Performance and Bacterial Characteristics of Aerobic Granular Sludge in Treatment of Ultra-Hypersaline Mustard Tuber Wastewater

Mustard tuber wastewater (MTW) is an ultra-hypersaline high-strength acid organic wastewater. Aerobic granular sludge (AGS) has been demonstrated to have high tolerance loading rate (OLR), salinity, and broad pH ranges. However, most studies were conducted under single stress, the performance of AGS multiple stresses (high OLR, low pH) was still unclear. Herein, mature used try treat real MTW at 9% 4.1–6.7, OLR 1.8–7.2 kg COD/m3·d. The increased, results showed that upper boundary 5.4 COD/m3·d (pH 4.2) with relatively compact structure removal TOC (~93.1%), NH4+-N (~88.2%), TP (~50.6%). Under 7.2 4.1), fragmented, primarily due stresses. 16S rRNA sequencing indicated Halomonas dominated reactor during whole process presence unclassified-f-Flavobacteriaceae, Aequorivita, Paracoccus, Bradymonas, Cryomorpha, which played key roles in TOC, nitrogen, phosphorus. This study investigated stresses, also brought a new route for highly-efficient simultaneous nitrification–denitrifying phosphorus MTW.