造粒流化床反应器去除地下水中硬度试验研究

Hardness Removal of Underground Water in Fluidized Pellet Bed Reactor

造粒流化床反应器很早就被应用于水质软化过程。通过中试研究了造粒流化床反应器在不同pH值、晶种粒径、水力条件下处理效能和压力的变化。结果表明：针对当地水质，在反应器填充0．1-0．25mm石榴石晶种、上升流速为60—100m／h条件下，最佳投药量为110mg／L，此时反应器出水pH值约为9．4，出水硬度为80mg／L，去除率大于70％，碳酸氢盐为150mg／L，出水浊度〈1．0NTU，对铁、锰的去除率分别约为40％和60％。结晶颗粒增长速率约为1．96×10^-9m／s，排放粒径为0．9—1．2mm，碳酸钙质量分数〉99％。当水处理量为8000m3／d时，单位处理成本为0．65元／m3。这为实际工程建设提供了参考。

Fluidized pellet bed reactor has been used in water softening process very early. The efficiency and pressure changes of the reactor under conditions of different pH values, particle sizes of seeds, hydraulic conditions were studied through pilot-scale experiment. The results showed that when the reactor was filled with garnet with the size of 0.1 mm to 0.25 mm and the upward rate was controlled in the range of 60 m/h to 100 m/h, the optimal dosage was 110 mg/L for the local water quality. At this time, the effluent pH value was 9.4, the effluent hardness was 80 mg/L with its removal rate of greater than 70%, bicarbonate was 150 mg/L, the effluent turbidity was less than 1.0 NTU, and the removal rates of iron and manganese were about 40% and 60%, respectively. The growth rate of crystal pellet was about 1.96 × 10 ^-9 m/s, discharge size was about 0.9 mm to 1.2 mm, and calcium carbonate mass percentage was greater than 99%. When the water treatment capacity was 8 000 m3/d, the unit cost of water treatment was 0.65 yuan/m3. It can provide the reference for engineering construction.