Landfill Leachate and Coagulants Addition Effects on Membrane Bioreactor Mixed Liquor: Filterability, Fouling, and Pollutant Removal.

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL Membranes Pub Date : 2024-10-02 DOI:10.3390/membranes14100212
Rodrigo Almeria Ragio, Ana Carolina Santana, Eduardo Lucas Subtil
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Abstract

Urban wastewater (UWW) and landfill leachate (LL) co-treatment using membrane bioreactors (MBRs) is a valuable method for managing LL in cities. Coagulants can enhance the filterability of mixed liquor (ML), but the assessment of fouling is still needed. This research aimed to investigate the effects of co-treating synthetic wastewater (SWW) and real LL on an MBR, as well as the impact of adding poly-aluminum chloride (PACl) and Tanfloc SG. Cell-ultrafiltration experiments were conducted with four different feeds: synthetic wastewater, co-treatment with LL (20% v/v), and co-treatment with the addition of 30 mg L-1 coagulants (either PACl or Tanfloc). Co-treatment aggravated flux loss and reduced the recovery rate; however, Tanfloc and PACl improved recovery after cleaning (by 11% and 9%, respectively). Co-treatment also increased cake and irrecoverable/irremovable inorganic resistances, though coagulants reduced the latter, despite a lower fit of the Hermia models during the first hour of filtration. Co-treatment reduced the removal efficiencies of almost all pollutants analyzed, with the most significant impacts observed on the organic fraction. Coagulants, particularly Tanfloc, enhanced overall performance by improving flux recovery and reducing irreversibility, thus benefiting membrane lifespan. In conclusion, Tanfloc addition yielded the best results in terms of filterability and pollutant removal.

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垃圾填埋场渗滤液和混凝剂添加对膜生物反应器混合液的影响:过滤性、污垢和污染物去除。
使用膜生物反应器(MBRs)对城市污水(UWW)和垃圾填埋场渗滤液(LL)进行协同处理,是管理城市垃圾填埋场渗滤液的重要方法。混凝剂可以提高混合液(ML)的可过滤性,但仍需要对污垢进行评估。本研究旨在调查合成废水(SWW)和实际 LL 对 MBR 的协同处理效果,以及添加聚合氯化铝(PACl)和 Tanfloc SG 的影响。使用四种不同的进料进行了细胞超滤实验:合成废水、与 LL(20% v/v)共处理以及添加 30 mg L-1 混凝剂(PACl 或 Tanfloc)的共处理。协同处理加剧了通量损失,降低了回收率;然而,Tanfloc 和 PACl 提高了清洗后的回收率(分别提高了 11% 和 9%)。共处理还增加了滤饼和不可回收/不可去除的无机阻力,尽管混凝剂降低了后者,但在过滤的第一小时内,Hermia 模型的拟合度较低。协同处理降低了几乎所有分析污染物的去除率,对有机物的影响最为显著。混凝剂,尤其是 Tanfloc,通过改善通量恢复和降低不可逆性,提高了整体性能,从而延长了膜的使用寿命。总之,添加 Tanfloc 在过滤性和污染物去除方面产生了最佳效果。
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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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