ABSTRACT
The concentration of copper ions in dilute solutions is less than 5 gl[-1], which is unsuitable for conventional electrolysis cells. Non-conventional cells with relatively large cathodic area are essential. Packed column, three-dimensional particulate electrode cell [PCE] has been investigated. The effect of cathodic current densities, initial copper concentrations, free sulphuric acid concentration and rate of flow of the solution on both cathodic current efficiency and power consumption were determined. The effect of the presence of iron and zinc cations on the electrowinning process was studied. Copper could be removed to less than 5 ppm with current efficiencies of about 88%.
Subject(s)
Waste Management/methods , Electrolysis , Electrodes , Microscopy, Electron, Scanning , Waste Products , Water PollutionABSTRACT
553 faecal samples from food handlers in Dakahlia Governorate were examined for intestinal pathogens. Pathogenic bacteria were isolated from 43 cases, of which 20 isolates were Shigella, 15 Salmonella and 8 E. coil. Sh. flexneri and Sal. paratyphi [B] were the most common organisms. Faecal samples of 226 cases had one or more intestinal parasites, as E. histolytica, S. mansoni, Ascaris, and some few other parasites. The role of food handlers as a potential hazard in transmission of these intestinal pathogens was discussed