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

Verma, Rashmi; Suthar, Surindra

doi:10.1002/ep.12157

Cited by 14 publications

(9 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fast growing duckweed in nutrient rich water is a highly efficient sink for both phosphorus and potassium; little of each, however, is required for rapid growth. In concurrence with the present findings, Verma and Suthar [13] have also reported that the nutrient load in wastewater reduced significantly by 83-89% of NO 3 -and 67-72% of total phosphorus. Pandey [14] reported that in the duckweed treatment system at Halisahar, nitrogen and phosphorus removals were in the range of 50-75% and 17-35% respectively.…”

Section: Macronutrients (N P K Ca Mg)supporting

confidence: 93%

Evaluation of the Efficiency of Duckweed (Lemna minor L.) as a Phytoremediation Agent in Wastewater Treatment in Kashmir Himalayas

Showqi¹,

Lone²,

Bhat³

2017

J Bioremediat Biodegrad

View full text Add to dashboard Cite

In the present study, the efficiency of duckweed (Lemna minor L.) as an effective natural biological tool in wastewater treatment was examined in an outdoor aquatic system. Duckweed plants were inoculated into wastewater and tap water systems for treatment over fifteen day's retention periods under local outdoor natural conditions. Water samples were taken below duckweed cover after fifteen days to assess the plant's efficiency in purifying waste water from different pollutants. For comparison, the plants were also grown in tubs containing tap water. The results show that concentrations of Nitrogen (N), Phosphorus (P), Potassium (K), Calcium (Ca), Magnesium (Mg), Copper (Cu), Zinc (Zn), Nickel (Ni), Chromium (Cr), Cadmium (Cd) and Lead (Pb) decreased by 93. 4%, 99.9%, 93.9%, 98.5%., 91.9%, 85.0%, 95.0%, 90.0%, 99.8%, 99.5% and 95.0% respectively in waste water and subsequently these elements exhibited an increasing concentration in the plant body. Almost similar results were obtained when the plants were grown in tubs containing tap water. Biochemical parameters viz. chl-a, b, total-chl, carbohydrates and proteins as well as nutrient status of the macrophyte increased after the completion of the retention period both in waste and tap water. Results confirm that duckweeds can effectively be used for wastewater treatment systems.

show abstract

Section: Macronutrients (N P K Ca Mg)supporting

confidence: 93%

Evaluation of the Efficiency of Duckweed (Lemna minor L.) as a Phytoremediation Agent in Wastewater Treatment in Kashmir Himalayas

Showqi¹,

Lone²,

Bhat³

2017

J Bioremediat Biodegrad

View full text Add to dashboard Cite

show abstract

“…As such, the absolute biomass yield is an important parameter, as it relates directly to the amount of plant mass available for further use [ 27 ]. Previously, high duckweed densities of 60–80% plant coverage (around 160–280 g m −2 ) have been reported to result in maximum yields, in combination with different harvesting regimes [ 39 , 79 , 80 ]. Data from stationary experiment 1 and the re-circulating experiment show that at higher plant densities the logarithmic relationship between plant density and yield will plateau.…”

Section: Discussionmentioning

confidence: 99%

Density Dependence Influences the Efficacy of Wastewater Remediation by Lemna minor

Walsh

Coughlan

O’Brien

et al. 2021

Plants

View full text Add to dashboard Cite

As part of a circular economy (CE) approach to food production systems, Lemnaceae, i.e., duckweed species, can be used to remediate wastewater due to rapid nutrient assimilation and tolerance of non-optimal growing conditions. Further, given rapid growth rates and high protein content, duckweed species are a valuable biomass. An important consideration for duckweed-mediated remediation is the density at which the plants grow on the surface of the wastewater, i.e., how much of the surface of the medium they cover. Higher duckweed density is known to have a negative effect on duckweed growth, which has implications for the development of duckweed-based remediation systems. In the present study, the effects of density (10–80% plant surface coverage) on Lemna minor growth, chlorophyll fluorescence and nutrient remediation of synthetic dairy processing wastewater were assessed in stationary (100 mL) and re-circulating non-axenic (11.7 L) remediation systems. Overall, L. minor growth, and TN and TP removal rates decreased as density increased. However, in the stationary system, absolute TN and TP removal were greater at higher densities (50–80% coverage). The exact cause of density related growth reduction in duckweed is unclear, especially at densities well below 100% surface coverage. A further experiment comparing duckweed grown at ‘low’ and ‘high’ density conditions with the same biomass and media volume conditions, showed that photosynthetic yield, Y(II), is reduced at high density despite the same nutrient availability at both densities, and arguably similar shading. The results demonstrate a negative effect of high density on duckweed growth and nutrient uptake, and point towards signals from neighbouring duckweed colonies as the possible cause.

show abstract

“…Diluted (50%) SeSW was less stressful to L. punctata, which was reflected by higher rates of nutrient uptake: 74%, 43%, and 94% for NH 4 , PO 4 and NO 3 , respectively (Table 1, Figure 1). A broad spectrum of absorption rates of nutrients by L. punctata and other duckweed species has been reported [6,14,30,32,[34][35][36]58,[62][63][64][65][66][67][68]. Short-term treatment of the SeSW by L. punctata did not lead to a significant increase in biomass production (1.5-fold, Table 1).…”

Section: Removal Of Nitrogen and Phosphorus By L Punctatamentioning

confidence: 94%

Aquatic Plants, Landoltia punctata, and Azolla filiculoides as Bio-Converters of Wastewater to Biofuel

Miranda

Kumar

Spangenberg

et al. 2020

Plants

View full text Add to dashboard Cite

The aquatic plants, Azolla filiculoides, and Landoltia punctate, were used as complementing phytoremediators of wastewater containing high levels of phosphate, which simulates the effluents from textile, dyeing, and laundry detergent industries. Their complementarities are based on differences in capacities to uptake nitrogen and phosphate components from wastewater. Sequential treatment by L. punctata followed by A. filiculoides led to complete removal of NH4, NO3, and up to 93% reduction of PO4. In experiments where L. punctata treatment was followed by fresh L. punctata, PO4 concentration was reduced by 65%. The toxicity of wastewater assessed by shrimps, Paratya australiensis, showed a four-fold reduction of their mortality (LC50 value) after treatment. Collected dry biomass was used as an alternative carbon source for heterotrophic marine protists, thraustochytrids, which produced up to 35% dry weight of lipids rich in palmitic acid (50% of total fatty acids), the key fatty acid for biodiesel production. The fermentation of treated L. punctata biomass by Enterobacter cloacae yielded up to 2.14 mol H2/mole of reduced sugar, which is comparable with leading terrestrial feedstocks. A. filiculoides and L. punctata can be used as a new generation of feedstock, which can treat different types of wastewater and represent renewable and sustainable feedstock for bioenergy production.

show abstract

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

Cited by 14 publications

References 44 publications

Evaluation of the Efficiency of Duckweed (Lemna minor L.) as a Phytoremediation Agent in Wastewater Treatment in Kashmir Himalayas

Evaluation of the Efficiency of Duckweed (Lemna minor L.) as a Phytoremediation Agent in Wastewater Treatment in Kashmir Himalayas

Density Dependence Influences the Efficacy of Wastewater Remediation by Lemna minor

Aquatic Plants, Landoltia punctata, and Azolla filiculoides as Bio-Converters of Wastewater to Biofuel

Contact Info

Product

Resources

About