Hidetaka TAKIGAMIand Shin-ich SAKAI During dredging of contaminated sediment as an environmental countermeasure, it is important to prevent secondary environmental pollution caused by turbidity generation. Especially, protection against dioxin diffusion should require control of suspended solids (SS). In this paper, "environmental dreading method" and " real-time waterquality monitoring system" we have developed were reported, that have been found suitable to practical application. As the result of on-site investigation, actual measurements of turbidity during the "environmental dreading method" demonstrated that it could effectively reduce turbidity compared to previously established methods. In addition, a new real-time water quality (SS) monitoring technique and a framework of its operation combined with an environmental dredging were proposed.
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