Nutrient removal and greenhouse gas emissions in duckweed treatment ponds

Sims, Atreyee; Gajaraj, Shashikanth; Hu, Zhiqiang

doi:10.1016/j.watres.2012.12.009

Cited by 46 publications

(18 citation statements)

References 76 publications

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“…An average ratio of NH 4 + -N/PO 4 -3 -P uptake was 6.7 which is in agreement with most published data, where this ratio ranges from 2.5 to 10.0, with the majority reported around 7.0 [10,17,20,38,40]. Reduction in concentrations of both nutrients led to minor decreases in the growth rates of duckweed, 5.4 to 4.3 g dw/m 2 -day for 10 to 2.5% ADSW, respectively, but this effect was diminished in 1.2% ADSW (3.3 g dw/m 2 -day), in agreement with an early finding [20].…”

Section: Resultssupporting

confidence: 91%

Dual application of duckweed and azolla plants for wastewater treatment and renewable fuels and petrochemicals production

Muradov

Taha

Miranda

et al. 2014

Biotechnol Biofuels

109

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BackgroundShortages in fresh water supplies today affects more than 1 billion people worldwide. Phytoremediation strategies, based on the abilities of aquatic plants to recycle nutrients offer an attractive solution for the bioremediation of water pollution and represents one of the most globally researched issues. The subsequent application of the biomass from the remediation for the production of fuels and petrochemicals offers an ecologically friendly and cost-effective solution for water pollution problems and production of value-added products.ResultsIn this paper, the feasibility of the dual application of duckweed and azolla aquatic plants for wastewater treatment and production of renewable fuels and petrochemicals is explored. The differences in absorption rates of the key wastewater nutrients, ammonium and phosphorus by these aquatic macrophytes were used as the basis for optimization of the composition of wastewater effluents. Analysis of pyrolysis products showed that azolla and algae produce a similar range of bio-oils that contain a large spectrum of petrochemicals including straight-chain C10-C21 alkanes, which can be directly used as diesel fuel supplement, or a glycerin-free component of biodiesel. Pyrolysis of duckweed produces a different range of bio-oil components that can potentially be used for the production of “green” gasoline and diesel fuel using existing techniques, such as catalytic hydrodeoxygenation.ConclusionsDifferences in absorption rates of the key wastewater nutrients, ammonium and phosphorus by different aquatic macrophytes can be used for optimization of composition of wastewater effluents. The generated data suggest that the composition of the petrochemicals can be modified in a targeted fashion, not only by using different species, but also by changing the source plants’ metabolic profile, by exposing them to different abiotic or biotic stresses. This study presents an attractive, ecologically friendly and cost-effective solution for efficient bio-filtration of swine wastewater and petrochemicals production from generated biomass.

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Section: Resultssupporting

confidence: 91%

Dual application of duckweed and azolla plants for wastewater treatment and renewable fuels and petrochemicals production

Muradov

Taha

Miranda

et al. 2014

Biotechnol Biofuels

109

View full text Add to dashboard Cite

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“…The slopes of the ammonium reduction curve at influent pH values up to 8.0 and 9.0 are sharper than that at the lower pH value. The optimal pH of immobilized microorganism was 8.0, and the similar result was reported previously [9]. …”

Section: A Factors Influencing Of Ammonium Removalsupporting

confidence: 89%

Coimmobilized Microalgae and Nitrifying Bacteria for Ammonium Removal

Bai¹,

Gu²,

Li³

2016

IJESD

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“…The declining trend of pH also validates the occurrences of nitrification process in this system. The earlier reports have also suggested a decrease in pH after treating wastewater through duckweed‐based treatment process . The resultant low EC was perhaps due to the accumulation and adsorption (or absorption) of different nutrients (nitrate, phosphate, sulfate, calcium, sodium, potassium etc.)…”

Section: Resultsmentioning

confidence: 90%

Impact of density loads on performance of duckweed bioreactor: A potential system for synchronized wastewater treatment and energy biomass production

Verma

Suthar

2015

Env Prog and Sustain Energy

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Duckweed Lemna gibba has been listed as a promising plant for wastewater treatment and energy biomass production. This study aims to study the efficacy of L. gibba based bioreactor in removal of wastewater pollutants loads and energy-rich biomass harvesting under different plant biomass density loads. A total of four density loads: 20% (T1), 40% (T2), 60% (T3), and 80% (T4) of inoculants biomass were used to construct duckweed reactors and changes in wastewater (WW) and duckweed biomass characteristics (growth rate, biochemical composition etc.) were recorded for 21 days. The nutrient load in WW reduced significantly: NO32N (83-89%), SO 4 2-30 (85-86%) and total phosphorus (TP) (67-72%) at the end in all experimental set-ups. The reactor with 20% inoculation density showed the maximum WW nutrient removal. The weed biomass yield showed the direct relationship with inoculation density in all experimental set-ups. The yield (dry weight basis) of carbohydrate, starch and protein was: 1.39-1.77 g m 22 day 21 , 1.10-1.20 g m 22 day 21 , and 1.9-2.24 g m 22 day 21 , respectively in different set-ups. The high yield of starch under optimized density load suggests the utility of harvested biomass for bioethanol production. Results thus, suggested that inoculation density directly plays an important role in performance of duckweed reactors in terms of WW treatment and energy biomass synthesis.

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Nutrient removal and greenhouse gas emissions in duckweed treatment ponds

Cited by 46 publications

References 76 publications

Dual application of duckweed and azolla plants for wastewater treatment and renewable fuels and petrochemicals production

Dual application of duckweed and azolla plants for wastewater treatment and renewable fuels and petrochemicals production

Coimmobilized Microalgae and Nitrifying Bacteria for Ammonium Removal

Impact of density loads on performance of duckweed bioreactor: A potential system for synchronized wastewater treatment and energy biomass production

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