PH19 Biomonitoring
Exhibit Hall
8:00 AM - Thursday
(PH216) The Effect of Discharge of Pulp and Paper Mill Effluent on Plancktonic Community in a Brazillian River.
Paiva, A1, Baptista, I1, Soares, C1, 1 Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
ABSTRACT- The objective of this study was to analyze water sample of River Canoas, SC, Brazil, under impact of the pulp and paper mill effluent using a conventional bleaching process (O, C, E, D, E). Three sites located downstream of the effluent discharge point were sampled. Another site, upstream from this point, was used as reference. The water sample was collected in a Van Dorn bottles in different dates and the physical-chemical analyses were accomplished according to the APHA standard method. Phenol concentrations around 4,01 mg/L, sulfide of 0,01 to 1.45 mg/L, phosphorus from 0,1 to 2,16 mg/L, nitrite from 0,02 to 0,86, nitrate from 0,10 to 1,27, ammonia from 0,0006 to 0,04, oils and greases from 10,3 to 148,1 ppm, were found in the sample. The physical-chemical analyses indicated that the Canoas river suffers a considerable impact caused by the effluent discharge. Seasonal effects also were evaluated during 2003. Planktonic community exhibited a poor biodiversity and a small number of individuals, being the Melosira genera the predominant one in all sites studied. Culture of microalgae Scenedesmus subspicatus in experiments performed in laboratory and using river water samples presented a very low growth ratio. Project financed by CNPq.
Key words: river planktonic community, pulp and paper, environmental impact, Melosira