About Us

Certificates

Henan Suijing Environmental Protection Technology Co., Ltd

E-mail
1936867037@qq.com
Phone
17395967875
Address
5th Floor, Building 03, Liandong U Valley Science and Technology Innovation Valley, Qiming East Road, Yuhe District, Luoyang City, Henan Province, Suijing Environmental Protection

Monitoring Case of Liaoning Engine Enterprise Sewage Treatment Station

Date: 2025-12-23Read: 1

Application Case of Online Monitoring System for Liaoning Engine Enterprise Sewage Treatment Station

1、 Project Background and Requirements

A large engine manufacturing enterprise in Liaoning Province, with core business covering engine cylinder processing, component heat treatment, assembly testing, etc., generates a large amount of industrial wastewater during the production process, mainly including oily wastewater from mechanical processing, cooling wastewater from heat treatment, acid washing wastewater from surface treatment, and domestic sewage, which are uniformly collected into the self built sewage treatment plant in the factory for treatment. The wastewater from this enterprise has a complex composition, including petroleum COD、 If pollutants such as ammonia nitrogen, total phosphorus, suspended solids, and small amounts of heavy metals (such as Zn and Ni) are not treated and discharged in compliance with standards, they will not only pollute the surrounding water environment but also violate environmental regulations.

Due to the insufficient ability of existing laboratory operators to understand the core principles, parameter settings, precise operation, and troubleshooting of new equipment, if directly put into use, problems such as non-standard operation, large data deviations, and rapid equipment wear and tear may occur, which cannot meet the requirements of efficient testing business. Based on this, the enterprise entrusts equipment suppliers to arrange technical engineers to provide on-site customized training services, ensuring that laboratory personnel fully master equipment usage skills and guarantee the rapid deployment of new equipment in practical applications.

2、 Basic Training Information

Training target: 10 core testing personnel in the laboratory, including 3 equipment administrators (all with basic water quality testing experience, without GNST-SC1000 operation foundation)

（1） Overall system architecture

The system adopts a three-level architecture of "on-site monitoring layer data transmission layer central control management layer" to achieve closed-loop management of the entire process of sewage treatment water quality indicators from real-time collection to intelligent regulation: ① On site monitoring layer: deploys multi parameter online monitoring equipment (including COD, ammonia nitrogen, total phosphorus, petroleum, suspended solids, pH detectors), equipped with automatic sampling devices, preprocessing modules, and dedicated sensors, responsible for real-time detection of water quality indicators in each link; ② Data transmission layer: Through industrial Ethernet+4G dual-mode transmission, it ensures stable data upload in complex industrial environments in the factory area, supports breakpoint continuation, and meets the requirements of environmental data transmission standards; ③ Central control management: Build an intelligent monitoring platform to achieve real-time data display, trend analysis, abnormal alarm, report generation, and linkage control of sewage treatment processes.

（2） Key point deployment

Based on the process flow of the sewage treatment plant, monitoring equipment is accurately deployed at the core nodes to achieve full process coverage: ① Pre treatment unit: regulating tank inlet (monitoring COD, petroleum, suspended solids, and determining the inlet water quality load), oil separation tank outlet (monitoring petroleum, evaluating oil removal effect); ② Biochemical treatment unit: inlet and outlet of aeration tank (monitoring COD, ammonia nitrogen, dissolved oxygen, regulating aeration intensity), outlet of secondary sedimentation tank (monitoring suspended solids, total phosphorus, evaluating sedimentation effect); ③ Deep processing unit: filtration system outlet (monitoring suspended solids, pH, ensuring effluent accuracy); ④ Discharge outlet: Total discharge outlet (monitoring COD, ammonia nitrogen, total phosphorus, petroleum, suspended solids, etc.) pH， Ensure compliance with emission standards and upload data synchronously to the Liaoning Province Ecological Environment Monitoring Platform. Each monitoring device at each point is equipped with anti-corrosion and anti vibration protective enclosures, suitable for the humid and corrosive gas environment of sewage treatment plants.

（3） Core equipment parameters

The core parameters of the selected online monitoring equipment are accurately adapted to the sewage treatment monitoring needs of engine enterprises: ① Monitoring parameters and ranges: COD (0-1000mg/L), ammonia nitrogen (0-50mg/L), total phosphorus (0-10mg/L), petroleum (0-50mg/L), suspended solids (0-100NTU), pH (0-14); ② Measurement accuracy: COD ± 5% FS, ammonia nitrogen ± 5% FS, total phosphorus ± 5% FS, in compliance with industrial wastewater detection standards; ③ Measurement cycle: The minimum measurement cycle is 30 minutes, and it can be adjusted from 1 to 9999 minutes. It can be flexibly set according to process requirements; ④ Calibration cycle: adjustable at any interval from 1 to 99 days, reducing maintenance costs; ⑤ Operating environment: temperature+5~40 ℃, humidity ≤ 90% (non condensing), suitable for indoor and outdoor installation conditions of sewage treatment plants; ⑥ Output function: Supports RS-232, RS485, 4-20mA signal output, can be directly connected to the central control platform and environmental monitoring platform; ⑦ Protection function: It has abnormal alarm and power-off data retention function, automatically restores working status after power outage and incoming call, ensuring monitoring continuity.

（4） Preprocessing module adaptation

In response to the characteristics of high oil content and suspended solids in engine enterprise wastewater, the monitoring equipment is equipped with a customized pretreatment module: a two-stage filtration device (coarse filtration+fine filtration) is used, which first removes large suspended particles through a 5 μ m coarse filtration, and then removes small impurities through a 0.45 μ m fine filtration to avoid blocking the detection channel; Add an oil-water separation unit to separate floating oil in the water sample in advance, eliminating the interference of petroleum on the detection accuracy of other indicators; Equipped with high-pressure automatic backwashing function, regularly clean the filtering components to ensure stable pre-treatment effect and adapt to high load sewage monitoring needs.

（5） Training adaptation adjustment (supplement)

Considering the insufficient ability of sewage treatment plant operators to understand the core principles, parameter settings, and troubleshooting of online monitoring equipment, the enterprise has commissioned equipment suppliers to conduct customized on-site training: ① Training target: 10 core operation and maintenance personnel of the sewage treatment plant, including 3 equipment administrators (all with basic sewage treatment experience but no foundation in online monitoring equipment operation); ② Training equipment: practical prototype of online monitoring equipment and consumables for detecting core parameters such as COD and ammonia nitrogen; ③ Training focus: targeted content such as equipment calibration, sewage pretreatment operation, abnormal data judgment, equipment anti-corrosion maintenance, etc., to ensure that personnel fully master equipment usage skills.

3、 Implementation of core processes and functions for online monitoring

（1） Automated implementation of full process monitoring

The system implements a fully automated monitoring process without the need for manual supervision: ① Automatic sampling: monitoring equipment at each point automatically collects water samples according to preset cycles, with a precise sampling volume controlled at 50mL to ensure detection representativeness; ② Preprocessing: After two-stage filtration and oil-water separation, the water sample enters the detection unit to remove interference factors; ③ Detection and analysis: Based on different parameter characteristics, multi parameter synchronous detection is completed through corresponding detection technologies such as spectrophotometry and electrode method. The digestion unit precisely controls the temperature and duration for COD and total phosphorus detection; ④ Result output: The detection data is displayed in real-time on the local touch screen of the device and uploaded to the central control platform and Liaoning Province ecological environment monitoring platform through a dual-mode transmission channel, with a data transmission delay of ≤ 3 seconds.

（2） Data transmission and platform management functions

1. Data transmission: Adopting a dual-mode transmission mode with industrial Ethernet as the main and 4G as the backup, supporting data encryption transmission to prevent information leakage and ensure stable data upload in complex network environments of sewage treatment stations, in compliance with HJ/T 212 environmental protection data transmission standards. 2. Core functions of the platform: ① Real time display: The central control platform dynamically displays multi parameter water quality data and equipment operation status (such as calibration status and cleaning status) of each monitoring point, using line charts and bar charts to present data change trends and intuitively reflect the sewage treatment effect; ② Abnormal alarm: preset warning values for various parameters (such as COD ≥ 80mg/L, ammonia nitrogen ≥ 12mg/L) and exceedance values (in accordance with the first level A standard limit). When the data reaches the warning threshold, the platform immediately triggers an audible and visual alarm, and pushes a text message warning to the management personnel's mobile phones, marking the abnormal points and exceedance values. The response time is ≤ 5 minutes; ③ Data traceability: Automatically store historical detection data (storage period ≥ 1 year), support accurate queries by time, location, and parameters, generate detection reports that meet regulatory requirements and export them; ④ Equipment management: The platform can remotely set equipment calibration and sampling cycles, monitor equipment failure status in real-time, and generate maintenance reminders.

（3） Linkage control and process optimization

Intelligent linkage between the system and sewage treatment process system to improve treatment efficiency and compliance rate: ① Inlet load regulation: Based on real-time data of COD and petroleum at the inlet of the regulating tank, the inlet flow rate is automatically adjusted to avoid high load impact on the biochemical system; ② Biochemical process regulation: Based on COD, ammonia nitrogen, and dissolved oxygen data in the aeration tank, automatically adjust the speed and aeration amount of the aeration fan to optimize the microbial reaction environment; ③ Accurate dosing control: Based on the total phosphorus data at the outlet of the secondary sedimentation tank, the dosage of flocculants and phosphorus removal agents is automatically calculated, and the dosing rate is adjusted by the linked dosing pump to avoid chemical waste; ④ Emergency response: When there is a warning of parameter exceeding the standard at the main discharge outlet, the discharge valve will be automatically closed, and the sewage will be returned to the regulating pool for reprocessing. At the same time, emergency response reminders will be pushed to ensure stable and compliant effluent.

4、 System operation guarantee and maintenance

（1） Daily maintenance standards

Based on the humid, corrosive, and highly suspended environmental characteristics of the sewage treatment plant, a targeted maintenance plan is formulated: ① Daily: inspect the operation status of the equipment through the central control platform, check the remaining amount of reagents and the pressure of the pretreatment module (to determine whether the filtration is blocked), and clean the surface water stains and corrosive substances of the equipment; ② Weekly: Disassemble and clean the pre-treatment filtration module and sampling port to avoid oil stains and suspended solids clogging; Complete equipment calibration according to platform reminders to ensure detection accuracy; ③ Monthly: Conduct a comprehensive inspection of equipment sealing performance, data transmission stability, and replace expired reagents; Check the heating performance and electrode status of the digestion unit; ④ Quarterly: Conduct third-party comparison and verification of test data to ensure accurate and reliable test results; Synchronize and check the effectiveness of the linkage control function to ensure the accuracy of process regulation.

（2） Emergency handling of faults

Establish a rapid response mechanism for common faults in online monitoring: ① Sampling blockage: The equipment automatically triggers a backwash program. If the cleaning is ineffective, the platform pushes a fault warning, and maintenance personnel arrive within 1 hour to disassemble and clean it; ② Calibration failed: The platform prompts that the calibration solution is invalid or the sensor is abnormal. Replace the calibration solution and recalibrate. If it is invalid, replace the sensor; ③ Data transmission interruption: automatically switch to 4G backup transmission, while troubleshooting Ethernet faults to ensure uninterrupted upload of environmental data; ④ Detection accuracy deviation: Review the preprocessing process and digestion parameters, recalibrate the equipment, and contact supplier technical support if necessary; ⑤ Equipment corrosion: Regularly inspect the protective casing and seals of the equipment, replace them promptly if corrosion is found, and avoid damage to the core components of the equipment.

5、 Application effectiveness

1. The precision of standard control has been significantly improved: real-time monitoring of the entire sewage treatment process has been achieved, and the data lag time has been reduced from the traditional 4 hours to 3 seconds. The response time for water quality abnormal warning is ≤ 5 minutes, effectively avoiding the risk of excessive discharge. Since the operation of the system, all indicators of the effluent from the sewage treatment plant have steadily reached the first level A standard, COD、 The average emission concentrations of ammonia nitrogen and total phosphorus were controlled within 35mg/L, 5mg/L, and 0.3mg/L, respectively, which were better than the preset control standards and successfully passed multiple rounds of inspections in Liaoning Province.

2. Significant cost reduction and efficiency improvement achievements: Through the intelligent linkage dosing system, the consumption of coagulants and phosphorus removal agents has been reduced by 35% compared to traditional manual dosing, saving approximately 180000 yuan in chemical costs annually; Accurately regulating aeration and inlet load, reducing energy consumption of equipment such as fans and pumps, and saving approximately 120000 yuan in electricity bills annually; Reduce the workload of manual sampling and testing, streamline 2 testing positions, and save approximately 160000 yuan in labor costs annually; After process optimization, the sewage reuse rate has been increased to 30%, saving about 12000 tons of water annually, which meets the industrial water-saving requirements of Liaoning Province.

3. Compliance and management upgrade: Establish a complete sewage treatment monitoring data traceability system, automatically generate testing reports that meet environmental supervision requirements, and achieve "full traceability" of data throughout the process; The central control platform realizes the visualization management of the entire sewage treatment process, providing reliable data support for process optimization, improving the level of operation and maintenance refinement, ensuring the continuous and stable operation of the sewage treatment station, maintaining the enterprise's environmental credit rating, and establishing the green development of Liaoning equipment manufacturing enterprises.

2. Significant cost reduction and efficiency improvement achievements: Through the intelligent linkage dosing system, the consumption of corrosion inhibitors is reduced by 30% compared to traditional manual dosing, saving approximately 150000 yuan in annual drug costs; Accurate pollution discharge and water replenishment regulation, reducing fresh water consumption by about 10%, saving about 5000 tons of water annually, in line with the industrial water-saving requirements of Hebei Province; Reduce the workload of manual sampling and testing, streamline one testing position, and save approximately 80000 yuan in labor costs annually; The reduction of equipment failures shortens production downtime and indirectly improves production efficiency.

3. Compliance and management upgrade: Establish a complete traceability system for monitoring data of total iron in circulating water, automatically generate testing reports that meet regulatory requirements, and successfully pass the verification of the ecological environment and industrial management department of Hebei Province; The central control platform realizes the visualization management of the entire process of total railway monitoring, providing reliable data support for corrosion prevention and process optimization of the circulating water system, improving the level of precision operation and maintenance, ensuring the continuous and stable operation of production equipment, and providing strong guarantee for the stable quality of tobacco products.