Capacidade extratora de plantas em sistemas alagados utilizados no tratamento de águas residuárias de laticínios

Abstract

RESUMOObjetivou-se, neste trabalho, avaliar a capacidade extratora de duas espécies vegetais quando cultivadas em sistemas alagados construídos (SAC) utilizados no tratamento de águas residuárias de laticínios (ARL Extraction capacity of plants grown in constructed wetland systems used for treatment of dairy wastewater ABSTRACT The objective of this research was to evaluate the extraction capacity of two plant species when grown in constructed wetland systems (CWS) used for dairy wastewater (DW) treatment. The experimental units were formed by five CWS grown with Pennisetum purpureum schum grass and five CWS cultivated with grass tifton 85 (Cynodon spp.), with horizontal subsurface flow. The DW was applied at an average flow of 60 L d -1 and hydraulic residence time of 4.8 days, and subjected to organic loading rates (ORL) of 66, 130, 190, 320 and 570 kg ha -1 d -1 of BOD. The grass tifton 85 extracted more nitrogen and sodium, while the elephant grass extracted a larger amount of potassium from the DW, when grown under the evaluated organic loading rates (ORL). The concentration of phosphorus in aerial parts of plants and extraction capacity were similar in the two grasses, however, there is evidence of an increase in the extraction this nutrient, by the grass tifton 85, with the increase of the ORL applied in the CWS.

<bold>The efficiency of electrocoagulation using aluminum electrodes</bold>i<bold>n treating wastewater from a dairy industry</bold>

“…The variation in the average values of physical and chemical characteristics of the dairy effluent studied soon after all of the samples were collected was: pH (1.0-5.4), turbity (267-1000NTU), COD (2060-5249mg L-1), total solids (TS) (1965-3723mg L-1), total volatile solids (TVS) (1560-3434mg L-1), total fixed solids (TFS) (405-592mg L-1), total dissolved solids (TDS) (1521-3083mg L-1), volatile dissolved solids (VDS) (1198-2843mg L-1), fixed dissolved solids (FDS) (240-492mg L-1), total suspended solids (TSS) (444-758mg L-1), volatile suspended solids (VSS) (397-658mg L-1), fixed suspended solids (FSS) (47-100mg L-1) and settleable solids (SS) (0.4-0.5mL L-1). These results are corroborated by previously published data (MATOS et al, 2010).…”

“…Among the food industries, the contribution of dairy pollution of water bodies is very significant, since the processing of milk causes considerable pollution load, due to the presence of large amounts of organic matter in wastewater (MATOS et al, 2010).…”

Performance of Tifton 85 Grass Under Fertirrigation With Slaughterhouse Wastewater

“…Matos et al (2010) evaluated plant extractive capacity in constructed flooded systems and found an increase in dry matter productivity of Tifton 85 grass of 14.9 t ha -1 after receiving rates of 570 kg ha -1 d -1 of BOD from dairy wastewater.…”

Avaliação Do Custo De Energia Elétrica E De Material No Tratamento De Efluente De Laticínios Por Eletrocoagulação

“…As amostras do efluente do laticínio apresentaram alta concentração de matéria orgânica, principal-mente a fração que corresponde aos sólidos dissolvidos voláteis, estas características estão de acordo com outros autores (DEMIREL et al, 2005;HAMDANI et al, 2005;MATOS et al, 2010;VALENTE et al, 2012). …”