Resource recovery from co-digestion of organic waste with surplus activated sludge via the carboxylate platform

摘要: Waste activated sludge (WAS) is an important residue generated from Wastewater Treatment Plants (WWTPs) with a high amount of organic and inorganic resources. In view this, WAS management systems have changed towards improving the use waste biomass as feedstock for bioenergy generation nutrient recovery reuse. This study assessed potential using main high-value chemicals like volatile fatty acids (VFAs), via carboxylate platform. order to achieve that, series experiments were conducted aim identify process variables controlling VFA production in batch semi-continuous stirred tank reactors (CSTRs). In first stage, acidogenic fermentations run 21 days iodoform inhibitor methanogenic bacteria, reaching VFAs yields 0.238 g TVFAs/g TVSWAS (CHI3) ratio 6 mg CHI3/g VSS Organic Loading Rate (OLR) 5 TVSWAS/L. The second stage comprised fermentation pressure thermal hydrolysis (HPTH)-WAS under different pH conditions (4-1) results 0.415 VFAs/g TVS at 9.0 C/N=8.77, which emphasize strong effect that has on speciation and, inhibition methane (CH4) generation. In improve HPTH-WAS, co-fermentations thermally pre-treated food algal (Chlorella vulgaris). Optimum reported yield 0.496 C/N=12.72 blend 25% HPTH-WAS/75% HPTH-Food HPTH-Chlorella vulgaris 0.378 TVS, C/N=5.08. This suggests HPTH pre-treatment co-fermentation had positive final despite C/N used. Finally, semi-CSTR fed HPTH-WAS 0.539, 0.328 0.364 fermentors OLRs 0.3, 0.6 1.0 WAS/L·d, respectively. increments OLR null production. Fermentations working 0.3 WAS/L·d presented overall stoichiometrically exceeds 31% produced AD ran this project. The acetic acid was present concentrations above 80% carboxylic content all CSTR experiments. These confirm opportunities part development biorefinery concept existing WWTPs.