02197    a2200313   4500001001100000005001700011008003900028020001800067037003600085040000700121041000800128072001500136072001500151072001400166072001300180072001400193072001200207072002100219072002100240072002100261072001700282100002400299245010900323250000600432260002400438300001000462520139600472999001501868113834331520250317100410.0250312042018xx                   eng    a9781138343313  bTaylor & FranciscGBP 62.99fBB  a01  aeng7 aRBK2thema7 aKNB2thema7 aTN2thema7 aRBK2bic7 aKNBW2bic7 aTN2bic7 aSCI0260002bisac7 aTEC0090202bisac7 aTEC0100302bisac7 a628.32bisac1 aLuis Reyes-Alvarado10aOptimization of the Electron Donor Supply to Sulphate Reducing Bioreactors Treating Inorganic Wastewater  a1  bCRC Pressc20180912  a234 p  bThe main objective of this research was to optimize the electron donor supply in sulphate reducing bioreactors treating sulphate rich wastewater. Two types of electron donor were tested: lactate and slow release electron donors such as carbohydrate based polymers and lignocellulosic biowastes. Biological sulphate reduction was evaluated in different bioreactor configurations: the inverse fluidized bed, sequencing batch and batch reactors. The reactors were tested under steady-state, high-rate and transient-state feeding conditions of electron donor and acceptor, respectively. The results showed that the inverse fluidized bed reactor configuration is robust and resilient to transient and high-rate feeding conditions at a hydraulic retention time as low as 0.125 d. The biological sulphate reduction was limited by the COD:sulphate ratio (< 1.7). The results from artificial neural network modelling showed that the influent sulphate concentrations synergistically affected the COD removal efficiency and the sulphide production. Concerning the role of electron donors, the slow release electron donors allowed a biological sulphate reduction > 82% either using carbohydrate based polymers or lignocellulosic bio-wastes, in batch bioreactors. The biological sulphate reduction was limited by the hydrolysis-fermentation rate and by the complexity of the slow release electron donors.  c2192d2192