悬浮滤料在上向流反硝化滤池中试装置中的应用

以聚苯乙烯泡沫滤珠作为上向流反硝化滤池的滤料,在中试装置中考察了此种悬浮滤料的脱氮效果及其过滤功能.试验结果表明:在进水流量为13.5 m3/h的情况下,随着碳氮质量比(碳氮比)的升高,NO3--N去除率逐渐提高,出水COD也逐渐提高,适宜的碳氮比为5,此条件下出水COD小于50 mg/L;水力停留时间(HRT)越长,...

Application of suspended filter medium in pilot plant of upflow denitrification filter

Polystyrene foam filter bead was used as filter medium in upflow denitrification filter,and the denitrification effect and filtering function of this suspended filter medium were investigated in a pilot plant.The test results show that:When the inlet water flow rate is 13.5 m³/h,the NO₃^--N removal rate and the effluent COD gradually increased with the increase of carbon-nitrogen ratio,andthe effluent COD is less than 50 mg/L under the appropriate carbon-nitrogen ratio of 5;The longer the hydraulic retention time(HRT),the better the denitrification effect,and accordingly,the HRT is selected as 60 min;The flow speed of the wastewater should control at 6-8 m/s,so that the effluent SS can be below 10 mg/L and steadily meet the standard of discharge.The removal of pollutants by this filter is mainly realized in the first half along the direction of water flow.The removal of NH₄⁺-N and NO₃^--N is basically completed in the 0-90 cm area along the layer height,which contributes 96.99%and 96.87%of NH₄⁺-N and NO₃^-N removal rate,while the remaining second half of the filter medium has a weak effect on pollutants removal.