TSS (Total Suspended Solids) : Monitoring Suspended Solids for Sustainable Water Management
TSS refers to the dry weight of particles that are not dissolved in water and are larger than 2 micrometers. Typically, it is measured by filtering a water sample through a membrane filter, then drying and weighing the residue. The result is expressed in mg/L, a critical figure indicating the cleanliness or contamination level of a water system.
Why is TSS Data Often Misinterpreted?
Operators often mistakenly assume that a high TSS value always equals "dirty water." In reality, several factors can lead to data discrepancies:
- Varying Measurement Methods: Lab-based gravimetric analysis and online TSS Sensors may yield different results. Optical sensors measure light scattering, which can be influenced by water color.
- Improper Sampling Points: Heavy sediments often settle at the bottom. A single-point sample may not reflect the true average TSS concentration.
- Environmental Impact: Heavy rain can cause temporary "spikes" in TSS due to runoff, which is not necessarily a failure of the treatment system.
- Lack of Calibration: Without scheduled calibration, a TSS Sensor may suffer from signal drift, causing 10-15% inaccuracy.
TSS Measurement Methods
Modern technologies offer various ways to measure TSS depending on the application:
- Gravimetric Method: The highly accurate reference standard, though it requires time-consuming laboratory analysis.
- Optical Scattering: Commonly used in Online TSS Sensors for fast response and continuous monitoring in wastewater systems.
- Optical Transmission: Ideal for measuring high-turbidity water, such as concentrated industrial wastewater.
Factors Affecting TSS Measurement Accuracy
Sensor selection and placement are vital. Particle size, composition, and hydraulic flow conditions all impact the reading. Additionally, biofouling (slime accumulation) on the sensor lens is a key concern for long-term monitoring.
Recommended TSS Meters and Sensors from E-Power
TSS Total Suspended Solids Sensor (Fiber Optic 135°)
1. Designed to solve environmental interference using fiber optic technology.
- Highlights: Uses 135° Backlight Detection to compensate for water color and external light.
- Special Features: Sapphire window to prevent scale; features an automatic self-cleaning system to remove bubbles and debris.
- Application: Ideal for continuous online monitoring in fluctuating water systems.
2. Remond RS485 Sludge Concentration / TSS Probe (RMD-ISSN105)
A durable and cost-effective probe for both TSS and Sludge Concentration (MLSS).
- Highlights: Uses 90° Scattered Light principle for fast and accurate response.
- Special Features: Robust Stainless Steel housing with IP68 waterproofing, suitable for direct immersion in rivers or wastewater.
- Application: Widely used in Wastewater Treatment Plants (WWTP) and irrigation.
A premium sensor utilizing advanced technology for sensitive measurements.
- Highlights: Infrared Optical Absorptiometry provides high precision across diverse conditions, from drinking water to industrial waste.
- Special Features: Extremely stable design that minimizes the need for frequent calibration, reducing long-term maintenance costs.
4. SUP-PTU8011 Turbidity & TSS Sensor (ISO7027 Standard)
The definitive solution for those requiring data compliant with international standards.
- Highlights: Complies with ISO7027 using Infrared Double Scattering, ensuring readings are unaffected by water chroma (color).
- Application: Ideal for high-reliability requirements like water treatment plants or discharge monitoring.
Conclusion : TSS is a "Trend," Not Just an Absolute Number
Experts view a single TSS reading as a snapshot. The real value lies in Trend Analysis provided by continuous monitoring systems. This data reveals how a system responds to changes, allowing for timely process adjustments.
If you are looking for an industrial-grade TSS Sensor or a Water Quality Monitoring system, E-Power is ready to provide expert consultation and the most accurate tools for your water management needs. Visit us at www.epower.co.th.
