摘要：The efficiency of bio-tricking filter used for domestic sewage, livestock wastewater, food wastewater, etc. was universally dependent on zeolite size distribution, however its influence rule for black water treatment is still unclear now. In this study, we constructed five kinds of bio-trickling filters loaded with different size distribution of zeolite to systematically investigate the removal characteristics of turbidity, ammonia nitrogen (NH4+-N), total nitrogen (TN), total phosphorus (TP) and chemical oxygen demand (COD) of black water. The results showed that under the same hydraulic loading and influent water quality, the filter filled of small (5mm or less) size zeolite and another one covered with large-size (15-30mm), medium-size (5-15mm), small-size in sequence were better than those filled with large and medium size zeolite respectively or the mixture of three size on the removal efficiency of turbidity, NH4+-N, TN, TP and COD. Although the removal efficiency of the filter filled of small size zeolite was similar to layered model, layered model gave optimal performance for treating water considering the issues of cost and clogging. When the average concentrations of turbidity, NH4+-N, TN, TP, COD were 286.5 NTU, 116.1 mg/L, 159.8 mg/L, 14.9 mg/L, 742.4 mg/L in black-water, the layered model reached them reduction of 88.6%, 97.3%, 70.5%, 22.5%, 77.2%.
关键词：size distribution;bio-trickling filter;zeolite;black water
