Dinamica da remoção de nutrientes em alagados construidos comTypha sp

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

The study of the use of wetlands it supplies the possibility of treatments of residues of a natural and efficient form, promoting one better exploitation of the environment resources. The project that used the system of wetlands developed in the experimental field of the College of Agriculture Engineering (FEAGRI) had as objective to evaluate the degree of foliar development of the plant of the specie Typha sp., with the aid of ecofisiologics parameters (transpiration, conductance), active radiation (RFA) and of the climatic data-collecting: temperature of air and relative humidity; that they supply the deficit of saturated vapor pressure (DPVS). The gotten data had been related with the withdrawal of nutrients: match, nitrate and ammonia; beyond pH and present electric condutivity in the deriving residuary water of the sewer of the FEAGRI of the campus of the State University of Campinas - UNICAMP, located in the city of Campinas ? SP (Brazil). Allowing an evaluation of the relation of the ecofisiologic data of the plant with the withdrawal of nutrients, as well as the study of the moment of maximum removal of composites contained in the liquid residue and verifying the relation of them with the foliar transpiration rate. The referring measures of field to the ecofisiologics parameters had been collected in the months of May, July and October of 2002, being later analyzed in the laboratory of analyze chemistries of the College of Engineering of Food (FEA). The concentrations of entrance nutrients and exit of the effluent one of the residuary water had been removed to the end of each measure of field in the wetland of called dimensions 2x2 (m) and 4x1(m) for effect of study of wetlands 1 and 2. During the study, the volumetric outflow inside of the system also measured, with readings in the entrance and exit of the station. The care was overcome to effect it self measured hours in the interval of the 8 to the 20 hours with collection of samples of entrance and exit of two wetlands. The collections had totalized four samples for the moment, in a total of 780 samples for the fifteen days of measures, divided in three respective months: May, July and October. The average transpiration of typha in day 18/07/02 was of 1,19 mmolm-2s-1 and for day 03/10/02 of 4,02 mmolm-2s-1. The values of removal of match had been of 1,98 mgP/L (18/07) and 0,98 mgP/L (03/10); the nitrate removal was of 5,4mgNO3-/L and 5,8 mgNO3-/L and the ammonia withdrawal was in 12,26 mgNH3-H/L and 13,20 mgNH3-H/L for days 18/07 and 03/10 respectively. During the period of study this can be verified that a bigger demand of removal in the initial phases of growth of the plant exists, if it must the biggest necessity of nutrients on the part of it and to the fact that in the final phases of development the plant tends to eliminate the plants in the center of the chambers of the wetlands, making with that the functioning of the wetland decays. It was also evidenced in the research that the biggest efficiency of the wetland how much the removal of composites of the sewer is understood in the interval between the 12 and 15 hours, since it is the moment of bigger active radiation (RFA) what it caused in a band of bigger daily transpiration rate of the plant

ASSUNTO(S)

leitos cultivados amonia fisiologia vegetal plantas - efeito do fosforo evapotranspiração

ACESSO AO ARTIGO

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