| Title: | Pilot-scale hydrolysis of primary sludge for production of easily degradable carbon to treat biological wastewater or produce biogas |
| Author(s): | Christensen ML; Jakobsen AH; Hansen CSK; Skovbjerg M; Andersen RBM; Jensen MD; Sundmark K; |
| Address: | "Department of Chemistry and Bioscience, Center for Membrane Technology, Aalborg University, Aalborg, Denmark. Electronic address: mlc@bio.aau.dk. Department of Chemistry and Bioscience, Center for Membrane Technology, Aalborg University, Aalborg, Denmark. Kruger A/S, Aarhus, Denmark" |
| DOI: | 10.1016/j.scitotenv.2022.157532 |
| ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
| Abstract: | "Organic compounds in wastewater are required for the biological removal of nitrogen, but they can also be used for biogas production. Distribution of the internal organic carbon at the plant is therefore critical to ensure high quality of the treated water, reduce greenhouse gas emissions, and optimize biogas production. We describe a wastewater treatment plant designed to focus equally on energy production, water quality, and reduced emissions of greenhouse gases. A disk filter was installed to remove as much carbon as possible during primary treatment. Primary sludge was then hydrolyzed and centrifuged. The hydrolysate centrate contained volatile fatty acids and was used either for the secondary wastewater treatment or to produce biogas. The yield during hydrolysis was 30-35 g volatile fatty acid per kg dry material or 40-65 g soluble COD per kg total solid. The specific denitrification rate was 20-40 g/(g.min), which is on the same order of magnitude as that for commonly used external carbon sources. Hydrolysis at around 35 degrees C and pH 7 gave the best results. The hydrolysate centrate can be stored and added to the biological treatment to improve water quality and reduce emissions of nitrous oxide or it can be used to produce biogas to optimize the operation of the plant" |
| Keywords: | "Biofuels Bioreactors Carbon Fatty Acids, Volatile *Greenhouse Gases Hydrolysis Methane/analysis *Sewage/chemistry Waste Disposal, Fluid/methods Wastewater Denitrification Greenhouse gases Methane Nitrous oxide Separation;" |
| Notes: | "MedlineChristensen, Morten Lykkegaard Jakobsen, Anne Hojmark Hansen, Cecilie Sofie Kragelund Skovbjerg, Mads Andersen, Rikke Bruun Munk Jensen, Mette Dam Sundmark, Kim eng Netherlands 2022/07/26 Sci Total Environ. 2022 Nov 10; 846:157532. doi: 10.1016/j.scitotenv.2022.157532. Epub 2022 Jul 22" |
