Impact on gas potential of primary sludge hydrolysis for internal carbon source production

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding


Abstract in Undetermined
To operate biological nutrient removal processes efficiently, access to easily degradablecarbon is crucial. Internal production of good-quality carbon via hydrolysis of primary sludge has been proven to be a cost-effective way of securing the supply. This study confirms that a highquality
carbon source can be produced by biological hydrolysis of preprecipitated primary sludge from Klagshamn wastewater treatment plant (WWTP). The possible yields of VFAs and soluble COD were determined and compared to a corresponding study performed one year earlier, also at Klagshamn WWTP. Considering the whole carbon and energy balance of a WWTP, the overall
profit of sludge hydrolysis has however been questioned, especially where sludge is utilised for anaerobic digestion and methane production. In this study it was shown in laboratory experiments that primary sludge hydrolysis and withdrawal of the solubilised carbon source did not result in
significantly lower methane production when the remaining sludge was digested compared to when the primary sludge was digested in its original condition. These results clearly contradict the common conception of that sludge hydrolysis for production of carbon source to facilitate nutrient
removal must lead to decreased gas production in the anaerobic digestion at WWTPs.


Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Chemical Engineering


  • Gas potential, hydrolysis, internal carbon source, methane, preprecipitated primary sludge, VFA
Original languageEnglish
Title of host publication[Host publication title missing]
Number of pages8
ISBN (Print)9781843395775
Publication statusPublished - 2009
Publication categoryResearch
Event2nd IWA Specialized Conference Nutrient Management In Wastewater Treatment Processes - Krakow, Poland
Duration: 2009 Sep 6 → …


Conference2nd IWA Specialized Conference Nutrient Management In Wastewater Treatment Processes
Period2009/09/06 → …