Method for supervising and quantifying pollution discharge risk of pollution discharge port entering river

Abstract

The invention discloses a method for supervising and quantifying pollution discharge risks of sewage outlets entering a river, belongs to the technical field of supervision methods, and aims to solve the problems that the number of sewage outlets is large, the management difficulty is high, and a traditional detection and analysis method is high in cost and long in consumed time. The characteristic distribution and numerical form of six indexes such as pollution characteristics, water body state parameters, sensory indexes, spatial distribution parameters, environmental element parameters and suspected sewage types of the sewage draining exit in the river are researched; and analyzing and identifying to obtain the correlation and weight coefficient between the pollution characteristic index and other five influence factors and the evaluation coefficient of the corresponding mark item, and constructing a model, so that the rapid measurement and calculation of the pollution discharge risk of the checked pollution discharge port can be realized. According to the method, the manpower and material resource cost caused by traditional monitoring can be greatly reduced, the result feedback speed is increased, and technical support is provided for graded and classified supervision and treatment of the sewage draining exit.

Description

Technical Field

[0001] The present invention relates to a supervision method, in particular to a quantitative method for supervising pollution discharge risks at sewage outlets into rivers, and belongs to the technical field of supervision methods. Background Art

[0002] Sewage outlets are the main channels for pollutants generated in the production and life process of human beings to enter the environment. The upstream of the sewage outlet is connected to human production and life, food, clothing, housing and transportation, and the downstream is connected to the main places where rivers, lakes and oceans depend on for survival and reproduction.

[0003] The discharge characteristics of sewage outlets directly affect the water ecological environment of the river basin. Scientific management of sewage outlets remains an important way to continuously improve the water ecological environment quality of the river basin.

[0004] As my country's ecological civilization construction continues to advance, the goal of river basin water ecological environment governance has expanded from the original single factor to the coordinated management of water resources, water ecology, water environment, water culture, and water safety, which has put forward higher requirements for improving the quality of river basin water ecological environment.

[0005] The current supervision of sewage outlets still faces problems such as unclear pollution sources, unclear sewage discharge paths, and insufficient coordination and integration of relevant systems.

[0006] Although traditional methods of detecting and analyzing water pollutants are highly accurate, they involve multiple links such as sample collection, circulation, preservation and laboratory analysis. They are usually costly, have long cycles and are limited by many factors such as the location of the sewage outlet and drainage conditions. This makes it difficult for traditional detection and analysis methods to efficiently respond to the current requirements of water pollution control and water ecological environment management for fast feedback and low management costs.

[0007] Therefore, a quantitative method for risk management of sewage discharge into rivers was designed to solve the above problems. Summary of the invention

[0008] The main purpose of the present invention is to provide a quantitative method for monitoring the risk of sewage discharge from sewage outlets into rivers.

[0009] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0010] The quantitative method for risk management of sewage discharge into rivers includes the following steps:

[0011] Step 1: Randomly obtain pollution data of sewage outlets into the river through on-site observation and monitoring;

[0012] Step 2: Establish the attribute index of the sewage outlet into the river based on the pollution data of the sewage outlet into the river;

[0013] Step 3: Use the comprehensive factor evaluation method to quantify the attribute indicators of the sewage outlets into the river, establish the comprehensive pollution index value of the sewage outlets into the river and the pollution index value of the sewage outlets into the river corresponding to each marker item;

[0014] Step 4: Use partial least squares method to analyze and calculate the weight index of each attribute index of the sewage outlet into the river in the pollution index of the sewage outlet into the river;

[0015] Step 5: Use the fuzzy comprehensive evaluation method and construct a discharge risk index model for the sewage outlet based on the weight index in the pollution index of the sewage outlet into the river;

[0016] Step 6: Test the risk index of the sewage outlet into the river based on the model and the weight index in the pollution index of the sewage outlet into the river.

[0017] Preferably, the attribute indicators of sewage outlets into rivers include drainage status indicators, sensory indicators, sewage source indicators, surrounding environmental factor indicators, geographical location indicators and water quality pollution indicators.

[0018] Preferably, the sensory index marking items include black odor, oil stains, foam, pungent, yellow-green, different colors, floating, clear water, and turbidity; The indicators of sewage sources include surface runoff, park green space, agricultural mixed discharge, farmland drainage, construction site drainage, aquaculture, tourism facilities, port drainage, urban life, livestock and poultry breeding, rainwater and sewage mixed discharge, groundwater seepage, industrial wastewater, rainwater confluence, rural life, and sewage facilities; The indicators of surrounding environmental factors include dry land, parks, paddy fields, mountain forests, railways, natural coastlines, ports and docks, ponds, river islands, construction sites, highways, bridges, residential areas, roads, industrial areas, and villages; The geographical location indicator marking items include inter-drainage outlets, other outlets, inter-drainage ditches, direct discharge outlets, direct discharge rivers, and direct discharge ditches; Water quality pollution index markers include chemical oxygen demand, ammonia nitrogen, total phosphorus and n characteristic pollution factors.

[0023] Preferably, in step three, a comprehensive factor evaluation method is used to calculate the comprehensive pollution index value of the sewage outlet into the river;

[0024] The comprehensive factor evaluation method is based on chemical oxygen demand, ammonia nitrogen, total phosphorus and n characteristic pollution factors as dependent variables, where n∈natural number;

[0025] It is calculated using the following formula:

[0026]

[0027] Among them, P c is the pollution index of sewage outlets into the river;

[0028] P iis the water pollution index of pollutant i;

[0029] n is the number of pollutants involved in the evaluation;

[0030] C i is the characteristic concentration value of pollutant i;

[0031] C s is the maximum allowable concentration threshold of pollutant i, in mg·L -1；

[0032] The maximum allowable concentration threshold is determined specifically based on relevant water quality protection or management limits.

[0033] Preferably, in step 4, the partial least squares regression classification method is used to calculate the weight index value b of each attribute index of the sewage outlet into the river in the pollution index of the sewage outlet into the river k , using the following formula:

[0034]

[0035] y=a1x1+a2x2+…+a k x k ,(k=1,2,…,n);

[0036] Among them, a k It is the coefficient of n influencing factors in the multivariate regression equation obtained by fitting and calculating through the partial least squares regression classification method;

[0037] x k and y are the influencing factor pollution index and sewage outlet pollution index standardized by the z-scores method, respectively.

[0038] Preferably, in step five, a fuzzy comprehensive evaluation method is used to calculate the risk index of the sewage outlet into the river;

[0039] The evaluation coefficient matrix formula is:

[0040] S=Β×R

[0041]

[0042] R=[r1 r2…r k ];

[0043] Among them, r k The membership function of preferably uses the trapezoidal distribution function as the operator;

[0044]

[0045] Among them, P kj It is the pollution index of the jth marker item of the kth type of influencing factor of the sewage outlet;

[0046] P (kj)c It is the pollution index of all sewage outlets with the jth marker item of the kth type of influencing factor.

[0047] Preferably, in step 6, when the risk index P value of the sewage outlet into the river is less than 1, it is a low risk;

[0048] When the P value is between 1 and 5, it is considered as medium risk;

[0049] When the P value is greater than 5, it indicates high risk.

[0050] Beneficial technical effects of the present invention:

[0051] The quantitative method for risk supervision of sewage discharge at river outlets provided by the present invention studies the characteristic distribution and numerical form of the pollution index of the river outlet and its water state parameters, sensory index, spatial distribution parameters, environmental factor parameters, and suspected sewage types through on-site investigation and statistical analysis, analyzes the correlation between the pollution index and the other five indexes, identifies the weight coefficients of the five influencing factors and the evaluation coefficients of the corresponding marking items, provides an indicator framework for the classification and grading of sewage outlets and risk assessment, and uses the fuzzy comprehensive evaluation method to verify the rationality of each parameter at the same time. The sewage discharge characteristics of the sewage outlet are usually closely related to factors such as its distribution location, surrounding environmental factors, suspected pollution sources, and sewage discharge status. By identifying and establishing a quantitative relationship model between each factor type and the sewage discharge characteristics of the sewage outlet, the sewage discharge characteristics of the sewage outlet are evaluated by calculating the sewage outlet pollution index. This has the advantages of low cost and short cycle, and provides target targeting for the classification and daily management of sewage outlets. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 The present invention is a schematic diagram of a method flow chart of a preferred embodiment of a method for quantifying the risk of sewage discharge into a river according to the present invention.

[0053] Figure 2 The present invention is a flow chart of a preferred embodiment of the method for quantifying the risk of sewage discharge into a river according to the present invention. DETAILED DESCRIPTION

[0054] In order to make the technical solution of the present invention more clear and specific to those skilled in the art, the present invention is further described in detail below in conjunction with embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0055] like Figure 1-Figure 2 As shown, the method for quantifying the risk of sewage discharge into a river provided in this embodiment includes the following steps:

[0056] Step 1: Randomly obtain pollution data of sewage outlets into the river through on-site observation and monitoring;

[0057] Step 2: Establish the attribute index of the sewage outlet into the river based on the pollution data of the sewage outlet into the river;

[0058] Step 3: Use the comprehensive factor evaluation method to quantify the attribute indicators of the sewage outlets into the river, establish the comprehensive pollution index value of the sewage outlets into the river and the pollution index value of the sewage outlets into the river corresponding to each marker item;

[0059] Step 4: Use partial least squares method to analyze and calculate the weight index of each attribute index of the sewage outlet into the river in the pollution index of the sewage outlet into the river;

[0060] Step 5: Use the fuzzy comprehensive evaluation method and construct a discharge risk index model for the sewage outlet based on the weight index in the pollution index of the sewage outlet into the river;

[0061] Step 6: Test the risk index of the sewage outlet into the river based on the model and the weight index in the pollution index of the sewage outlet into the river.

[0062] In this embodiment, the attribute indicators of the sewage outlet into the river include drainage status indicators, sensory indicators, sewage source indicators, surrounding environmental factor indicators, geographical location indicators and water quality pollution indicators.

[0063] In this embodiment, the sensory index marking items include black and odor, oil stains, foam, pungent, yellow-green, different colors, floating, clear water, and turbidity; The indicators of sewage sources include surface runoff, park green space, agricultural mixed discharge, farmland drainage, construction site drainage, aquaculture, tourism facilities, port drainage, urban life, livestock and poultry breeding, rainwater and sewage mixed discharge, groundwater seepage, industrial wastewater, rainwater confluence, rural life, and sewage facilities; The indicators of surrounding environmental factors include dry land, parks, paddy fields, mountain forests, railways, natural coastlines, ports and docks, ponds, river islands, construction sites, highways, bridges, residential areas, roads, industrial areas, and villages; The geographical location indicator marking items include inter-drainage outlets, other outlets, inter-drainage ditches, direct discharge outlets, direct discharge rivers, and direct discharge ditches; Water quality pollution index markers include chemical oxygen demand, ammonia nitrogen, total phosphorus and n characteristic pollution factors.

[0068] In this embodiment, in step three, a comprehensive factor evaluation method is used to calculate the comprehensive pollution index value of the sewage outlet into the river;

[0069] The comprehensive factor evaluation method is based on chemical oxygen demand, ammonia nitrogen, total phosphorus and n characteristic pollution factors as dependent variables, where n∈natural number;

[0070] It is calculated using the following formula:

[0071]

[0072] Among them, P c is the pollution index of sewage outlets into the river;

[0073] P i is the water pollution index of pollutant i;

[0074] n is the number of pollutants involved in the evaluation;

[0075] C i is the characteristic concentration value of pollutant i;

[0076] C s is the maximum allowable concentration threshold of pollutant i, in mg·L -1；

[0077] The maximum allowable concentration threshold is determined specifically based on relevant water quality protection or management limits.

[0078] Based on the comprehensive factor evaluation method, the pollution-related index of the three-level marking items corresponding to the five types of factors and three types of influencing factors is determined as shown in the following table:

[0079]

[0080]

[0081] In this embodiment, in step 4, the partial least squares regression classification method is used to calculate the weight index value b of each attribute index of the sewage outlet into the river in the pollution index of the sewage outlet into the river k , using the following formula:

[0082]

[0083] y=a1x1+a2x2+…+a k x k ,(k=1,2,…,n);

[0084] Among them, a k It is the coefficient of n influencing factors in the multivariate regression equation obtained by fitting and calculating through the partial least squares regression classification method;

[0085] x k and y are the influencing factor pollution index and sewage outlet pollution index standardized by the z-scores method, respectively.

[0086] In this embodiment, in step five, a fuzzy comprehensive evaluation method is used to calculate the risk index of the sewage outlet into the river;

[0087] The evaluation coefficient matrix formula is:

[0088] S=Β×R

[0089]

[0090] R=[r1 r2…r k ];

[0091] Among them, r k The membership function of preferably uses the trapezoidal distribution function as the operator;

[0092]

[0093] Among them, P kj It is the pollution index of the jth marker item of the kth type of influencing factor of the sewage outlet;

[0094] P (kj)c It is the pollution index of all sewage outlets with the jth marker item of the kth type of influencing factor.

[0095] In this embodiment, in step 6, when the risk index P value of the sewage outlet into the river is less than 1, it is a low risk;

[0096] When the P value is between 1 and 5, it is considered as medium risk;

[0097] When the P value is greater than 5, it indicates high risk.

[0098] The above description is only a further embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and concepts of the present invention within the scope disclosed by the present invention, which belong to the protection scope of the present invention.

Claims

1. A quantitative method for monitoring the risk of sewage discharge into a river, characterized by: The steps include: Step 1: Randomly obtain pollution data of sewage outlets into the river through on-site observation and monitoring; Step 2: Establish the attribute index of the sewage outlet into the river based on the pollution data of the sewage outlet into the river; Step 3: Use the comprehensive factor evaluation method to quantify the attribute indicators of the sewage outlets into the river, establish the comprehensive pollution index value of the sewage outlets into the river and the pollution index value of the sewage outlets into the river corresponding to each marker item; Step 4: Use partial least squares method to analyze and calculate the weight index of each attribute index of the sewage outlet into the river in the pollution index of the sewage outlet into the river; Step 5: Use the fuzzy comprehensive evaluation method and construct a discharge risk index model for the sewage outlet based on the weight index in the pollution index of the sewage outlet into the river; Step 6: Test the risk index of the sewage outlet into the river based on the model and the weight index in the pollution index of the sewage outlet into the river.

2. A method for quantifying the risk of sewage discharge into a river according to claim 1, characterized in that: Attribute indicators of sewage outlets into rivers include drainage status indicators, sensory indicators, sewage source indicators, surrounding environmental factor indicators, geographical location indicators and water pollution indicators.

3. A method for quantifying the risk of sewage discharge into a river according to claim 2, characterized in that: Sensory index marking items include black odor, oil stains, foam, pungent, yellow-green, different colors, floating, clear water, and turbidity; The indicators of sewage sources include surface runoff, park green space, agricultural mixed discharge, farmland drainage, construction site drainage, aquaculture, tourism facilities, port drainage, urban life, livestock and poultry breeding, rainwater and sewage mixed discharge, groundwater seepage, industrial wastewater, rainwater confluence, rural life, and sewage facilities; The indicators of surrounding environmental factors include dry land, parks, paddy fields, mountain forests, railways, natural coastlines, ports and docks, ponds, river islands, construction sites, highways, bridges, residential areas, roads, industrial areas, and villages; The geographical location indicator marking items include inter-drainage outlets, other outlets, inter-drainage ditches, direct discharge outlets, direct discharge rivers, and direct discharge ditches; Water quality pollution index markers include chemical oxygen demand, ammonia nitrogen, total phosphorus and n characteristic pollution factors.

4. A method for quantifying the risk of sewage discharge into a river according to claim 1, characterized in that: In step 3, the comprehensive factor evaluation method is used to calculate the comprehensive pollution index value of the sewage outlet into the river; The comprehensive factor evaluation method is based on chemical oxygen demand, ammonia nitrogen, total phosphorus and n characteristic pollution factors as dependent variables, where n∈natural number; It is calculated using the following formula: Among them, P c is the pollution index of sewage outlets into the river; P i is the water pollution index of pollutant i; n is the number of pollutants involved in the evaluation; C i is the characteristic concentration value of pollutant i; C s is the maximum allowable concentration threshold of pollutant i, in mg·L -1 ; The maximum allowable concentration threshold is determined specifically based on relevant water quality protection or management limits.

5. The method for quantifying the risk of sewage discharge into a river according to claim 1 is characterized by: In step 4, the partial least squares regression classification method is used to calculate the weight index value b of each attribute index of the sewage outlet into the river in the pollution index of the sewage outlet into the river k , using the following formula: y=a1x1+a2x2+…+a k x k ,(k=1,2,…,n); Among them, a k It is the coefficient of n influencing factors in the multivariate regression equation obtained by fitting and calculating through the partial least squares regression classification method; x k and y are the influencing factor pollution index and sewage outlet pollution index standardized by the z-scores method, respectively.

6. A method for quantifying the risk of sewage discharge into a river according to claim 5, characterized in that: In step five, the fuzzy comprehensive evaluation method is used to calculate the risk index of the sewage outlet into the river; The evaluation coefficient matrix formula is: S=Β×R R＝[r1 r2…r k ]； Among them, r k The membership function of preferably uses the trapezoidal distribution function as the operator; Among them, P kj It is the pollution index of the jth marker item of the kth type of influencing factor of the sewage outlet; P (kj)c It is the pollution index of all sewage outlets with the jth marker item of the kth type of influencing factor.

7. A method for quantifying the risk of sewage discharge into a river according to claim 6, characterized in that: In step 6, when the risk index P value of the sewage outlet into the river is less than 1, it is a low risk; When the P value is between 1 and 5, it is considered as medium risk; When the P value is greater than 5, it indicates high risk.

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