Publications by authors named "G Gaval"
In a municipal wastewater treatment plant, the thermal treatment of sludge can be an efficient way of increasing the final sludge cake dryness and boosting anaerobic digestion performances. However, such treatments generate refractory compounds which, once returned to headworks, can affect the quality compliance of effluent discharges, particularly concerning organic nitrogen. This study explores the effects of thermal hydrolysis (TH) and hydrothermal carbonization (HTC) of municipal sludge on the refractory organic compound production.
View Article and Find Full Text PDFThis study investigated the influence of dissolved CO on the selection of metabolic pathway using a methanation membrane bioreactor supplied with H/CO. Various ratios of H/CO were applied (3.3, 3.
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- The study focuses on the analysis of dissolved organic matter (DOM) in wastewater treatment, specifically targeting recalcitrant compounds that arise from thermal sludge pretreatment.
- Researchers developed a method using ultra-high-performance liquid chromatography size-exclusion chromatography (U-HPLC SEC) combined with UV and fluorescence detection to differentiate between melanoidins and humic acids (HAs).
- The findings show that low molecular weight fractions indicate melanoidins, while high molecular weight fractions are characteristic of HAs, and specific detection modes yield distinct fluorescence patterns relevant in classifying these organic compounds.
Data in this article provides detailed information on the microbial dynamics and degradation performances in two full-scale anaerobic digesters operated in parallel for 476 days. One of them was kept at 35 °C for the whole experiment, while the other was submitted to sub-mesophilic (25 °C) conditions between days 123 and 373. Sludge samples were collected from both digesters at days 0, 80, 177, 218, 281, 353, and 462.
View Article and Find Full Text PDFFull-scale anaerobic digesters' performance is regulated by modifying their operational conditions, but little is known about how these modifications affect their microbiome. In this work, we monitored two originally mesophilic (35 °C) full-scale anaerobic digesters during 476 days. One digester was submitted to sub-mesophilic (25 °C) conditions between days 123 and 373.
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