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۱Treatment of Municipal and Industrial Wastewater Effluents Using Integrated Schemes
اطلاعات انتشار: World Applied Sciences Journal، بيست و ششم،شماره۸، ۲۰۱۳، سال
تعداد صفحات: ۷
The motivations for wastewater treatment are numerous due to its environmental and economic merits. An integrated scheme comprising chemical coagulation followed by adsorption was developed for the treatment of different sources of wastewater in order to remove heavy metals and reduce the chemical oxygen demand (COD). Effluents of industrial wastewater rich in Nickel (Ni) and Chromium (Cr) as well as mixed domestic and industrial wastewater from the Egyptian industrial city of Tenth of Ramadan were treated. Chemical treatment was conducted using alum, ferrous sulfate and lime. The optimum dose of coagulant required for the removal of each heavy metal was determined. A consecutive batch adsorption onto Calcium– Bentonite (Ca–B) was undertaken to improve heavy metal removal efficiencies. For the industrial wastewater, Ni was completely removed during the coagulation step using 200 mg\l lime, while 98% of Cr was removed using the integrated scheme with 300 mg\l ferrous sulfate as a coagulant. For the mixed wastewater, chemical treatment reduced COD with an efficiency up to 78% depending on the employed coagulation dose. Furthermore, complete removal of Cr was achieved using all tested coagulants at 100 mg\l, whereas Lead (Pb) was completely removed using alum at 100 mg\l. Complete removal of Ni and Cadmium (Cd) were also achieved using the integrated scheme. Moreover, a pilot–scale tertiary separation system (TriSep) was tested for the treatment of both synthetic and real wastewater samples enriched with Cr and Ni. Almost complete removal efficiencies for both metals was accomplished.
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