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A hybrid membrane process for simultaneous sludge thickening and digestion (MSTD) was studied. During one cycle (15 d) of operation under a hydraulic retention time of 1 d, the concentration of mixed liquor suspended solids (MLSS) continuously increased from about 4 g·L−1 to 34 g·L−1, and the mixed liquor volatile suspended solids (MLVSS) increased from about 3 g·L−1 to over 22 g·L−1. About 42% of...
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