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Case Study of Outdoor Monitoring Station for Rural Domestic Sewage in Jiaxing City, Zhejiang Province

Date: 2025-12-24Read: 1

Installation and commissioning case of GNST-SC1000 online COD ammonia nitrogen total phosphorus total nitrogen detector for rural domestic sewage outdoor monitoring station in Jiaxing City, Zhejiang Province

1、 Project Background and Overview

（1） Project Background

Jiaxing City, Zhejiang Province, as a leading area for integrated urban-rural sewage treatment, has achieved full coverage of rural domestic sewage treatment facilities in administrative villages and standardized operation and maintenance. Rural domestic sewage contains core pollutants such as COD, ammonia nitrogen, total phosphorus, and total nitrogen, and its discharge compliance directly affects the regional water ecological environment. To strengthen operation and maintenance supervision, accurately grasp water quality dynamics, and support the operation of the "GIS+BIM" smart water management system, Jiaxing Water Group has set up outdoor monitoring stations and equipped GNST-SC1000 online COD, ammonia nitrogen, total phosphorus, and total nitrogen detectors at the discharge outlets of centralized sewage treatment facilities in rural areas such as Haiyan County and Jiashan County. This device has a high protection level of IP68 and low power consumption characteristics. It is equipped with an integrated GSM/GPRS modem and supports multi band communication at 850/900/1800/1900 MHz. It is suitable for complex outdoor environments such as high temperature, rainy weather, and no electricity supply in rural areas. It can achieve 24-hour continuous monitoring and remote data transmission of four core indicators. 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 Jiaxing Water Group, to ensure the stable operation of the equipment and accurate and effective data.

（2） Core objective

Theoretical level: Enable trainees to understand the detection principle, core technical indicators, and national standard basis of each testing item of SC-1000 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 detector host, sampling system, preprocessing device, solar power supply, and GPRS transmission module, ensuring that the installation complies with the requirements of the "Technical Specification for Installation of Online Monitoring System for Water Pollution Sources (COD? Cr?, NH? - N, etc.)" (HJ 353-2019).
Accurate debugging: Achieve precise calibration and performance testing of COD, ammonia nitrogen, total phosphorus, and total nitrogen indicators, ensuring 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 smart water platform, relying on its Modbus TCP communication protocol to achieve real-time uploading of monitoring data and normal response of abnormal warning functions.
Long term guarantee: Formulate standardized installation and commissioning manuals and maintenance points that are compatible with the GNST-SC1000 model, providing technical support for the stable operation of subsequent equipment.

2、 Training preparation

（2） Preliminary preparation

Site organization: Clean up the debris on the installation site, level the equipment installation base, and ensure that the base is at least 10cm above the ground (to prevent rainwater immersion); Excavate cable trenches according to the design path and carry out waterproof and anti-seepage treatment.
Safety protection: Set up construction warning signs, equip with safety helmets, insulated gloves, waterproof shoes and other protective equipment; Check the insulation performance of construction tools and develop an emergency shutdown plan for rainy days.

Refinement of the plan: The technical team communicated with the operation and maintenance manager of Jiaxing Water Group in advance, combined with the water quality characteristics of rural domestic sewage in Jiaxing (COD and ammonia nitrogen as core control indicators), the operating environment of outdoor monitoring stations (high temperature, rainy weather, remote areas without mains electricity), and the needs of smart operation and maintenance, to refine the installation and commissioning plan in a targeted manner, focusing on clarifying the operating standards of key links such as GNST-SC1000 host waterproof sealing, GPRS signal adaptation, and solar power supply system matching, to ensure that the plan is in line with the actual situation of rural sewage monitoring.

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 the protective shed, ensuring that the body is level, well ventilated, and the straight-line distance from the sampling port does not exceed 5m (reducing pipeline losses); The host interface faces inward and is sealed with specialized sealing components to prevent direct rainwater erosion.

2. Installation of sampling system: According to HJ 353-2019 requirements, install the sampling probe in the main flow area of the discharge outlet, ensuring that the probe is submerged and avoids dead corners of water flow; The sampling pipeline adopts corrosion-resistant and waterproof hoses, and the pipeline laying slope is not less than 1% to avoid the formation of water accumulation bends; Install a pre filtration device (with a pore size of 5 μ m) to prevent suspended solids from blocking the pipeline. The filtration device should be easy to disassemble and clean.

3. Installation of power supply system: The solar panels are installed in an open area without obstruction, facing due south, with a tilt angle of 45 ° (suitable for Jiaxing latitude); The energy storage battery is fixed in a dedicated waterproof box inside the protective shed, correctly connected to the solar controller and inverter, and properly labeled with positive and negative poles and insulated; Test the stability of the output voltage of the power supply system to ensure that it meets the operational requirements of the equipment (DC 12V).
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 signal strength (ensure ≥ 3 grids), complete network adaptation with the smart water platform through the Modbus TCP protocol of the device, configure data upload frequency and communication parameters.

（2） Pipeline and line connection

1. Pipeline connection: Connect the sampling probe → pre filtering device → main machine injection port in sequence, and the pipeline interface is sealed with a sleeve. After connection, perform pressure testing (no leakage under 0.1MPa pressure); Install the backwash pipeline, connect the backwash interface of the host to the discharge port, and ensure that the backwash function is normal.

2. Instrument initialization: Demonstrate the GNST-SC1000 power on self-test process and explain how to determine the operating status of the instrument hardware (display screen, buttons, light source) and software system; Introduce the parameter adjustment methods for the system settings interface, such as the detection cycle, alarm threshold, data upload protocol, and other key parameter configurations.

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 conduit, and the conduit interface shall be sealed properly; Mark both ends of the line for easy maintenance.

3. Grounding treatment: The equipment casing, protective shed, and power supply system all need to be grounded with a grounding resistance of ≤ 4 Ω to prevent lightning damage to the equipment; Install lightning protection devices around the outdoor monitoring station 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 carries out the debugging of COD, ammonia nitrogen, total phosphorus, and total nitrogen 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 1 hour/time), data upload frequency, and alarm threshold (set according to the discharge standards for rural domestic sewage treatment facilities).

2. Precise calibration and debugging: The two-point calibration method is used to calibrate the four indicators separately. After cleaning the detection channel with deionized water three times, blank solution and 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).

3. Performance testing and debugging: Conduct 24-hour drift and repeatability testing, continuously monitor for 24 hours at two concentration points of 20% and 80% of the detection range, with 24-hour drift ≤ ± 5% F.S; Repeat the test 6 times for each concentration point, with a repeatability of ≤ 5%; Comparing and testing actual rural domestic sewage samples, the relative error between the equipment measurement values and the laboratory standard method measurement values is ≤± 15% to ensure data accuracy.
4. System linkage debugging: Test the linkage performance of the entire process of automatic sampling, preprocessing, detection, and data upload; Simulate abnormal data scenarios (such as COD concentration exceeding the standard), verify the equipment alarm function and platform response speed (requiring the platform to receive alarm information within 5 minutes); Test the stability of 4G 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 water group's operation and maintenance personnel, focusing on explaining the daily maintenance of the equipment (such as cleaning the filtration device, replacing reagents, calibration cycles), data interpretation, and common troubleshooting methods to ensure that the operation and maintenance personnel have basic operation and maintenance capabilities.

5、 Acceptance and delivery

1. Acceptance content: The acceptance team is jointly composed of Jiaxing Water Group, suppliers, and third-party supervisors. They compare the installation and commissioning plan with relevant standards to inspect the equipment installation standardization, system operation stability, four indicators testing performance (indication error, repeatability, 24-hour drift), data upload accuracy, and alarm function effectiveness.

2. Data delivery: After passing the acceptance inspection, the supplier shall deliver a complete set of materials to the Water Group, including installation and commissioning reports, equipment manuals, calibration records, performance testing reports, quality assurance documents, and operation and maintenance manuals (including daily maintenance points and common troubleshooting methods).

6、 Project effectiveness

Stable operation of equipment: After installation and debugging, the GNST-SC1000 detector has achieved stable operation in complex outdoor environments in rural areas. The continuous upload rate of monitoring data for four core indicators is ≥ 99%, and the equipment failure rate is less than 1%. It is suitable for operating scenarios in rural areas without mains power and with severe weather conditions.

Improved operation and maintenance efficiency: After training, all outdoor monitoring stations operate stably, achieving 24-hour continuous monitoring of core indicators of rural domestic sewage. The monitoring data is real-time connected to the smart water platform, and the operation and maintenance efficiency is improved by more than 50%; Through data anomaly warning, 3 abnormal operation problems of sewage treatment facilities were detected and dealt with in advance, ensuring stable and up to standard effluent quality.

Management standards: Based on the characteristics of GNST-SC1000 equipment, a targeted instrument usage registration system, regular calibration and maintenance system have been established. The operation and maintenance personnel have clarified the equipment management responsibilities, effectively reducing the incidence of instrument failures and extending the service life of the equipment.

Improved management mechanism: Through this training, the operation and maintenance management system of rural sewage outdoor monitoring stations in Jiaxing City has been improved, and a skill enhancement mechanism of "training+assessment+daily communication" has been established, providing solid technical support for the integrated treatment of urban and rural sewage in the whole region.

5、 Experience Summary and Prospect

（1） Experience summary

Equipment adaptation is the foundation: This installation and debugging fully combines the GPRS multi band communication and high protection level characteristics of GNST-SC1000 equipment, optimizes the installation plan targetedly, ensures precise adaptation of the equipment to rural outdoor environments and smart water platforms, and lays the foundation for stable system operation.

Government enterprise collaboration is a guarantee: the efficient collaboration between the water group and instrument suppliers ensures that the training content is in line with the actual operation and maintenance, and the establishment of subsequent technical support mechanisms provides strong support for solving complex problems in the long-term operation of outdoor monitoring stations.

（2） Future prospects

Based on the results of this installation and commissioning, Jiaxing City will further promote the improvement of rural domestic sewage monitoring capabilities: firstly, expand the deployment range of GNST-SC1000 equipment to achieve full coverage of key villages; Secondly, relying on the advantages of device data transmission, deepen the linkage analysis between monitoring data and facility operation and maintenance; The third is to continuously optimize the functions of the smart water management platform, promote the deep integration of monitoring data with the integrated urban and rural sewage treatment system, and provide stronger support for the continuous improvement of the rural ecological environment in Jiaxing City.