Effect of sodium dodecyl sulfate on waste activated sludge hydrolysis and acidification
Effect of sodium dodecyl sulfate on waste activated sludge hydrolysis and acidification
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十二烷基硫酸钠对废弃活性污泥水解酸化的影响
DOI：
10.1016/j.cej.2007.01.017
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发表时间：
2007-08-01
影响因子：
15.1
通讯作者：
Zhou, Qi
中科院分区：
文献类型：
--
作者：
Jiang, Su;Chen, Yinguang;Zhou, Qi
研究了十二烷基硫酸钠(十二烷基硫酸钠)对活性污泥水解酸化的影响，这在文献中尚未见报道。结果表明，十二烷基硫酸钠提高了蛋白质和碳水化合物在水相中的溶解度，且这两种底物的浓度随着十二烷基硫酸钠用量的增加而增加。在发酵第2天，添加浓度为0.02~0.3g/g的十二烷基硫酸钠提高了产酶活性，而当添加量大于0.05和0.2g/g时，α-葡萄糖苷酶和酸性磷酸酶活力下降。在室温下，十二烷基硫酸钠还能促进挥发性脂肪酸(VFAS)的产生。发酵第6天，当十二烷基硫酸钠用量为0.1g/g时，总挥发性脂肪酸浓度为2243.04 mgCOD/L，而空白对照仅为19.11 mgCOD/L。最大VFas产量随十二烷基硫酸钠用量的增加而增加。然而，较高剂量的十二烷基硫酸钠处理需要较长的时间才能达到其自身的最大VFAS产量。对挥发性脂肪酸的组成进行了分析，发现醋酸是最常见的产物。进一步的研究表明，在十二烷基硫酸钠的存在下，产甲烷受到了抑制。加入和不加入十二烷基硫酸钠的pH变化几乎相同，说明在IS发酵中，促进VFAS的产生和抑制甲烷的产生更多地是由于十二烷基硫酸钠的影响，而不是由于pH的变化。(C)2007 Elsevier B.V.保留所有权利。
The effect of sodium dodecyl sulfate (SDS) on hydrolysis and acidification of waste activated sludge (WAS) was investigated, which has not been documented in the literature. Results showed that SDS improved the solubility of protein and carbohydrate in aqueous phase, and the concentrations of these two substrates increased with the amount of SDS. On the second day of fermentation the enzyme activities of protease and alkaline phosphatase were improved by SDS with its dosage in the range of 0.02-0.3 g/g, but the activities of a-glucosidase and acidic phosphatase decreased at SDS dosage above 0.05 and 0.2 g/g, respectively. The volatile fatty acids (VFAs) production was also enhanced by SDS under room temperature. On the sixth day of fermentation, concentration of total VFAs was 2243.04 mg COD/L at SDS dosage 0.1 g/g, while it was only 19 1. 10 mg COD/L in the blank test. The maximum VFAs production increased with the amount of SDS. However, longer time was needed for WAS treated with higher SDS dosage to reach its own maximum VFAs production. The composition of VFAs was analyzed, and acetic acid was observed the most prevalent product. Further studies showed that methanogenesis was inhibited in the presence of SDS. Almost the same pH variations in the presence and absence of SDS indicated that the improvement of VFAs production and inhibition of methane production in WAS fermentation was more due to the effects of SDS than due to the variations of pH. (c) 2007 Elsevier B.V. All rights reserved.