BIOLOGICAL SLUDGE TOXICITY, FROM PRODUCED WATER TREATMENT AT TERMINAL MARÍTIMO ALMIRANTE BARROSO, SÃO SEBASTIÃO, SÃO PAULO STATE, BRAZIL

ABSTRACT

One of oil production characteristics is the mixed water volume co-produced. This water contain must be eliminated before refinery processing, originating a wastewater known as Produced Water. These waste treatment systems are designed by a combination of different methodologies, looking for greater treatment efficiency. In the mean time, treatment processes generate byproducts that need an ultimate disposal. This paper objective is to evaluate the solubilization product toxicity, from a biological sludge, produced at a Pilot Produced Water Treatment Facility, located on Terminal Marítimo Almirante Barroso. The species: Barabarea verna Mill., Brassica. oleraceaL., Cucumis. sativus L. and Eruca. sativa Mill., were used for bioassays tests based on germination percentage, germination velocity and root/hypocotyls elongation. Results indicate B. verna greater solubilization product germination sensibility, the remaining species showed a critical concentration of solubilization product about 25%. The root/hypocotyls elongation tests indicate E. sativa and B. oleracea greater resistance, with root inibitory concentration (IC ₅₀) of 23.61% and 16.64% respectively and, IC₅₀ for hypocotyls about 18% for both species.

KEY WORDS
Salinity; germination; root elongation; petroleum