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摘要: 通过枯草芽孢杆菌发酵得到γ-聚谷氨酸（γ-PGA）,并采用静态阻垢法评价γ-PGA的阻垢性能.研究了温度、pH值、Ca2+浓度、γ-PGA分子量以及γ-PGA浓度对于该阻垢性能的影响,并对其阻垢产物进行结构表征以及对阻垢原理进行初步分析.研究结果表明,γ-PGA大分子和小分子均具有较强的阻垢作用,而小分子具有比大分子更加优良的阻垢特性.在阻CaSO4垢和阻CaCO3垢实验中,达到100%阻垢率时,小分子γ-PGA的最低浓度分别为4 mg/L和2 mg/L,而在相同条件下大分子γ-PGA的最低浓度均为20 mg/L.Abstract: Poly-γ-glutamic acid (γ-PGA) produced by fermentation of Bacillus sp was studied as a potential novel green scale inhibitor. The effects of γ-PGA concentration, molecular weight of γ-PGA, temperature, pH and Ca2+concentration on the scale inhibiting rate of γ-PGA were respectively analyzed using static anti-scaling method, and the structural characterization of scale inhibiting products and possible mechanism were investigated. The results reveal that both large molecular γ-PGA and small molecular γ-PGA have inhibiting efficiency. More specifically, small molecular γPGA shows the better inhibiting efficiency with their lowest concentration to get 100% inhibiting efficiency from scale of CaSO4 and CaCO3 being 4 mg/L and 2 mg/L respectively, while large molecular γ-PGA to get the same efficiency in the same condition is 20 mg/L respectively.
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