State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China.
School of Civil and Environmental Engineering, Centre for Technology in Water and Wastewater, University of Technology Sydney, Sydney, NSW 2007, Australia.
Bioresour Technol. 2022 Feb;346:126655. doi: 10.1016/j.biortech.2021.126655. Epub 2021 Dec 31.
This work put up a novel strategy of applying calcium peroxide (CaO) in aerobic sludge digestion and provided insights into such system. The degradation percentage of sludge and total inorganic nitrogen production in the digesters with CaO at 0.02 g/g-VS-WAS increased by 25.8% and 18.8% of control. CaO addition allowed various key microbes related to organics degradation to accumulate in the system. Moreover, the modelling and chemical (i.e., excitation emission matrix (EEM) fluorescence and fourier transformation spectroscopy (FTIR)) analyses revealed that CaO addition enhanced sludge biodegradability with more release of biodegradable organics and increased degradation of recalcitrant organics, which can be transformed into biodegradable organics with the action of CaO. Subsequent transformation test indicated that CaO enabled to promote hydrolysis and catabolism of biodegradable substrates in sludge. Further investigations on function mechanism suggested that CaO carried on positive action for sludge aerobic digestion mainly through the enhancement by ·OH.
这项工作提出了一种将过氧化钙 (CaO) 应用于好氧污泥消化的新策略，并为该系统提供了深入了解。在投加 0.02 g/g-VS-WAS 的 CaO 的消化器中，污泥的降解率和总无机氮的生成分别比对照组提高了 25.8%和 18.8%。CaO 的添加使与有机物降解相关的各种关键微生物在系统中积累。此外，模型和化学分析（即激发发射矩阵（EEM）荧光和傅里叶变换光谱（FTIR））表明，CaO 可提高污泥的生物降解性，释放更多可生物降解的有机物，并增加难生物降解有机物的降解，这些有机物可在 CaO 的作用下转化为可生物降解的有机物。随后的转化试验表明，CaO 可以促进污泥中可生物降解基质的水解和分解代谢。对作用机制的进一步研究表明，CaO 主要通过增强·OH 对污泥好氧消化产生积极作用。
