| 连续流好氧颗粒污泥系统处理低COD/N实际生活污水的工艺优化 |
| 摘要点击 3288 全文点击 1753 投稿时间：2015-03-25 修订日期：2015-05-26 |
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| 中文关键词 连续流 好氧颗粒污泥 低COD/N 实际生活污水 工艺优化 |
| 英文关键词 continuous-flow aerobic granular sludge low COD/N ratio actual sewage process optimization |
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| 中文摘要 |
| 在连续流合建式反应器中接种成熟好氧颗粒污泥处理低碳氮比(COD/N)的实际生活污水,研究了曝气量和水力停留时间(hydraulic retention time, HRT)对连续流好氧颗粒污泥系统脱氮除磷和颗粒污泥稳定性的影响. 结果表明,当曝气量为300mL·min-1(表观气速为1.2 cm·s-1)、HRT为7.5 h时,反应器对化学需氧量(chemical oxygen demand, COD)、总氮(total nitrogen, TN)和总磷(total phosphorus, TP)去除率达到最高,分别为76.34%、51.23%和53.70%. 整个系统在此条件下能够稳定运行,污泥浓度(mixed liquor suspended solids, MLSS)为2000 mg·L-1左右,污泥体积指数(sludge volume index, SVI)保持在50 mL·g-1以下,好氧颗粒污泥形态完整,沉降性能良好. 低COD/N的实际生活污水促进了好氧颗粒污泥胞外多聚物(extracellular polymeric substance, EPS)的增长,蛋白质(protein, PN)和多聚糖(polysaccharide, PS)的比值高达17.9,相对于PS,PN对颗粒污泥的稳定性有更大的促进作用. |
| 英文摘要 |
| The mature aerobic granular sludge (AGS) was inoculated in a continuous-flow joint constructor reactor to treat low chemical oxygen demand/nitrogen (COD/N) ratio sewage.The effects of aeration intensity and hydraulic retention time (HRT) on the denitrification and phosphorus removal efficiencies and the granular sludge stabilization were investigated.When the aeration intensity was 300mL·min-1 (superficial air upflow velocity of 1.2 cm·s-1) and the HRT was 7.5 h, the average removal efficiencies of COD, TN and TP were 76.34%, 51.23% and 53.70%, respectively.The mixed liquor suspended solids (MLSS) was only about 2000 mg·L-1, the sludge volume index (SVI) was below 50 mL·g-1, and the AGS exhibited complete forms and good settling performances.Additionally, the low COD/N ratios sewage could promote the production of extracellular polymeric substances (EPS) of AGS, and the PN proteins in EPS played a pivotal role in the maintenance of AGS stabilization. |
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