Izvorni znanstveni članak
Bioaccumulation Dynamics of a PCB Low-level Discharge in a Riverine Pathway Downstream the Release Point
G. Maria
; Laboratory of Chemical & Biochemical Reaction Engineering, University Politehnica of Bucharest, P.O. 35-107 Bucharest
C. Maria
; Research & Engineering National Institute for Environment (ICIM) Bucharest, Spl. Independentei 294
Sažetak
The low biodegradability and high persistence in environment of POPs (persistent organic pollutants), and especially some of them such as PCBs (polychlorinated biphenyls), make their removal difficult and incomplete in conventional wastewater treatment
plants (WWTP). A low-level quasi-continuous release of such pollutants in rivers,fluctuating around or beyond the admissible levels, is a quite common problem especially for discharges from large industrial plants. If the discharge contains a low-level
pollutant load, such a problem apparently seems not to be so critical due to the fast pollutant dispersion over a relatively short section of the river pathway, i.e. over a few dozen meters downstream the WWTP release point. However, this problem can turn into
a serious one if the pollutant is a POP, even for small concentrations in the WWTP effluent, due to their known high bioaccumulation capacity in biota and sediments. For this last case, the paper illustrates, by means of a relatively simple dynamic model and two
case studies, how the dispersion and bioaccumulation critical zone of a PCB near the release point tends to move slowly downstream.
Ključne riječi
Pollutant dispersion; bioaccumulation; PCB; river pollution
Hrčak ID:
38313
URI
Datum izdavanja:
30.6.2009.
Posjeta: 885 *