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Removal of Nitrogen and Phosphorus i n Fishpond Water /Sewage by Natural Z eolite

LIU Yuan-jin 1 ,ZHANG Xin-ming 1 ,LI Hua-xing 1 ,WANG Wen 1 ,ZHANG Fang-rong 2 (1.College of Resources and Environm ent,South China Agric.Univ.,Guangzhou 510642,China;2.Guangdong Exp loitation Bureau of Geologic Mineral Explo  
An experiment of removal of nitrogen and phosphorus in fishpond water /sewage by natural zeolite was conducted,and the changes of purifying water used for r aising goldfish with tea -bag pouched zeolite with time were also dealt wi th.It was shown that zeolite possessed effect of lowerin g total nitrogen,ammonia nitrogen,total phosphorus and inorganic phosphorus,and the more amount of zeolite added,the more red uction of nitrogen and phosphorus co ntents in water samples.However,fo r sewage with higher nitrogen and phosphorus,the removal effect became less.It was also show n that ground zeolite had a better eff ect in removing nitrogen and phosphorus within 10days,and th e effect would be less after 10days;c ompared with small blocky zeolite,g round zeolite be-haved better in removing nitrogen an d phosphorus in water used for raisin g goldfish,but a longer effect was fo und with small blocky zeolite,suggesting that a further s tudy was needed.
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