Organic transformation, lactic acid metabolism, and membrane performance in high-rate methanogenic treatment of dairy processing wastewater using thermophilic high-solid anaerobic membrane bioreactor

Iron Recycle-Driven Organic Capture and Sidestream Anaerobic Membrane Bioreactor for Revolutionizing Bioenergy Generation in Municipal Wastewater Treatment

“…Simultaneously, the sludge yield of the AnMBR increased from 268 ± 31 to 321 ± 18 mg of TS/g of COD under decreased HRT and increased OLR conditions (Figure b). In addition, the treatment efficiency of the converted methane yield at 406–415 mL CH 4 /g volatile solids in this study was higher than that in previous studies on primary sludge treatment at 171–334 mL CH 4 /g volatile solids. , The concentration of mixed-liquor TS in the AnMBR was maintained at a high level of 30–40 g/L, which theoretically provided a longer substrate retention time, longer SRT, and higher microbial concentration compared to general CSTR (15–25 g/L mixed-liquor TS), thus enhancing the substrate degradation efficiency, methane yield, microbial robustness, and system stability. , …”

“…Previous studies on the AD of CEPT sludge have used a traditional continuous stirring-tank reactor (CSTR); however, this method has limitations in terms of treatment efficiency, low sludge degradation efficiency, and long hydraulic retention time (HRT) requirements. , Despite the recent encouragement for the use of AnMBRs to significantly improve bioenergy recovery efficiency, leveraging their ability to achieve a modulated short HRT with a long sludge retention time (SRT), − their application in Fe-PS treatment has not yet been reported. Additionally, in situ membrane separation avoids the use of complex sludge dewatering steps and directly provides a high concentration of iron-rich digested sludge and ammonium-rich permeate for subsequent acidification and anaerobic ammonium oxidation (anammox)-based nitrogen removal processes, respectively.…”