New insights into multi-strategies of sludge granulation in up-flow anaerobic sludge blanket reactors from community succession and interaction

Xiao, Yeyuan; Wang, Xucai; Wang, Pei-Ling; Zhou, Zhongbo; Wang, Hui; Teng, Tao; Li, Yiwei; Yang, Lei

doi:10.1016/j.biortech.2023.128935

Cited by 6 publications

(3 citation statements)

References 46 publications

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“…Hence, contrary to the prokaryotic community, the decrease in edge density reveals that the eukaryotic community turned simpler and more specialized during the granular stage (Xiao et al, 2023). This simplification was also observed in the fewer co-occurrences between the Euk-2 and Prok-2 sub-communities in the bipartite network (79) compared with the Euk-1 and Prok-2 (178).…”

Section: Discussionmentioning

confidence: 99%

Community successional patterns and inter-kingdom interactions during granular biofilm development

de Celis,

Modin,

Arregui

et al. 2024

Preprint

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Aerobic granular sludge is a compact and efficient biofilm process used for wastewater treatment which has received much attention and is currently being implemented worldwide. The microbial associations and their ecological implications occurring during granule development, especially those involving inter-kingdom interactions, are poorly understood. In this work, we monitored the prokaryote and eukaryote community composition and structure during the granulation of activated sludge for 343 days in a sequencing batch reactor (SBR), and investigated the influence of abiotic and biotic factors on the granule development. Sludge granulation was accomplished with low-wash out dynamics at long settling times, allowing for the microbial communities to adapt to the SBR environmental conditions. The sludge granulation and associated changes in microbial community structure could be divided into three stages: floccular, intermediate, and granular. The eukaryotic and prokaryotic communities showed parallel successional dynamics, with three main sub-communities identified for each kingdom, dominating in each stage of sludge granulation. Although inter-kingdom interactions were shown to affect community succession during the whole experiment, during granule development random factors like the availability of settlement sites or drift acquired increasing importance. The prokaryotic community was more affected by deterministic factors, including reactor conditions, while the eukaryotic community was to a larger extent shaped by biotic interactions (including inter-kingdom interactions) and stochasticity.

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Section: Discussionmentioning

confidence: 99%

Community successional patterns and inter-kingdom interactions during granular biofilm development

de Celis,

Modin,

Arregui

et al. 2024

Preprint

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show abstract

“…The cell clusters then bind together by the interaction of their own secreted extracellular substances to compose a larger sludge granule. 36 The sludge granule mainly consists of cell clusters and extracellular polymer substance (EPS), which is a stratified aggregation structure that can contain large amounts of water. Through the synthesis sequence and the formation process of sludge, the spatial construction and the initial model of sludge granules were deduced.…”

Section: Basic Properties and Structure Of Sludgementioning

confidence: 99%

“…Bacteria in sewage will gather through the hydrophobic attraction effect, forming a diameter of 100–200 μm cell cluster (or bacterial colony). The cell clusters then bind together by the interaction of their own secreted extracellular substances to compose a larger sludge granule . The sludge granule mainly consists of cell clusters and extracellular polymer substance (EPS), which is a stratified aggregation structure that can contain large amounts of water.…”

Section: Basic Properties and Structure Of Sludgementioning

confidence: 99%

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Jiang

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Municipal sludge is an inevitable byproduct during the treatment of wastewater, which is produced by sewage treatment plants in urban residential areas, and it contains pathogens, heavy metals, and other pollutants. Municipal sludge is suitable for application in energy utilization because of its high organic content and relatively low toxic matter. The high moisture content of municipal sludge brings huge difficulties to its harmless disposal and resource utilization. At present, the main method used for sludge dehydration is mechanical dewatering. However, the mud cake produced by this method still has a water content of up to 80%, which does not meet the current rigorous requirements. Therefore, the development of deep dehydration technology for sludge is imperative. In this paper, the basic properties and structure of sludge were summarized. As a key component of sludge flocs, extracellular polymeric substance (EPS) has received much attention in sludge dewatering conditioning. Meanwhile, the influencing factors of sludge dewatering were also fully elaborated, including sludge types, sewage hardness, surface charge, size distribution, and sludge viscosity. And the main methods of sludge dewatering treatment were comprehensively included, namely, the physical method, chemical method, biological method, and combined conditioning methods. The advantages and disadvantages of each method are mentioned, and their application situations were analyzed. Furthermore, comment was provided on the conditioning mechanism, adaptability, prospects, and limitations of the techniques for improving sludge dewatering. This systematic review related to sludge dewatering can not only provide reference information for the conditioning method but also benefit the exploitation of efficient and ecofriendly sludge dewatering technology.

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Roles and regulation of quorum sensing in anaerobic granular sludge: Research status, challenges, and perspectives

Chen

Liu

et al. 2023

Bioresource Technology

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New insights into multi-strategies of sludge granulation in up-flow anaerobic sludge blanket reactors from community succession and interaction

Cited by 6 publications

References 46 publications

Community successional patterns and inter-kingdom interactions during granular biofilm development

Community successional patterns and inter-kingdom interactions during granular biofilm development

Dehydration Performance of Municipal Sludge and Its Dewatering Conditioning Methods: A Review

Roles and regulation of quorum sensing in anaerobic granular sludge: Research status, challenges, and perspectives

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