Assessing the impact of increasing phenol loads on the performance and stability of an aerobic granular sludge system

苯酚 曝气 化学 序批式反应器 有机质 沉淀 制浆造纸工业 废水 活性污泥 强化生物除磷 无氧运动 生物降解 色谱法 环境工程 有机化学 环境科学 生物 工程类 生理学
作者
A. J. F. Nunes,José Sebastião dos Santos,Isabelli Dias Bassin,Márcia Dezotti,João Paulo Bassin
出处
期刊:Biochemical Engineering Journal [Elsevier]
卷期号:198: 108997-108997 被引量:2
标识
DOI:10.1016/j.bej.2023.108997
摘要

This work evaluated the impact of phenol on the performance and stability of an aerobic granular sludge (AGS) sequencing batch reactor (SBR) operated under alternating anaerobic-aerobic conditions for simultaneous organic matter, nitrogen, and phosphorus removal. The reactor was fed with synthetic wastewater whose phenol concentration was gradually increased from 2 to 200 mg L−1, while the other carbon source (acetate) was reduced proportionally to keep the organic loading rate invariable. Up to 20 mg L−1 of phenol, the average COD removal was above 90%, while practically full ammonium, phosphorus, and phenol removal was achieved. However, at higher phenol concentrations, the activity of polyphosphate-accumulating organisms and nitrifiers was affected. Although the overall COD removal was only slightly affected by increasing phenol loads, replacing the main carbon source from acetate to phenol changed the organic matter removal profile over the cycle, with the latter being converted mainly within the aerated stage of the SBR. As a result, there was filamentous growth that deteriorated the settling properties of the granules. The establishment of an anaerobic feast-aerobic famine regime over the non-aerated and aerated phases of the AGS SBR and the presence of a readily biodegradable substrate (such as acetate) proved to be crucial for maintaining granules stability. Having phenol as the sole organic carbon source led to complete process failure regarding nutrient removal capability.
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