Impact of Free Ammonia and Free Nitrous Acid on Nitritation in Membrane Aerated Bioreactors Fed with High Strength Nitrogen Urine Dominated Wastewater
Impact of Free Ammonia and Free Nitrous Acid on Nitritation in Membrane Aerated Bioreactors Fed with High Strength Nitrogen Urine Dominated Wastewater
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DOI：
10.1016/j.jece.2021.107001
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发表时间：
2021-12
影响因子：
7.7
通讯作者：
Maryam Salehi Pourbavarsad;Behnaz Jalili Jalalieh;N. Landes;W. Jackson
中科院分区：
文献类型：
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作者：
Maryam Salehi Pourbavarsad;Behnaz Jalili Jalalieh;N. Landes;W. Jackson
对于高氮(N)浓度或低碳氮比（C/N）的废水，通过传统的脱氮工艺，硝化可以帮助降低氨氧化处理成本，并促进厌氧氨氧化过程。游离亚硝酸盐（FNA）或游离氨（FA）对亚硝酸盐氧化菌（NOB）有抑制作用。只有少数研究评估了TN浓度升高时的硝化控制，而没有研究评估TN浓度低于2000 mg/L时的硝化控制，这是禁闭动物饲养操作（cafo）或源分离废水的特征。本研究评价了膜曝气生物反应器（MABRs）处理尿液为主的废水（670-4900 mg- n /L），在DO bb0 ~ 3mg /L条件下无固体废物浪费时促进硝化的因素。FNA浓度> 0.2 mg-N/L和/或FA浓度> 3 mg-N/L部分抑制NOB，这与在低强度废水研究中观察到的抑制浓度相似。FNA bbb10 1 mg-N/L完全抑制NOB。直接添加亚硝酸盐（NO2-）或操纵pH来增加FNA或FA，甚至可以抑制已建立的NOB种群，导致稳定的硝化。对于TN浓度约为1000mg /L的尿液为主的废水或设计用于产生总氨氮（TAN）与NO2-（前厌氧氨氧化）比例约为1:1的废水的反应器，所有操作模式（负荷或pH）都抑制NOB。这些结果扩展了MABRs在处理高TN浓度、尿液为主的废水中的应用。mabr是偏远地区或其他应用（离网社区，cafo，欠发达国家）的理想选择，这些地区无法支持复杂的pH或DO控制系统，从而消除了对固体处理的需求。
Nitritation can help lower ammonia oxidation treatment costs through traditional nitrogen removal processes for wastewaters with high nitrogen (N) concentrations or low carbon to nitrogen ratios (C/N) and facilitate the anammox process. Free nitrous acid (FNA) or free ammonia (FA) can inhibit nitrite oxidizing bacteria (NOB). Only a few studies have evaluated control of nitritation at elevated TN concentrations and none for TN concentrations > 2000 mg/L, characteristic of confined animal feeding operation (CAFOs) or source separated wastewaters. This study evaluated the factors that promote nitritation in membrane aerated bioreactors (MABRs) treating urine dominated wastewaters (670-4900 mg-N/L) at DO > 3 mg/L and without solids wasting. FNA concentrations > 0.2 mg-N/L and/or FA concentrations > 3 mg-N/L partially inhibit NOB similar to inhibitory concentrations observed in studies for lower strength wastewaters. FNA > 1 mg-N/L completely inhibited NOB. Direct addition of nitrite (NO2-) or pH manipulation to increase either FNA or FA can inhibit even established NOB populations, leading to stable nitritation. For urine dominated wastewaters with TN concentrations > 1000 mg /L or reactors designed to produce an effluent with ~1:1 total ammonia nitrogen (TAN) to NO2-(pre-anammox), all operating regimes (loading or pH) inhibit NOB.These results extend the applications of MABRs to treat high TN concentration, urine dominated wastewaters. MABRs are ideal for remote locations or other applications (off grid communities, CAFOs, underdeveloped countries) that cannot support complex control systems for pH or DO control and eliminate the need for solids processing.