Sewage Treatment Plant Online Monitoring System Solution
The online monitoring system of the sewage treatment plant covers key process nodes such as the inlet pump station, biological treatment tanks, secondary sedimentation tanks, and outlet points. It deploys electromagnetic flow meters to measure the inflow and outflow in real time and is equipped with multi-parameter water quality online analyzers to monitor water quality indicators such as COD, ammonia nitrogen, total phosphorus, pH, dissolved oxygen, turbidity, and sludge concentration. Data is uploaded via industrial gateways to the plant-level SCADA system and environmental regulatory platforms, enabling automated monitoring of the entire sewage treatment process, process optimization, and ensuring compliance with discharge standards.
Overview
Summary
The online monitoring system of the sewage treatment plant covers key process nodes such as the inlet pump station, biological treatment tanks, secondary sedimentation tanks, and outlet points. It deploys electromagnetic flow meters to measure the inflow and outflow in real time and is equipped with multi-parameter water quality online analyzers to monitor water quality indicators such as COD, ammonia nitrogen, total phosphorus, pH, dissolved oxygen, turbidity, and sludge concentration. Data is uploaded via industrial gateways to the plant-level SCADA system and environmental regulatory platforms, enabling automated monitoring of the entire sewage treatment process, process optimization, and ensuring compliance with discharge standards.
Key Advantages
Challenges
- The fluctuation in influent and effluent water quality is significant, and the frequency of manual sampling and testing is low (typically once every 4 hours), making it difficult to promptly detect water quality abnormalities.
- Dissolved oxygen control in biochemical tanks relies on experience, with aeration energy consumption accounting for over 50% of the plant's electricity costs, yet precise regulation methods are lacking.
- Exceeding discharge standards carries the risk of high fines and production suspension, requiring real-time alerts rather than post-event accountability.
- The environmental protection department requires that discharge outlets install online monitoring equipment and connect the data to the network. Falsifying data will result in criminal liability.
Results
- A city wastewater treatment plant upgrade project: 12 sets of electromagnetic flowmeters and 18 sets of online water quality analyzers were deployed, reducing the effluent COD from 35 mg/L to a stable level below 25 mg/L, meeting the Class A standard.
- Intelligent Upgrading of a Wastewater Treatment Center in an Industrial Park: Achieving Precise Aeration Control Based on Real-Time Dissolved Oxygen and Ammonia Nitrogen Data, Resulting in Annual Electricity Savings of 420,000 kWh and Cost Reductions of Approximately 300,000 Yuan.
- Automation upgrade at a county-level wastewater treatment plant: Transitioning from manual chemical dosing to an automatic dosing system based on online water quality data, resulting in a 25% reduction in chemical costs and an increase in effluent compliance rate from 92% to 99.8%.
Solution Details
Sewage Treatment Plant Online Monitoring System Solution
The Sewage Treatment Plant Online Monitoring System Solution is centered on electromagnetic flow meters and multi-parameter water quality online analyzers. It provides real-time monitoring of flow and water quality parameters across the entire process from influent to effluent, delivering precise data for compliance discharge, process optimization, and energy conservation while meeting environmental data networking mandates.
Construction Background for Online Monitoring
Environmental regulations are increasingly stringent, with effluent standards for wastewater treatment plants being upgraded. This places higher demands on the accuracy and real-time capability of water quality monitoring for compliance.
Key pollutant-discharging units must install online monitoring equipment and connect to environmental protection networks, as mandated by pollutant discharge permit regulations. Simultaneously, under the "Dual Carbon" goals, plants face pressure to conserve energy, particularly in aeration systems which account for 50-70% of total electricity use.
Monitoring Points and Parameters
Influent Pumping Station Monitoring
Electromagnetic flow meters measure the influent flow, while pH meters and turbidity meters monitor incoming water quality. This allows for timely understanding of influent fluctuations, providing critical foresight for subsequent process adjustments.
Biological Treatment Tank Process Control
Dissolved oxygen electrodes monitor DO concentration in the aerobic zone, typically controlled at 2-4 mg/L. ORP electrodes and sludge concentration meters monitor conditions in anaerobic/anoxic zones and MLSS levels, guiding the precise adjustment of aeration volume and sludge recirculation ratio.
Secondary Sedimentation Tank Supervision
Submersible turbidity sensors monitor effluent turbidity and sludge blanket height. Ultrasonic level gauges track the tank water level, helping operators prevent incidents like sludge bulking and sludge washout.
Effluent Outlet Compliance Assurance
At the final discharge point, electromagnetic flow meters measure effluent flow. Online residual chlorine analyzers and multi-parameter water quality analyzers monitor disinfection effectiveness and key parameters like pH and dissolved oxygen to ensure compliant discharge, with data interfaced in real-time to the environmental protection platform.
Recommended Product Configuration
| Monitoring Location | Recommended Product | Purpose |
|---|---|---|
| Inlet/Outlet Pipeline | LGF Electromagnetic Flowmeter (Integrated/Separate Type) | Flow measurement, accuracy 0.5% |
| Biochemical Tank | Dissolved Oxygen Electrode + Sludge Concentration Meter | Aeration control and sludge management |
| Inlet/Outlet | pH/ORP Meter + Turbidity Meter | Basic water quality parameter monitoring |
| Effluent Disinfection | Online Residual Chlorine Analyzer | Disinfection effectiveness monitoring |
| Secondary Sedimentation Tank | Ultrasonic Level Gauge + Submersible Turbidity Meter | Liquid level and sludge interface monitoring |
| Integrated Monitoring | Small Water Quality Monitoring Station | Integrated multi-parameter monitoring |
Sewage Treatment Plant Online Monitoring System Advantages
✓ Full Process Coverage
Monitoring at every stage from inlet to outlet eliminates data blind spots, providing a complete picture of the wastewater treatment process.
✓ Energy Saving & Consumption Reduction
Precise aeration control based on online DO data can save 20-30% on electricity, reducing operational costs by hundreds of thousands annually.
✓ Compliance Assurance
Seamless data integration with environmental monitoring platforms meets the strict online monitoring requirements for pollutant discharge permits.
✓ Comprehensive Product Range
One-stop supply of flowmeters, water quality instruments, and level gauges reduces coordination costs and ensures system compatibility.
Key Features of the Online Monitoring Solution
Accurate Inflow and Outflow Flow Measurement
The LGF electromagnetic flow meter provides highly accurate flow measurement for both influent and effluent with an accuracy of 0.5%. Its performance is unaffected by suspended solids and grease commonly found in wastewater.
Multi-parameter Water Quality Online Monitoring
The system enables real-time online monitoring of critical parameters including pH, dissolved oxygen, turbidity, sludge concentration, and residual chlorine. Data is refreshed every 5-15 minutes for up-to-date process insights.
Biochemical Tank Process Optimization
Automatic adjustment of aeration volume is achieved based on online dissolved oxygen and ORP data. This precise aeration control is a core strategy for energy savings, typically achieving reductions of 20–30%.
Effluent Exceedance Warning System
The system automatically triggers an alarm when effluent water quality parameters exceed pre-set discharge standard thresholds. This provides operators with valuable response time for necessary process adjustments.
Environmental Data Networking Compliance
The solution ensures data connectivity to national and provincial pollution source online monitoring platforms using the standard HJ 212 protocol. This is essential for meeting pollutant discharge permit requirements.
Remote Operation and Fault Diagnosis
The central platform allows for remote monitoring of each instrument's online status and calibration cycles. It provides automatic alerts for sensor anomalies, facilitating proactive maintenance and timely replacement.
Approach
How we implement intelligence into your infrastructure step by step.
Process Analysis & Monitoring Design
Map the complete treatment process (pretreatment→biological→sedimentation→discharge) and determine key monitoring parameters at each stage
Instrument Selection & Installation
Select corrosion-resistant electromagnetic flowmeters, water quality analyzers, and level sensors; complete explosion-proof installation
Data Collection & SCADA Integration
Implement multi-parameter data collection via RTU terminals with seamless SCADA system integration for centralized monitoring
Compliance & Smart Alerts
Configure discharge standard threshold alerts and establish rapid response mechanisms for abnormal conditions
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