Blackburne Richard, Yuan Zhiguo, Keller Jürg
Advanced Wastewater Management Centre, The University of Queensland, Brisbane, QLD 4072, Australia.
Biodegradation. 2008 Apr;19(2):303-12. doi: 10.1007/s10532-007-9136-4. Epub 2007 Jul 5.
Partial nitrification to nitrite (nitritation) can be achieved in a continuous process without sludge retention by wash out of nitrite oxidising bacteria (NOB) while retaining ammonia oxidising bacteria (AOB), at elevated temperatures (the SHARON process) and, as demonstrated in this paper, also at low dissolved oxygen (DO) concentrations. Enriched AOB was attained at a low DO concentration (0.4 mg l(-1)) and a dilution rate of 0.42 day(-1) in a continuous process. A higher oxygen affinity of AOB compared to NOB seemed critical to achieving this. This was verified by determining the oxygen half saturation constant, Ko, with similar oxygen mass transfer resistances for enriched AOB and NOB as 0.033+/-0.003 mg l(-1) and 0.43+/-0.08 mg l(-1), respectively. However, the extent of nitritation attained was found to be highly sensitive to process upsets.
通过在高温下（SHARON工艺）冲洗亚硝酸盐氧化细菌（NOB）同时保留氨氧化细菌（AOB），可以在无污泥停留的连续过程中实现部分硝化至亚硝酸盐（亚硝化），并且如本文所示，在低溶解氧（DO）浓度下也能实现。在连续过程中，当溶解氧浓度低至0.4mg/L（-1）且稀释率为0.42d（-1）时，可获得富集的氨氧化细菌。与亚硝酸盐氧化细菌相比，氨氧化细菌对氧具有更高的亲和力似乎是实现这一目标的关键。通过测定氧半饱和常数Ko验证了这一点，对于富集的氨氧化细菌和亚硝酸盐氧化细菌，在相似的氧传质阻力下，氧半饱和常数Ko分别为0.033±0.003mg/L（-1）和0.43±0.08mg/L（-1）。然而，发现亚硝化程度对工艺波动高度敏感。
