Use of magnetic powder to effectively improve the performance of sequencing batch reactors (SBRs) in municipal wastewater treatment

Abstract

This study aims to investigate the effect of adding magnetic powder in the sequencing batch reactor (SBR) on the reactor performance and microbial community. Results indicated that, the magnetic activated sludge sequencing batch reactor (MAS-SBR) had 7.76% and 4.76% higher ammonia nitrogen (NH-N) and chemical oxygen demand (COD) removal efficiencies than that of the conventional SBR (C-SBR). The MAS-SBR also achieved 6.86% sludge reduction compared with the C-SBR. High-throughput sequencing demonstrated that the dominant phyla of both SBRs (present as ≥1% of the sequence reads) were Protebacteria, Bacteroidetes, Chloroflexi, Saccharibacteria, Chlorobi, Firmicutes, Actinobactoria, Acidobacteria, Planctomycetes and unclassified_Bacteria. The relative abundance of Protebacteria and Bacteroidetes simultaneously declined whereas the other 8 phyla increased following the addition of magnetic powder. Adding magnetic powder in the SBR significantly affected the microbial diversity and richness of activated sludge, consequently affecting the reactor performance.

Submicron magnetite enhanced simultaneous denitrification and degradation of phenol and quinoline

“…近年来, 磁铁矿因廉价易得, 且具备良好的导电性 和磁性, 被逐渐应用于废水生物处理领域 [9] . 研究发现 导电性磁铁矿能加速微生物直接种间电子传递(direct interspecies electron transfer, DIET) [10] , 并促进相关酶活 性和微生物生长, 从而提高污染物的去除效率.…”

Atıksu Arıtma Tesislerinde Arıtma Çamurları ve Bertaraf Uygulamaları

“…(2018) yapmış oldukları çalışmada seri kesikli biyogaz reaktörüne manyetik toz eklenmesinin reaktör performansı ve mikrobiyolojik topluluk üzerindeki etkisini araştırmışlardır. Çalışma sonucunda manyetik aktive edilmiş çamur sekanslı parti reaktörünün geleneksel seri kesikli biyogaz reaktöründen daha yüksek amonyak azotu ve kimyasal oksijen ihtiyacı giderim verimine sahip olduğunu göstermiştir [13].…”

Comparison of the elimination effectiveness of tetracycline and AmpC β-lactamase resistance genes in a municipal wastewater treatment plant using four parallel processes

“…The UNITANK process is an improvement of the sequencing batch reactor (SBR), in which wastewater is added to a single batch reactor and returning sludge is eliminated (Bashiri et al 2018). However, it is prone to sludge deposition (Liu et al 2018), which easily causes ARGs from wastewater to be transferred into sludge in both the AB and UNITANK processes. Higher amounts of some ARGs were detected during the pretreatment process, including influent and primary sedimentation in AAO, but decreased gradually via sequential treatment processes (Lee et al 2017).…”