序批式生物膜反应器不同填料挂膜及短程硝化特性研究

以实际生活污水为研究对象,采用序批式生物膜反应器(SBBR),填充不同种类的填料,针对其各自的挂膜特征和短程硝化的实现与稳定的特性进行了研究.结果表明,与立方体海绵填料相比,炭纤维填料的SBBR能够更快地实现挂膜启动,硝化效果稳定、高效(NH_4~+-N去除率高达99.3%);立方体海绵填料更易在常温下,实现NO_2~--N大量积累的短程硝化,但是相比而言,硝化效率不高.升高温度至30 ℃左右时,能够在30 d内实现炭纤维填料的短程硝化,通过过程控制可以实现短程硝化的稳定.荧光原位杂交技术(FISH)检测结果证实,SBBR中短程硝化的实现与稳定是因为菌群得到了优化,氨氧化细菌成为优势菌种.

Startup and partial nitrification characteristics in sequencing batch biofilm reactor (SBBR) with two kinds of media

The biofilm-culturing startup and partial nitrification characteristics in two lab-scale sequencing batch biofilm reactors with fixing carbon fiber media and floating BioCube sponge media treating real municipal wastewater were studied. The experimental results showed that the startup speed of carbon fiber media with a higher ammonia nitrogen removal rate (nearly 99.3%) was more rapid compared to the BioCube sponge media, which could easily achieve and stabilize partial nitrification at normal temperature (20-25 ℃) and DO (2-3 mg/L). The partial nitrification in SBBR with carbon fiber media was realized at higher temperature(30 ℃) and the ammonia nitrogen removal in SBBR with sponge media was improved at higher temperature. Furthermore, the key factor of achieving and stabilizing partial nitrification for a long time was optimization of nitrifying microbial population, which was proved by FISH analysis.