title: Water reduction in waste-activated sludge by resettling and filtration in batch. Phase (1): pilot-scale experiments to optimize performance.
abstract: This article describes an effective procedure for reducing the water content of excess sludge production from a wastewater treatment plant by increasing its concentration and, as a consequence, minimizing the volume of sludge to be managed. It consists of a pre-dewatering sludge process, which is used as a preliminary step or alternative to the thickening. It is made up of two discontinuous sequential stages: the first is resettling and the second, filtration through a porous medium. The process is strictly physical, without any chemical additives or electromechanical equipment intervening. The experiment was carried out in a pilot-scale system, consisting of a column of sedimentation that incorporates a filter medium. Different sludge heights were tested over the filter to verify the influence ofhydrostatic pressure on the various final concentrations of each stage. The results show that the initial sludge concentration may increase by more than 570% by the end of the process with the final volume of sludge being reduced in similar proportions and hydrostatic pressure having a limited effect on this final concentration. Moreover, the value of the hydrostatic pressure at which critical specific cake resistance is reached is established.
authors: Arturo
authors: A
authors: Trapote
authors: Margarita
authors: M
authors: Jover
authors: Pablo
authors: P
authors: Cartagena
authors: Marouane
authors: M
authors: El Kaddouri
authors: Daniel
authors: D
authors: Prats
mesh_terms: D005374:Filtration; D010865:Pilot Projects; D012722:Sewage; D018505:Waste Management / Q000379:methods*
chemical_list: D012722:Sewage