Aerobic granular sludge inoculant for enhancing high salinity wastewater treatment: Performance and value-added biopolymer recovery

초록

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 (R IWS and RAS) AS ) exhibited excellent total organic carbon (TOC) reduction rates > 95.0 %, while R IWS exhibited an improved total nitrogen (TN) removal than R AS (84.4 % vs 75.7 %). The presence of several inorganic particulates (acted as nucleus) in IWS accelerated the formation of granules in R IWS . The ALE yield of R IWS reached 466.6 +/- 52.2 mg/g VSS, which was 1.6 times higher than that of R AS (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 R IWS was significantly higher than that of RAS, AS , 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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