天然沸石在水处理中应用的中试研究

Pilot Experiment on Application of Natural Zeolites in Water Treatment

本中试主要研究天然沸石应用于微污染水源水中氨氮去除的各种影响因素和再生条件。试验结果表明:试验中所用缙云沸石对有机物的处理能力有限,对氨氮的去除率受进水浓度影响很大。在进水氨氮浓度较低时,可能出现氨氮的反吐现象。此时若以出水氨氮浓度为沸石交换终点,就造成了沸石交换容量的浪费,建议后续设置生物活性炭工艺,保障出水达标,延长沸石工作周期。在保证一定接触时间的前提下,采用10-16m/h的流速,对氨氮的去除效果相差不大。沸石再生可采用流动再生方式,试验中沸石再生的参数:pH值为11,6%NaCl,流速为5m/hr,再生时间为2小时左右,再生速度快,效果好。但综合考虑经济性、实用性,可适当降低流速,同时适当延长再生时间。

this pilot experiment focuses on the influencing factors and reclaiming conditions of natural zeolites applied to remove ammonia from slightly polluted raw water. The ability of organic matter removal by Jiyun zeolites is limited, and the ratio of ammonia removal is considerably influcenced by ammonia concentration in influent water. When the concentration is low, maybe ammonia leakage happens. If this leakage point is chosen as the final exchange point, the zeolite exchange volume is wasted. So the following biological carbon process is suggested to meet the regulation of water quality and extend the period of zeolite absorption .The experiment adopts the filter flow of 10？ 16m/h,and the effect of ammonia removal is similar when the hydraulic retention lime is enough .The reclamation parameters of zeolite is adopted in the pilot experiment as follows, pH： 11, NaCl：6%, filter flow： 5m/hr. Considering the economical and practical operational cost,the suggestion is given to adopt the lower flow for zeolite reclamation.