Remediation on landscaping water in northern China by compound zeolite filter
复合沸石滤床修复北方景观水体的实验研究

Natural zeolite, silver sand and coal cinder were chosen instead of traditional filling to construct ecological filter with plant on surface. Its running mode was upward combining with downwards flow to bio-remedy static lake water in Northern China. Static and dynamic experiments were carried respectively to study remediation efficiency. Effluent was recycled at different periods in dynamic parts. Data showed that removal rates of ammonia nitrogen (NH+4-N) were all higher than 85% in each pattern. The best removal rate reached 97% at recycling period of 1 h, it was 12.8 percents higher than that of static pattern; removal rate of total nitrogen (TN) could reach 84%. TP removal was slow and unstable. Coal cinder have low capacity to remove NH+4-N, halfway nitrification and denitrification made NH+4-N ,NO-2-N and NO-3-N concentration of effluent from under-layer higher than up-layer. Improving recycling rate could promote removal of nitrogen.