Constructed wetlands for treatment of harvest effluents from grow-out ponds of the Amazon river prawn

Autor(es)

Oliveira Santos, Alexandre Augusto ^{[1, 2]} ; Monteiro Camargo, Antonio Fernando ^{[1, 2]}

Afiliação do(s) autor(es)

^[1] CAUNESP UNESP, Aquaculture Ctr, BR-14884900 Jaboticabal, SP - Brazil

^[2] UNESP, Inst Biosci, Dept Ecol, Rio Claro - Brazil

• Tipo de documento: Artigo Científico
• Fonte: AQUACULTURE RESEARCH; v. 46, n. 11, p. 2676-2684, NOV 2015.
• Citações Web of Science: 2

Resumo

Effluent discharges from aquaculture can reduce water quality in receiving water bodies and that strategies or practices to reduce this are necessary. One possibility is to reduce, or eliminate, water renewal in grow-out ponds. In this study, we eliminated water renewal in grow-out ponds associated with the culture of 40 individualsm(-2) of Amazon river prawn (Macrobrachium amazonicum). At the end of the culture period it was, however, necessary to drain the pond to harvest the prawns. An experiment was performed in triplicate, in which the water supply characteristics and harvest water characteristics of ponds were evaluated. To reduce these concentrations of total N and P, an aquatic macrophyte (Eichhornia crassipes, water hyacinth) treatment system (CWs) was adopted. The water characteristics in the CWs were evaluated after 1, 3, 7, 14 and 21days. The water supply of ponds presented the average concentrations of 0.67 +/- 0.32mgL(-1) and 17.4 +/- 14.7gL(-1) of total-N and total-P respectively. The harvest effluent of ponds had elevated concentrations of different forms of nitrogen (4.44mgL(-1) of total-N) and phosphorous (100.9gL(-1) of total-P). After 1day of the experiment we found the following reductions in key nutrients in treatment system containing E. crassipes: 90%, 78% and 45% reductions in the concentrations of particulate matter, orthophosphates and nitrates respectively. We noted that after 3days the nitrates had been reduced by 53%. We concluded that 3days of this treatment was sufficient for the removal of the additional nutrients that had accumulated in the Amazon river prawn ponds. (AU)

• Processo FAPESP: 09/07894-1 - Características limnológicas de viveiros de Camarão-da-Amazônia (Macrobrachium amazonicum), uso e destino do Aguapé (Eichhornia crassipes) como alternativa de tratamento do efluente
• Beneficiário: Alexandre Augusto Oliveira Santos
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto