The role of inorganic carbon limitation in biological nitrogen removal of extremely ammonia concentrated wastewater.
The role of inorganic carbon limitation in biological nitrogen removal of extremely ammonia concentrated wastewater.
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DOI：
10.1016/s0043-1354(02)00440-2
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发表时间：
2003-03
期刊：
影响因子：
12.8
通讯作者：
B. Wett;W. Rauch
中科院分区：
文献类型：
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作者：
B. Wett;W. Rauch
从基本的生物化学过程中可以清楚地看出，极浓氨负荷的硝化需要-除其他外-（1）足够的碱度以缓冲酸化和（2）碳酸氢盐作为自养生物质的底物。然而，在低pH值下，曝气过程导致CO2剥离，从而减少可用的无机碳。为了分析这种复杂的相互作用，我们建议在本文中的增强版的广泛认可的IWA（原IAWQ）活性污泥模型。这些模型放大包括离子平衡的pH值和解离物种的计算，无机碳的平衡和相关的N-消除过程及其抑制的更详细的描述。该模型成功地用于优化废水和垃圾渗滤液的处理策略（500- 2000 mg氨-Nl −1，COD/N比为0.25-4）。详细的数据，从两个全面的拒绝水处理厂被用于系统识别，模型校准和验证。结果表明，亚硝酸（HNO 2）和非离子化氨（NH3）的抑制和限制往往被高估。在该研究中，碳酸氢盐浓度被证明对该过程至关重要。通过优化反应器中碳酸氢盐的浓度，可以将亚硝化速率提高到100 mg NH 4 +-Nl−1h−1。
It is clear from the fundamental biochemical processes that nitrification of extremely concentrated ammonia loads requires—among others—(1) sufficient alkalinity to buffer acidification and (2) bicarbonate as the substrate for the autotrophic biomass. However, at low pH values the aeration process causes CO2stripping and consequently a decrease of the available inorganic carbon. In order to analyse such complex interactions, we suggest in this paper an enhanced version of the widely acknowledged IWA (formerly IAWQ) activated sludge models. These model enlargements comprise an ion-balance for the calculation of the pH value and of dissociation species, a balance of inorganic carbon and a more detailed description of the relevant N-elimination processes and their inhibitions. The model was successfully employed to optimise a treatment strategy for rejection-water and landfill leachate (500–2000mg ammonia-Nl−1, COD/N ratio of 0.25–4). Detailed data from two full-scale rejection-water treatment plants were used for systems identification, model calibration and validation. The results suggest that inhibition and limitation by nitrous acid (HNO2) and unionised ammonia (NH3) have often been overestimated. In this investigation the bicarbonate concentration proved to be crucial for the process. The optimisation of the bicarbonate concentration in the reactor could improve the nitrozation rate up to 100mg NH4+-Nl−1h−1.