Abstract
Polychlorinated biphenyls (PCBs) are one of the persistent organic pollutants (POPs) used worldwide between the 1930s and 1980s. Many PCBs can still be found in the environment such as in soils and sediments, even though their use has been heavily restricted. This review summarizes the most frequent remediation solutions including, phytoremediation, microbial degradation, dehalogenation by chemical reagent, and PCBs removal by activated carbon. New insights that emerged from recent studies of PCBs remediation including supercritical water oxidation, ultrasonic radiation, bimetallic systems, nanoscale zero-valent iron based reductive dehalogenation and biofilm covered activated carbon, electrokinetic remediation, and nZVI particles in combination with a second metal are overviewed. Some of these methods are still in the initial development stage thereby requiring further research attention. In addition, the advantages and disadvantages of each general treatment strategy and promising technology for PCBs remediation are discussed and compared. There is no well-developed single technology, although various possible technologies have been suggested. Therefore, the possibility of using combined technologies for PCB remediation is also here investigated. It is hoped that this present paper can provide a basic framework and a more profound prospect to select successful PCB remediation strategies or combined technologies.
Highlights
Polychlorinated biphenyls (PCBs) have been used for industrial purposes since 1929 (Alcock et al, 1994)
The results of this study indicated that reduction of PCBs in AC-amended soil is mainly attributed to a decrease in trichlorobiphenyl and tetrachlorobiphenyl congeners
The results showed that dehalogenation performance was enhanced by 34% after adding 10 mg g−1 of Nanoscale Zero-Valent Iron (nZVI) to soil containing 1 mg/kg for 140 days
Summary
Polychlorinated biphenyls (PCBs) have been used for industrial purposes since 1929 (Alcock et al, 1994). Once released into the environment PCBs they could bioaccumulate within the food chain, due to their high affinity for organic materials. They have been found in human’s tissues, blood, and breast milk and are introduced via the consumption of meat, fish, and dairy products (Van den Berg et al, 2006). They have been linked to chronic effects in humans including immune system damage, decreased pulmonary function, bronchitis, and interferences with hormones leading to cancer (Schecter et al, 2006).
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