# US 2023/0054713 A1 · Method for determining contribution rate of pollution load in water quality assessment section of annular river network system based on water quantity constitute

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- Number: US 2023/0054713 A1
- Document ID: US20230054713A1
- Status: Published application
- Kind: A1
- Application number: 17/809,399
- Filed: 2022-06-28
- Published: 2023-02-23
- Earliest claimed: 2021-08-16
- Assignees: Hohai University
- Applicants: Hohai University
- Inventors: Peng WANG; Yixin MA; Zulin HUA
- Web page: https://patentgrep.com/patent/US20230054713A1

## CPC

- G06Q 50/26: Government or public services (business processes related to the transportation industry G06Q50/40)
- G01N 33/18: Water
- Y02A 20/152: Water filtration
- Y02A 20/20: Controlling water pollution; Waste water treatment
- G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

A method for determining a contribution rate of pollution load in a water quality assessment section of an annular river network system based on water quantity constitute comprises the following steps: defining all water quantity components (rainfall, pollution discharge and water diversion) according to a water quantity source condition of a river network water system in a research region; calculating a water quantity ratio of each water quantity component in each water quality assessment section; collecting flow rate of point source pollution and corresponding pollutant discharge amount, calculating a water quantity weighted average concentration of all point source pollutants, and calculating a runoff rate and a pollution load of all land use types and an average concentration of non-point source pollutants by utilizing a hydrological model and a pollution load model; and calculating the contribution rate of pollution load in the water quality assessment section.

## Claims

### Claim 1

A method for determining a contribution rate of pollution load in a water quality assessment section of an annular river network system based on water quantity constitute, comprising the following steps of:
i) determining water quantity components in a research region, comprising a plurality of rainfall runoffs, wastewater discharge and water diversion;
ii) constructing a river network water quantity constitute model, regarding the all water quantity components as conservative substances, and calculating water quantity ratios of the water quantity components in each water quality assessment section, wherein a construction method of the river network water quantity constitute model comprises: based on a water quality model, regarding the all water quantity components as the conservative substances, regardless of transformation and fate, and representing model results as volume ratios of all water quantity components, wherein n rivers are set, corresponding flow rates of rivers L1, L2, . . . , Ln-1 are q1, q2, . . . , qn-1 respectively, and the n−1 rivers all flow to the river Ln, which means that a water quantity of the river Ln is composed of water quantity of the rivers L1, L2, . . . , Ln-1, so that a flow rate of Ln is that q=q1+q2+, . . . , +qn-1, and ratios of the water quantity are L1: q1/q, L2: q2/q, . . . Ln-1: qn-1/q respectively; and assuming that concentrations of the conservative substances entering the river with the water flow are all 1.0, concentrations of the all conservative substances in the river Ln are L1: q1/q, L2: q2/q, . . . , Ln-1: qn-1/q respectively; and determining the water quantity ratios of the all water quantity components according to the concentrations of the conservative substances in the river;
iii) collecting pollution loads and wastewater quantity of all wastewater discharges, and calculating a weighted average concentration of all wastewater discharge pollutants; using a hydrological model and a pollution load model to calculate a pollution load, a wastewater quantity and a water yield of land use types of all rainfall runoffs, and calculate a weighted average concentration of rainfall runoff pollutants; and acquiring a weighted average concentration of water diversion pollutants;
iv) according to the water quantity ratios of the all water quantity components and the weighted average concentration of the pollutants, calculating contribution rates of the pollutants of the all water quantity components in the water quality assessment section in the research region;
v) according to the calculation in step iv), obtaining a list of contribution rates of pollution loads of all water quantity components; and
vi) according to the list of contribution rates of pollution loads obtained in step v), ranking the contribution rates of all water quantity components in the water quality assessment section, sequentially determining whether the weighted average concentrations of pollutants exceed a pollutant discharge standard, and if the weighted average concentrations exceed a standard threshold, then constructing sewage treatment devices to control pollution discharge concentrations of the water quantity components; and if the weighted average concentrations do not exceed the standard threshold, then controlling discharge amounts of the water quantity components.

### Claim 2 (depends on 1)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 1, wherein in the step ii), meteorological conditions of precipitation and evaporation and land use conditions in the research region are input into the hydrological model to calculate runoff rates of all land use types, and the water yields of the land uses are taken as the water quantity components of the rainfall runoff; collected wastewater discharge quantity are taken as the water quantity components of the wastewater discharge; and water diversion quantity outside the research region are taken as the water quantity components of the water diversion; and
the water quantity ratio of each water quantity component in the water quality assessment section is calculated by the water quantity constitute model, which is ϕtj, and ϕtj is a water quantity ratio of an ith water quantity component in a jth water quality assessment section.

### Claim 3 (depends on 1)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 1, wherein in the step i), the rainfall runoff is defined as a non-point source and the wastewater discharge is defined as a point source, the non-point source is classified into domestic pollution of rural residents, planting pollution, livestock and poultry pollution and urban surface runoff pollution; and the point source is classified into direct discharge industrial pollution, wastewater treatment plant pollution and other untreated domestic pollution.

### Claim 4 (depends on 2)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 2, wherein in the step iii), the weighted average concentration of the non-point source pollutants is calculated according to a total load rate of non-point source pollutant divided by a flow rate of wastewater and a runoff rate of all land uses; the weighted average concentration of the point source pollutant is calculated according to a total load rate of all point source pollutant divided by the corresponding flow rate of wastewater;
a calculation formula is:
C
i
_
=
∑
i
=
1
m
WL
i
∑
i
=
1
m
W
i
×
100
(
1
)
wherein Ci is a weighted average concentration of pollutants of an ith water quantity component, mg/L; WLi is a pollutant load rate of the it water quantity component, t/a, which is collected from data or calculated by the pollution load model; Wi is a flow rate of the ith water quantity component, 10,000 m3/a, which is collected from data or predicted by the hydrological model; and m is a number of pollution classifications of the non-point source and the point source, wherein 4 non-point sources and 3 point sources are provided.

### Claim 5 (depends on 1)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 1, wherein in step iii), the weighted average concentration of the water diversion pollutants is determined by water quality monitoring data.

### Claim 6 (depends on 2)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 2, wherein in step iii), the weighted average concentration of the water diversion pollutants is determined by water quality monitoring data.

### Claim 7 (depends on 3)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 3, wherein in step iii), the weighted average concentration of the water diversion pollutants is determined by water quality monitoring data.

### Claim 8 (depends on 4)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 4, wherein in step iii), the weighted average concentration of the water diversion pollutants is determined by water quality monitoring data.

### Claim 9 (depends on 1)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 1, wherein in step iv), a calculation method of the contribution rates of the pollutants of the all water quantity components in the water quality assessment section in the research region is:
P
i
j
=
ϕ
i
j
·
C
i
_
∑
i
=
1
n
ϕ
i
j
·
C
i
_
(
2
)
wherein Ptj is a contribution rate of load of the pollutants of the ith, water quantity component in the jth water quality assessment section; ϕtj is the water quantity ratio of the ith water quantity component in the jth water quality assessment section; Ci is the weighted average concentration of the pollutants of the ith water quantity component, mg/L; and n is a number of the water quantity components.

### Claim 10 (depends on 2)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 2, wherein in step iv), a calculation method of the contribution rates of the pollutants of the all water quantity components in the water quality assessment section in the research region is:
P
i
j
=
ϕ
i
j
·
C
i
_
∑
i
=
1
n
ϕ
i
j
·
C
i
_
(
2
)
wherein Ptj is a contribution rate of load of the pollutants of the ith water quantity component in the jth water quality assessment section; ϕtj is the water quantity ratio of the ith water quantity component in the jth water quality assessment section; Ci is the weighted average concentration of the pollutants of the ith water quantity component, mg/L; and n is a number of the water quantity components.

### Claim 11 (depends on 3)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 3, wherein in step iv), a calculation method of the contribution rates of the pollutants of the all water quantity components in the water quality assessment section in the research region is:
P
i
j
=
ϕ
i
j
·
C
i
_
∑
i
=
l
n
ϕ
i
j
·
C
i
_
(
2
)
wherein Ptj is a contribution rate of load of the pollutants of the ith water quantity component in the jth water quality assessment section; ϕtj is the water quantity ratio of the ith water quantity component in the jth water quality assessment section; Ci is the weighted average concentration of the pollutants of the ith water quantity component, mg/L; and n is a number of the water quantity components.

### Claim 12 (depends on 4)

The method for determining the contribution rate of pollution load in the water quality assessment section of the annular river network system based on water quantity constitute according to claim 4, wherein in step iv), a calculation method of the contribution rates of the pollutants of the all water quantity components in the water quality assessment section in the research region is:
P
i
j
=
ϕ
i
j
·
C
i
_
∑
i
=
l
n
ϕ
i
j
·
C
i
_
(
2
)
wherein Ptj is a contribution rate of load of the pollutants of the ith water quantity component in the jth water quality assessment section; ϕtj is the water quantity ratio of the ith water quantity component in the jth water quality assessment section; Ci is the weighted average concentration of the pollutants of the ith water quantity component, mg/L; and n is a number of the water quantity components.