Evaluation of the physicochemical parameters of domestic wastewater treated by the slow filtration technique on charcoal, sand and Gravel of the city of Conakry - Guinea

Sciences

This study is a continuation of our research work on wastewater management. Its main objective is to determine certain physicochemical parameters of samples of domestic wastewater treated by the technique of slow filtration on charcoal, sand and gravel, from the five municipalities of the city of Conakry. It took place during the months of September and October 2021. The physicochemical parameters of the samples after treatment varied as follows: temperature from 28.30°C to 27°C; the pH from 7.28 to 6.96; electrical conductivity (EC) from 1238μs/cm to 1280μs/cm; turbidity 423.98 NTU to 17.96 NTU; alkalinity (CaCO3) from 203.60 mg/l to 135.40 mg/l; Suspended Solids (MeS) from 310 mg/l to 29 mg/l; dissolved oxygen (O2) from 2.02 mg/l to 4.44 mg/l; the Biological Oxygen Demand (BOD5) from 156.59mgO2/l to 68.50mgO2/L; Chemical oxygen demand (COD) from 138.19mgO2/l to 65.50mgO2/L; Nitrites (NO2-) 0.04 mg/l to 0.0019mg/l; Nitrates (NO3-) from 2.16mg/l to 0.02mg/l; ammonium (NH4+) from 45.62mg/l to 12.40mg/l and phosphates (PO43) from 0.26mg/l to 0.0008mg/l. The results obtained showed that the technique of wastewater treatment by filtration on charcoal, sand and gravel made it possible to improve the quality of the wastewater samples. Thus, they can be discharged into receiving environments or be reused in various fields, such as: washing machines, flushing toilets, gardening, watering, market gardening, irrigation, etc. This treatment technique is local, economic and environmental, so it remains to be encouraged and popularized in rural and urban areas.

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