ABSTRACT
The aim of this study was to determine variations in concentration of Pathogen Indicator Organisms (PIOs) namely total coliforms Escherichia coli and heterotrophic bacteria; Biochemical Oxygen Demand (BOD) in Egerton University Wastewater Stabilisation Ponds (WSPs) and the effect of substrate sizes on wastewater treatment. Sampling at the WSPs was done on weekly basis for one month from mid-Nov to mid-Dec 2017 using standard procedures for examination of water and wastewater. A mesocosm study imitating a vertical sub surface flow constructed wetland was conducted to determine the most efficient substrate size in removal of these pollutant indicators. Total coliforms (TC) and E. coli were isolated using selective and differential media following membrane filtration method Colonies were enumerated on chromocult agar. Heterotrophic bacteria (HPCs) were enumerated using standard pour plate method on plate count agar. Biochemical Oxygen Demand was determined by incubating samples in a cabinet whose room temperature ranged between 20 °C to 25 °C for 5 days. For the mesocosm study, three sets of experiments with different gravel aggregate sizes were set up in triplicates. Wastewater from SMP was introduced and settled for six weeks to enable micro-organisms to establish and stabilize, before collection of water samples for analysis on weekly basis for eight weeks. The highest concentration of both PIOs and BOD was in the inlet, and this reduced along the pathway towards the outlet. Apart from BOD5, there was a significant difference between the influent and effluent in all the parameters (p
, L & Khasisi, D (2021). Characterization Of Egerton University Wastewater Stabilization Ponds And Assessment Of Substrate Size Efficiency In Reduction Of Faecal Pollutants In A Constructed Wetland Mesocosm. Afribary. Retrieved from https://track.afribary.com/works/characterization-of-egerton-university-wastewater-stabilization-ponds-and-assessment-of-substrate-size-efficiency-in-reduction-of-faecal-pollutants-in-a-constructed-wetland-mesocosm
, Lukhabi and Dorothy Khasisi "Characterization Of Egerton University Wastewater Stabilization Ponds And Assessment Of Substrate Size Efficiency In Reduction Of Faecal Pollutants In A Constructed Wetland Mesocosm" Afribary. Afribary, 11 May. 2021, https://track.afribary.com/works/characterization-of-egerton-university-wastewater-stabilization-ponds-and-assessment-of-substrate-size-efficiency-in-reduction-of-faecal-pollutants-in-a-constructed-wetland-mesocosm. Accessed 02 Oct. 2024.
, Lukhabi, Dorothy Khasisi . "Characterization Of Egerton University Wastewater Stabilization Ponds And Assessment Of Substrate Size Efficiency In Reduction Of Faecal Pollutants In A Constructed Wetland Mesocosm". Afribary, Afribary, 11 May. 2021. Web. 02 Oct. 2024. < https://track.afribary.com/works/characterization-of-egerton-university-wastewater-stabilization-ponds-and-assessment-of-substrate-size-efficiency-in-reduction-of-faecal-pollutants-in-a-constructed-wetland-mesocosm >.
, Lukhabi and Khasisi, Dorothy . "Characterization Of Egerton University Wastewater Stabilization Ponds And Assessment Of Substrate Size Efficiency In Reduction Of Faecal Pollutants In A Constructed Wetland Mesocosm" Afribary (2021). Accessed October 02, 2024. https://track.afribary.com/works/characterization-of-egerton-university-wastewater-stabilization-ponds-and-assessment-of-substrate-size-efficiency-in-reduction-of-faecal-pollutants-in-a-constructed-wetland-mesocosm