Efficiency of the activated sludge system of an electrical equipment industry
Keywords:Industrial efluent treatment, Microfauna, Liquid effluent
Liquid effluent generation in industrial plants is associated with production processes and employees. Based on the current legislation, these effluents must be subjected to treatment processes in order to be discharged at acceptable levels in receiving waterbodies. The company evaluated in the current study manufactures household and industrial tools and instruments; thus, the aim of the current study is to assess the activated sludge-based effluent treatment system adopted by it. Microscopic analyses of microfauna and biological floc structure, as well as sludge physicochemical and sedimentability analyses, were carried out. The sludge was classified as Pin-Point. Although Arcella sp. prevalence has given sludge a satisfactory clearance feature, the presence of Aspidisca sp. and Trachelophyllum sp. in it has indicated nitrification process and significantly old sludge, respectively. These features combined to low protozoan diversity and lack of micrometazoa have evidenced that sludge quality can be improved. Moreover, sludge overall presented poor settleability. Finally, improvements in the activated sludge system were suggested based on results observed in the current study.
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