Applicability of the Arrhenius model for ammonia oxidizing bacteria subjected to temperature time gradients

作者：Mannucci Alberto^*; Munz Giulio; Mori Gualtiero; Lubello Claudio; Oleszkiewicz Jan A

来源：Frontiers of Environmental Science and Engineering, 2015, 9(6): 988-994.

DOI：10.1007/s11783-014-0751-0

• nitrification rate
• temperature effect
• continuous titrimetric tests
• time-gradient temperature variations
• Ammonia Oxidizing Bacteria (AOB)

The aim of this work is to identify the range of applicability of Arrhenius type temperature dependence for Ammonia Oxidizing Bacteria (AOB) subjected to temperature time gradients through continuous titrimetric tests. An innovative online differential titrimetric technique was used to continuously monitor the maximum biologic ammonia oxidation rate of the biomass selected in a pilot scale membrane bioreactor, as a function of temperature time gradients. The monitoring technique is based on the measurement of alkalinity and hydrogen peroxide consumption rates in two parallel reactors operated in nonlimiting substrate conditions for AOB; both reactors were continuously fed with mixed liquor and in one of them AOB were inhibited with allylthiourea. The effects of temperature decrease rates in the range 1 to 4A degrees C center dot h(-1) were evaluated by controlling the titrimetric reactor in the temperature range 10A degrees C-20A degrees C. The dependence of growth kinetics on temperature time gradients and the range of applicability of Arrhenius model for temperature dependency of AOB growth kinetics were assessed. The Arrhenius model was found to be accurate only with temperature gradients lower than 2A degrees C center dot h(-1). The estimated Arrhenius coefficients (theta) were shown to increase from 1.07 to 1.6 when the temperature decrease rate reached 4A degrees C center dot h(-1).

• 出版日期2015-12