Crushed recycled glass as a filter medium and comparison with silica sand

Abstract

Crushed recycled glass as a filter medium and comparison with silica sandThe objective of this work was to evaluate crushed recycled glass as a medium for rapid filtration. In the first part of this work, physical and hydraulic characteristics of the glass medium were studied. In the second part, pilot scale inline filtration experiments were carried out using raw waters from three different water sources. Two physically identical filter columns were operated in parallel in all the experiments. One filter contained a silica sand medium that is widely used in Turkey, whereas the other filter contained crushed recycled glass. Experiments were repeated five times as follows: (i) Without the use of a coagulant, (ii-iii) with 5 mg/L and 10 mg/L of alum, and (iv-v) with 5 mg/L and 10 mg/L of ferric chloride. Turbidity, particle counts, and head losses were measured and compared as functions of time. The following were observed: (1) Provided that a coagulant was used, the filter containing crushed glass produced effluent turbidities and particle counts similar to those obtained with the sand filter. (2) The crushed glass medium generated both a smaller clean-bed head loss and smaller clogging head losses than those of the sand filter. It is concluded that crushed glass shows significant promise as an alternative to silica sand in rapid filtration.

Filtration Process and Alternative Filter Media Material in Water Treatment

“…The single media filters showed comparable removal efficiencies for both turbidity and particle count; the head loss was lower for glass (up to 50%). Fluidisation experiments led to similar expansions for the glass and the sand filters, with small differences at higher backwash rates [58]. Similar observations were obtained with dual media configurations; a slightly increased effectiveness towards turbidity was measured for glass/anthracite.…”

“…The number of influent particles, however, varied between the runs; the average for the glass was 500-1000 particles/mL, while for the sand filter it was 1000-1500. Soyer et al [57,58] looked at both single and dual media configurations for gravity filtration in two different studies. The recycled glass used in the study was once again not specifically manufactured for water filtration purposes.…”

Media filter fouling assessment using optical coherence tomography: New methodology

“…Even though silica sand is the most common filter media for micro irrigation (Nakayama et al, 2007), other materials such as recycled glass have been used because they exhibit similar or better filter removal efficiencies (Soyer et al, 2010), this option makes sense in particular in places where sans source are getting scarce. Thus, a commercial filtration media produced with clear glass, which presented a more homogeneous response at OCT observation than silica sand, was selected for this study.…”

Optimising the Design of Fe0-Based Filtration Systems for Water Treatment: The Suitability of Porous Iron Composites

“…The discussion of porosity loss due to the accumulation of foreign precipitates is out of the scope of this study. Such systems have been used in water and wastewater treatment for decades [90][91][92][93][94][95][96][97][98][99][100].…”