Bioenergy production data from anaerobic digestion of thermally hydrolyzed organic fraction of municipal solid waste

The presented dataset in this data article provides quantitative data on the production of bioenergy (biogas and biomethane) from mesophilic batch anaerobic digestion (AD) of thermally hydrolyzed organic fraction of municipal solid waste (OFMSW). The discussion and interpretation of the data are provided in another publication entitled “Hydrothermal Pretreatment of Source Separated Organics for Enhanced Solubilization and Biomethane Recovery” (Razavi et al., 2019). The data and information presented in the current data article include (1) the ratio of soluble to particulate chemical oxygen demand (COD) under different thermal hydrolysis condition, (2) the daily measured biogas and biomethane data, (3) the cumulative methane yield data in terms of mL CH4 produced per gram of volatile suspended solids (VSS) as well as feedstock added, (4) the ultimate methane yield data as well as the relative improvement in methane recovery compared to the control (non-hydrolyzed) digester, (5) the data of first-order organics biodegradation rate constants, (6) the procedure of measuring biogas composition via gas chromatography, (7) the procedure of converting the biogas/methane volume data acquired under the actual experimental condition (mesophilic temperature of 38 °C and atmospheric pressure) to the standard temperature (0 °C) and pressure (1 atm) condition, and (8) the procedure of determining the first-order kinetic rate constants.

& 2019 The Authors. Published by Elsevier Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

Subject area
Environmental engineering More specific subject area Anaerobic digestion, biological treatment, thermal hydrolysis, waste minimization, bioenergy Type of data Table, figures How data were acquired The gas chromatography was employed to determine the methane content of the produced biogas. A Hach spectrophotometer (model DR3900) was used the analysis the chemical oxygen demand (COD) of the samples calorimetrically. The volume of the produced biogas was measured manually with a Poulten & Graf Fortuna™ air-sealed glass syringe (capacity of 100 m) throughout the biochemical methane potential (BMP) assay. To analyze the soluble COD (SCOD), the samples were centrifuged for 20 min at 10,000 rpm using a Sorvall Legend XT centrifuge (Fisher Scientific, US Value of the data The data explain the procedure for converting the gas volume data obtained under specific experimental conditions (e.g., specific temperature and/or pressure) into the values under a standard condition (e.g. 0°C, 1 atm).
Data standardization provide the opportunity to compare the data acquired under different experimental conditions.
The dataset covering a wide range of thermal hydrolysis conditions might be used as a benchmark to validate the findings of other studies.
The data highlight the importance of selecting the optimum ranges of temperature, pressure, and retention time for thermal hydrolysis of OFMSW prior to the AD process.
The kinetics rate data provide valuable information regarding the rate of the anaerobic digestion thermally hydrolyzed OFMSW.

Data
The ratio of soluble to particulate COD in the raw and thermally hydrolyzed OFMSW samples are compared in Fig. 1. The experimentally measured biogas and biomethane production data throughout the BMP experiment are presented in Tables 1 and 2, respectively. The cumulative biomethane yield in terms of mL CH4/g VSS-added and L CH4/L feedstock-added are illustrated in Figs. 2 and 3, respectively. The ultimate methane yield of the digesters fed with raw and thermally hydrolyzed substrates are compared in Fig. 4. The percentage improvements in the ultimate methane yield of the thermally hydrolyzed digesters in comparison with that of the control digester are shown in Fig. 5. The first-order specific biodegradation rate constants of the BMP digesters are presented in Fig. 6.

Procedure of volume data conversion to the standard temperature & pressure condition
The volume of the produced biogas/methane throughout the BMP assay under the mesophilic temperature of 38°C and atmospheric room pressure was converted to the standard temperature & pressure condition (0°C and 1 atm) using Eq. (1)

Biodegradation kinetics rate calculation
The data regarding the rate of organics (COD, VSS, etc.) biodegradation through the digestion process were defined by the first-order reaction model [2][3][4][5][6][7]. Eq. (2) shows the kinetic reaction model used to calculate the first-order rate constants data for the TCOD degradation of the digesters.
in which r, k, and A t are respectively the organics removal rate (e.g., TCOD degradation rate in mg/L.d), the first-order specific biodegradation rate constant (1/d), and the remaining concentration of organics (e.g., TCOD concentration in mg/L) at time t. By integrating and rearranging Eqs. (2) and (3) will be obtained as follows: in which A u is the ultimate biodegradable organics concentration (mg/L), and the rest of the parameters are as defined before.