You are here: Home » Past Issues » Volume 8, 2013 - Number 3 » SLOW SAND FILTRATION OF EFFLUENT FROM AN ANAEROBIC DENITRIFYING REACTOR FOR TERTIARY TREATMENT: A COMPARABLE STUDY, USING THREE MOROCCAN SANDS
Imane KADER YETTEFTI1, Fatima Ezzahra ABOUSSABIQ1, Samira ETAHIRI1, Dimitris MALAMIS2 & Omar ASSOBHEI1
1Laboratory of Marine Biotechnology and Environment, Faculty of Science of El Jadida, Morocco;
2School of Chemical Engineering, NTUA, GREECE.
SLOW SAND FILTRATION OF EFFLUENT FROM AN ANAEROBIC DENITRIFYING REACTOR FOR TERTIARY TREATMENT: A COMPARABLE STUDY, USING THREE MOROCCAN SANDS
The aim of this study was to evaluate the feasibility of slow sand filtration as a technique for tertiary treatment of effluent from an anaerobic denitrifying reactor (ADR) treating domestic wastewater. The performance of different Moroccan sand media in tertiary filtration of wastewater has been assessed by conducting pilot-scale filtration assays. The treatment efficiency of a slow sand filtration method depends on several parameters, namely the sand media used, the wastewater characteristics and the organic loading rate. The experimental pilot system consisted of three columns, each one containing a different type of Moroccan sand, namely desert sand (DS), river sand (RS) and beach sand (BS). We found that the optimum hydraulic loading rate at which the effluent is in compliance to water reuse standards equals to 0.16 m/h for all sand filters. Additionally, the RS filter showed the highest pollutant removal efficiency at 0.16 m/h, namely 88% of COD, 86% of TSS, 72% of TKN, 76% of NH4-N, 65% of TP, 2.4 log-units of FC and 2.7 log-units of FS. The effectiveness of the RS filter is found to be attributed to the highest Al2O3, Fe2O3 and OM content as well as to the smaller particle size of the sand incomparison to DS and BS filters.
Keyword: Wastewater, sand characteristic, slow sand filtration, tertiary treatment, water reuse.
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