Noses for Surveillance of Wastewater from Secondary Treatment Plants in Alexandria, Egypt

24.08 2014

Ehab I. Mohamed, Marwa M. Tala, Samaa M. Zaki, Ibrahim A.B.El Assar, Amani M. Bayoumi and Fatma M. El-Demerdash.

The 2014 World Congress - Advances in Civil, Environmental and Material Research  (ACEM 14) - Busan, Kores, August 24-28 ,  2014. 

 

Intermittent discharges of industrial chemical pollutants into sewers can have a damaging effect on the processes involved in treating wastewater. They are sometimes able to pass through treatment plants and enter into the receiving water, to exert a harmful effect on the environment and possibly pass down a river to the intakes forwater supplies. We evaluated the use of an electronic nose (E-Nose) consisting of ten non-specific metal oxide sensors for monitoring odors of wastewater from influent and effluent samples at three different wastewater secondary treatment plants in Alexandria, Egypt, over a 7-month period in association with causes of odor by standard laboratories of chemical analysis. We analyzed E-Nose sensor responses of all plants using the principal component analysis (PCA), which allowed interpretation and differentiation of samples in terms of origin and quality along the study period. E-Nose sensor responses for influent and final effluent samples from the three secondary treatment plants were significantly associated with Hydrogen Sulphide, Ammonia and Nitrate. Thus, the E-Nose can be used as a rapid alarm generator towards volatile compounds, e.g. in specific advanced treatment processes to produce claimed water from effluent of the domestic wastewater treatment plant under scrutiny... 
Wastewater arriving at sewage treatment plants is highly variable in nature, due to the diurnal nature of human activity and the environmental factors such as rainfall, in addition to shorter term variability effects due to intermittent or accidental discharges of chemical pollutants into sewers (Baawain 2013, Leusch 2013). These latter discharges, usually of industrial origin, can have a damaging effect on the processes involved in treating wastewater and are sometimes able to pass through treatment plants and ...