摘要
将内循环吸附与膜分离技术联合,开发一种新型饮水除氟工艺。为明确工艺特性,以模拟高氟水为实验原水,采用连续流小试装置,通过单因素实验和响应面法分析了HRT、吸附剂投加量2个重要参数对工艺除氟效能的影响规律。结果表明,HRT与活性Al_2O_3投加量对工艺的除氟效能均存在显著影响,在一定条件下存在最优值。响应面分析结果表明,最佳条件为:HRT=3.2 h,活性Al_2O_3投加量为5 g·L-1。该条件下,出水氟浓度最低可降至0.2 mg·L-1,在瞬时出水氟浓度与累积出水平均氟浓度超标前,单位活性Al_2O_3的处理水量分别为1.15 t·kg-1和1.36 t·kg-1;工艺运行过程中,TMP处于较低水平且增加缓慢,表明膜污染程度较小;基于吸附原理与物料平衡原理建立了工艺连续流动态数学模型,模拟得出的出水氟浓度动态变化曲线与实测结果较为一致。
A new method of fluoride removal was developed by adding a membrane into a pneumatic inter- nal circulating fluid-bed adsorption reactor. The HRT and adsorbent dosage are the two most important parame- ters for this process. Their influences on the fluoride removal were studied by a series of single-factor tests and the response surface method （RSM） with a pilot test device. The results indicate that both factors have a marked influence on the fluoride removal, and can be optimized. The optimum values of the HRT and the dosage of A1203 in this study were 3.2 h and 5 g · L-1, respectively. Under these conditions, the lowest concentration of F- in the effluent was 0.2 mg · L-1 ; 1 kg of activated A1203 could treat an average of 1.15 t and 1.36 t water for the instantaneous F- of effluent and the average F- of cumulative treated water, respectively. During device operation, the low level of TMP suggested that minor membrane fouling had occurred. The model developed to predict the time variation of F- in the effluent was based on the theoretical adsorption and material balance equa- tion, where the predicted dynamic curve of F- in the effluent was identical to that of the measured curve.
出处
《环境工程学报》
CAS
CSCD
北大核心
2016年第9期4698-4704,共7页
Chinese Journal of Environmental Engineering
基金
国家高技术研究发展计划(863)项目(2012AA062605)
关键词
饮水
除氟
吸附
膜分离
drinking water
defluorination
adsorption
membrane separation
