Skip to main content

Table 1 pH, COD, TOC, and UV245 values of HTLWW samples under different HTL conditions

From: Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Parameters 170 °C–0.5 h 200 °C–0.5 h 230 °C–0.5 h 260 °C–0.5 h 290 °C–0.5 h 320 °C–0.5 h 200 °C–1 h 200 °C–2 h 200 °C–4 h
pH 5.56 ± 0.01 4.09 ± 0.02 3.81 ± 0.21 3.72 ± 0.07 3.69 ± 0.12 3.68 ± 0.07 3.86 ± 0.10 3.80 ± 0.02 3.81 ± 0.09
COD g/L 11.35 ± 1.19 27.58 ± 1.82 22.25 ± 2.05 24.33 ± 1.98 29.02 ± 1.09 24.33 ± 1.19 23.2 ± 1.04 14.28 ± 2.88 19.00 ± 3.29
TOC g/L 3.92 ± 0.03 9.99 ± 1.12 8.55 ± 0.12 8.88 ± 0.50 10.27 ± 1.04 9.23 ± 0.87 9.03 ± 0.32 5.18 ± 0.93 7.29 ± 0.02
Organic in HTLWW %a 12.11 ± 1.27 29.42 ± 3.08 23.74 ± 3.25 25.96 ± 2.11 30.96 ± 4.16 25.96 ± 1.26 24.75 ± 1.10 15.23 ± 3.07 20.27 ± 3.51
UV254/CODb 2.46 ± 1.19 2.57 ± 2.89 3.91 ± 3.05 2.48 ± 1.98 2.24 ± 3.90 1.99 ± 1.19 4.39 ± 1.04 4.63 ± 2.99 3.95 ± 3.29
  1. aThe percentage organics (in COD values) in HTLWW, COD of rice straw input in HTL process was calculated according to C, H, O, and N elemental compositions
  2. bUV254 unit was 1/m