02312    a2200361   4500001001100000005001700011008003900028020001800067037003600085040000700121041000800128072001500136072001500151072001500166072001500181072001500196072001400211072001400225072001300239072001300252072001400265072001400279072001200293072002100305072002000326100003200346245011800378250000600496260002400502300001000526520139900536999001501935113800166X20250317100416.0250312042013xx                   eng    a9781138001664  bTaylor & FranciscGBP 82.99fBB  a01  aeng7 aPSB2thema7 aRBK2thema7 aTCB2thema7 aKNB2thema7 aTDC2thema7 aTN2thema7 aPSBT2bic7 aRBK2bic7 aTCB2bic7 aKNBW2bic7 aTDCB2bic7 aTN2bic7 aTEC0090202bisac7 a621.48332bisac1 aDenys Kristalia Villa Gomez10aSimultaneous Sulfate Reduction and Metal Precipitation in an Inverse Fluidized Bed ReactorbUNESCO-IHE PhD Thesis  a1  bCRC Pressc20131018  a200 p  bIndustrial activities like textile processing and mining are typical sources of heavy metal-rich wastewaters. The sulfate reducing process has become an attractive method for the production of sulfide to precipitate metals since most of these streams also contain sulfate, which is the electron acceptor and, in less common cases, chemical oxygen demand which is the electron donor of sulfate reducing bacteria. The inverse fluidized bed (IFB) reactor is a system for the production of biogenic sulfide and metal precipitation in the same unit due to its configuration: the biomass floats on top of the reactor, whereas metal sulfide precipitates settle and thus can be recovered at the bottom. The main objective of this thesis was to elucidate the factors affecting simultaneous sulfate reduction and precipitation of heavy metals in an IFB reactor in order to optimize the metal recovery from wastewaters such as acid mine drainage. Therefore, this thesis focused on varying different operational conditions to study their effect on the solid-liquid separation and purity of the metal sulfide precipitates as well as on their effect on the sulfate reducing process. Furthermore, one chapter was focused on the study of strategies for sulfide control in the IFB reactor. In addition, recommendations for further research to improve the recovery of the metal sulfides in bioreactors are given.  c2890d2890