scholarly journals Reviewing factors affecting the effectiveness of decentralised domestic wastewater treatment systems for phosphorus and pathogen removal

2017 ◽  
Vol 91 ◽  
pp. 40-47
Author(s):  
Joseph. C. Akunna ◽  
Juliette M. O’Keeffe ◽  
Richard Allan
Keyword(s):  
Wastewater Treatment ◽  
Domestic Wastewater ◽  
Pathogen Removal ◽  
Factors Affecting ◽  
Domestic Wastewater Treatment ◽  
Wastewater Treatment Systems

Environmental conditions and pathogen removal in macrophyte- and algal-based domestic wastewater treatment systems

2001 ◽  
Vol 44 (6) ◽  
pp. 11-18 ◽  
Author(s):  
E. Awuah ◽  
F. Anohene ◽  
K. Asante ◽  
H. Lubberding ◽  
H. Gijzen
Keyword(s):  
Wastewater Treatment ◽  
Environmental Conditions ◽  
Domestic Wastewater ◽  
Pistia Stratiotes ◽  
Water Lettuce ◽  
Pathogen Removal ◽  
Moist Sand ◽  
Tropical Conditions ◽  
Wastewater Treatment Systems ◽  
All Treatment

The environmental conditions and pathogen removal in macrophyte (Pistia stratiotes and Lemna paucicostata) and algal-based wastewater treatment systems were determined over a period of 29 days under tropical conditions. The experiment was conducted on a batch scale in 4.5 plastic containers immersed in moist sand beds. A control of raw sewage stored under dark conditions was included. Environmental conditions such as pH, temperature DO and conductivity and heterotrophic and faecal enterococci populations were monitored five times a week at 8, 12 and 20 GMT. BOD was monitored once a week for five weeks. Average temperatures within the systems ranged between 28.3°C in the control to 30.6°C in the algal-based system. Low pH levels of pH of 4.5 and DO levels of 3 mg/L were recorded in the water lettuce treatment systems. High pH levels around 10.5 and DO levels of about 20 mg/L were observed in the algal-based system. The control and duckweed system remained neutral. All treatment systems performed equally well in pathogen removal and BOD reduction. The BOD decreased from 130mg/L to 5.0, 7.5, 10 and 15 mg/L in the duckweed, water lettuce, control and algal based treatment systems respectively. The faecal enterococci population decreased from 1.18×105 /ml to values below 100/ml in all treatment systems.

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