High nutrient removal rate from swine wastes and protein biomass production by full-scale duckweed ponds

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• 作者：Rodrigo A. Mohedano^a ; ^{rodrigomohedano@gmail.com} ; Rejane H.R. Costa^a ; Flá ; via A. Tavares^b ; Paulo Belli Filho^a
• 关键词：Duckweed pond ; Swine waste ; Biomass production ; Landoltia punctata ; Nutrient recovery
• 刊名：Bioresource Technology
• 出版年：2012
• 期刊代码：11_09608524
• 类别：ce
• 出版时间：May, 2012
• 卷：112
• 期：Complete
• 页码：98-104
• 文件大小：515 K

摘要

Duckweed ponds have been successfully used in swine waste polishing, generating a biomass with high protein content. Therefore, the present study evaluated the efficiency of two full-scale duckweed ponds considering nutrient recovery from a piggery farm effluent (produced by 300 animals), as well as the biomass yield and crude protein (CP) content. A significant improvement in the effluent quality was observed, with the removal of 98.0%of the TKN (Total Kjeldahl Nitrogen) and 98.8%of the TP (Total Phosphorous), on average. The observed nitrogen removal rate is one of the highest reported (4.4 g/m² day of TKN). Additionally, the dissolved oxygen level rose from 0.0 to 3.0 mg/L, on average. The two ponds together produced over 13 tons of biomass (68 t/ha year of dry biomass), with 35%crude protein content. Because of the excellent nutrient removal and protein biomass production, the duckweed ponds revealed a great potential for the polishing and valorisation of swine waste, under the presented conditions.