TREATMENT OF BELBAS WATER DRAIN USING CONSTRUCTED FREE SURFACE FLOW (FSF) AND FLOATING AQUATIC PLANTS (FAP)

للكاتب

USAMA F. MAHMOOD

Department of Civil Engineering , AL-AZHAR University, Cairo, Egypt

.

ABSTRACT

The pilot-scale constructed wetland contains two cells (1) Free Surface Flow (FSF) and (2)

Floating Aquatic Plant (FAP) for treatment of Belbas water drain. The treatment system

consist of Free Surface Flow constructed wetland with loading rate and hydraulic residence

time of 29.6 kg BOD ha-1 day-1and 2 days, and Floating Aquatic Plant with loading rate andhydraulic residence time of 32.74 kg BOD ha-1day-1 day-1and 2 days, respectively . The

wetland system was highly effective in treating the water drain ; median removal efficiencies

of BOD5 (biological oxygen demand),COD (Chemical Oxygen Demand) and TSS (total

suspended solids) were about 58%,53% and 83% with median effluent concentrations of

30.5,55.2 and 25.7 mg/L, respectively. Average ammonia-nitrogen (NH3-N) concentrations

decreased approximately by 62%, leading to an efficient design for high nitrification rate due

to dissimulator reduction or plant uptake. Total phosphorus (P) concentration reductions was

of 65%. The common macrophyte in Egypt Typha latifolia (cattail) was used at a planting

density of one plant/m2 and Water hyacinths at a planting density of 1 Kg / m2 .

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