Abstract
The mariculture waste solids generated in mariculture system were harmlessly reused to cultivate salt-tolerant aerobic granular sludge to further treat synthetic mariculture wastewater. Salt-tolerant aerobic granules with small size (~350 µm) were obtained after 45 days in an anaerobic/aerobic/anoxic sequencing batch reactor. The functional microorganisms were efficiently enriched as high nitrogen and phosphate removal efficiencies of 96.1% and 97.2% respectively were obtained after granulation. Loosely bound protein was conducive to form initial granules. EPS barely changed after granulation. The microbial richness and diversity of mariculture waste solids decreased during the granulation process. Dominant microorganisms were different between young granules and matured granules. Many genera which proliferated in young granules were uncompetitive and reduced or eliminated after granulation. Genera of unclassified_f __Rhodobacteraceae, unclassified_f __Flavobacteriaceae and Ilumatobacter related to phosphorus removal process. Denitrification was mainly performed by denitrifying phosphorus accumulating organisms, denitrifying glycogen accumulating organisms and autotrophic denitrifiers after granulation under saline condition.
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