Nutrient removal by duckweed from anaerobically treated swine wastewater in lab-scale stabilization ponds in Vietnam

This study examined the feasibility of using non-sterilized swine wastewater for lipid production by an isolated microalga, Scenedesmus rubescens. Different dilution ratios using municipal wastewater as a diluent were tested to determine the suitable levels of microalgal growth in the wastewaters, its nutrient removal, and its lipid production. The highest lipid productivity (8.37 mg/L/d) and NH4+ removal (76.49%) were achieved in swine wastewater that had been diluted to 30 times using municipal wastewater. Various bacteria coexisted in the wastewaters during the cultivation of S. rubescens. These results suggest the practical feasibility of a system to produce lipids from swine wastewater by using microalgae.

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Phytoremediation of anaerobically digested swine wastewater contaminated by oxytetracycline via Lemna aequinoctialis: Nutrient removal, growth characteristics and degradation pathways

Bioresource Technology ◽

10.1016/j.biortech.2019.121853 ◽

2019 ◽

Vol 291 ◽

pp. 121853 ◽

Cited By ~ 21

Author(s):

Hao Hu ◽

Qi Zhou ◽

Xiang Li ◽

Wei Lou ◽

Cheng Du ◽

...

Keyword(s):

Nutrient Removal ◽

Growth Characteristics ◽

Swine Wastewater ◽

Degradation Pathways

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Nutrients Recovery by Struvite Formation from Wastewater in a Fluidized Bed Reactor

Materials Science Forum ◽

10.4028/www.scientific.net/msf.486-487.387 ◽

2005 ◽

Vol 486-487 ◽

pp. 387-390 ◽

Cited By ~ 3

Author(s):

Chan Won Lee ◽

H.B Kwon ◽

Young Jin Kim ◽

Hong Pyo Jeon

Keyword(s):

Fluidized Bed ◽

Nutrient Removal ◽

Fluidized Bed Reactor ◽

Swine Wastewater ◽

Synthetic Wastewater ◽

Molar Ratio ◽

Optimum Conditions ◽

Operational Parameters ◽

Ft Ir ◽

Removal And Recovery

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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