Abstract
Polychlorinated naphthalenes (PCNs) and Hexachlorobutadiene (HCBD) have been designated as part of the new POPs under the Stockholm Convention. These are either intentionally or unintentionally left in various industrial products and disposed of in landfills. Furthermore, PCNs are similar in structure to PCBs and are contained in the incineration residue as combustion by-products. With a target of developing long-term, appropriate management of landfills, we clarify the actual concentration of these POPs in landfill leachates and study the breakdown process in wastewater treatment. In order to efficiently grasp the actual situation occurring in various parts of Japan, we have developed a simultaneous analysis method that uses analysis items such as dioxins, VOCs, and 1,4-dioxane, which already have standard values and are frequently measured. The PCNs concentration in the leachate amounts to several pg/L to several hundred pg/L, the HCBD is less than the Method Detection Limit (0.015 μg/L). PCNs are removed by wastewater treatment and measure several pg/L in the effluent water.
