METHOD OF PREPARATION FOR LOW BASICITY POLYALUMINUM CHLORIDE COAGULANT AND TREATING METHOD OF WATER/WASTEWATER USING THE SAME

摘要

PURPOSE: A method for preparing polyaluminum chloride coagulants with low basicity and a water treating method using the same are provided to prevent the reduction of remaining aluminum and the occurrence of coloring phenomenon. CONSTITUTION: A first resultant product is generated by introducing aluminum hydroxide and hydrochloric acid. The first resultant product is polyaluminum chloride represented by chemical formula 1. The content of aluminum oxide in the polyaluminum chloride is in a range between 15 and 18%. The first resultant product is reacted with hydrochloric acid as a basicity adjusting agent to generate polyaluminum chloride with low basicity represented by chemical formula 2. The basicity of the polyaluminum chloride with low basicity is in a range between 10 and 20%. In chemical formula 1, n is between 1.5 and 5.5, inclusively; and m is 10 or less. In chemical formula 2, n is between 0.5 and 3, inclusively; and m is 10 or less.