|Titolo||Methane production from process water of sewage sludge hydrothermal carbonization. A review. Valorising sludge through hydrothermal carbonization|
|Tipo di pubblicazione||Articolo su Rivista peer-reviewed|
|Anno di Pubblicazione||2019|
|Autori||Merzari, F., Langone M., Andreottola G., and Fiori L.|
|Rivista||Critical Reviews in Environmental Science and Technology|
|Parole chiave||acclimatization, activated sludge, alkalinity, Ammonia, Anaerobic digestion, article, Biogas, Biogas production, buffer, Carbonization, Dewatering, energy consumption, Energy utilization, heavy metal, hydrothermal alteration, Hydrothermal carbonization, Inoculation, macronutrient, Main parameters, methane, Methane production, methanogenesis, Moisture, Nutrients concentrations, organic compound, organic pollutant, pH, Process temperature, sewage, Sewage sludge, Sewage Treatment, sludge, Sludge digestion, Sludge minimizations, sludge treatment, systematic review, Temperature, Thermochemistry, toxic substance, trace element, waste water management, Wastewater treatment, Water|
Hydrothermal carbonization (HTC) has recently emerged as a promising technology for sustainable sludge minimization and solid products valorization. Nevertheless, a not negligible amount of process water remains as by-product, containing organic compounds which solubilize during the process (10–63 g COD L−1). Its valorization through anaerobic digestion (AD) has been assessed, but no systematic review has been reported to date. The main parameters, which influence the valorization of HTC process water through AD, are initial feedstocks characteristics, nutrients concentration, HTC process temperature and residence time, inoculum acclimation to toxic compounds and its buffer capacity. Experiences reported in the literature proved that HTC applied to sewage sludge at 180–200 °C at residence times in the range 60–90 min could be a good compromise between hydrochar production and valorization, hydrochar dewaterability, biogas production from AD of process water and energy consumption. © 2019, © 2019 Taylor & Francis Group, LLC.
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