Wastewater treatment water quality testers are at the heart of water quality analysis and monitoring equipment, and the 2025 market offers a wide range of advanced options to meet the diverse needs of industrial, municipal, and agricultural wastewater management.This report explores in detail the equipment types, test parameters, international standards, and selection guidelines designed to help users quickly understand and optimise wastewater treatment processes.
Wastewater treatment water quality testing is a critical step in ensuring environmental safety and public health.Wastewater can contain bacteria, chemical pollutants and solid particles that, if discharged directly without treatment, can pollute rivers and lakes, endangering ecosystems and drinking water sources.2025 Advanced monitoring equipment helps businesses and municipalities to comply with international and local regulations and to protect natural resources through accurate analyses.
According to demand, sewage treatment water quality testing equipment can be divided into the following categories:
- Portable Test Kits: These units, such as Martek Marine's Wastewater Test Kits, are designed to be simple and suitable for use in the field. They comply with ISO 17381:2003 and measure pH, suspended solids and chemical oxygen demand (COD), providing fast, cost-effective results that are particularly suited to ships and small installations.
- Sensors and Probes: Renke offers a wide range of sensors including pH sensors, conductivity sensors and turbidity sensors for industrial wastewater monitoring. These sensors detect parameters such as dissolved oxygen and ammonia nitrogen in real time through light scattering or fluorescence measurement techniques, making them suitable for complex environments.
- Portable meters: such as Hanna Instruments' HI83399 series, a photometric laboratory analyzer that measures more than 40 water quality parameters, providing laboratory-grade accuracy for scenarios requiring detailed analysis.
- Online monitoring systems: These systems continuously track water quality, with data uploaded via an Internet of Things (IoT) cloud platform, and are suitable for large wastewater treatment plants. an example is Renke's Renke Portable Water Quality Meter, which supports remote monitoring and data analysis.
The following is a detailed breakdown of sensor types, based on information provided by ERUN:
Sensor type | Description | Measuring range/accuracy | Applicable scenarios |
pH sensor | Monitor hydrogen ion concentration, suitable for non-corrosive weak acid and alkali environments | N/A | Industrial wastewater, domestic sewage |
Conductivity sensor | Measures conductivity, reflecting total dissolved solids (TDS), electrode, inductive, ultrasonic | 0~20000μS/cm，±1%FS error | Industrial wastewater, surface water |
Turbidity sensor | Measure suspended particles by light scattering, calculate concentration | N/A | River, wastewater, sewage |
Dissolved Oxygen Sensor | Monitors molecular oxygen, measured using fluorescence, no oxygen consumption | N/A | Aquaculture, seawater quality |
ORP sensor | Measures redox potential, reflecting the redox state of the solution, using high purity platinum electrodes | N/A | Cyanide/chromium-containing industrial wastewater |
COD sensor | Measure chemical oxygen demand, use 254nm UV light, compensate for turbidity | N/A | Industrial wastewater, pollution monitoring |
Ammonia sensor | Measures free ammonia (NH3) and ammonium ions (NH4+), automatically compensates for temperature/pH | N/A | Aquaculture, Rivers, Oceans |
These devices are designed with safety and environmental considerations in mind and comply with ISO standards to ensure reliable results.
Key Test Parameters The Wastewater Treatment Water Quality Tester measures the following parameters, which reflect the quality of the wastewater:
- pH: pH affects the treatment process, too high or too low may corrode equipment or affect biological treatment.
- Chemical Oxygen Demand (COD) and Biochemical Oxygen Demand (BOD): assesses the level of organic pollution, COD reflects total organic matter and BOD shows the oxygen required for microbial decomposition, commonly found in industrial wastewater.
- Turbidity: measures suspended particles, affecting water clarity and filtration efficiency, particularly important in rivers and sewage treatment plants.
- Ammoniacal Nitrogen: monitors nitrogen pollution from sources such as agricultural fertilizers and industrial discharges, excessive levels can lead to eutrophication.
- Conductivity: Reflects total dissolved solids and indicates salinity and pollution levels, commonly found in surface water and wastewater.
International Standards and Compliance International standards provide guidance on water quality testing for wastewater treatment, ensuring reliability and consistency of equipment and results:
- ISO 17381:2003: specifies the selection and application of portable test kits for drinking water, river water, process water and wastewater analysis, emphasizing safety and environmental requirements
- World Health Organization (WHO) Guidelines: Provides recommendations for the safe management of wastewater, emphasizing the safety of discharge and reuse, and is suitable for global use.
- MARPOL ANNEX IV: for discharging wastewater from ships, requiring periodic testing for pH, suspended solids, etc., commonly used with the Martek Marine suite.
These standards help users to ensure compliance and reduce legal risks.
Selection Guide The following factors need to be considered when choosing the right wastewater treatment water quality tester:
- Application scenarios: choose portable kits or sensors for on-site testing, such as ERUN's pH sensors; and on-line systems for large facilities.
- Parameter coverage: Ensure that the equipment is capable of testing all required parameters, such as COD, BOD and turbidity, to meet regulatory requirements.
- Compliance: Choose equipment that complies with ISO 17381:2003 and WHO guidelines to ensure credible results.
- Budget: Choose cost-effective kits for small-scale operations; invest in advanced sensors such as ERUN Instruments' ERUN-SZ for larger facilities.
Contact ERUN for more support at +86 18166600151 or nawei@xayingrun.com
