添加钙预处理厌氧发酵液通过原位合成层状双氢氧化物来提高短链脂肪酸的提取。
Pretreating anaerobic fermentation liquid with calcium addition to improve short chain fatty acids extraction via in situ synthesis of layered double hydroxides.
机构信息
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
School of Environmental and Chemical Engineering, Shanghai University, 333 Nanchen Road, Shanghai 200444, China.
出版信息
Bioresour Technol. 2019 Jan;271:190-195. doi: 10.1016/j.biortech.2018.09.086. Epub 2018 Sep 17.
In situ synthesis of layered double hydroxides (LDHs) was proved to be an effective way to extract short chain fatty acids (SCFAs) from anaerobic fermentation liquid (AFL) as carbon source for biodenitrification, but the SCFAs content in SCFAs-LDH was unsatisfactory because of the existence of much carbonate in AFL. Pretreatment of AFL with calcium addition was investigated to remove carbonate and improve SCFAs extraction via LDHs synthesis. Results of batch tests showed that, the carbonate removal efficiency was as high as 76.6% when the calcium addition was 0.06 mol/L at pH 12. When using the optimal SCFAs/Al ratio of 3.0, the total SCFAs content in SCFAs-LDH with pretreatment was improved to 46.5 mg COD/g LDH, which was 4.5 times of the control (10.4 mg COD/g LDH). These results suggest that adding calcium to AFL was an effective way to eliminate the negative effect of carbonates on SCFAs-LDH synthesis.
层状双氢氧化物（LDHs）的原位合成被证明是从厌氧发酵液（AFL）中提取短链脂肪酸（SCFAs）作为生物反硝化碳源的有效方法，但由于 AFL 中存在大量碳酸盐，SCFAs-LDH 中的 SCFAs 含量并不令人满意。研究了用钙添加物对 AFL 进行预处理，以通过 LDHs 合成去除碳酸盐并提高 SCFAs 提取率。批处理试验结果表明，当 pH 值为 12 时钙添加量为 0.06mol/L 时，碳酸盐去除效率高达 76.6%。当使用最佳的 SCFAs/Al 比为 3.0 时，预处理后的 SCFAs-LDH 中的总 SCFAs 含量提高到 46.5mg COD/g LDH，是对照（10.4mg COD/g LDH）的 4.5 倍。这些结果表明，向 AFL 中添加钙是消除碳酸盐对 SCFAs-LDH 合成负面影响的有效方法。
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