Desempenho de wetlands construídas (banhados construídos) no tratamento de manipueira

AUTOR(ES)
DATA DE PUBLICAÇÃO

2009

RESUMO

The objective of this research was to assess the possibility of applying subsuperficial flow constructed wetlands to lower the pollution load from cassava processing wastewater (cassava wastewater) and to produce Green biomass. The study was performed at lab-scale by using 4 glass units, with fine sand as substrate, where 3 units were cultivated with Tangola grass (hybrid Brachiaria arrecta (Tanner) x Brachiaria mutica (Angola)). The cassava wastewater was applied in different conditions: in Period I (91 days duration time) conditions were a high chemical oxygen demand (COD) of 16 g.L-1 and a pH of 4,29; Period II, the cassava wastewater was previously treated in a anaerobic reactor and presented a slightly basic pH (153 days) and, Period III, the addition of sodium bicarbonate (pH around 6) in diluted cassava wastewater to 6 g.L-1 of COD (31 days) and 16 g.L-1 COD (67 days). In Period I, which was the period with the most adverse conditions (winter time, low rainfall, high organic loading rate and low pH), the constructed wetlands showed considerable removal of COD (42%), suspended solids (92%), turbidity (95%), nitrogen (78%) and phosphorus (97%). The production and quality of the green biomass varied according to climatic conditions and the characteristics of the cassava wastewater as well as the concentration of macro and micronutrients present in the leaves and substrate. The period with the highest production was period III with mean 1,03 g.d-1.

ASSUNTO(S)

cassava processing industry nutrients filtros plantados gramínea tangola nutrientes engenharia sanitaria cultivated filters grass gangola biomassa verde fecularia green biomass

ACESSO AO ARTIGO

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