Investigation of algal cultivation and anaerobic co-digestion of sewage sludge and algae at wastewater treatment plant (WWTP)

Meng Wang, Zhiren Zhu, Sona Dolan, Chul Park

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Micractinium and Chlorella, harvested from local WWTP, were cultivated in primary effluent, sludge centrate, and their combination. Continuous light condition (24hr light) and periodic light (16hr light/8hr dark) were provided to investigate the behavior of these two algal species in different growth media. Primary effluent supported better growth of both algal species, and also led to higher soluble nitrogen (84-92%) and phosphorous (59-74%) removal. The specific growth rates in all media were low due to the phosphorous-limited condition. Microalgae posed different growth characteristics in real wastewater and resulted in different amount of extracellular polymeric substances (EPS). High amount of EPS helps algal aggregation. Co-digestion study showed that addition of microalgae did not bring negative effects on anaerobic digestion of sewage sludge. These results indicated that microalgae-based process has potential to decrease nutrient loads along with bioenergy production by coupling algae cultivation into wastewater treatment systems with anaerobic digesters.

Original languageEnglish (US)
Title of host publicationWEFTEC 2012 - 85th Annual Technical Exhibition and Conference
PublisherWater Environment Federation
Pages3586-3599
Number of pages14
ISBN (Electronic)9781510870437
StatePublished - Jan 1 2012
Event85th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2012 - New Orleans, United States
Duration: Sep 29 2012Oct 3 2012

Publication series

NameWEFTEC 2012 - 85th Annual Technical Exhibition and Conference
Volume6

Conference

Conference85th Annual Water Environment Federation Technical Exhibition and Conference, WEFTEC 2012
CountryUnited States
CityNew Orleans
Period9/29/1210/3/12

All Science Journal Classification (ASJC) codes

  • Ecological Modeling
  • Environmental Chemistry
  • Pollution
  • Waste Management and Disposal
  • Water Science and Technology

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  • Cite this

    Wang, M., Zhu, Z., Dolan, S., & Park, C. (2012). Investigation of algal cultivation and anaerobic co-digestion of sewage sludge and algae at wastewater treatment plant (WWTP). In WEFTEC 2012 - 85th Annual Technical Exhibition and Conference (pp. 3586-3599). (WEFTEC 2012 - 85th Annual Technical Exhibition and Conference; Vol. 6). Water Environment Federation.