Key methods of drinking water pollution caused by heavy metals
Fu, Y.; Liu, X.; Chen, G.
Desalination and Water Treatment 125: 198-202
ISSN/ISBN: 1944-3994 Accession: 070880594
Aiming at the current situation of sudden water pollution in urban water supply system, based on the investigation and study of the main drinking water sources in the northwest China, the potential pollutants along the Yellow River coast were analyzed. First, the sudden heavy metal pollution in the Yellow River was simulated, and its emergency treatment measures were studied. Then, the different concentrations of chromium (VI) pollution in the Yellow River water source were simulated, and the removal method of heavy metals in drinking water sources with sudden heavy metal pollution was studied. Combined with the current water treatment technology commonly used in urban water purification plants in China, a rapid, simple and effective emergency treatment process that can be used directly in water purification plants was studied. The reduction rate of hexavalent chromium can be greatly improved by using ferrous sulfate reduction method. When the concentration of raw water in the hexavalent chromium was 0.25 mg/similar to 2 mg/L, 5 mg/L similar to 16 mg/L ferrous sulfate dosage can make effluent total chromium compliance. For the removal of high standard ratio (1 similar to 2 mg/L) of hexavalent chromium, the addition of ferrous sulfate was taken into account. From the economic point of view, 10 mg/L ferrous sulfate was added to a coagulant sedimentation tank. Powder activated carbon (0.035 g similar to 0.35 g) was added to the filter tank to meet the emission standard.