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Click to access the September 2018 issue of Water Environment Research.

Researchers investigated the unbiodegradable fraction of particulate chemical oxygen demand (PCOD) in thickened waste activated sludge (TWAS). They used semi-continuous completely-mixed anaerobic digesters for the study.

A laboratory-scale system was operated at detention times ranging from 16.7 to 33.3 days with organic loading rates between 1.21 and 3.47 kg/L m³. The article, “Estimation of the Unbiodegradable Fraction of Thickened Waste Activated Sludge,” presents the finding that unbiodegradable fractions of PCOD and volatile suspended solids range between 0.26 and 0.28.

“In their paper on thickened waste activated sludge, Chowdhury et al. used long term anaerobic studies … to determine the fraction of unbiodegradable particulate COD,” said Tim Ellis, WER editor-in-chief. “This study provides additional information for the design and operation of anaerobic digestion processes to achieve volume reduction, pathogen destruction, and energy recovery from waste active sludge.”

Other papers published in this issue include

• “Evaluation of the Influence of Clay Montmorillonite Content on the Aqueous Uptake of Lead and Zinc,”
• “A Comparison of Heterogeneous/Homogeneous Crystallization for Phosphate Recovery from Biosolids,”
• “LED-Based Ultraviolet Oxidation of Pharmaceuticals: Effects of Wavelength and Intensity, pH, and TiO₂ Loading,”
• “Nitrogen Removal and N₂O Emission in Biochar-Sludge Subsurface Wastewater Infiltration Systems,”
• “Photocatalytic Degradation of Methylene Blue Dye Using Silica Oxide Nanoparticles as a Catalyst,”
• “A New Method for Environmental Flow Assessment Based on Basin Geology: Application to the Ebro Basin,”
• “Enhanced Methane Yield by Codigestion of Sewage Sludge with Microalgae and Catering Waste Leachate,”
• “Phosphorus Recovery by Methods Beyond Struvite Precipitation,” and
• “Characterization of Wastewater in Two U.S. Cattle Slaughterhouses.”