微氧颗粒污泥的快速培养及其同步脱氮效能

Rapid cultivation and simultaneous denitrification of micro-aerobic granular sludge

采用颗粒污泥膨胀床反应器接种剩余污泥,以生活污水为基质,在1个月内快速培养成功微氧颗粒污泥。污泥平均粒径达0.73 mm,沉降迅速,具有较好的COD去除和同步脱氮能力。在HRT=6 h,回流比为8.0,充氧速率为0.25 g/(L.d)时,反应器COD去除率可达90%左右,出水COD<50 mg/L;氨氮和总氮去除率分别为72%～89%和76%～87%,出水质量浓度分别为3～12、5～14 mg/L。回流稀释和充氧速率对微氧体系同步脱氮产生重要影响。

Expanded granular sludge bed （EGSB） reactor being used for inoculating residual sludge and domestic sewage as substrate, micro-aerobic granular sludge can be cultivated rapidly and successfully within one month. The average granular sludge diameter is 0.73 mm,and its settling speed is rapid,having pretty good COD removing efficiency and simultaneous denitrification capacity. When the hydraulic retention time （HRT） is 6 h,reflux ratio 8.0, and oxygenation rate 0.25 g/（L. d）, the COD removing rate of the reactor can reach 90% or so, and effluent COD below 50 mg/L. The removing rates of ammonium-nitrogen and total nitrogen are 72%-89% and 76%-87%, respectively,and effluent mass concentrations down to 3-12 mg/L and 5-14 mg/L,respectively. The results show that the reflux dilution and oxygenation rate have important effects on micro-aerobic system simultaneous denitrification.