The results with respect to the toxicity effects of metal pollution on microorganisms in the Lapus and Sasar Rivers, from the Baia Mare mining area are reported in this paper. Toxicity tests were conducted using the ToxTracer system, which is based on the inhibition of Vibrio fisheri luminescence. The bioluminescence inhibition of Vibrio fisheri, ranged between 30-80% and 50-80% for Lapus and Sasar respectively. The inhibition data was then compared

The capacity of anaerobic granular sludge to remove selenate from contaminated wastewater was investigated. The potential of different types of granular sludge to remove selenate from the liquid phase was compared to that of suspended sludge and contaminated soil and sediment samples. The selenate removal rates ranged from 400 to 1500 µg g VSS-1 h-1, depending on the source of biomass, electron donor, and the initial selenate concentration. The