Fig. 1. Effect of inoculum type on (a) selenate removal and (b) lactate consumption by sludge from waste water treatment plants; (c) selenate removal and (d) lactate consumption by natural inocula. (X) Umicore, (
) Eerbeek, (
) Veendam, (
) Nedalco, (
) soil mining area, (
) river sediment, (
) and sea sediment.