Abstract
Effect of inorganic salt modification on efficiency of zeolite barrier to control phosphorus and nitrogen re- lease from sediments was analyzed.The results show that:(1)Sorption of ammonium on zeolite was influenced less by modification of NaCl or CaCl_2.However,in comparison to natural zeolite,NaCl modification zeolite will release more Na~+ and less Ca~(2+),and CaCl_2 modification zeolite will release less Na~+ and more Ca~(2+).(2)The efficiency of zeolite barrier to control ammonia release will be influenced little by modification of NaCl or CaCl_2.However, the efficiency of zeolite barrier to control phosphorus release will be greatly affected by modification of NaCl or CaCl_2,and in order of CaCl_2 modification zeolite＞natural zeolite＞NaCl modification zeolite.(3)The mechanics of zeolite barrier for controlling ammonia release is physical sorption and ion exchange,and zeolite barrier reduces phosphorus release rate depends on its trapping and immobilization of Ca~(2+)that was released from zeolite.
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