Application of flat-sheet membrane to thickening and digestion of waste activated sludge (WAS)

A hybrid membrane process for simultaneous thickening and digestion of waste activated sludge

“…The higher digestion efficiency achieved in the MSTD process is attributed to the fact that in this process the influent undigested sludge was continuously fed into the reactor and blended with the previously digested sludge existing in the reactor to continue the digestion process. The results are generally in agreement with the report that the destruction efficiency of MLSS and MLVSS in aerobic digestion can be enhanced by the addition of digested sludge into the digester filled with undigested WAS [18,19]. The MSTD process could naturally utilize the mechanisms and thus, the digestion efficiency was higher compared to the conventional aerobic digestion process.…”

Identification of sustainable flux in the process of using flat-sheet membrane for simultaneous thickening and digestion of waste activated sludge

“…In our previous studies, it has been demonstrated that the flatsheet membrane for sludge thickening and digestion is feasible [17]. In the MSTD process, about 70% mixed liquor volatile suspended solids (MLVSS) destruction efficiency was achieved, and the MLSS concentration was increased to more than 30 g/L after 15 days operation.…”

Membrane fouling mechanisms in the process of using flat-sheet membrane for simultaneous thickening and digestion of activated sludge

“…A water-level sensor was used for maintaining a constant water level in the reactor over the experimental period. The operation of the MSTD process has been reported in our previous studies [18,19]. When the MLSS concentrations in the reactor reached approximately 30 g/L, the thickened sludge was drained out while the influent activated sludge and the permeate flow were stopped.…”