Resources availability mediated EPS production regulate microbial cluster formation in activated sludge system

Zhu, Ning; Liu, Li; Qiao, Xu; Chen, Guowei; Wang, Gang

doi:10.1016/j.cej.2015.05.017

Cited by 28 publications

(1 citation statement)

References 50 publications

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“…PN and PS are the main EPS constituents, accounting for about 70-80% of the total EPS [4]. Because EPS promote adhesion and aggregation between microbial cells [5], and their content can affect the properties of flocs, such as flocculation capacity, settling performance, surface charge, and microbial community structure [6][7][8], EPS are key substances that determine the physical, chemical, and biological properties of flocs, and thus the water purification performance. Biofloc technology (BFT) is widely used in aquacultural tailwater purification.…”

Section: Introductionmentioning

confidence: 99%

C058 and Other Functional Microorganisms Promote the Synthesis of Extracellular Polymer Substances in Mycelium Biofloc

Luo

et al. 2022

Catalysts

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The mycelium biofloc bioaugmented by Cordyceps strain C058 effectively purifies water, which may be related to the synthesis of extracellular polymer substances. To verify this conjecture, we analyzed the changes in extracellular polymer substances content in the mycelium biofloc under various hydraulic retention times (36 h, 18 h, and 11 h). The microstructure and microflora composition were analyzed using a scanning electron microscope and high-throughput sequencing. The ordinary biofloc without bioaugmentation was taken as a control. The results showed that under the above hydraulic retention time, the extracellular polymer substances contents of the mycelium biofloc were 51.20, 55.89, and 33.84 mg/g, respectively, higher than that of the ordinary biofloc (14.58, 15.72, and 18.19 mg/g). The protein content or the polysaccharide content also followed the same trend. Meanwhile, the sedimentation performance of the mycelium biofloc was better than that of the ordinary biofloc, attributed to the content of the extracellular polymer substances. It is worth noting that C058 is the main biofloc content, which promotes the synthesis of extracellular polymer substances in the mycelium biofloc. Other functional microorganisms in the mycelium biofloc were Janthinobacterium, Phormidium, Leptolyngbya, Hymenobacter, and Spirotrichea, which also promote the synthesis of extracellular polymer substances.

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Section: Introductionmentioning

confidence: 99%

C058 and Other Functional Microorganisms Promote the Synthesis of Extracellular Polymer Substances in Mycelium Biofloc

Luo

et al. 2022

Catalysts

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Suspended Load Transport of Bio-sediment

Fang

Huang

Zhao

et al. 2020

Mechanics of Bio-Sediment Transport

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Three-dimensional fluorescence excitation–emission matrix (EEM) spectroscopy with regional integration analysis for assessing waste sludge hydrolysis at different pretreated temperatures

Sun

Guo

et al. 2016

Environ Sci Pollut Res

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Heat pretreatment process can promote sludge hydrolysis and enhance the degradability of waste sludge. The effect of heat pretreatment at different temperatures on the changes of soluble chemical oxygen demand (SCOD), carbohydrates, and proteins and the structural and functional properties of organics in extracellular polymeric substances (EPS) and dissolved organic matters (DOM) were systematically investigated. Heat pretreatment was conducted at 65, 80, 100, and 121 °C for 30 min. The SCOD in DOM increased with pretreated temperatures. Three-dimensional excitation-emission matrix (3D-EEM) fluorescence spectroscopy was utilized to evaluate the biodegradable and non-biodegradable components in EPS and DOM. Moreover, the humification index (HIX) and the fluorescence index (FI) were used to evaluate the humification and DOM source. At 80 °C, the percent fluorescence response (P ) of easily biodegradable soluble microbial by-product substance was higher than others; meanwhile, little non-biodegradable humic acid-like substance was accumulated. In order to enhance sludge biodegradability, 80 °C was chosen as the optimal temperature for heat pretreatment.

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Resources availability mediated EPS production regulate microbial cluster formation in activated sludge system

Cited by 28 publications

References 50 publications

C058 and Other Functional Microorganisms Promote the Synthesis of Extracellular Polymer Substances in Mycelium Biofloc

C058 and Other Functional Microorganisms Promote the Synthesis of Extracellular Polymer Substances in Mycelium Biofloc

Suspended Load Transport of Bio-sediment

Three-dimensional fluorescence excitation–emission matrix (EEM) spectroscopy with regional integration analysis for assessing waste sludge hydrolysis at different pretreated temperatures

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