(NL9200927-A)      Sulphur cpds. are removed from water by anaerobic treatment with sulphur and/or sulphate reducing bacteria, with addn. of an electron donor (ED). The consumption of ED is reduced by (a1) keeping sulphate concn. in the anaerobic effluent at least 0.5 g/l; (a2) keeping sulphite concn. in this effluent at least 0.1g/l; (b) keeping salt concn. (expressed as Na ion equiv.) in the reactor medium at least 6g/l under mesophilic conditions or at least 3g/l under thermophilic conditions; (c) keeping sulphide concn. in the effluent at least 0.1g/l and/or (d) adding to the medium an inhibitor (A) which is more toxic to CH4-producing bacteria than to incompletely oxidising sulphate-reducing bacteria or sulphate-reducing bacteria which oxidise one C cpds. Pref. the biofilm thickness of anaerobic bacteria is below 0.5mm, esp. maintained by strongly turbulent conditions.    USE/ADVANTAGE -   The method is esp. used to regenerate wash liquor used to scrub S-contg. flue gases, but can also be applied to groundwater, mining effluents, industrial waste water, etc. By reducing the consumption of ED (because under the specified conditions little if any CH4 is produced) costs are reduced.    (EP642472-A1)      Sulphur cpds. are removed from water by anaerobic treatment with sulphur and/or sulphate reducing bacteria, with addn. of an electron donor (ED). The consumption of ED is reduced by (a1) keeping sulphate concn. in the anaerobic effluent at least 0.5 g/l; (a2) keeping sulphite concn. in this effluent at least 0.1g/l; (b) keeping salt concn. (expressed as Na ion equiv.) in the reactor medium at least 6g/l under mesophilic conditions or at least 3g/l under thermophilic conditions; (c) keeping sulphide concn. in the effluent at least 0.1g/l and/or (d) adding to the medium an inhibitor (A) which is more toxic to CH4-producing bacteria than to incompletely oxidising sulphate-reducing bacteria or sulphate-reducing bacteria which oxidise one C cpds. Pref. the biofilm thickness of anaerobic bacteria is below 0.5mm, esp. maintained by strongly turbulent conditions.    USE/ADVANTAGE -   The method is esp. used to regenerate wash liquor used to scrub S-contg. flue gases, but can also be applied to groundwater, mining effluents, industrial waste water, etc. By reducing the consumption of ED (because under the specified conditions little if any CH4 is produced) costs are reduced.    (JP7506533-W)      Sulphur cpds. are removed from water by anaerobic treatment with sulphur and/or sulphate reducing bacteria, with addn. of an electron donor (ED). The consumption of ED is reduced by (a1) keeping sulphate concn. in the anaerobic effluent at least 0.5 g/l; (a2) keeping sulphite concn. in this effluent at least 0.1g/l; (b) keeping salt concn. (expressed as Na ion equiv.) in the reactor medium at least 6g/l under mesophilic conditions or at least 3g/l under thermophilic conditions; (c) keeping sulphide concn. in the effluent at least 0.1g/l and/or (d) adding to the medium an inhibitor (A) which is more toxic to CH4-producing bacteria than to incompletely oxidising sulphate-reducing bacteria or sulphate-reducing bacteria which oxidise one C cpds. Pref. the biofilm thickness of anaerobic bacteria is below 0.5mm, esp. maintained by strongly turbulent conditions.    USE/ADVANTAGE -   The method is esp. used to regenerate wash liquor used to scrub S-contg. flue gases, but can also be applied to groundwater, mining effluents, industrial waste water, etc. By reducing the consumption of ED (because under the specified conditions little if any CH4 is produced) costs are reduced.    (JP2799247-B2)      Sulphur cpds. are removed from water by anaerobic treatment with sulphur and/or sulphate reducing bacteria, with addn. of an electron donor (ED). The consumption of ED is reduced by (a1) keeping sulphate concn. in the anaerobic effluent at least 0.5 g/l; (a2) keeping sulphite concn. in this effluent at least 0.1g/l; (b) keeping salt concn. (expressed as Na ion equiv.) in the reactor medium at least 6g/l under mesophilic conditions or at least 3g/l under thermophilic conditions; (c) keeping sulphide concn. in the effluent at least 0.1g/l and/or (d) adding to the medium an inhibitor (A) which is more toxic to CH4-producing bacteria than to incompletely oxidising sulphate-reducing bacteria or sulphate-reducing bacteria which oxidise one C cpds. Pref. the biofilm thickness of anaerobic bacteria is below 0.5mm, esp. maintained by strongly turbulent conditions.    USE/ADVANTAGE -   The method is esp. used to regenerate wash liquor used to scrub S-contg. flue gases, but can also be applied to groundwater, mining effluents, industrial waste water, etc. By reducing the consumption of ED (because under the specified conditions little if any CH4 is produced) costs are reduced.    (RU2108982-C1)      Sulphur cpds. are removed from water by anaerobic treatment with sulphur and/or sulphate reducing bacteria, with addn. of an electron donor (ED). The consumption of ED is reduced by (a1) keeping sulphate concn. in the anaerobic effluent at least 0.5 g/l; (a2) keeping sulphite concn. in this effluent at least 0.1g/l; (b) keeping salt concn. (expressed as Na ion equiv.) in the reactor medium at least 6g/l under mesophilic conditions or at least 3g/l under thermophilic conditions; (c) keeping sulphide concn. in the effluent at least 0.1g/l and/or (d) adding to the medium an inhibitor (A) which is more toxic to CH4-producing bacteria than to incompletely oxidising sulphate-reducing bacteria or sulphate-reducing bacteria which oxidise one C cpds. Pref. the biofilm thickness of anaerobic bacteria is below 0.5mm, esp. maintained by strongly turbulent conditions.    USE/ADVANTAGE -   The method is esp. used to regenerate wash liquor used to scrub S-contg. flue gases, but can also be applied to groundwater, mining effluents, industrial waste water, etc. By reducing the consumption of ED (because under the specified conditions little if any CH4 is produced) costs are reduced.    (EP642472-B1)      Sulphur cpds. are removed from water by anaerobic treatment with sulphur and/or sulphate reducing bacteria, with addn. of an electron donor (ED). The consumption of ED is reduced by (a1) keeping sulphate concn. in the anaerobic effluent at least 0.5 g/l; (a2) keeping sulphite concn. in this effluent at least 0.1g/l; (b) keeping salt concn. (expressed as Na ion equiv.) in the reactor medium at least 6g/l under mesophilic conditions or at least 3g/l under thermophilic conditions; (c) keeping sulphide concn. in the effluent at least 0.1g/l and/or (d) adding to the medium an inhibitor (A) which is more toxic to CH4-producing bacteria than to incompletely oxidising sulphate-reducing bacteria or sulphate-reducing bacteria which oxidise one C cpds. Pref. the biofilm thickness of anaerobic bacteria is below 0.5mm, esp. maintained by strongly turbulent conditions.    USE/ADVANTAGE -   The method is esp. used to regenerate wash liquor used to scrub S-contg. flue gases, but can also be applied to groundwater, mining effluents, industrial waste water, etc. By reducing the consumption of ED (because under the specified conditions little if any CH4 is produced) costs are reduced.