Water & Wastewater

Continuous monitoring and control instruments for water and process applications

Industry Overview

Industrial wastewater contains complex pollutants from chemical, textile, food processing, pharmaceutical, and heavy industry operations. To stay compliant and reduce treatment costs, factories need accurate, real-time monitoring of key water quality parameters such as pH, ORP, COD, Turbidity, Conductivity, DO, and more.

Common Water Quality Challenges in Industrial Wastewater Plants

pH fluctuations affecting chemical dosing and compliance
Discontinuous DO monitoring leads to high aeration energy consumption.
ORP (Organic Reproductive Technology) has difficulty in precisely controlling the dosage of the drug.
Turbidity variations affecting suspended solids control
Manual testing leads to inconsistent results and delayed responses.Manual sampling delays and high labor cost

Online Monitoring Solution For Industrial Wastewater

How To Solve

We provide a complete online monitoring solution covering: pretreatment → process control → emission monitoring.

This includes: online pH/ORP regulation and control, online COD/TOC/ammonia nitrogen monitoring, online turbidity and suspended solids monitoring, chemical dosing and automated control, data logging, trend analysis, and remote monitoring. This solution addresses key issues faced by industrial wastewater treatment plants, such as discontinuous data, slow manual testing, high compliance pressure, and chaotic management.

Solution 1
pH & ORP Online Control

Real-time pH and ORP measurement ensures accurate neutralization and stable chemical reactions. Suitable for acid-base dosing, oxidation tanks, and neutralization basins.
Solution 2
COD / TOC Continuous Monitoring

Continuous organic load monitoring helps prevent overload shocks, reduce treatment costs, and meet discharge limits.
Solution 3
Turbidity / SS Monitoring

Turbidity and suspended solids (SS) sensors ensure sedimentation efficiency and help detect early solid carry-over issues.

Process Flow & Monitoring Points

Industrial wastewater treatment typically involves equalization, pH adjustment, coagulation, biological processing, clarification, and final discharge. Each stage requires continuous online monitoring to control dosing, stabilize process performance, and ensure regulatory compliance.

Process Step	Monitoring Point	Parameters	Objective
Step 1: Equalization	Influent Equalization Tank	pH,ORP,Conductivity	Homogenize wastewater quality and protect downstream biological processes.
Step 2: pH Adjustment	Neutralization Basin	pH,ORP	Provide precise real-time data for automated acid/alkali dosing control.
Step 3: Coagulation Flocculation	Flocculation Tank Outlet	Turbidity,Suspended Solids(SS)	Optimize chemical usage and ensure high-efficiency solid-liquid separation.
Step 4: Anaerobic/Anoxic Treatment	Bio-Reactor (A-Zone)	ORP,Temperature	Monitor redox potential to ensure effective denitrification and phosphorus removal.
Step 5: Aerobic Treatment (Aeration)	Aeration Tank	Dissolved Oxygen (DO),MLSS	Maintain microbial health and optimize aeration energy consumption.
Step 6: Clarification Sedimentation	Secondary Clarifier(Upper Layer)	Turbidity,SS,Sludge Interface	Monitor sludge settling to prevent carry-over and ensure high-quality supernatant.
Step 7: Final Discharge Monitoring	Effluent Discharge Outlet	pH,COD/TOC,NH3-N,Total Phosphorus	24/7 continuous monitoring to guarantee 100% compliance with discharge regulations.

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Technical Capabilities for Water & Wastewater

Supported pH Range	0-14
Accuracy	±0.02 pH/±1 nV ORP
Temperature Range	0-80°C
Output Options	4-20mA / RS485 Hodbus / Relay
Installation Methods	Subnersible / Flow Cell / Pipeline
Turbidity Range	0-4000 NTU
Dissolved Oxygen	0-20mg/L(optical)

Measured Parameters

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Why Choose Us for Wastewater Monitoring?

With over a decade of manufacturing experience, we possess mature capabilities in production, R&D, and supporting services.
Anti-fouling design for sludge and high-solids environments
Real-time stable measurement in harsh wastewater
Long-term stability with minimal calibration
Experience across 1,000+ wastewater sites

Real-World Applications in Industrial Wastewater Management

Textile Factory Wastewater pH Control

Customer Issue：

A large-scale textile plant processes 1,500 m³ of wastewater daily. Extreme pH fluctuations between 5 and 11, leading to high chemical costs and discharge compliance risks.

Solution Applied：

Solution Applied: Installation of 3 units of APX2-C3 controllers paired with industrial-grade pH sensors, utilizing standard Modbus RS485 for centralized monitoring.

Result：
- pH stabilized at ±0.1 pm precision.
- Dosing chemical costs reduced by 18%.
- Fully automated compliance with local environmental standards.
Automated ORP Monitoring for Electroplating Effluent Treatment

Customer Issue：

An electroplating facility specialized in heavy metal surface finishing. Incomplete chemical reactions (cyanide destruction) caused by inaccurate ORP readings and harsh process temperatures.

Solution Applied：

Installation of APX2-C3 controllers supporting 2-point ORP calibration and withstanding process temperatures up to 55°C.

Result：
- Ensured 100% heavy metal precipitation with precise redox potential tracking.
- The IP66-rated enclosure protected electronics from corrosive chemical vapors in the plant.
- Calibration logs (last 100 entries) streamlined predictive maintenance for ORP electrodes.
Textile Factory Wastewater pH Control

Customer Issue：

A large-scale textile plant processes 1,500 m³ of wastewater daily. Extreme pH fluctuations between 5 and 11, leading to high chemical costs and discharge compliance risks.

Solution Applied：

Solution Applied: Installation of 3 units of APX2-C3 controllers paired with industrial-grade pH sensors, utilizing standard Modbus RS485 for centralized monitoring.

Result：
- pH stabilized at ±0.1 pm precision.
- Dosing chemical costs reduced by 18%.
- Fully automated compliance with local environmental standards.

Frequently Asked Questions

Expert answers on water quality monitoring, sensor maintenance, and optimizing aeration efficiency for industrial and municipal wastewater treatment compliance.

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1. How to calibrate a pH sensor for industrial wastewater?

For maximum precision across the full 0-14 pH range, industrial sensors should use 3-point or 5-point calibration (e.g., pH 4.01, 7.00, and 10.01 buffers). Our APX2-G4 controller supports these advanced multi-point methods and features long-line calibration, which automatically compensates for signal loss in extended cables to ensure accuracy in large-scale tanks.

2. What is the difference between membrane and optical DO sensors?

Membrane-based (Polarographic) DO sensors offer fast response times and are highly cost-effective for aeration monitoring, while optical sensors require less frequent maintenance. Our membrane DO solutions are engineered for proven reliability in aquaculture and municipal aeration processes.

3. Why is MLSS monitoring critical in activated sludge processes?

Monitoring Mixed Liquor Suspended Solids (MLSS) is essential for maintaining the correct microbe-to-food ratio (F/M ratio) in aeration tanks. Our TSS analyzers utilize 880nm infrared dual-beam technology to provide stable sludge concentration data without interference from the dark colors common in wastewater.

4. Can ORP be used to monitor disinfection in wastewater treatment?

Yes, Oxidation-Reduction Potential (ORP) is the leading indicator for disinfection efficacy and chemical reaction completion. Our ORP monitoring systems provide real-time redox potential tracking, allowing operators to verify that pathogens are neutralized before discharge.

5. How to integrate water quality sensors with PLC via Modbus RS485?

Integration is achieved by connecting the A/B terminals of the RS485 port and configuring the baud rate and slave ID. Our controllers support standard Modbus RTU and 4-20mA signals, ensuring seamless data transmission to PLC, SCADA, or cloud-based monitoring platforms.

6. What causes pH sensor drift in industrial effluent ?

Sensor drift is typically caused by electrode fouling or reference poisoning. Our systems feature a calibration log that stores the last 100 maintenance data points, enabling predictive maintenance by tracking electrode aging and alerting operators before accuracy is compromised.

7. Does temperature affect conductivity measurements in water analysis?

Absolutely. Conductivity rises with temperature, which is why our sensors include a process temperature range of -20 to 55°C with Automatic Temperature Compensation (ATC). This ensures precise TDS and salinity readings regardless of seasonal temperature fluctuations.

8. How to select the right mounting for water quality controllers?

Mounting depends on the field environment: panel mounting is ideal for control rooms, while wall or pipe mounting (IP66/IP67 rated) is required for outdoor process lines. Our versatile hardware supports all three options, reducing installation complexity and cost.