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METHODS article

Front. Microbiol.
Sec. Microbiotechnology
Volume 15 - 2024 | doi: 10.3389/fmicb.2024.1386557
This article is part of the Research Topic Aerobic Granular Sludge Technology and Recycling Technology of Waste Activated Sludge View all 3 articles

Dewatering Performance of Aerobic Granular Sludge under Centrifugal with Different Sludge Conditioning Agent

Provisionally accepted
Ailan Yan Ailan Yan 1*Ailan Yan Ailan Yan 2Ting Ma Ting Ma 3Yiting Qi Yiting Qi 1Dong Xu Dong Xu 1
  • 1 School of Water Conservancy and Environmental Engineering, Zhejiang University of Water Resource and Electric Power, Hangzhou, China
  • 2 Other, Hangzhou, China
  • 3 China Railway 12th Bureau Group Co., Ltd, Taiyuan, Shanxi Province, China

The final, formatted version of the article will be published soon.

    The aerobic granular sludge(AGS) technology draw scientific researchers attention, and more and more scientific research focuses on it, due to its superior advantages, such as good settling performance, high biological phase, high toxicity resistance and multiple biological effects. With the rapid development of AGS technology, a considerable amount of residual AGS will be produced, and dehydration is the biggest bottleneck of sludge reduction. This study investigated the dewatering process and method of residual AGS cultured by continuous flow experiment. Experiments were conducted using centrifugal dewatering technology with a dosing scheme to analyze the granular sludge dewatering process, and investigate the release process of EPS component in AGS dewatering. Our results implied the specific resistance of AGS has a very low value ((1.82±0.03)×10 9 m/kg) and it was not obvious for the conditioning effect of chemical conditioner on AGS dewatering. However, the moisture content can be reduced to 63.5% after dewatering with the presence of inorganic substances. The addition of drinking water treatment plant sludge (Alum sludge) can improve the efficiency of the dewatering of AGS. A possible dewatering process of AGS dewatering was proposed which was divided into two stages: First, a considerable amount of free water in the sludge was quickly removed under the action of gravity without pressure filtration. Second, the bound water release required cooperation between applying centrifugal or pressing force to grind granular cells and separate protein-like substances with the inorganic matter inside the granular sludge. The possible mechanism of AGS dewatering and hypothesis dewatering process are useful to optimize the AGS dewatering process.

    Keywords: Aerobic granular sludge(AGS), Dewatering performance, dewatering conditioner, Alum sludge, dewatering mechanism model

    Received: 15 Feb 2024; Accepted: 29 Apr 2024.

    Copyright: © 2024 Yan, Yan, Ma, Qi and Xu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Ailan Yan, School of Water Conservancy and Environmental Engineering, Zhejiang University of Water Resource and Electric Power, Hangzhou, China

    Disclaimer: All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article or claim that may be made by its manufacturer is not guaranteed or endorsed by the publisher.