Anaerobic Digestion Process Optimization

The pH and temperature were monitored monthly using a pH meter (Sartorius PB-10) and a thermometer separately. The different organic loading rates (OLRs) were achieved by various chemical oxygen demand (COD) concentrations at a fixed hydraulic retention time (HRT). The COD, total suspended solids (TSS), and volatile suspended solids (VSS) were measured according to standard methods (Rice et al., 2012 ). Biogas production was monthly monitored and the CH₄ percentage was determined by Gas Chromatography (SRI 8610 C). The ammonium nitrogen and total nitrogen concentration were determined by the SmartChem Discrete Auto Analyzer (Smartchem200, AMS-Westco, Italy) and Shimadzu TOC Analyzer (TOC-Vcsh; Shimadzu), respectively.

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Zhang K., Zhang Y., Deng M., Wang P., Yue X., Wang P, & Li W. (2023). Monthly dynamics of microbial communities and variation of nitrogen-cycling genes in an industrial-scale expanded granular sludge bed reactor. Frontiers in Microbiology, 14, 1125709.

Publication 2023

PB-10

Ammonium Biogas Chemical oxygen demand Gas chromatography Nitrogen Retention Rice Thermometer

Corresponding Organization : Sun Yat-sen University

Other organizations : Guangdong Industry Technical College, China National Electric Apparatus Research Institute (China)

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Variable analysis

independent variables

Organic Loading Rate (OLR)
Chemical Oxygen Demand (COD) concentration

dependent variables

Temperature
Chemical Oxygen Demand (COD)
Total Suspended Solids (TSS)
Volatile Suspended Solids (VSS)
Biogas production
Methane (CH4) percentage
Ammonium nitrogen concentration
Total nitrogen concentration

control variables

Hydraulic Retention Time (HRT)

controls

No specific positive or negative controls were mentioned in the input.

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