Response to shock load of titanium dioxide nanoparticles on aerobic granular sludge and algal-bacterial granular sludge processes

IF 4.7 3区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES NanoImpact Pub Date : 2024-10-01 DOI:10.1016/j.impact.2024.100532
Alfonz Kedves , Çağdaş Yavuz , Orsolya Kedves , Henrik Haspel , Zoltán Kónya
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Abstract

Titanium dioxide nanoparticles (TiO2 NPs) are extensively used in various fields and can consequently be detected in wastewater, making it necessary to study their potential impacts on biological wastewater treatment processes. In this study, the shock-load impacts of TiO2 NPs were investigated at concentrations ranging between 1 and 200 mg L−1 on nutrient removal, extracellular polymeric substances (EPSs), microbial activity in aerobic granular sludge (AGS), and algal-bacterial granular sludge (AB-AGS) bioreactors. The results indicated that low concentration (≤10 mg L−1) TiO2 NPs had no effect on microbial activity or the removal of chemical oxygen demand (COD), nitrogen, and phosphorus, due to the increased production of extracellular polymeric substances (EPSs) in the sludge. In contrast, the performance of both AGS and AB-AGS bioreactors gradually deteriorated as the concentration of TiO2 NPs in the influent increased to 50, 100, and 200 mg L−1. Specifically, the ammonia‑nitrogen removal rate in AGS decreased from 99.9 % to 88.6 %, while in AB-AGS it dropped to 91.3 % at 200 mg L−1 TiO2 NPs. Furthermore, the nitrate‑nitrogen levels remained stable in AB-AGS, while NO3-N was detected in the effluent of AGS at 100 and 200 mg L−1. Microbial activities change similarly as smaller decrease in the specific ammonia uptake rate (SAUR) and specific nitrate uptake rate (SNUR) was found in AB-AGS compared to those in AGS. Overall, the algal-bacterial sludge exhibited higher resilience against TiO2 NPs, which was attributed to a) higher EPS volume, b) smaller decrease in LB-EPS, and c) the favorable protein to polysaccharide (PN/PS) ratio. This in turn, along with the symbiotic relationship between the algae and bacteria, mitigates the toxic effects of nanoparticles.
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二氧化钛纳米颗粒对好氧颗粒污泥和藻菌颗粒污泥工艺的冲击负荷响应。
二氧化钛纳米粒子(TiO2 NPs)被广泛应用于各个领域,因此可以在废水中检测到,因此有必要研究其对生物废水处理过程的潜在影响。本研究调查了 TiO2 NPs 在 1 至 200 mg L-1 浓度范围内对好氧颗粒污泥(AGS)和藻类-细菌颗粒污泥(AB-AGS)生物反应器中营养物去除、胞外聚合物物质(EPSs)和微生物活性的冲击负荷影响。结果表明,低浓度(≤10 mg L-1)TiO2 NPs 对微生物活性和化学需氧量(COD)、氮和磷的去除率没有影响,原因是污泥中细胞外聚合物物质(EPSs)的产量增加。相反,当进水中 TiO2 NPs 的浓度增加到 50、100 和 200 mg L-1 时,AGS 和 AB-AGS 生物反应器的性能逐渐恶化。具体而言,AGS 的氨氮去除率从 99.9% 降至 88.6%,而 AB-AGS 的氨氮去除率在 TiO2 NPs 浓度为 200 mg L-1 时降至 91.3%。此外,AB-AGS 中的硝态氮水平保持稳定,而 AGS 在 100 和 200 mg L-1 时的出水中检测到了 NO3-N。微生物活动也发生了类似的变化,与 AGS 相比,AB-AGS 的特定氨吸收率(SAUR)和特定硝酸盐吸收率(SNUR)的下降幅度较小。总体而言,藻类-细菌污泥对 TiO2 NPs 具有更高的抗逆性,这归因于:a)更高的 EPS 量;b)更小的 LB-EPS 减少量;c)有利的蛋白质与多糖(PN/PS)比率。这反过来又与藻类和细菌之间的共生关系一起减轻了纳米粒子的毒性效应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
NanoImpact
NanoImpact Social Sciences-Safety Research
CiteScore
11.00
自引率
6.10%
发文量
69
审稿时长
23 days
期刊介绍: NanoImpact is a multidisciplinary journal that focuses on nanosafety research and areas related to the impacts of manufactured nanomaterials on human and environmental systems and the behavior of nanomaterials in these systems.
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