es9b03269_si_001.pdf (1.13 MB)
Energy and Nutrient Recovery from Sewage Sludge and Manure via Anaerobic Digestion with Hydrothermal Pretreatment
journal contribution
posted on 2019-12-16, 05:31 authored by Ci Fang, Rixiang Huang, Christy M. Dykstra, Rongfeng Jiang, Spyros G. Pavlostathis, Yuanzhi TangGlobal expectation for sustainability has prompted the
transition
of practices in wastewater treatment plants toward not only waste
management but also energy and nutrient recovery. It has been shown
that low-temperature hydrotherm (HT) treatment can enhance downstream
biogas production via anaerobic digestion (AD). Yet, because the application
of combined HT and AD is still at an early stage, a systematic understanding
of the dynamic speciation evolution of important elements is still
lacking. This study investigates energy and nutrient recovery from
sewage sludge and swine manure via combined HT-AD treatment. Bench-scale
investigation was conducted to evaluate biogas production and understand
the dynamic evolution of organic carbon (C) and phosphorus
(P) speciation. C and P speciations were characterized using complementary
chemical and spectroscopic techniques, including 13C nuclear
magnetic resonance (NMR) spectroscopy, P X-ray absorption near edge
structure (XANES) spectroscopy, and sequential chemical extraction.
Results from this study suggest that low-temperature HT pretreatment
can achieve enhanced biogas production for sludge compared to the
minimal effect on the biogas production from manure. It also provides
guidance for P recovery from liquid digestate and solid residue after
the AD process.