Anaerobic Fluidized Bed Membrane Bioreactor with Multichanneled Biocarrier for Carbon-Neutral, Decentralized Greywater Treatment

IF 7.4 Q1 ENGINEERING, ENVIRONMENTAL ACS ES&T engineering Pub Date : 2024-09-16 DOI:10.1021/acsestengg.4c00186
Jiyun Park, Smruti Ranjan Dash, Seow Wah How, Di Wu, Jeonghwan Kim
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Abstract

This study investigated the effect of hydraulic retention times (HRTs) on the organic removal efficiency, membrane fouling, and methane production rate from an anaerobic fluidized bed membrane bioreactor (AFMBR) to treat synthetic greywater with a soluble chemical oxygen demand (SCOD) of 300 mg/L. Here, a polyvinylidene fluoride (PVDF)-based biocarrier was applied to control membrane fouling and facilitate attached biofilm growth. At an HRT of 16 h, which corresponds to 3.75 L/m2 h of permeate flux, transmembrane pressure was maintained as 0.15 bar. As the HRT decreased 12 h, the SCOD removal efficiency dropped 42% quickly while bulk volatile suspended solid (VSS) concentration increased 1300 mg/L. However, when the HRT was further reduced to 8 h, the SCOD removal stabilized at 81% gradually with reducing the bulk VSS to 300 mg/L. During the entire operational period, the biogas produced by AFMBR under the fluidization of multichanneled media consisted of 50% methane. The methane yield was 0.13 L of CH4/day at an HRT of 8 h. A 16S ribosomal ribonucleic acid analysis of the microbial community demonstrated that the relative abundance of Methanosaeta grown on the PVDF media increased as the HRT decreased. Spectroscopic observation revealed that a significant portion of biomass was grown inside media channels having higher surface roughness than their outer surfaces.

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用于碳中和、分散式灰水处理的厌氧流化床膜生物反应器与多通道生物载体
本研究调查了水力停留时间(HRTs)对厌氧流化床膜生物反应器(AFMBR)有机物去除效率、膜污垢和甲烷生产率的影响,以处理可溶性化学需氧量(SCOD)为 300 mg/L 的合成中水。在这里,应用了一种基于聚偏二氟乙烯(PVDF)的生物载体来控制膜堵塞并促进附着生物膜的生长。当 HRT 为 16 小时(相当于 3.75 升/平方米小时的渗透通量)时,跨膜压力保持为 0.15 巴。当 HRT 下降 12 小时后,SCOD 去除效率迅速下降了 42%,而体积挥发性悬浮固体(VSS)浓度增加了 1300 毫克/升。然而,当 HRT 进一步降低到 8 小时时,SCOD 去除率逐渐稳定在 81%,同时体积挥发性悬浮固体浓度降低到 300 mg/L。在整个运行期间,AFMBR 在多通道介质流化条件下产生的沼气中甲烷含量为 50%。微生物群落的 16S 核糖体核糖核酸分析表明,随着 HRT 的缩短,生长在 PVDF 培养基上的 Methanosaeta 的相对丰度增加。光谱观察显示,相当一部分生物量生长在表面粗糙度高于外表面的介质通道内。
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ACS ES&T engineering
ACS ES&T engineering ENGINEERING, ENVIRONMENTAL-
CiteScore
8.50
自引率
0.00%
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0
期刊介绍: ACS ES&T Engineering publishes impactful research and review articles across all realms of environmental technology and engineering, employing a rigorous peer-review process. As a specialized journal, it aims to provide an international platform for research and innovation, inviting contributions on materials technologies, processes, data analytics, and engineering systems that can effectively manage, protect, and remediate air, water, and soil quality, as well as treat wastes and recover resources. The journal encourages research that supports informed decision-making within complex engineered systems and is grounded in mechanistic science and analytics, describing intricate environmental engineering systems. It considers papers presenting novel advancements, spanning from laboratory discovery to field-based application. However, case or demonstration studies lacking significant scientific advancements and technological innovations are not within its scope. Contributions containing experimental and/or theoretical methods, rooted in engineering principles and integrated with knowledge from other disciplines, are welcomed.
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