*n.d. not determined. All references are cited in the main text. Graja et al. (2005) Secondary sludge from a WWTP, previously thickened. 175ºC for 40 min (not clear if pre-heating time included). Parameter Feed TH TSS (g/L) TCOD (g/L) SCOD (g/L) N (g/L) Soluble N (g/L) NH4-N (g/L) TP (g/L) PO4-P (g/L) VFA (g/L) 83 92 6.9 3.7 0.60 0.14 3.70 0.12 n.d.* 70 89 17 3.5 1.6 0.35 2.9 0.17 1.496 Bougrier et al. (2007) Flotation-thickened secondary sludge from the municipal WWTP of Toulouse ( France) with 17.7 g/L of TCOD, 5.6 g/L of SCOD, 14.9 g/L of TS and 11.7 g/L of TSS. Samples of 0.5 L in a 1 L autoclave at 135ºC for 30 min and at 190ºC for 15 min (excluding pre-heating times, which were 35 min for reaching the lower temperature and 50 min for reaching the higher). Parameter Feed 135ºC 190ºC TCOD (g/L) SCOD (g/L) TS (g/L) TSS (g/L) TVS (g/L) VSS (g/L) VFA (g/L) (g/L) sCarb (g/L) (g/L) sProt (g/L) 17.7 5.6 14.9 11.7 12.1 9.40 3.65 2.12 0.32 6.1 1.5 17.3 5.9 14 10.2 10.85 8.45 4.20 1.37 0.38 6.3 1.6 16.4 7.6 14.5 8.9 11.3 6.90 3.65 1.45 0.57 6.3 3.3 *n.d. means not determined. All references are cited in the main text.
*n.d. means not determined. All references are cited in the main text. Yang et al. (2010) Waste activated sludge from a WWTP that treated the wastewater from a crude oil refinery by the aeration process. 5 L/h sludge treated at 1 MPa for a retention time of 30 min. WO with air at 100, 200 and 300ºC TH at 200ºC Parameter Feed WO WO 150ºC WO TH 200ºC TCOD (mg/L) SCOD/TCOD BOD/TCOD VFA (mg/L) Acetic acid (mg/L) 0.02 0.05 21 7.00 0.03 0.15 1243 355 0.58 0.33 2531 797 12315 0.90 0.52 3843 1230 17311 0.71 0.31 3756 1211 Strong et al. (2011b) A mixture of belt-pressed waste activated sludge and primary one (2:1) from a WWTP of Rotoura, New Zealand. 200 mL sample in a 600 mL Parr reactor at 20 bar, 300 rpm for 2 h. TH at 140 and 165ºC under an inert atmosphere of N2 WO at 220ºC under O2. Parameter feed TH 140ºC TH WO 220ºC TSS (g/L) VSS (g/L) Carbon (%) Nitrogen (%) pH DOC (mg/g TS) SCOD (mg/g TS) Acetic acid (mg/g TS) Formic acid (mg/g TS) Propionic acid (mg/g TS) Butyric acid (mg/g TS) Methanol (mg/g TS) VFA (mg/g TS) 56.5 47.8 45 5 7.2 50 120 2 0 1 1 0 3 53.2 43.6 47 4 5.4 140 510 7 2 2 0 2 11 45.8 37.5 48 3 5.2 170 580 17 5 4 0 3 26 9.5 3. 14 4 5.5 140 400 146 17 5 6 4 174 et Parameter feed TH WO 2-stage
described in Table S2. O2/TCOD from 0 to 2. Propionic acid (mg/L) n.d.* 660 593 340 270 148 n.d.* 591 865 480 295 127 Other VFA(mg/L) n.d.* 660 678 340 100 42 n.d.* 1181 1181 420 169 42 All the concentrations expressed as mg/L COD Qian et al. (2015) Sewage sludge from the WWTP of Beishiqiao in Shaanxi, with 87% wt moisture and 128 g/L TCOD Batch reactor at 450 or 550ºC and 25 MPa for 20 min Oxidation with H2O2 (30 wt%) O2/TCOD of 0, 0.5 and 4.0 Parameter feed 450ºC O2/TCOD=0.0 450ºC O2/TCOD=0.5 550ºC Acids, hydrocarbons and esters (%) Amides (%) Phenol, cresols and aromatic (%) Pyridine, pyrazine and related (%) Cyclic ketonic compounds (%) Total average relative molecular weight TOC (mg/L) NH4-N (mg/L) Percentage of remaining TS (%) 55.035 6.378 24.979 5.144 8.465 299.158 n.d.* n.d.* 100.00 0.879 7.529 40.75 39.546 11.293 158.710 8912 6842 47.56 0.0 8.335 41.076 43.293 7.294 104.599 7298 7105 44.92 0.0 0.0 64.314 35.688 0.0 100.654 2736 3526 28.36 *n.d. means not determined. All references are cited in the main text.