Effect of intermittent aeration cycle on nutrient removal and microbial community in a fluidized bed reactor-membrane bioreactor combo system

Nutrient removal and recovery from wastewater is being challenged to avoid eutrophication problems, and the discharge standards have also been tightened by water regulations. Therefore, this study was undertaken to recover the nutrients from both synthetic wastewater and swine wastewater in a fluidized bed reactor (FBR). The operational parameters were changed to find out the optimum conditions for struvite formation. The most suitable pH was identified around pH 9. When the molar ratio of magnesium as Mg: P was 2:1 in the FBR, the removal efficiency of NH4-N and PO4-P was 79 and 90 %, respectively. The seed material was effective to form struvite in the condition of 30 g dosage. Struvite crystallization in reaction was completed in 20 minutes. The growth of struvite crystals was confirmed by the analysis of XRD, FT-IR and TG-DTA. In addition, the struvite was successfully recovered when the optimum conditions were applied to the swine wastewater.

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Impact of intermittent aeration mode on enhancement of biological nutrient removal by the novel prototype IT/OD-MBR(Inclined Tube/Oxidation-Ditch Membrane Bioreactor) for high-rise building's wastewater recycling

International Biodeterioration & Biodegradation ◽

10.1016/j.ibiod.2017.06.005 ◽

2017 ◽

Vol 124 ◽

pp. 36-44 ◽

Cited By ~ 5

Author(s):

Chavalit Ratanatamskul ◽

Jiranthanin Kongwong

Keyword(s):

Nutrient Removal ◽

Membrane Bioreactor ◽

Biological Nutrient Removal ◽

The Novel ◽

Oxidation Ditch ◽

Intermittent Aeration ◽

High Rise ◽

Inclined Tube ◽

Wastewater Recycling

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High Biological Nutrient Removal from Domestic Wastewater in Combination with Phosphorus Recycling

Water Science & Technology ◽

10.2166/wst.1991.0515 ◽

1991 ◽

Vol 23 (4-6) ◽

pp. 651-657 ◽

Cited By ~ 4

Author(s):

J. H. Rensink ◽

E. Eggers ◽

H. J. G. W. Donker

Keyword(s):

Fluidized Bed ◽

Nutrient Removal ◽

Domestic Wastewater ◽

Fluidized Bed Reactor ◽

Biological Nutrient Removal ◽

Anoxic Zone ◽

Domestic Waste ◽

Average Value ◽

Phosphorus Recycling ◽

P Removal

Pilot plant studies on biological nutrient removal and using settled domestic waste water have been carried out in combination with phosphorus recycling on the basis of crystallisation of calcium phosphate on sand pellets in a fluidized bed-reactor. The bioreactor had been divided into four zones, respectively anaerobic, aerobic, anoxic and aerobic. To eliminate nitrate sludge recirculation for denitrification, a part of the influent was led to the anoxic zone. In the by-pass of the bioreactor a phostripper tank was incorporated followed by a fluidized bed-reactor. The experiments carried out at low F/M ratios and at a constant and variable influent flow resulted in nearly 100% P-removal. P-total effluent was lower than 0.1 mg P/l. The total nitrogen content in the effluent amounted to an average value of approximately 16 mg N/l.

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