Calculation method for plastic consumption in marine culture stage of seaweed

Abstract

The invention belongs to the technical field of environment evaluation, and particularly relates to a method for calculating the plastic dosage in the marine culture stage of seaweed. The method comprises the following steps: firstly, determining an accounting boundary of a seaweed culture system, limiting a calculation range as a mariculture stage, and systematically identifying plastic products such as ropes, floating balls, floating foam boxes, plastic bottles, PVC pipes, anti-fish nets, plastic ribbons and the like which are directly used for mariculture activities; secondly, collecting basic data such as seaweed varieties, culture methods, culture sea area information and specifications, materials and putting amounts of various plastic components; thirdly, respectively constructing a weight calculation model according to the structural characteristics of different types of plastic products; and further, summarizing the masses of various plastic components to obtain the total plastic dosage in the mariculture stage. According to the invention, standardized and refined accounting of the seaweed mariculture plastic investment can be realized, and a scientific basis is provided for plastic pollution prevention and control, management optimization and sustainable development of the seaweed culture industry.

Description

Technical Field

[0001] This invention belongs to the field of environmental assessment technology, specifically relating to a method for calculating the amount of plastic used in the marine aquaculture stage of seaweed. Background Technology

[0002] As a marine biological resource with both ecological and economic value, seaweed is being used in a wide range of applications worldwide. It is not only a high-quality aquatic feed ingredient and a nutritious food for humans, but also a core raw material for bioenergy, medicine and health care, and food additives. Furthermore, it plays a key role in ecological restoration such as carbon sequestration and emission reduction and mitigating marine eutrophication.

[0003] However, with the large-scale expansion of the global seaweed aquaculture industry, the irregular discharge of plastic products during the aquaculture process has exacerbated marine pollution. Seaweed aquaculture relies on plastic products such as ropes, buoys, plastic bottles, fishing nets, and PVC pipes to construct the marine growth platform. These materials are exposed to the complex marine environment of seawater and waves for extended periods, making them prone to aging, wear, and breakage, directly increasing the risk of marine ecological pollution. Currently, there is no standardized system for calculating plastic usage in seaweed aquaculture, and a lack of differentiated calculation methods for different plastic products leads to significant deviations in plastic usage assessments, failing to provide a scientific basis for precise prevention and control of plastic pollution from seaweed aquaculture.

[0004] Therefore, there is an urgent need to develop a method specifically for calculating plastic usage during the marine aquaculture stage of seaweed farming, so as to achieve accurate quantification of plastic consumption in marine aquaculture. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a method for accurately calculating plastic usage that focuses on marine aquaculture scenarios, considers the practical needs of different aquaculture methods, and provides precise calculations. By clarifying the marine aquaculture process, standardizing data collection, and defining calculation methods, this method achieves the scientific quantification of plastic usage under various marine aquaculture scenarios. This method is designed for large-scale seaweed aquaculture activities, systematically identifying and measuring various plastic products used during the aquaculture process to achieve standardized accounting and traceable management of plastic inputs.

[0006] The specific technical solution of the present invention is as follows:

[0007] A method for calculating the amount of plastic used in the marine aquaculture of seaweed, the steps of which are as follows:

[0008] Step (1) Determine the system boundary:

[0009] This method is strictly limited to the seaweed aquaculture stage and only includes plastic products directly used in aquaculture activities, such as ropes, buoys, plastic bottles, floating foam boxes, PVC pipes, fishing nets, and plastic strips. This method is only applicable to these components. If other plastic parts are used in the aquaculture method, a weight factor needs to be added and the calculation should be carried out according to the actual situation.

[0010] Step (2) Data Acquisition:

[0011] Basic information on marine aquaculture includes seaweed species, aquaculture methods, and the latitude and longitude range of the aquaculture area. Information on marine plastic products includes the type of plastic product (e.g., ropes, buoys, plastic bottles, etc.), specifications (e.g., rope diameter, buoy volume, net area, etc.), weight coefficient (e.g., weight per unit, weight per square meter, etc.), material (e.g., PE, PP, PVC, PET, etc.), and the amount deployed at sea (e.g., length, number, area, etc.).

[0012] Step (3) Calculation of rope weight:

[0013] Different diameters ( (Unit: mm) Rope weight Calculate according to formula (1).

[0014] (1)

[0015] in, For diameter is The length of the rope, in units of Rope weight factor It is expressed as weight per 100 meters, that is, the weight of the rope corresponding to a standard length of 100 meters. It is used to reflect the weight distribution characteristics of the material on the length scale. The weight coefficient is different for ropes of different diameters.

[0016] Step (4) Calculation of the weight of the float, floating foam box, plastic bottle, and plastic strip:

[0017] Weight coefficient of buoys, floating foam boxes, plastic bottles, and plastic strips All by individual weight This indicates that the weight of this type of plastic product, measured in units, can be calculated according to formula (2). .

[0018] (2)

[0019] in, Plastic products The weight, in units of pieces.

[0020] Step (5) Calculation of the weight of the fishing net:

[0021] Fishing nets are made of rope, so the area of ​​the net needs to be converted into the length of the rope for calculation. The required data includes the net area. and the size of the mesh Then the number of mesh This can be expressed as formula (3):

[0022] (3)

[0023] Since most meshes are square, the perimeter of the mesh is... (Unit: m) is:

[0024] (4)

[0025] Furthermore, the total length of the ropes used for the fishing net is calculated using formula (5). (Unit: m):

[0026] (5)

[0027] Finally, the weight of the fishing net can be calculated by referring to the rope usage formula (6). (Unit: kg)

[0028] (6)

[0029] in, It is the weight of 100 meters of 1mm thick nylon rope, and the value is taken as 0.076kg / 100m.

[0030] Step (6) Calculation of the weight of the PVC pipe:

[0031] During the aquaculture process, some of the aquaculture framework structures are supported by PVC pipes, and the weight coefficient of the PVC pipes is... Values The mass of the PVC pipe can be calculated according to formula (7). .

[0032] (7)

[0033] in, This is the weight coefficient for PVC pipes. This refers to the length of the PVC pipe.

[0034] Step (7) Calculation of plastic usage:

[0035] For plastic components such as ropes, buoys, floating foam boxes, PVC pipes, plastic bottles, plastic strips, and fishnets, further calculate the amount of plastic used during the marine aquaculture stage. :

[0036] (8)

[0037] Step (8) Result Analysis:

[0038] This invention combines calculation results to comprehensively evaluate plastic input in seaweed cultivation. Optionally, this invention can introduce Monte Carlo simulation to analyze the uncertainty of key parameters, thereby obtaining the probability distribution of plastic usage results, and proposing optimization suggestions based on the results.

[0039] (1) A standardized calculation system applicable to various species, multiple aquaculture models, and multiple sea areas has been established, taking into full account the impact of the marine environment on the loss of plastic products, so as to realize the refined and differentiated accounting of plastic usage in marine aquaculture.

[0040] (2) The proposed marine aquaculture plastic coefficient index provides a unified standard for assessing the amount of plastic used in global seaweed marine aquaculture, and provides a scientific basis for pollution prevention and control, policy formulation and sustainable development of the marine aquaculture industry. Attached Figure Description

[0041] Figure 1 This is a schematic diagram illustrating the calculation process for plastic usage during the seaweed aquaculture stage. Detailed Implementation

[0042] The specific embodiments of the present invention will now be further described below with reference to the accompanying drawings:

[0043] This invention aims to achieve quantitative accounting of plastic inputs during the seaweed aquaculture stage. The basic process is as follows: Figure 1 As shown. First, according to the system boundaries defined in implementation step 1, only plastic products directly used in marine aquaculture activities are included in the accounting scope, including but not limited to ropes, buoys, plastic bottles, floating foam boxes, PVC pipes, fishing nets, and plastic strips.

[0044] Based on step 2, this invention standardizes the requirements for data collection, requiring the acquisition of basic information such as seaweed species, aquaculture methods, and latitude and longitude of aquaculture areas, as well as component information such as plastic product type, specifications, material category, and actual quantity released, to form a complete input parameter system.

[0045] Furthermore, based on formulas (1) to (7), this invention constructs methods for calculating the weight of typical plastic components such as ropes, buoys, plastic bottle products, anti-fishing nets, and PVC pipes. Specifically, the weight calculation for ropes of different diameters is based on their weight coefficient (weight per 100 meters), combined with the corresponding rope deployment length to obtain their mass; for products measured in pieces, such as buoys, floating foam boxes, plastic bottles, and plastic strips, the weight is calculated based on the unit weight coefficient and the deployment quantity; for anti-fishing nets, the number of meshes is estimated by their area and mesh size, then converted to the required total rope length based on the mesh circumference, and finally the net mass is obtained using the rope weight coefficient; the mass of PVC pipes is determined based on their unit length mass and deployment length.

[0046] According to step 8, the present invention further summarizes the mass of the above-mentioned plastic components to obtain the total amount of plastic used in the seaweed marine aquaculture stage.

[0047] Based on the above calculations, this invention introduces Monte Carlo simulation to quantify the uncertainty of key parameters and obtain the probability distribution characteristics of plastic usage. This method can identify the sensitivity of different components in aquaculture scenarios to total plastic input, providing a scientific basis for plastic consumption control and aquaculture structure optimization.

[0048] Taking a wakame seaweed farming company as an example, this company uses raft aquaculture to cultivate wakame seaweed, with a cultivation area of ​​667 square meters. Basic information on the plastic products used is shown in the table below; data that could not be collected is indicated as blank.

[0049]

[0050] According to formula (1), the amounts of 4mm, 10mm, 22mm, and 24mm ropes used are 1.53, 12.76, 20.80, and 42.00 kg, respectively. According to formula (2), the amount of float used is 81.00 kg. Since there is no additional input of plastic products, formula (8) is used directly to calculate the total amount used, and the uncertainty of the total amount used is simulated, thus obtaining that the farm used a total of 159.46 (4.63; [151.89, 167.12]) kg of plastic.

Claims

1. A method for calculating the amount of plastic used in the seaweed mariculture stage, characterized by, The steps are as follows: Step (1) Determine the system boundary: The system boundary is defined as the seaweed mariculture stage, and only plastic products directly used for mariculture activities are counted, including ropes, buoys, plastic bottles, floating foam boxes, PVC pipes, fish protection nets, and plastic tapes for mariculture; Step (2) Data collection: Mariculture basic information includes seaweed varieties, mariculture methods, and the latitude and longitude range of the mariculture area; plastic product information includes plastic product type, specification, weight coefficient, material, and the amount of plastic used for mariculture; Step (3) Calculation of rope weight: Different diameters Rope weight Calculated according to equation (1); (1)； wherein is the length of the rope in meters, and is the diameter of the rope in meters, and is the weight coefficient of the rope in kg / m, and is the weight of the rope in kg per 100 m. Step (4) Calculation of buoy, floating foam box, plastic bottle, and plastic tape weight: Weight factor for floating ball, floating foam box, plastic bottle, plastic bale All expressed in individual weights, wherein, The weight of such plastic articles measured in number is calculated according to formula (2) : (2) ； wherein, plastic articles the weight of the plastic articles, in units of pieces; Step (5) Calculation of fish protection net weight: The area of the anti-fish net is converted into the length of the rope to calculate. The data required to be obtained include the net area and the size of the mesh , then the number of meshes is expressed as formula (3): (3) ； Mesh circumference Is: (4) ； Further, the total length of the rope used for the fish protection net is calculated using equation (5) : (5) ； Finally, the weight of the anti-fish net is calculated by referring to the rope consumption formula (6) : (6) ； wherein, is the weight of 100 meters of 1 mm thick nylon rope; Step (6) Calculation of PVC pipe weight: The PVC pipe quality is calculated according to formula (7) ; (7) ； wherein, is the weight factor for PVC pipe, is the length of the PVC pipe; Step (7) Calculation of plastic usage: For ropes, buoys, floating foam boxes, PVC pipes, plastic bottles, plastic tapes, and fish protection net components, further calculate the plastic usage during the mariculture stage: (8) ； Step (8) Result analysis: Based on the calculation results, comprehensively evaluate the plastic input during the seaweed cultivation process.

2. A method of calculating the amount of plastic used in the seaweed farming stage according to claim 1, characterized in that, In step (8), introduce Monte Carlo simulation to analyze the uncertainty of key parameters, obtain the probability distribution of the plastic usage results, and propose optimization suggestions based on the results.

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