Reservoir and Water Source Water Quality Safety Online Monitoring Solution: Building an Intelligent Barrier for Urban Water Supply Safety

Industry Pain Points and the Necessity of Online Monitoring

Reservoirs and water sources, as the lifeline of urban drinking water, their water quality safety is directly related to the health of thousands of households and social stability. However, traditional management models are facing unprecedented challenges.

Industry Problems

• Large space, low efficiency of manual inspection: Water sources are usually vast with complex terrain. Relying on manual sampling is time-consuming and labor-intensive, with low sampling frequency, making it easy to miss sudden pollution.

• Poor timeliness, unable to provide early warning: Laboratory analysis often takes hours or even days. When water quality abnormalities are detected, pollution may have already spread, missing the best time for treatment.

• Increased risk of new pollution: Agricultural non-point source pollution, sudden chemical leaks, and algal blooms (cyanobacteria outbreaks) caused by climate warming occur frequently, posing higher requirements for traditional monitoring methods.

Why Online Monitoring is Needed?

Modern water source management urgently needs to shift from "passive response after the event" to "active early warning beforehand". Online monitoring can provide continuous, real-time water quality dynamic data, helping management departments respond when pollution first appears, using data to gain valuable buffer time for water supply safety.

What Can the Reservoir and Water Source Water Quality Safety Online Monitoring System Solve?

The reservoir and water source safety monitoring system built by YEXsensor deploys high-precision multi-parameter water quality probes and wireless intelligent buoys to construct an all-weather digital protection network. The system can automatically capture subtle changes in water quality, accurately predict algal bloom risks, and issue second-level alarms in the event of malicious pollution, completely solving the pain points of many blind spots and slow response, using technology to protect the source of living water.

Reservoir and Water Source Water Quality Safety Online Monitoring Solution Application Scenarios

This solution is designed for complex field and water environments and is widely applicable to the following core scenarios:

• Urban centralized drinking water source protection areas: Continuous monitoring of water quality entering the water intake to ensure raw water safety.

• Large reservoirs and lakes: Multi-level, full-basin water quality dynamic tracking for deep water areas and lake center areas.

• Inflow rivers and water transmission channels: Set up defenses at key control sections to intercept and monitor non-point source pollution from upstream incoming water.

• Ecological wetlands and landscape water bodies: Evaluate water ecological restoration effects and monitor eutrophication trends.

Reservoir and Water Source Water Quality Safety Online Monitoring Solution System Components

The system adopts a modular, low-power design, perfectly adapted to harsh environments without electricity or network cables in the field. It mainly consists of the following five core parts:

1. Acquisition Terminal (Intelligent Buoy/Monitoring Station)
As a floating base on water, it uses UV-resistant and corrosion-resistant polyethylene materials, integrated with solar power supply system and maintenance-free battery, ensuring stable operation even in continuous rainy weather.

2. Water Quality Sensors (Data Source)
Submersible online sensors are directly immersed in the water body, equipped with automatic cleaning brushes to prevent biofouling and sediment pollution, ensuring long-term online measurement accuracy.

3. Data Collector (Edge Computing)
Built-in high-performance low-power microprocessor, responsible for high-speed data collection from various sensors, filtering algorithm processing, local data caching, and controlling sensor cleaning brush operation cycles.

4. Wireless Transmission Network
Supports 4G full network or LoRa local wireless transmission. In areas with base station coverage, data is directly uploaded to the cloud via 4G; in remote reservoir areas with weak signals, data can be aggregated to shore-based gateways through LoRa networking and then transmitted uniformly.

5. Cloud Early Warning Platform
Data is ultimately aggregated to the YEXsensor cloud platform, providing visualization dashboards, historical trend analysis, algal bloom risk modeling, WeChat/SMS alarms and other functions to achieve business closed loop.

Monitoring Parameters and Working Principle

System Working Principle

The system operates based on a closed-loop process of “perception-transmission-analysis-alarm”:

Sensors periodically receive wake-up instructions from the data collector. The built-in automatic cleaning brush first runs tangentially to remove attachments from the sensor optical window or electrode surface. Then, the sensor performs physical measurement and converts analog signals into digital signals (RS485/Modbus-RTU protocol). After reading the data, the collector sends encrypted data packets to the cloud server via 4G/LoRa network. The cloud platform uses preset threshold algorithms and trend models to analyze the data in real time.

System Functional Features

• Zero reagent secondary pollution: All lines use physical and electrochemical sensors, without consuming any chemical reagents or producing waste liquid, absolutely protecting the water source ecology.

• High adaptability self-cleaning: Aiming at the characteristics of easy growth of moss and algae in water sources, sensors are equipped with intelligent self-cleaning brushes, extending maintenance cycles to several months.

• Stereoscopic multi-dimensional early warning: Combining abnormal pH rise, excessive dissolved oxygen saturation, and sharp increase in chlorophyll a, the system can issue medium-risk algal bloom warnings 3-5 days in advance.

• Low-power green operation: Innovative power management strategy allows sensors to automatically enter deep sleep when not measuring. Overall power consumption is extremely low, and a perfect closed loop can be achieved with solar power alone.

System Architecture

The system's topology shows the complete chain from underwater physical perception to cloud intelligent decision-making:

[Underwater Perception Layer] → [Network Transmission Layer] → [Application Management Layer]

YEX-S1-RDO Fluorescence DO Sensor, YEX-S1-PH Industrial Online pH Sensor, YEX-S1-ZS Infrared Turbidity Sensor, YEX-S1-NHN Ammonia Nitrogen Sensor, YEX-S1-CHL Chlorophyll/COD Sensor (Optional) → Intelligent Data Collector (with solar management) → YEXsensor Cloud Computing Platform (4G/LoRa) → Dashboard, APP, SMS Alarm

Customer Value and Benefits

• Political and social benefits: Change from "passive rescue" to "active prevention", cutting off the possibility of drinking water source pollution events evolving into social public safety incidents.

• Cost reduction and efficiency improvement: Compared with traditional fixed shore stations costing hundreds of thousands, the buoy system eliminates land approval, civil construction and pipeline laying, reducing deployment costs by more than 60%.

• Scientific research and data assets: Long-term accumulated continuous water quality data can provide scientific decision-making basis for water source ecological restoration and watershed pollution total control.

Recommended Product Combinations

1. Core Monitoring Kit: Includes four-in-one sensor group of YEX-S1-RDO (DO), YEX-S1-PH (pH), YEX-S1-ZS (turbidity), YEX-S1-NHN (ammonia nitrogen).

2. Multi-function Data Acquisition Terminal: Industrial-grade RS485 collector, supports Modbus protocol, IP67 protection rating.

3. High-strength Small Water Quality Buoy: 0.8m or 1.2m diameter PE buoy body, including 60W-100W solar panel and high-reliability mooring components.

Project Cases

Case 1: Early Warning Project for Algal Bloom in a Large Urban Drinking Water Reservoir in Southern China

Project background: The reservoir is prone to seasonal cyanobacteria outbreaks during summer high temperatures, affecting water supply taste and safety.

Deployment solution: Deployed 5 sets of YEXsensor intelligent buoy systems integrated with YEX-S1-RDO, YEX-S1-PH and chlorophyll a sensors, using 4G transmission.

Operation effect: Over two years of continuous operation, the system successfully issued medium-risk algal bloom warnings 4 days in advance through combined abnormal increases in pH and chlorophyll indicators under multiple high-temperature low-wind conditions, assisting management departments to take timely measures such as starting emergency pumps to agitate water flow, successfully suppressing large-scale algae outbreaks.

Case 2: Control Section Monitoring of a Northern Cross-basin Water Diversion Project

Project background: Long water transmission channels with risks of agricultural non-point source pollution inflow along the route.

Deployment solution: Deployed 5 groups of LoRa networked water quality monitoring points at key inflow sections, focusing on monitoring YEX-S1-NHN (ammonia nitrogen) and turbidity.

Operation effect: Effectively overcame the problem of no mobile network signal in some canyon areas along the route, using LoRa series return to control inflow water quality in real time.

FAQ

Q1: How often do sensors need manual cleaning in outdoor reservoirs?
Answer: Our YEX-S1 series sensors (such as turbidity, dissolved oxygen, etc.) can be equipped with or come with automatic mechanical cleaning brushes. In conventional reservoir water bodies, the brushes automatically clean the window before each measurement. Usually, the cycle for manual inspection and deep maintenance can be as long as 3 to 6 months.

Q2: Does the ammonia nitrogen sensor (YEX-S1-NHN) using ion selective electrode method suffer from large interference from other ions in the water?
Answer: The ion selective electrode method is indeed susceptible to interference from ions of the same charge such as potassium ions (K⁺). For this reason, our sensor integrates interference compensation algorithms internally, maintaining extremely high measurement accuracy under standard drinking water source water quality backgrounds. In high salinity or complex industrial wastewater inflow areas, it is recommended to contact our engineers for customized calibration.

Q3: Why is temperature not listed as a separate sensor model in this solution?
Answer: Because water quality parameters (especially pH and dissolved oxygen) are extremely significantly affected by temperature changes. To ensure absolute measurement accuracy, our YEX-S1-PH and YEX-S1-RDO sensors have high-precision temperature sensors integrated internally for real-time temperature compensation. Therefore, the system does not need to purchase additional separate temperature probes and can directly output accurate temperature data.

Q4: In continuous rainy days, how long can the solar power supply system support buoy operation?
Answer: In the system design, we adopted strict low-power consumption budgeting. In full battery state, even without direct sunlight, the system can still support continuous stable operation for more than 15 days at a collection frequency of once every 15 minutes relying on the built-in high-capacity maintenance-free battery.

Q5: What to do if the reservoir surface freezes in winter?
Answer: In northern cold regions, if the reservoir experiences large-scale deep freezing in winter, we strongly recommend retrieving the buoys and sensors to shore for temporary storage before freezing. Because the extrusion and frost heave force of the ice layer may damage the sensor housing or destroy the buoy's mooring system. Redeploy after the ice and snow melt in spring.

Open Your Intelligent Water Source Management

Protecting drinking water source safety is a responsibility heavier than Mount Tai. YEXsensor is committed to providing you with a full-stack digital water quality monitoring solution from precise sensing to cloud decision-making. Whether you need to upgrade existing reservoir supervision systems or build new automated water source protection zones, our professional team can customize the most reasonable configuration solution for you.

Contact our technical experts now to obtain detailed technical white papers and customized quotations.

Phone / WhatsApp / WeChat: +8615111147890

Email: sales@yexsensor.com