加炭焙烧改性膨润土吸附—混凝联用处理微污染水源水研究

A Study on Adsorption-Coagulation Treatment of Micro-polluted Source Water by Bentonite Modified by Carbon-Entraining and Roasting

采用加炭焙烧改性膨润土和混凝剂PAC、壳聚糖联用处理微污染水源水，探讨其对微污染水源水中CODMn、氨氮、浊度的去除性能和最佳处理条件。发现。加炭焙烧改性膨润土用量7g／L，吸附搅拌强度200r／min，吸附时间30min，PAC投加量35mg／L，壳聚糖投加量1．75mg／L，混合搅拌强度260r／min，混合时间120S，絮凝搅拌强度70r／min，絮凝搅拌时间15min，静沉15min为最佳处理条件；CODMn、氨氮、浊度的最佳去除率分别达到65．38％、56．74％、97．42％。实验揭示了加炭焙烧改性膨润土-PAC-壳聚糖吸附-混凝联用对微污染水源水的处理效果比单独混凝有较大程度提高，为微污染水源水的处理提供了新的吸附材料和方法，值得推广应用。

Bentonite modified by carbon-entraining and roasting was examined for its ability to remove CODMo, ammonia and turbidity in micro-polluted source water with coagulant PAC and chitosan joining in. According to the tests, the optimum hydraulic conditions were determined as follows： the dose of modified bentonite 7 g/L, adsorption stirring 200 rpm for 30 minutes, dose of PAC 35 mg/L, dose of chitosan 1.75 mg/L, mixing stirring 260 rpm for 120 seconds, flocculation mixing 70 rpm for 15 minutes, and the settling duration 15 minutes. The removal rates of CODMn, ammonia and turbidity could be up to 65.38%, 56.74% and 97.42%, respectively. The tests have indicated that the modified bentonite combined with PAC and chitosan had greater effect than sole coagulation process so as to provide new adsorbing materials and methods for the treatment of micro-polluted source water.