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One potential strategy could be to convert the organic compounds in APL to methane for energy recovery via anaerobic digestion; however, APL can be a difficult substrate to digest since it contains organic compounds that are known to inhibit methanogens and methane production. (1990) described anaerobic digestion of pyroligneous acid from pyrolysis of wood mixed with swine slurry. doi: 10.1016/j.biortech.20 Pub Med Abstract | Cross Ref Full Text | Google Scholar Zhang, S., Yan, Y., Li, T., and Ren, Z. Upgrading of liquid fuel from the pyrolysis of biomass. The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice.
In this techno-economic analysis, we have shown that hydrothermal liquefaction (HTL) technology can be integrated with existing biosolids management facilities that utilize anaerobic digestion and biogas capture.
The overall process converts raw sewage sludge to refinery-ready biocrude oil.
Pyrolysis is one thermochemical technology that converts wastewater solids to biochar, pyrolysis gas (py-gas), and pyrolysis liquid.
In pyrolysis, sludges or solids are heated in the absence of oxygen to temperatures 400°C (Mc Namara et al., 2016; Liu et al., 2017, 2018).
Another study concluded that condensate from pyrolysis of dried wastewater biosolids was anaerobically digestible under the specific conditions studied; however, the pyrolysis temperature was low (200°C) and only short-term, batch biochemical methane potential tests were performed with a diluted bio-oil which may not reproduce conditions under continuous feeding (Parry et al., 2012). Characterization of bio-oil from induction-heating pyrolysis of food-processing sewage sludges using chromatographic analysis.
Torri and Fabbri (2014), described inhibition of methanogenic batch tests seeded with unacclimated biomass, using the aqueous phase from corn stalk pyrolysis.
The Hornsby Bend Biosolids Management Plant (HBBMP) in Austin, TX is used as a case study.
First, the operation of the plant without any modification was modeled and validated with field data.
Currently, APL has no apparent use and must be carefully managed due to its high organic strength. doi: 10.1016/j.biortech.20 Pub Med Abstract | Cross Ref Full Text | Google Scholar © 2019 Seyedi, Venkiteshwaran and Zitomer.
The complex composition of APL makes it a challenging wastewater to treat and suitable methods to recover resources or energy from APL are yet to be established. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY).