Effects of cadmium on the performance and microbiology of laboratory-scale lagoons treating domestic sewage.
Two experiments were performed to assess the impact of cadmium on the sewage lagoon wastewater treatment process. For each one, three laboratory-scale pilot plants with one tank receiving the same raw effluent were used; one plant served as control and the other two were contaminated once only with cadmium. In the first study, the effects of a shock load of two concentrations of cadmium chloride (60 and 300 micrograms/l) on the plant performance, microbial populations (protists and bacteria) and enzyme activities were determined. Initially, most of the performance parameters were affected concentration-dependently. A reduction in the protist population density and some influence on the total bacterial population were observed, and the potential enzymatic activities were also modified. A second experiment with a lower cadmium concentration (30 micrograms/l), supplied as chloride or sulphate, still perturbed most of the parameters studied, and the effects of the two cadmium salts were identical.
Bonnet
J L
JL
Laboratoire Biologie Comparée des Protistes, UPRESA CNRS 6023, Université Blaise Pascal, Aubiere, France.
Bohatier
J
J
Pépin
D
D
D001419:Bacteria / Q000187:drug effects / Q000378:metabolism; D002104:Cadmium / Q000737:chemistry / Q000633:toxicity*; D019256:Cadmium Chloride / Q000737:chemistry / Q000633:toxicity; D019187:Cadmium Compounds / Q000737:chemistry / Q000633:toxicity; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D004798:Enzymes / Q000032:analysis; D008954:Models, Biological; D013431:Sulfates / Q000737:chemistry / Q000633:toxicity; D014865:Waste Disposal, Fluid; D014871:Water Microbiology
D019187:Cadmium Compounds; D004798:Enzymes; D013431:Sulfates; D002104:Cadmium; C037123:cadmium sulfate; D019256:Cadmium Chloride