Eichhornia crassipes-based tertiary treatment of Kraft pulp mill effluents in Chilean Central Region |
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Authors: | Dellarossa Victor Céspedes Jaime Zaror Claudio |
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Institution: | (1) Facultad de Ciencias Naturales y Oceanográficas, Depto Botánica, Casilla 160-C, Concepcion, Chile;(2) Depto. Ing. Química, U. De Concepción, PO Box 160-C, Concepción, Chile |
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Abstract: | This paper presents experimental results on the implementation of Eichhornia crassipes–based tertiary lagoon to treat effluents generated by a 300 ton d–1 Kraft pulp mill in Chile. Results show that E. crassipes rapidly adapted to the tertiary lagoon conditions. Active growth was maintained even during a cold winter, protected by the wastewater heat content. A 1000 m2 seeding area extended to 2300–6200 m2 after a month of growth, with a monthly harvested biomass and nitrogen uptake were 1.1–5.4 ton (dry wt.), and 18–127 kg N, respectively. E. crassipes growth was adequately described by a first order model, with an estimated rate constant ca. 0.03 d–1 and 0.06 d–1, for winter and summer seasons, respectively. A management strategy based on such model, to account for seasonal variations in growth rate while keeping a constant nitrogen uptake capacity, is proposed here. |
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Keywords: | Eichhornia crassipes cellulose mill wastewater tertiary lagoon nitrogen removal |
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