The Gentleman's Magazine
The Gentleman's Magazine

Author:

Publisher:

Published: 1787

Total Pages: 608

ISBN-13:

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Contains opinions and comment on other currently published newspapers and magazines, a selection of poetry, essays, historical events, voyages, news (foreign and domestic) including news of North America, a register of the month's new publications, a calendar of forthcoming trade fairs, a summary of monthly events, vital statistics (births, deaths, marriages), preferments, commodity prices. Samuel Johnson contributed parliamentary reports as "Debates of the Senate of Magna Lilliputia."

Effect of Operational Variables on Nitrogen Transformations in Duckweed Stabilization Ponds
Effect of Operational Variables on Nitrogen Transformations in Duckweed Stabilization Ponds

Author: Julia Rosa Caicedo Bejarano

Publisher: CRC Press

Published: 2005-03-24

Total Pages: 576

ISBN-13: 9780415377829

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There is an urgent need to develop and improve low cost technologies for wastewater treatment. Simultaneously treating wastewater and producing duckweed in a pond system is, therefore, an attractive solution contributing to both environmental protection and food production. Duckweed has excellent qualities: a high protein content, a high growth rate and is an easy crop to handle. The small plant turns nitrogen from wastewater into a food source. This thesis reports on the effect of different operational variables, like anaerobic pre-treatment, the combination of algae and duckweed ponds and pond depth. Improved nitrogen removal was obtained through the combination of duckweed ponds with algae ponds. Duckweed pond systems could be designed with shallow depth without affecting nitrogen removal efficiency. This research is the result of the cooperative effort between the EIDENAR, Univalle, Cali, Colombia and the UNESCO-IHE Institute for Water Education in Delft, the Netherlands.