https://repositorio.ufsc.br/handle/123456789/130371 Artigos Publicados 2026-09-05T19:50:16Z https://repositorio.ufsc.br/handle/123456789/130378 Using full-scale duckweed ponds as the finish stage for swine waste treatment with a focus on organic matter degradation Belli Filho, Paulo; Costa, Rejane H. R.; Mohedano, Rodrigo A.; Horfmann, S. M. The rapid increase in the number of swine has caused pronounced environmental impacts worldwide, especially on water resources. As an aggregate, smallholdings have an important role in South American pork production, contributing to the net diffusion of pollution. Thus, duckweed ponds have been successfully used for swine waste polishing, mainly for nutrient removal. Few studies have been carried out to assess organic matter degradation in duckweed ponds. Hence, the present study evaluated the efficiency of two full-scale duckweed ponds for organic matter reduction of swine waste on small pig farms. Duckweed ponds, in series, received the effluent after an anaerobic biodigester and storage pond, with a flow rate of 1 m3 day 1. After 1 year of monitoring, an improvement in effluent quality was observed, with a reduction in biochemical oxygen demand (BOD) and total chemical oxygen demand (tCOD), respectively, of 94.8 and 96.7%, operating at a loading rate of approximately 27 kgBOD ha 1 day 1 and 131 kgCOD ha 1 day 1. Algae inhibition due to duckweed coverage was strongly observed in the pond effluent, where chlorophyll a and turbidity remained below 25 μg L 1 and 10 NTU. Using the study conditions described herein, duckweed ponds were shown to be a suitable technology for swine waste treatment, contributing to the environmental sustainability of rural areas. Artigo Publicado em: IWA - Water Science & Technology 2014-03-14T00:00:00Z https://repositorio.ufsc.br/handle/123456789/130377 Nutrient recovery from swine waste and protein biomass production using duckweed ponds (Landoltia punctata): Southern Brazil Belli Filho, Paulo; Costa, Rejane H. R.; Mohedano, Rodrigo A.; Velho, Viviane F.; Horfmann, S. M. Brazil is one of the most important countries in pork production worldwide, ranking third. This activity has an important role in the national economic scenario. However, the fast growth of this activity has caused major environmental impacts, especially in developing countries. The large amount of nitrogen and phosphorus compounds found in pig manure has caused ecological imbalances, with eutrophication of major river basins in the producing regions. Moreover, much of the pig production in developing countries occurs on small farms, and therefore causes diffuse pollution. Therefore, duckweed pond have been successfully used in the swine waste polishing, generating further a biomass with high protein content. The present study evaluated the efficiency of two full scale duckweed ponds for the polishing of a small pig farm effluent, biomass yield and crude protein (CP) content. Duckweed pond series received the effluent from a biodigester-storage pond, with a flow rate of 1 m3/day (chemical oxygen demand rate ¼ 186 kg/ha day) produced by 300 animals. After 1 year a great improvement of effluent quality was observed, with removal of 96% of total Kjeldahl nitrogen (TKN) and 89% of total phosphorus (TP), on average. Nitrogen removal rate is one of the highest ever found (4.4 g TKN/m2 day). Also, the dissolved oxygen rose from 0.0 to 3.0 mg/L. The two ponds produced together over 13 tons of fresh biomass (90.5% moisture), with 35% of CP content, which represents a productivity of 24 tonsCP/ha year. Due to the high rate of nutrient removal, and also the high protein biomass production, duckweed ponds revealed, under the presented conditions, a great potential for the polishing and valorization of swine waste. Nevertheless, this technology should be better exploited to improve the sustainability of small pig farms in order to minimize the impacts of this activity on the environment. Artigo publicado em: IWA - Water Sciencie et Technology 2012-01-25T00:00:00Z https://repositorio.ufsc.br/handle/123456789/130375 High nutrient removal rate from swine wastes and protein biomass production by full-scale duckweed ponds Belli Filho, Paulo; Costa, Rejane H. R.; Mohedano, Rodrigo A.; Tavares, Flávia A. 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/m2day 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/hayear 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. Artigo publicado em: Elsevier - Bioresource Technology 2012-02-16T00:00:00Z https://repositorio.ufsc.br/handle/123456789/130373 Licenciamento Ambiental em Pequenas Propriedades Suinícolas: Um Estudo de Caso no Município de Braço do Norte-SC Mohedano, Rodrigo A.; Belli Filho, Paulo; Vieira, Branda; Nuernberg, July O estado de Santa Catarina é o maior produtor de suínos, contando com um efetivo com cerca de 7,9 milhões de cabeças, representando uma importante atividade econômica para o país. Contudo, essa atividade gera fortes impactos ambientais, principalmente pela grande quantidade de efluentes, que se não tratados de forma adequada podem contaminar os recursos naturais, tanto o solo como os corpos d’água e o ar. Por ser uma atividade potencialmente poluidora, o licenciamento ambiental é previsto em lei e sua fiscalização tem sido crescente. Deste modo, o objetivo deste trabalho é elucidar o processo de licenciamento ambiental em pequenas propriedades rurais onde não é viável a adequação ao código florestal. Para isso utilizou-se um estudo de caso feito a partir do acompanhamento de um Termo de Ajustamento de Conduta (TAC) firmado entre o MP-SC e o suinocultor. Como principais medidas compensatórias e mitigatórias, o TAC propõe um projeto técnico para a adequação das estruturas edificadas, averbação de reserva legal além dos 20% exigido por lei e um plano para recuperação de áreas degradadas (PRAD) nas regiões de APP passiveis de recuperação. Conclui-se que com a implantação das medidas solicitadas haverá uma grande redução do impacto ambiental causado pela propriedade suinícola, contudo o processo de licenciamento exigido é bastante burocrático e oneroso tornando-se distante da realidade dos suinocultores, principalmente para as pequenas propriedades com mão de obra familiar. Artigo Publicado em: VII Simpósio Internacional de Qualidade Ambiental 2015-03-09T00:00:00Z