Abstract
In this study, two lab-scale aerobic granular sludge (AGS) systems, seeded with intertidal wetland sediment (IWS) and activated sludge (AS), were constructed to compare their treatment performances and alginate-like exopolymers (ALE) recovery potential in high salinity wastewater treatment. Both reactors (RIWS and RAS) exhibited excellent total organic carbon (TOC) reduction rates > 95.0 %, while RIWS exhibited an improved total nitrogen (TN) removal than RAS (84.4 % vs 75.7 %). The presence of several inorganic particulates (acted as nucleus) in IWS accelerated the formation of granules in RIWS. The ALE yield of RIWS reached 466.6 ± 52.2 mg/g VSS, which was 1.6 times higher than that of RAS (286.2 ± 5.2 mg/g VSS). Moreover, to illustrate the different ALE recovery potentials, the proposed ALE biosynthesis pathway was also assessed. It was observed that the abundance of function genes encoding ALE biosynthesis of RIWS was significantly higher than that of RAS, revealing its superior ALE recovery potential. This study proposed a novel and effective treatment method for high-salinity wastewater with high potential resource recovery.
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