Influence of ferrous sulfate on thermochemical sludge disintegration and on performances of wastewater treatment in a new process: Anoxic–oxic membrane bioreactor coupled with sludge disintegration step

摘要: Abstract A new wastewater treatment process combining an anoxic–oxic membrane bioreactor (AO-MBR) with thermochemical sludge disintegration step was developed and tested in laboratory scale experiments. The study performed on two AO-MBR systems, namely a P-MBR (practical system) C-MBR (control system), run parallel continuously fed real domestic wastewater. In Run 1, the P-MBR, part of mixed liquid (1.5% influent flow rate) disintegrated thermochemically (at 80 °C, pH 11 3 h) sent back to bioreactor. During this period, solubilization efficiency about 20–22%. Sludge production rate less than that 33%. 2, ferrous sulfate (FeSO4·7H2O) added into control total phosphorus effluent 1.0 mg/L. It is interesting period reduced down 17–19% showing only slightly affected by FeSO4·7H2O addition. reduction compared 24%. MLVSS/MLSS ratio from 75% 68%. Regardless addition, TN removal efficiencies were maintained around 62% both systems. conclusion, plays important role rate. Although adding caused rate, water qualities operation not significant during over 9 months.