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Monitoring Case of Yiyang Livestock Tail Water Outdoor Monitoring Station in Hunan Province

Date: 2025-12-24Read: 1

Installation and commissioning case of GNST-SC1000 online monitoring equipment for Yiyang Livestock Tail Water Outdoor Monitoring Station in Hunan Province

1、 Project Background and Overview

（1） Project Background

Yiyang City in Hunan Province is an important aquaculture base in the province, with Taojiang County being a national demonstration zone for healthy and ecological aquaculture. The aquaculture area covers 45000 acres, and the total annual output of aquatic products exceeds 15000 tons. The local aquaculture wastewater mainly comes from pond intensive farming, factory farming and other processes, containing characteristic pollutants such as suspended solids, total phosphorus, total nitrogen, permanganate index, etc. If directly discharged, it can easily affect the ecological environment of surrounding waters. In order to implement the requirements of the "Emission Standards for Tailwater Pollutants in Aquaculture" (DB43/1752-2020) and promote the green and circular development of fisheries, a large-scale aquaculture base in Taojiang County, Yiyang City has set up outdoor monitoring stations at the tailwater discharge outlet and ecological purification pool outlet, equipped with GNST-SC1000 online multi parameter monitoring equipment. This device has the characteristics of IP68 high protection level, strong anti-interference ability, and high and low temperature resistance. It is equipped with an integrated GSM/GPRS modem, supports multi band communication, and can achieve 24-hour continuous monitoring and remote data transmission of core indicators such as suspended solids, total phosphorus, total nitrogen, and permanganate index. It is suitable for outdoor outdoor, water quality fluctuating, and complex environmental monitoring needs of aquaculture wastewater. The installation and debugging work is led by the technical team of Henan Suijing Environmental Protection Technology Co., Ltd., with the cooperation of the operation and maintenance department of the breeding base, to ensure the accurate docking of equipment with the tail water treatment process, guarantee the authenticity and effectiveness of monitoring data, and provide data support for the standard discharge of breeding tail water and regional water ecological protection.

（2） Core objective

Theoretical level: Enable trainees to understand the detection principle, core technical indicators, and national standard basis of GNST-SC1000 instrument, and clarify the applicable scenarios for testing different water quality indicators.
Practical level: Ensure that trainees are proficient in the entire process of instrument startup self check, parameter calibration, sample preparation and testing, data storage and export, and can independently complete the testing of typical water quality indicators.
Guarantee level: Master the common troubleshooting methods and daily maintenance points of instruments, extend the service life of instruments, and ensure the long-term stability and reliability of detection data.
Application level: To achieve deep integration of theory and scientific research practice, enhance the ability of trainees to use instruments to solve practical scientific research problems, and lay the foundation for the smooth progress of related environmental monitoring scientific research projects.
Standardized installation: Complete the outdoor layout of the GNST-SC1000 monitoring equipment host, sampling system, preprocessing device, power supply, and GPRS transmission module, ensuring that the installation complies with the "Technical Specifications for Installation of Online Monitoring Systems for Water Pollution Sources (COD? Cr?, NH? - N, etc.)" (HJ 353-2019) and the requirements for outdoor monitoring station construction.
Accurate debugging: Targeting the characteristics of large fluctuations in suspended solids content in aquaculture effluent and changes in water quality with the aquaculture cycle, precise calibration and performance testing of core indicators such as suspended solids, total phosphorus, total nitrogen, and permanganate index are completed to ensure that indicators such as indication error, repeatability, and 24-hour drift meet the standards.
System linkage: Ensure stable networking between GNST-SC1000 equipment and the supervision platform of Yiyang Agriculture and Rural Bureau and the intelligent fishery management platform of breeding bases, relying on its Modbus TCP communication protocol to achieve real-time uploading of monitoring data and normal response of abnormal warning functions, meeting the requirements of tail water supervision in breeding.
Long term guarantee: Develop a standardized installation and commissioning manual and operation points for GNST-SC1000 model that is suitable for outdoor aquaculture effluent monitoring, providing technical support for the long-term stable operation of equipment in complex outdoor environments.

2、 Training preparation

（1） Organizational Structure

1. Host: Environmental Science Research Center, Yangtze River Delta Research Institute, University of Electronic Science and Technology of China (Huzhou)

2. Supporting unit: Henan Suijing Environmental Protection Technology Co., Ltd

3. Training instructor: Supplier technical engineer (with rich experience in GNST-900S instrument debugging and training)

4. Trainees: 22 members of the research team related to environmental monitoring and experimental technicians from the research institute

（2） Preliminary preparation

Site and equipment preparation: The standardization laboratory of the research institute is selected as the training site, and the operation table is organized in advance to ensure good ventilation and that the temperature and humidity meet the requirements for instrument operation (temperature 5-40 ℃, relative humidity ≤ 85% RH). Place the GNST-900S host, multifunctional intelligent digestion instrument, supporting testing tubes, prefabricated reagents and other equipment and materials in place according to the operating line, complete the power connection and power on self-test, and ensure that all equipment is in normal working condition; Prepare calibration solution, simulated water sample, deionized water, lens cleaning paper and other practical consumables at the same time.
Site preparation: Clean up debris on the installation site, level the equipment installation base, reinforce with concrete pouring to ensure stable outdoor installation; Build windproof, rainproof, and anti-corrosion protective shelters at monitoring points, with reserved installation positions for solar panels on the top of the shelters to ensure good ventilation and facilitate equipment maintenance; Lay the line protection pipe according to the design path, and do a good job of anti rolling and anti soaking treatment.
Safety protection: Set up construction warning signs and protective fences to prevent breeding operators and livestock from touching equipment; Equip with protective equipment such as safety helmets, insulated gloves, waterproof shoes, etc; Check the insulation performance of construction tools, formulate emergency response plans for rainstorm, gale and other severe weather, and strengthen the safety protection of outdoor power use.

Refinement of the plan: The technical team communicated with the head of the operation and maintenance of the breeding base in advance, combined with the characteristics of high suspended solids content in the tail water of the breeding base, large fluctuations in water quality with feeding cycles, and complex outdoor environment, to refine the installation and commissioning plan in a targeted manner. The focus was on clarifying the operational standards for key links such as the outdoor fixing method of the GNST-SC1000 host, the selection of filtration accuracy for the pretreatment device (adapted to suspended solids filtration), the configuration parameters of the solar power supply module, and the parameters for data integration with the supervision platform of the Municipal Agriculture and Rural Bureau, to ensure that the plan meets the actual operational needs of the breeding base.

3、 Installation Implementation Process

The installation implementation strictly follows the HJ 353-2019 standard and equipment installation specifications, and follows the process of "core equipment installation → pipeline connection → system integration debugging". The specific steps are as follows:

（1） Installation of core equipment

1. Host installation: Fix the GNST-SC1000 host on a dedicated bracket inside an outdoor windproof and rainproof protective shed. The bracket is securely connected to a concrete base using expansion bolts to ensure that the body is level and well ventilated, with a straight-line distance of no more than 5m from the sampling port (reducing pipeline losses); The host interface faces inward and is sealed with specialized anti-corrosion sealing components to prevent rainwater, moisture, and corrosive gases in the aquaculture environment from affecting equipment operation.

2. Installation of sampling system: According to the requirements of HJ 353-2019 and the "Emission Standards for Tailwater Pollutants in Aquaculture" (DB43/1752-2020), the sampling probe should be installed in the mainstream area of the tailwater discharge outlet and the outlet of the ecological purification tank, ensuring that the probe is submerged and avoids dead corners of the water flow; The sampling pipeline adopts corrosion-resistant polytetrafluoroethylene hose, and the pipeline laying slope is not less than 1% to avoid the formation of water accumulation bends; Install a high flow pre filtration device (with a pore size of 8 μ m) to specifically solve the problem of suspended solids blockage in aquaculture wastewater. The filtration device is equipped with an automatic backwash function, set to backwash 3 times a day for 30 seconds each time, for easy daily maintenance and cleaning.

3. Installation of power supply system: Adopting a dual power supply mode of "solar energy+mains power backup", solar panels are installed on the top of the protective shed to ensure sufficient and unobstructed lighting. The solar modules are connected to energy storage batteries and equipped with charge and discharge controllers; Simultaneously connect to the mains power as a backup power source, install dedicated regulated power supply and leakage protection device to ensure stable power supply voltage and adapt to outdoor environments without stable mains power; The power line is laid with waterproof and anti-corrosion conduit, and grounding treatment is done to ensure electrical safety.
4. Installation of transmission module: Connect the GPRS transmission module to the GNST-SC1000 host data interface and fix it in the signal good area inside the protective shed; Insert the IoT SIM card, test the signal strength (ensure ≥ 3 grids), and complete the dual network adaptation with the smart fishery management platform of the breeding base and the supervision platform of Yiyang Agriculture and Rural Bureau through the device Modbus TCP protocol. Configure the data upload frequency (2h/time) and communication parameters to obtain key information such as MN number required for networking.

（2） Pipeline and line connection

1. Pipeline connection: Connect the sampling probe → pre filtering device → main engine sampling port in sequence. The pipeline interface is sealed with a sleeve type anti-corrosion seal. After connection, perform pressure testing (no leakage under 0.1MPa pressure); Install the backwash pipeline and waste liquid recovery pipeline, connect the backwash pipeline to the host and sampling probe, and ensure that the filtration device is regularly and automatically backwashed; The waste liquid recovery pipeline is connected to the tail water collection system of the breeding base to avoid secondary pollution.

2. Line connection: Connect the main unit to the sampling pump, preprocessing device, power supply system, and transmission module according to the equipment manual; All lines shall be laid with waterproof and anti-corrosion sleeves, and the sleeve interfaces shall be sealed properly. The direction of the lines shall avoid breeding operation areas and low-lying water accumulation areas; Mark both ends of the line for easy maintenance.

3. Grounding and lightning protection treatment: The equipment casing, protective shed, and power supply system all need to be grounded with a grounding resistance of ≤ 4 Ω to prevent outdoor electromagnetic interference and lightning damage to the equipment; Install lightning protection devices on the top of the protective shed, which are reliably connected to the grounding system to ensure that the equipment is within the lightning protection range.

4、 Debugging core process

The debugging work strictly follows the requirements of HJ 354-2019 standard and the "Emission Standards for Pollutants from Aquaculture Tail Water" (DB43/1752-2020), combined with the water quality characteristics of aquaculture tail water and outdoor monitoring needs, and carries out the debugging of core indicators in modules to ensure that the equipment performance meets the standards:

1. System initialization and debugging: Start the GNST-SC1000 device, complete the power on self-test, and check the operating status of the host, sampling system, preprocessing device, power supply, and transmission module; Configure basic parameters in the system settings interface, including detection indicators, detection cycle (set to 2 hours/time), data upload frequency, and alarm threshold (set according to the first level standard of the "Aquaculture Tail Water Pollutant Discharge Standard" (DB43/1752-2020)).

2. Precise calibration and debugging: In response to the high suspended solids content and large water quality fluctuations in aquaculture wastewater, a three-point calibration method is used to calibrate each core indicator separately. After cleaning the detection channel with deionized water three times, blank solution, low concentration standard calibration solution, and high concentration standard calibration solution are added in sequence. After the reading stabilizes, the calibration parameters are saved; After calibration is completed, verification is carried out using an intermediate concentration standard solution for testing, and the indication error must meet the requirement of ≤± 10%. Among them, the calibration of total phosphorus and total nitrogen requires the completion of parameter debugging of the digestion module in advance to ensure accurate control of the digestion temperature (total phosphorus 120 ℃, total nitrogen 125 ℃) and digestion time (both 30 minutes); The calibration of suspended solids indicators requires synchronous debugging of the optical detection module to ensure that the anti-interference ability meets the standard.

3. Performance testing and debugging: Conduct a 72 hour continuous operation test (in accordance with the requirements for outdoor online monitoring equipment debugging), monitoring at three concentration points of 20%, 50%, and 80% of the detection range, with a 24-hour drift of ≤± 5% F.S; Repeat the test 6 times for each concentration point, with a repeatability of ≤ 5%; Compare and test the actual tailwater samples from the breeding base, and ensure the accuracy of the data by comparing the equipment measurement values with the laboratory standard method measurement values with a relative error of ≤± 15%. Simultaneously test the stability of solar power supply to ensure that the equipment can operate normally under continuous rainy weather.
4. System linkage debugging: Test the linkage performance of the entire process of automatic sampling, preprocessing, detection, and data upload; Simulate scenarios where suspended solids and total phosphorus concentrations exceed the standard, verify the synchronous response of local alarm and platform alarm functions of the equipment, and require both the smart fishery management platform of the breeding base and the supervision platform of the Municipal Agriculture and Rural Bureau to receive alarm information within 5 minutes; Test the stability of GPRS transmission to ensure a data upload rate of ≥ 99%.

Technical briefing: The supplier's technical personnel conducted a special technical briefing on GNST-SC1000 equipment to the operation and maintenance personnel of the breeding base, focusing on explaining the daily maintenance points of the equipment for the tail water and outdoor environment of the breeding base (such as adjusting the backwash cycle of the pre filtration device, cleaning the outdoor protective shed, maintaining solar panels, and insulation measures for low-temperature weather equipment), data interpretation, and common troubleshooting methods to ensure that the operation and maintenance personnel have independent operation and maintenance capabilities.

5、 Acceptance and delivery

1. Acceptance content: The acceptance team is composed of the breeding base, suppliers, and third-party environmental testing institutions. They compare the installation and commissioning plan with relevant standards to verify the standardization of equipment installation, 72 hour continuous operation stability, core indicator detection performance (indication error, repeatability, drift), accuracy of data upload, and effectiveness of alarm function. They also verify the connection between the equipment and the supervision platform of the Municipal Agriculture and Rural Bureau to ensure compliance with the acceptance requirements of outdoor aquaculture tailwater monitoring facilities.

2. Data delivery: After passing the acceptance inspection, the supplier shall deliver a complete set of materials to the breeding base, including installation and commissioning reports, equipment manuals, calibration records, 72 hour operation test reports, quality assurance documents, and operation and maintenance manuals (including targeted maintenance points and common troubleshooting methods) suitable for outdoor breeding tailwater monitoring. The acceptance data shall be filed as required.

6、 Project effectiveness

Stable operation of equipment: After installation and debugging, the GNST-SC1000 monitoring equipment has achieved stable operation in complex outdoor environments (high temperature, heavy rain, strong winds) and fluctuating water quality of aquaculture wastewater in Yiyang. The continuous upload rate of core indicator monitoring data is ≥ 99.5%, and the equipment failure rate is less than 1%, which is suitable for outdoor aquaculture wastewater monitoring needs.

Environmental compliance guarantee: The equipment realizes 24-hour continuous monitoring of core indicators of aquaculture effluent, and the data is real-time connected to the intelligent fishery management platform of the aquaculture base and the supervision platform of Yiyang Agriculture and Rural Bureau, effectively avoiding the risk of environmental protection exceeding the standard; Through data anomaly warning, two incidents of fluctuation in tail water purification processes were detected and dealt with in advance, ensuring that the effluent quality remained stable and met the first level standards of the "Aquaculture Tail Water Pollutant Discharge Standards" (DB43/1752-2020), providing strong support for regional water ecological protection.

Operation and Maintenance Management Standards: Based on the characteristics of GNST-SC1000 equipment and the requirements for outdoor aquaculture effluent monitoring, a targeted instrument usage registration system, regular calibration (once a month), and maintenance system have been established. The daily inspection requirements for wind, rain, and lightning protection of outdoor equipment have been clarified, and operation and maintenance personnel have a clear understanding of equipment management responsibilities, effectively reducing the incidence of instrument failures and extending the service life of equipment.

Process optimization support: Based on continuous monitoring data from equipment, the operation and maintenance department of the breeding base analyzes the changes in tailwater quality under different breeding cycles and feeding amounts, providing data support for adjusting process parameters and optimizing feeding schemes for the ecological purification tank, achieving an improvement in tailwater treatment efficiency, and reducing tailwater treatment costs by about 7%.

6、 Experience Summary and Prospect

（1） Experience summary

Scene adaptation is key: This installation and debugging fully combines the characteristics of high suspended solids content, large water quality fluctuations, and complex outdoor environment in Yiyang aquaculture effluent. Targeted optimization of sampling pretreatment scheme, outdoor protection measures for equipment, and dual power supply mode are carried out, and suitable anti-corrosion, windproof, and lightning protection accessories are selected to ensure accurate adaptation of equipment to outdoor aquaculture effluent monitoring scenarios, laying the foundation for data accuracy.

Government enterprise collaboration is a guarantee: the efficient collaboration between breeding bases and instrument suppliers ensures that installation and commissioning plans are in line with the actual breeding conditions of the base, while strictly aligning with local regulatory requirements to ensure the smooth progress of equipment networking filing; The establishment of a follow-up technical support mechanism provides strong support for solving complex problems encountered by equipment during long-term outdoor operation, such as weather response and interference from high concentration tailwater detection.

（2） Future prospects

Based on the installation and debugging results, the subsequent breeding base will further enhance its ability to monitor the tail water of aquaculture. Firstly, the deployment range of GNST-SC1000 equipment will be expanded, and monitoring points will be added at the drainage outlets of each breeding pond to achieve full process water quality monitoring of the tail water of aquaculture; Secondly, relying on the advantages of equipment data transmission, we will deepen the linkage analysis between monitoring data and aquaculture technology, and improve the level of smart aquaculture control in accordance with the requirements of the Yiyang City Fishery Green Circular Development Pilot Program; Thirdly, we will continue to deepen cooperation with suppliers, timely follow up on equipment technology upgrades, optimize monitoring plans in accordance with new environmental regulations, and provide stronger support for the green and sustainable development of Yiyang Fisheries.