Sedimentation rate of coal suspension for different doses of flocculant. Based on these calculations, it can be seen that the sedimentation rate for a sample with the addition of 200 ppm of flocculant is several hundred times greater than that of sedimentation without a flocculant. This confirms the necessity of using flocculant.
Coal mining in basins draining into the lake has caused concern about changes in the water quality and the rate of sedimentation in Lake Tuscaloosa. Fourteen sites in the North River basin were sampled to determine if sur face coal mining has impacted the quality of water in the lake and selected tributaries.