight value of the criterion layer indicator into the comprehensive target model to obtain the comprehensive evaluation result of the corresponding rural domestic sewage treatment equipment; since the secondary indicator layer contains quantitative indicators and the units of each quantitative indicator are different, in order to facilitate unified evaluation, it is necessary to standardize the original indicator evaluation value (the original indicator evaluation value is generally obtained through measurement and calculation) and the evaluation criteria.

[0045] For positive quantitative indicators (i.e. benefit-type indicators) such as ammonia nitrogen compliance rate, total nitrogen compliance rate, and total phosphorus compliance rate, formula (4) is used to calculate the standard indicator evaluation value.

[0046] L ij =(c ij -c ijmin ) / (c ijmin -c ijmin ) Formula (4)

[0047] Where, Lij is the standard index evaluation value, satisfying 0≤b ij ≤1;c ij is the original evaluation value of the indicator; c ijmin 、c ijmax are the maximum and minimum values ​​of the original evaluation values ​​of the indicators, respectively.

[0048] For negative quantitative indicators (i.e., cost-type indicators) such as equipment purchase price and infrastructure cost per ton of water, formula (5) is used to calculate the standard indicator evaluation value.

[0049] L ij =(c ijmax -c ij ) / (c ijmax -c ijmin ) Formula (5)

[0050] Where, L ij is the standard index evaluation value, satisfying 0≤b ij ≤1;c ij is the original evaluation value of the indicator; c ijmin 、c ijmax are the maximum and minimum values ​​of the original evaluation values ​​of the indicators, respectively.

[0051] As rural domestic sewage treatment equipment is continuously used, the original index evaluation value will change. In order to improve the accuracy of the final evaluation result, it is necessary to obtain the original index evaluation value of each rural domestic sewage treatment equipment at different times within a preset time (generally 1 year), and obtain the standard index evaluation value of each rural domestic sewage treatment equipment at different times based on formula (4) or formula (5); then, the standard index evaluation value of each rural domestic sewage treatment equipment at different times is averaged to obtain the final standard evaluation value of each rural domestic sewage treatment equipment.

[0052] If the secondary indicator layer includes qualitative indicators, the qualitative indicators can be divided into 5 levels, and the corresponding evaluation values ​​of each level are 0.2, 0.4, 0.6, 0.8 and 1 respectively.

[0053] The final standard evaluation values ​​of the secondary indicator layer corresponding to each rural domestic sewage treatment equipment in this application are shown in Table 2.

[0054] Table 2 Final standard evaluation values ​​of each secondary indicator in each rural domestic sewage treatment equipment

[0055]

[0056] Substituting the data in Table 1 and Table 2 into equations (1) to (3), the comprehensive evaluation results of various rural domestic sewage treatment equipment are obtained as shown in Table 3.

[0057] Table 3 Comprehensive evaluation results of rural domestic sewage treatment equipment

[0058]

[0059] As can be seen from Table 1, equipment 1 has the highest comprehensive evaluation result and can be used as the equipment to be purchased for this rural domestic sewage treatment project.

[0060] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for evaluating rural domestic sewage treatment equipment, characterized in that: The evaluation method includes the following steps: According to the requirements of rural domestic sewage treatment projects, a multi-level evaluation index system for rural domestic sewage treatment equipment is constructed; the multi-level evaluation index system includes: criterion layer indicators, first-level indicators corresponding to each criterion layer indicator, and second-level indicators corresponding to each first-level indicator; Determine the relative weight of each indicator based on the relative importance of indicators at the same level; An evaluation model for rural domestic sewage treatment equipment is constructed, and the comprehensive evaluation results of each rural domestic sewage treatment equipment are determined based on the evaluation model and the secondary indicator evaluation values ​​of each rural domestic sewage treatment equipment.

2. The evaluation method of rural domestic sewage treatment equipment according to claim 1 is characterized in that: There are two criterion-level indicators, namely treatment effect and economic cost.

3. The evaluation method of rural domestic sewage treatment equipment according to claim 2 is characterized in that: The first-level indicator corresponding to the treatment effect is the water outlet compliance rate; the first-level indicators corresponding to the economic cost include equipment purchase costs, infrastructure costs, maintenance costs, and operating costs.

4. The evaluation method of rural domestic sewage treatment equipment according to claim 3 is characterized in that: The secondary indicators corresponding to the effluent compliance rate include the ammonia nitrogen compliance rate, the total nitrogen compliance rate and the total phosphorus compliance rate; the secondary indicator corresponding to the equipment purchase cost is the equipment purchase price; the secondary indicator corresponding to the infrastructure cost is the infrastructure cost per ton of water; the secondary indicators corresponding to the maintenance cost include the number of operation and maintenance contents and the operation and maintenance frequency; the secondary indicators corresponding to the operating cost include the electricity consumption per ton of water and the drug consumption per ton of water.

5. The evaluation method of rural domestic sewage treatment equipment according to claim 4 is characterized in that: The evaluation model includes a comprehensive target model, a criterion layer evaluation model and a first-level evaluation model; the second-level indicator evaluation value and the relative weight value of the second-level indicator are input into the first-level evaluation model to obtain the first-level indicator evaluation value; the first-level indicator evaluation value and the relative weight value of the first-level indicator are input into the criterion layer evaluation model to obtain the criterion layer indicator evaluation value; the criterion layer indicator evaluation value and the relative weight value of the criterion layer indicator are input into the comprehensive target model to obtain a comprehensive evaluation result; the comprehensive target model is: Y=A1×Y1+A2×Y2 (Formula 1) Where: Y is the comprehensive evaluation result; Y1 and Y2 are the treatment effect evaluation value and economic cost evaluation value respectively; A1 and A2 are the relative weight values ​​of the treatment effect and the relative weight values ​​of the economic cost respectively; The criterion layer evaluation model is: In the formula, y 11 ,y 21 ,y 22 ,y 23 ,y 24 They are the evaluation value of water quality compliance rate, equipment purchase cost, infrastructure cost, maintenance cost, and operating cost respectively; A 21 , A 22 , A 23 , A 24 They are the relative weight values ​​of equipment purchase cost, capital construction cost, maintenance cost and operation cost; The first-level evaluation model is: In the formula, y 111 ,y 112 ,y 113 ,y 211 ,y 221 ,y 231 ,y 232 ,y 241 ,y 242 They are the ammonia nitrogen compliance rate evaluation value, total nitrogen compliance rate evaluation value, total phosphorus compliance rate evaluation value, equipment purchase price evaluation value, infrastructure cost per ton of water evaluation value, operation and maintenance content quantity evaluation value, operation and maintenance frequency evaluation value, electricity consumption per ton of water evaluation value and drug consumption per ton of water evaluation value; A 111 , A 112 , A 113 , A 211 , A 221 , A 231 , A 232 , A 241 , A 242 They are respectively the relative weight value of ammonia nitrogen compliance rate, the relative weight value of total nitrogen compliance rate, the relative weight value of total phosphorus compliance rate, the relative weight value of equipment purchase price, the relative weight value of infrastructure cost per ton of water, the relative weight value of the number of operation and maintenance contents, the relative weight value of operation and maintenance frequency, the relative weight value of electricity consumption per ton of water and the relative weight value of pesticide consumption per ton of water.

6. The evaluation method of rural domestic sewage treatment equipment according to claim 1 is characterized in that: For quantitative indicators, the secondary indicator evaluation value is a secondary indicator standard evaluation value, which is obtained based on the secondary indicator original evaluation value of each rural domestic sewage treatment equipment.

7. The evaluation method for rural domestic sewage treatment equipment according to claim 1 is characterized in that: The method for determining the relative weight value of each indicator is: expert scoring method combined with hierarchical analysis method.

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