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Sulphate Reduction and Zinc Precipitation From Wastewater by Sulphate-Reducing Bacteria in an Anaerobic Moving-Liquid/Static-Bed Bioreactor Publisher



Teiri H1 ; Rezaei M2 ; Nazmara S3 ; Hajizadeh Y1
Authors
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Authors Affiliations
  1. 1. Department of Environmental Health Engineering, Isfahan University of Medical Sciences, Hezar Jerib St., Isfahan, Iran
  2. 2. Department of Environmental Health Engineering, Ardabil University of Medical Sciences, Daneshgah St., Ardabil, Iran
  3. 3. Department of Environmental Health Engineering, Tehran University of Medical Sciences, Keshavarz Boulevard, Tehran, Iran

Source: Desalination and Water Treatment Published:2016


Abstract

Sulphate and zinc removal from a synthetic wastewater by sulphate-reducing bacteria was evaluated using an anaerobic moving-liquid/fixed-bed bioreactor packed with ceramic media. The system was initially augmented by adding sewage sludge as a source of the bacteria. Calcium sulphate dihydrate as a source of sulphate and sodium lactate as a source of carbon were added to the reactor. The system was operated under batch and anoxic conditions with inlet zinc concentrations from 30 to 110 mg/L at different retention times (4–24 h). After adaptation of the system and reaching a steady-state, for a zinc inlet load of 100 mg/L, a maximum removal of 98.7% was attained with a retention time of 24 h. With an optimum inlet sulphate concentration (1,500 mg/L) and with a retention time of 24 h, a maximum sulphate removal efficiency of about 89.2% was achieved. However, these values were declined by decreasing the retention time. The system showed low capacity to COD removal, e.g. at a COD/SO2- 4 loading ratio of 2.26, the effluent COD was eliminated by 35%. The amount of hydrogen sulphide (H2S) produced among the processes, the concentrations of sulphide (S2−) and sulphite (SO2- 3) in the effluent were also measured. © 2016 Balaban Desalination Publications. All rights reserved.