Modelling Escherichia coli removal during domestic wastewater treatment in outdoor pilot scale High Rate Algal Ponds

• DOI: 10.1007/s10811-023-02947-8
• Publication Date: 2023-03-30T14:07:34Z
• Authors: Paul Chambonniere; Maxence Plouviez; Benoit Guieysse
• Keywords: Sunlight

Abstract While there is growing evidence that High Rate Algal Ponds (HRAPS) can support disinfection during wastewater treatment, the mechanisms of pathogen removal involved remain unclear. Based on previous findings, present study aimed at verifying occurrence and significance dark decay, alkaline-pH toxicity, sunlight direct damage in conditions representative ‘real’ HRAP operation. For this purpose, Escherichia coli cell count was monitored hourly 24 h periods outdoor pilot HRAPs fed domestic wastewater. The data generated used to create 2 distinct sets were then calibrate validate a model E. HRAP. By modelling contribution three considered, could be predicted with mean relative absolute error 5.34% (N = 46). inputted yearly environmental obtained from continuous operations scale evaluate yearlong contributions each mechanism overall removal. Dark decay thus highest (78.6 – 91.0% total 95% confidence level) followed by mediated (6.01 17.8%) pH toxicity (0.22 6.2%). Significant seasonal daily fluctuations evidenced study.