Numerical modeling and control of solids separation using continuously moving fine mesh filters

Abstract

h i g h l i g h t s Cake resistance can be measured by drainage column with continuous level monitoring. Cake resistance can be scaled based on suspended solids in influent sample. A PID controller can maintain water level when suspended solids concentration varies. A one-dimensional process model can accurately predict filter performance.

Dynamic model validation and advanced polymer control for rotating belt filtration as primary treatment of domestic wastewaters

“…previously by DeGroot et al (DeGroot et al, 2015) and Sherratt et al (Sherratt et al, 2018a) and is here briefly reported to ease the understanding of the mathematical structure of the model.…”

“…In the present model, the flow passed through the filter is identified according to the principles illustrated in DeGroot et al (2016) and Sherratt et al (2018a). Specifically, the approach is based on Darcy's law, according to which the velocity (U) of a liquid through a porous media is directly proportional to the pressure drop (ΔP) and inversely proportional to the dynamic viscosity (µ) and the media resistance (R), mathematically expressed as follows:…”

Carbon Footprint and Energy Recovery Potential of Primary Wastewater Treatment in Decentralized Areas: A Critical Review on Septic and Imhoff Tanks

“…The fundamental working principle of these technologies is based on physical and/or biological processes. Specifically, while some PTTs typically remove suspended solids only through physical processes such as settling [13] or filtration [14][15][16][17], other PTTs such as septic and Imhoff tanks incorporate an additional removal mechanism, namely anaerobic digestion [18,19]. The latter occurs consequently to the fact that, differently from primary clarifiers or rotating filters where separated solids are continuously removed, within septic and Imhoff tanks the solids are allowed to accumulate in the system over long periods.…”