Forced ammonia stripping from livestock wastewater: the influence of some physico-chemical parameters of the wastewater.
Forced ammonia stripping from livestock wastewater: the influence of some physico-chemical parameters of the wastewater.
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DOI：
10.2166/wst.2016.552
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发表时间：
2017-02
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影响因子：
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通讯作者：
G. Markou;Miranda Agriomallou;Dimitris Georgakakis
中科院分区：
文献类型：
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作者：
G. Markou;Miranda Agriomallou;Dimitris Georgakakis
在高碱性水溶液（pH>10）中，溶解的氨氮的主要形式是未电离的游离氨。游离氨是一种气态分子，很容易从溶液中分离出来。经常使用提高废水 pH 值来强制去除氨。在此，研究了液体牛废水的一些物理化学特性的变化对氨汽提的影响。结果表明，在 pH 11.5 时，氨挥发及其通过汽提的去除不受总固体量 (1-10%)、碱度 (2,500-20,000 mg/L 以 CaCO3 计) 和电导率 (20-50 mS/cm) 变化的影响，也不受用于提高 pH 值的碱类型（NaOH、KOH 和 Ca(OH)2）的影响。影响氨汽提率的唯一参数是垫料浓度的变化（秸秆0.5-5%）。结果表明，在高 pH 下强制氨汽提速率的过程不受影响，并且不受任何研究参数变化的限制，除了垫层材料。对照实验（未增加pH的原废水）的氨汽提传质模型的参数kOLa（1/min）约为。 0.0002，而通过增加 pH 值，它增加了 20 倍以上（0.004 至 0.0045）。
In highly alkaline aqueous solutions (pH >10), the main form of dissolved ammoniacal nitrogen is the unionized free ammonia. Free ammonia, being a gaseous molecule, is easily stripped out from the solution. Increasing wastewater pH is frequently used to force ammonia removal. Herein, the effect of the variation of some physico-chemical characteristics of liquid cattle wastewater on ammonia stripping was investigated. The results show that at pH 11.5, ammonia volatilization and consequently its removal through stripping, was not affected by the variation of total solids (1-10%), alkalinity (2,500-20,000 mg/L as CaCO3) and electrical conductivity (20-50 mS/cm), or by the alkali type (NaOH, KOH and Ca(OH)2) employed to increase pH. The only parameter which affected ammonia stripping rate was the variation of the concentration of bedding material (straw 0.5-5%). The results suggest that the process of forcing ammonia stripping rate at high pH is unaffected and is not limited by the variation of any of the investigated parameters, except bedding material. The parameter kOLa (1/min) of the mass transfer model of ammonia stripping regarding the control experiments (raw wastewater without increasing pH) was ca. 0.0002, while by increasing pH it increased more than 20-fold (0.004 to 0.0045).