SOLiSENZ

The SOLiSENZ Sludge Treatment Measurement system offers valuable insights into the operation of the treatment process, enabling real-time control and optimisation of the decanter, polymer dosing, and sludge feed. The system comprises four different sensors: a low-range sludge feed TSS sensor (LSZ; 0-100 g/L), a residual polymer sensor (PSZ), a centrate TSS Sensor (CSZ) and a high-range dry cake TSS Sensor (HSZ).

The low-range sludge feed TSS sensor (LSZ) is an ultrasonic backscattering sensor. The principle of ultrasound suspended solids measurements in water is based on two key acoustic parameters: absorption, which measures the conversion of ultrasonic energy into heat upon reaching a particle in the water, and scattering, which occurs when an ultrasonic wave encounters a particle and radiates part of its energy in various spatial directions. Ultrasonics utilises frequencies ranging from approximately 16 kHz to 1 GHz, and its quasi-optical propagation behaviour is specifically suitable for detecting suspended solids in water at levels where (near infrared) optical detection mechanisms struggle. Ultrasonic backscattering is typically measured at an angle of 175°

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