Influence of dissolved oxygen concentration on nitrite accumulation in a biofilm airlift suspension reactor

被引:7
|
作者
Garrido, JM
vanBenthum, WAJ
vanLoosdrecht, MCM
Heijnen, JJ
机构
[1] DELFT UNIV TECHNOL, DEPT BIOCHEM ENGN, KLUYVER LAB BIOTECHNOL, NL-2628 BC DELFT, NETHERLANDS
[2] UNIV SANTIAGO COMPOSTELA, DEPT CHEM ENGN, SANTIAGO DE COMPOSTELA 15706, SPAIN
关键词
airlift reactor; BAS reactor; biofilm; nitrification; nitrite; oxygen transfer; residence time;
D O I
暂无
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The biofilm airlift suspension (BAS) reactor can treat wastewater at a high volumetric loading rate combined with a low sludge loading. Two BAS reactors were operated, with an ammonium load of 5 kg N/(m(3) d), in order to study the influence of biomass and oxygen concentration on the nitrification process. After start-up the nitrifying biomass in the reactors gradually increased up to 30 g VSS/L. Due to this increased biomass concentration the gas-liquid mass transfer coefficient was negatively influenced. The resulting gradual decrease in dissolved oxygen concentration (over a 2-month period) was associated with a concomitantly nitrite build-up. Short term experiments showed a similar relation between dissolved oxygen concentration (DO) and nitrite accumulation. it was possible to obtain full ammonium conversion with approximately 50% nitrate and 50% nitrite in the effluent. The facts that (i) nitrite build up occurred only when DO dropped, (ii) the nitrite formation was stable over long periods, and (iii) fully depending on DO levels in short term experiments, red to the conclusion that it was not affected by microbial adaptations but associated with intrinsic characteristics of the microbial growth system. A simple biofilm model based on the often reported difference of oxygen affinity between ammonium and nitrite oxydizers was capable of adequately describing the phenomena. Measurements of biomass density and concentration are critical for the interpretation of the results, but highly sensitive to sampling procedures. Therefore we have developed an independent method, based on the residence time of Dextran Blue, to check the experimental methods. There was a good agreement between procedures. The relation between biomass concentration, oxygen mass transfer rate and nitrification in a BAS reactor is discussed. (C) 1997 John Wiley & Sons, Inc.
引用
收藏
页码:168 / 178
页数:11
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