MBR工艺处理含50%海水的污水试验研究
Experimental study on treatment of wastewater containing 50% seawater by MBR process
-
摘要: 采用MBR工艺对含50%海水的污水生物处理进行了试验研究。实验条件为进水COD为300~2 600 mg/L,NH3-N为50~300 mg/L,pH值为6~9,混合液污泥浓度为7 000 mg/L,溶解氧浓度为2~4 mg/L,温度为20~25℃。试验结果表明,系统的最佳运行条件为:有机负荷<3.2 kg COD/(m3·d),氨氮负荷<0.35 kg/(m3·d),pH值在7.5~8.5之间,HRT>12 h。在此条件下,COD与氨氮的去除率可同时达到90%。高盐环境下微生物所分泌的大量胞外多聚物是造成MBR工艺处理含盐废水过程中膜污染的主要原因。Abstract: MBR process is used to treat wastewater containing 50% seawater under the conditions as belows: COD is 300~2 600 mg/L,NH3-N is 50~300 mg/L,pH is 6~9,MLSS is 7 000 mg/L,DO is 2~4 mg/L,temperature is 20~25℃.The results show that both COD and NH3-N removal can reach 90% under the best conditions as belows: organic loading and ammonia loading are less than 3.2 kg COD/(m3·d) and 0.35 kg/(m3·d) respectively, pH is between 7.5 and 8.5, HRT is more than 12 h. The extracellular polymeric substances(EPS) which are excreted by microorganism devote to membrane fouling largely in the process.
-
Key words:
- MBR process /
- organic loading rates /
- ammonia loading rates /
- pH /
- HRT /
- membrane fouling
-

计量
- 文章访问数: 12392
- HTML全文浏览数: 5052
- PDF下载数: 3553
- 施引文献: 0