Abstract:
Reverse osmosis (RO) plays a pivotal role in shale gas wastewater resource utilization. However, managing the reverse osmosis concentrate (ROC) characterized by high salinity and increased concentrations of organic matter is challenging. In this study, we aimed to elucidate the enhancement effects and mechanisms of pre-ozonation on organic matter removal efficacy in ROC using a biological activated carbon (BAC) system. Our findings revealed that during the stable operation phase, the ozonation (O3 and O3/granular activated carbon)-BAC system removes 43.6-72.2 % of dissolved organic carbon, achieving a 4-7 fold increase in efficiency compared with that in the BAC system alone. Through dynamic analysis of influent and effluent water quality, biofilm performance, and microbial community structure, succession, and function prediction, we elucidated the following primary enhancement mechanisms: 1) pre-ozonation significantly enhances the biodegradability of ROC by 4.5-6 times and diminishes the organic load on the BAC system; 2) pre-ozonation facilitates the selective enrichment of microbes capable of degrading organic compounds in the BAC system, thereby enhancing the biodegradation capacity and stability of the microbial community; and 3) pre-ozonation accelerates the regeneration rate of the granular activated carbon adsorption sites. Collectively, our findings provide valuable insights into treating ROC through pre-oxidation combined with biotreatment.
摘要:
反渗透(RO)在页岩气废水资源化利用中起着举足轻重的作用。然而,管理具有高盐度和有机物浓度增加的反渗透浓缩物(ROC)具有挑战性。在这项研究中,我们旨在阐明使用生物活性炭(BAC)系统对ROC中预臭氧化对有机物去除功效的增强作用和机制。我们的研究结果表明,在稳定运行阶段,臭氧化(O3和O3/颗粒活性炭)-BAC系统可去除43.6-72.2%的溶解有机碳,与单独的BAC系统相比,效率提高了4-7倍。通过对进水和出水水质的动态分析,生物膜性能,和微生物群落结构,继承,和函数预测,我们阐明了以下主要增强机制:1)预臭氧化显着提高了ROC的生物降解性4.5-6倍,并减少了BAC系统的有机负荷;2)预臭氧化促进了能够降解BAC系统中有机化合物的微生物的选择性富集,从而增强微生物群落的生物降解能力和稳定性;和3)预臭氧化加速颗粒活性炭吸附位点的再生速率。总的来说,我们的发现为通过预氧化结合生物处理来处理ROC提供了有价值的见解。