Abstract An upflow anaerobic sludge blanket reactor was employed to treat saline sulfate wastewater.Mesophilic operation (35 ± 0.5 C) was performed with hydraulic retention time fixed at 16 h. When the salinity was 28 g L-1, the chemical oxygen demand and sulfate removal efficiencies were 52 and 67 %,respectively. The salinity effect on sulfate removal was less than that on organics removal. The methane productions were 887 and 329 cm3 L-1 corresponding to the NaCl concentrations of 12 and 28 g L-1,respectively. High salinity could stimulate microbes to
produce more extracellular polymeric substances(EPSs) and granulation could be performed better.Besides, with the high saline surroundings, a great deal of Na? compressed the colloidal electrical doublelayer,neutralized the negative charge of the sludge particles and decreased their electrostatic repulsion.
Abstract An upflow anaerobic sludge blanket reactor was employed to treat saline sulfate wastewater.Mesophilic operation (35 ± 0.5 C) was performed with hydraulic retention time fixed at 16 h. When the salinity was 28 g L-1, the chemical oxygen demand and sulfate removal efficiencies were 52 and 67 %,respectively. The salinity effect on sulfate removal was less than that on organics removal. The methane productions were 887 and 329 cm3 L-1 corresponding to the NaCl concentrations of 12 and 28 g L-1,respectively. High salinity could stimulate microbes toproduce more extracellular polymeric substances(EPSs) and granulation could be performed better.Besides, with the high saline surroundings, a great deal of Na? compressed the colloidal electrical doublelayer,neutralized the negative charge of the sludge particles and decreased their electrostatic repulsion.
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