Identification of construction sludge generated by earth drilling

Earth drilling is a method of making trenches for constructing piles. In this method, bentonite slurry used to protect the porous wall during trench excavation. The sludge from defined as industrial waste under Japanese law. Nevertheless, some companies dispose construction illegally. However, there are no analytical methods identifying sludge. Bentonite must be detected identify in suspicious soils. But smectite clay main component bentonite, and often contained soil. It unknown whether soil interferes with detection To detect sludge, we analyzed soils spiked at various concentrations using X-ray diffraction. We also examined earth or without HCl treatment. peak was observed all samples, even when concentration 20% smectite. peaks were treatment; however, they smaller than expected. treatment removed chlorite peak, which near that allowing easier identification peaks. This study provided new insights into forensic analysis environmental crime samples.