Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Department of Environmental Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
Sci Total Environ. 2022 Mar 25;814:152497. doi: 10.1016/j.scitotenv.2021.152497. Epub 2021 Dec 27.
The Maillard reaction (MR) occurs during the alkaline thermal hydrolysis (ATH) of sludge, which affects the quantity and quality of recovered protein. In this paper, four different sulfites were added to investigate their inhibitory effects on melanoidin production. The results showed that sulfites inhibited melanoidin production during ATH of sludge and the inhibitory rate increased with their concentration. At a concentration of 5.71 g/L, the inhibitory rates of NaHSO on melanoidin were 63.27%. Furthermore, the 3D-EEM (Three-Dimension Excitation-Emission-Matrix) fluorescence spectroscopy and protein testing data showed that the inhibition of melanoidin production was accompanied by an increased protein concentration, and protein increased with increasing sulfites concentration. A 2.5-fold increase in protein concentration with NaSO significantly enhanced the quantity of protein recovered. Therefore, the addition of sulfite during ATH of sludge reduces the amount of non-biodegradable melanoidin, which in turn benefits protein recovery.
美拉德反应（MR）在污泥的碱性热水解（ATH）过程中发生，影响回收蛋白质的数量和质量。本文添加了四种不同的亚硫酸盐来研究它们对类黑精生成的抑制作用。结果表明，亚硫酸盐抑制了污泥 ATH 过程中的类黑精生成，其抑制率随浓度的增加而增加。在 5.71g/L 的浓度下，NaHSO 对类黑精的抑制率为 63.27%。此外，3D-EEM（三维激发-发射矩阵）荧光光谱和蛋白质测试数据表明，类黑精生成的抑制伴随着蛋白质浓度的增加，并且随着亚硫酸盐浓度的增加而增加。亚硫酸钠浓度增加 2.5 倍，显著提高了蛋白质的回收量。因此，在污泥 ATH 过程中添加亚硫酸盐可以减少不可生物降解的类黑精的量，从而有利于蛋白质的回收。
