厌氧氨氧化细菌在生物膜系统中起主要脱氮作用的模拟预测

废水有机物对亚硝化 厌氧氨氧化(ANAMMOX)生物膜系统的影响借助已建立的自养生物膜模型(CANON)与活性污泥3号模型结合进行了理论模拟.被结合的数学模型可以模拟生物膜中自养菌与异养菌活性以及所涉及的全部内在反应(碳氧化、硝化、反硝化、厌氧氨氧化).模拟显示,废水有机物对亚硝化 厌氧氨氧化生物膜系统影响不大;生长稳定的生物膜系统中异养菌反硝化不是脱氮的主反应(最大脱氮作用20%);厌氧氨氧化左右着脱氮功能.除废水中有机物可被全部去除外,当溶解氧最佳时,系统总氮去除率亦可高达90%.

Model-based prediction of ANAMMOX as major contribution to (N-removal) from biofilm systems

A model evaluating influence of COD on a partial nitrification-ANAMMOX biofilm process is incorporated on the basis of the heterotrophic growth as described in ASM3, supplemented with a previously published model for the autotrophic reactions (Nitrification and ANAMMOX). This biokinetic model has been incorporated in the biofilm compartment of the AQUASIM simulation software. This incorporated model can simulate the activities of heterotrophs and autotrophs involved in a biofilm, and related reactions between COD oxidation, denitrification, nitrification and ANAMMOX, etc. can be qualitatively demonstrated. Simulations indicate that COD in the influent has no important influence on the partial nitrification-ANAMMOX biofilm process. Besides efficient COD removal, a total nitrogen removal efficiency of about 90% could be expected. Furthermore, ANAMMOX is a major contributor to the total nitrogen removal and conventional denitrification only takes a share of <20% in the total nitrogen removal. COD presence in the influent only increases the optimal DO level for the maximal dinitrogen gas production. With normal loads and working conditions, further simulations reveal that there could be ANAMMOX organisms in normal biofilm systems. In other words, ANAMMOX might be present in many nitrifying biofilm systems.