Coagulation-flocculation As A Submerged
Biological Filter Pre-treatment With
Landfill Leachate
Author(s)
A. Gálvez Perez, A. Ramos, B. Moreno
& M. Zamorano Toro1,2
Abstract
Landfill leachate may cause environmental problems if it is not properly
managed and treated. An appropriate treatment process of landfill leachate often
involves a combination of physical, chemical and biological methods to obtain
satisfactory results. In this study, coagulation-flocculation was proposed as a pretreatment
stage of partially stabilized landfill leachate prior to submerged
biological filters. Several coagulants (ferric, aluminium or organic) and
flocculants (cationic, anionic or non-ionic) were assayed in jar-test experiments
in order to determine optimum conditions for the removal of COD and total
solids. Among the cationic flocculants, that of highest molecular weight and
cationicity (CV/850) showed highest removal efficiencies (15% COD and 8%
TS). Organic and aluminium coagulants showed better results than ferric
coagulants. Coagulant removal efficiencies were between 9% and 17% for COD
and between 10% and 15% for TS. Doses of 1 ml/l of coagulant were preferred.
Some combinations of coagulant and flocculant enhanced the process. The best
combinations obtained were FeCl3+A30.L, Ferriclar+A20.L, SAL8.2+A30.L and
PAX-18+A30.L, which presented COD removal efficiencies between 24% and
37% with doses between 10 and 18 ml/l.
Keywords: landfill leachate, coagulation-flocculation, submerged biological
filter pre-treatment.
Keywords
landfill leachate, coagulation-flocculation, submerged biological
filter pre-treatment.
Related Book
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