Feasibility of a return-sludge nursery concept for mainstream anammox biostimulation: Creating optimal conditions for anammox to recover and grow in a parallel tank

Zhu, Weiqiang; Tendeloo, Michiel Van; Alloul, Abbas; Vlaeminck, Siegfried E.

doi:10.1016/j.biortech.2023.129359

Cited by 2 publications

(2 citation statements)

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“…Notably, AnMBR permeate, with 457 mg/L total nitrogen concentration and a temperature of 37 °C, was better suited to stable PN/A process compared to mainstream conditions (29.1 mg/L NH 4 + –N, 10–25 °C). , The nitrogen content of permeate accounted for 44.8 and 9% of the total nitrogen in the Fe-PS and influent municipal wastewater, respectively (Figures d and ). Previous studies have indicated that biostimulation of anammox at favorably high temperatures and nitrogen loading rate can facilitate mainstream PN/A . According to the current nitrogen flow direction (ratio of 8.9:1), by exchanging the mainstream and sidestream sludge from the PN/A, the prerequisites for the stable operation of the mainstream PN/A are valid.…”

Section: Resultsmentioning

confidence: 99%

“…Previous studies have indicated that biostimulation of anammox at favorably high temperatures and nitrogen loading rate can facilitate mainstream PN/A. 43 According to the current nitrogen flow direction (ratio of 8.9:1), by exchanging the mainstream and sidestream sludge from the PN/A, the prerequisites for the stable operation of the mainstream PN/A are valid.…”

Section: Materials Flow and Elemental Transformation In Anmbrmentioning

confidence: 99%

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Iron Recycle-Driven Organic Capture and Sidestream Anaerobic Membrane Bioreactor for Revolutionizing Bioenergy Generation in Municipal Wastewater Treatment

Ye,

Zhu,

Liu

et al. 2024

Environ. Sci. Technol.

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The practicality of intensifying organic matter capture for bioenergy recovery to achieve energy-neutral municipal wastewater treatment is hindered by the lack of sustainable methods. This study developed innovative processes integrating iron recycle-driven organic capture with a sidestream anaerobic membrane bioreactor (AnMBR). Iron-assisted chemically enhanced primary treatment achieved elemental redirection with 75.2% of chemical oxygen demand (COD), 20.2% of nitrogen, and 97.4% of phosphorus captured into the sidestream process as iron-enhanced primary sludge (Fe-PS). A stable and efficient biomethanation of Fe-PS was obtained in AnMBR with a high methane yield of 224 mL/g COD. Consequently, 64.1% of the COD in Fe-PS and 48.2% of the COD in municipal wastewater were converted into bioenergy. The acidification of anaerobically digested sludge at pH = 2 achieved a high iron release efficiency of 96.1% and a sludge reduction of 29.3% in total suspended solids. Ultimately, 87.4% of iron was recycled for coagulant reuse, resulting in a theoretical 70% reduction in chemical costs. The novel system evaluation exhibited a 75.2% improvement in bioenergy recovery and an 83.3% enhancement in net energy compared to the conventional system (primary sedimentation and anaerobic digestion). This self-reliant and novel process can be applied in municipal wastewater treatment to advance energy neutrality at a lower cost.

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Section: Resultsmentioning

confidence: 99%

Section: Materials Flow and Elemental Transformation In Anmbrmentioning

confidence: 99%