Fig. 2. Effect of electron donor (20 mM) on selenate removal by sludge Eerbeek incubated with 0.5 mM selenate. (a), (b) Selenate removal, and (c), (d) organic substrate consumption, with (•) propionate, (-) methanol, (
) acetate, (
) ethanol, (
) lactate, (
) sucrose, (
) casein, (
) glucose, (X) sterile reference and (
) no substrate addition (endogenous substrate). Note that sucrose, glucose, and casein consumption was not determined.