Jiangsu Urban and Rural Construction Vocational College, Changzhou, 213147, China.
Jiangsu University of Technology, Changzhou, 213000, China.
Environ Sci Pollut Res Int. 2022 Sep;29(45):68087-68095. doi: 10.1007/s11356-022-20619-x. Epub 2022 May 9.
Alkyl polyglycosides (APG), a biodegradable biosurfactant, have been widely used in environmental pollution control. However, the application of APG to enhance anaerobic dark fermentation of excess sludge (ES) and plant waste (PW) to improve hydrogen production has not been reported so far. In order to fill this gap, the effect of APG on hydrogen production from ES and PW was studied in mesophilic (30 °C) environment. The results showed that APG increased the yield of hydrogen, and the recommended dose was 0.15 g/g (calculated as volatile suspended solids), accompanied by 18.7 mL/g. The contribution of APG self-degradation to hydrogen can be ignored. Mechanism investigation revealed that APG promoted the dissolution, hydrolysis, and acidification of complex organic matter, and when the content of APG was 0.15 g/g, the concentration of dissolved chemical oxygen demand (COD) was as high as 3151 mg/L; however, the dissolved concentration of COD in the blank group was only 1548 mg/L. In addition, APG improved the output of volatile fatty acids (VFA). APG promoted the proportion of acetate and butyrate in VFA, which was conducive to hydrogen production. As for the process of methanogenesis, APG reduced the consumption of hydrogen and accumulates hydrogen. This work provides an alternative strategy for the recycling of organic waste and the enhanced generation of hydrogen.
烷基多糖苷（APG）是一种可生物降解的生物表面活性剂，已广泛应用于环境污染控制中。然而，将 APG 应用于增强厌氧消化剩余污泥（ES）和植物废物（PW）以提高产氢量的研究尚未见报道。为了填补这一空白，本研究在中温（30°C）环境下研究了 APG 对 ES 和 PW 产氢的影响。结果表明，APG 提高了氢气的产量，推荐剂量为 0.15 g/g（按挥发性悬浮固体计算），同时产生了 18.7 mL/g 的氢气。APG 自身降解对氢气的贡献可以忽略不计。机理研究表明，APG 促进了复杂有机物的溶解、水解和酸化，当 APG 含量为 0.15 g/g 时，溶解化学需氧量（COD）的浓度高达 3151 mg/L；而空白组的溶解 COD 浓度仅为 1548 mg/L。此外，APG 提高了挥发性脂肪酸（VFA）的产量。APG 促进了 VFA 中乙酸和丁酸的比例，有利于产氢。对于产甲烷过程，APG 减少了氢气的消耗并积累了氢气。这项工作为有机废物的回收和增强产氢提供了一种替代策略。
