Comparative performance studies of water lettuce, duckweed, and algal-based stabilization ponds using low-strength sewage

Journal of Toxicology and Environmental Health. Part a
E AwuahH J Gijzen

Abstract

A bench-scale continuous-flow wastewater treatment system comprising three parallel lines using duckweed (Spirodela polyrhiza), water lettuce (Pistia stratiotes), and algae (natural colonization) as treatment agents was set up to determine environmental conditions, fecal coliform profiles and general treatment performance. Each line consisted of four ponds connected in series fed by diluted sewage. Influent and effluent parameters measured included environmental conditions, turbidity, biochemical oxygen demand (BOD), chemical oxygen demand (COD), nitrate, nitrite, ammonia, total phosphorus, fecal coliforms, mosquito larvae, and sludge accumulations. Environmental conditions and fecal coliforms profiles were determined in the sediments (0.63 m), suspensions (0.35 m), and surfaces (0.1 m) of each pond. Acidic conditions were observed in the pistia ponds, neutral conditions in duckweed ponds, and alkaline conditions in algal ponds. Fecal coliforms log removals of 6, 4, and 3 were observed in algal, duckweed, and pistia ponds, respectively, in the final effluents, with die-off rates per pond of 2.7, 2.0, and 1.6. Sedimentation accounted for over 99% fecal coliform removal in most of the algal and pistia ponds. BOD removal was highe...Continue Reading

Citations

Aug 1, 2014·Journal of Environmental Sciences (China)·Ping HanBee-Lian Ong
Sep 12, 2006·Chemosphere·Thomas Böttcher, Reiner Schroll
Sep 6, 2014·International Journal of Phytoremediation·Bidisha MukherjeeDebashish Chaterjee
Mar 30, 2018·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Jian-Zhen ZhouXue Han
Apr 6, 2020·Environmental Science and Pollution Research International·Dharman KalaimuruganSrinivasan Venkatesan
Apr 1, 2021·International Journal of Phytoremediation·Adedeji A AdelodunUsman O Hassan

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