The Application Of Anthracite Padding On Biological Removal Of Iron And Manganese In Water Supply Plant

Jiamusi Water Supply Plant is a typical groundwater plant using source water with high concentration of iron and manganese. The concentrations of iron and manganese in the source were 14~18mg/L and 0.6~1.0mg/L. Biological iron and manganese removal technology was used in the plant. We chose anthracite sand instead of normal manganese sand and quartz sand for the filter.The operation rules and engineering managements were investigated. Base on the theory of biological iron and manganese removal technology, on-site bend and pilot experiments were performed anthracite as padding. Seed sludge was the sludge sticking on the aeration tank of seventh Water Supply Plant. Domestication condition was 2m/h of filtration velocity and 11L/(s·m2) of backwash intensity after continuous aeration of enhanced cultivation. The cultivation last for about 3~5 months under the low filtration velocity and weak backwash intensity before effluent water quality met the national standard of drinking water. The filtration velocity was gradually increased to 6m/h in 1m/h stepwise. After about 6 months, the total removal efficiency of iron and manganese was 99.5% and 99% respectively. The concentration of iron and manganese in influent was 14~18mg/L and 0.5~1.0mg/L, and in the effluent was 0.05mg/L and 0.05mg/L respectively, which is lower than the National Drinking Water Standard(Fe<0.3mg/L,Mn<0.1mg/L).Jiamusi Water Supply Plant is the largest plant not only in China but also in the world with capacity of 2.0×105m3/d. It is the first plant using anthracite as the filtration package. The project found a high-quality filter marial and explored a cultivation method. The low density, high hardness and large pore ratio of anthracite benefit the technology. The material also shorts the maturing time, enhances the the filtration stability and saves the backwashing water.This research aims at widenning the application of Biological Removal of Iron and Manganese and promotes the development of this technology in the future.