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

Sequencing batch reactors (SBRs) are known for high process stability and usually have a good sludge volume index (SVI). Nevertheless, in many SBRs in Germany for municipal wastewater treatment, scum and foam problems can occur, and SVI can be larger than 200 mL/g. The microscopic investigations of the activated sludge from plants with nitrogen and phosphorus removal have shown that Microthrix parvicella is dominant in the activated sludge in most of them. Studies showed that the optimum growth of M. parvicella is performed at a high sludge age (>20 d) and low sludge load in the range of 0.05–0.2 kg of biochemical oxygen demand per kg of total suspended solids per day (kg BOD5/(TSS·d)). The investigations in 13 SBRs with simultaneous aerobic sludge stabilization (most of them are operated with a system called differential internal cycle strategy sequential batch reactor (DIC-SBR)) show that M. parvicella is able to grow in sludge loads less than 0.05 kg BOD5/(kg TSS·d) as well. To optimize the operation of those SBRs, long cycle times (8–12 h) and dosing of iron salts to eliminate long-chain fatty acids are both recommended. This leads to better SVI and keeps M. parvicella at a low frequency.

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Microalgal Dynamics in Batch Reactors for Municipal Wastewater Treatment Containing Dairy Sewage Water

Water Air & Soil Pollution ◽

10.1007/s11270-007-9598-3 ◽

2007 ◽

Vol 190 (1-4) ◽

pp. 259-270 ◽

Cited By ~ 25

Author(s):

Clementina Barrera Bernal ◽

Gabriela Vázquez ◽

Icela Barceló Quintal ◽

Anne Laure Bussy

Keyword(s):

Wastewater Treatment ◽

Municipal Wastewater ◽

Sewage Water ◽

Batch Reactors ◽

Municipal Wastewater Treatment

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Effect of magnetic powder on membrane fouling mitigation and microbial community/composition in membrane bioreactors (MBRs) for municipal wastewater treatment

Bioresource Technology ◽

10.1016/j.biortech.2017.10.027 ◽

2018 ◽

Vol 249 ◽

pp. 377-385 ◽

Cited By ~ 16

Author(s):

Yi Liu ◽

Qiang Liu ◽

Jixiang Li ◽

Huu Hao Ngo ◽

Wenshan Guo ◽

...

Keyword(s):

Wastewater Treatment ◽

Microbial Community ◽

Community Composition ◽

Membrane Fouling ◽

Municipal Wastewater ◽

Microbial Community Composition ◽

Membrane Bioreactors ◽

Magnetic Powder ◽

Municipal Wastewater Treatment ◽

Fouling Mitigation

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Kenaf addition has mixed effects on process performance of sequencing batch reactors treating municipal wastewater

Environmental Science Water Research & Technology ◽

10.1039/c7ew00548b ◽

2018 ◽

Vol 4 (5) ◽

pp. 711-720 ◽

Cited By ~ 1

Author(s):

Forrest James Hurley ◽

Xia He ◽

Ling Wang ◽

Francis L. de los Reyes III

Keyword(s):

Wastewater Treatment ◽

Municipal Wastewater ◽

Mixed Effects ◽

Batch Reactors ◽

Process Performance ◽

Sequencing Batch Reactors ◽

Mixed Liquor

The effects on wastewater treatment due to addition to the mixed liquor of a fine lignocellulosic powder made of dried kenaf were assessed using lab-scale sequencing batch reactors (SBRs) operated for over 200 days.

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