Assessing the potentials of Lemna minor in the treatment of domestic wastewater at pilot scale

Priya, Anima; Avishek, Kirti; Pathak, Gopal

doi:10.1007/s10661-011-2265-6

Cited by 57 publications

(23 citation statements)

References 25 publications

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“…As nitrogen is an essential plant nutrient, it can be removed through plant uptake of ammonium or nitrate, and stored in organic form in plant body . Along‐with plant uptake, ammonia volatilization, nitrification, denitrification, assimilation by bio‐film associated with root zone and sedimentation were supposed to be possible mechanism for tot N removal in duckweed pond‐based wastewater nutrient removal system. TP removal in different set‐ups was in the order of T 2 > T 3 > T 1 > T 4 > T 5 (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…TP removal in different set-ups was in the order of T 2 > T 3 > T 1 > T 4 > T 5 ( Table 4). The bacterial degradation are adsorption to organic matter, chemical precipitation microbial uptake etc are suggested as possible mechanism of TP removal from wastewater in duckweed system [49]. It has been realized that phosphorus uptake by duckweed results in the growth of new tissues, not by increasing the tissue phosphorus content [24].…”

Section: Removal Of Wastewater Nutrient Under Different Inoculation Dmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Removal Of Wastewater Nutrient Under Different Inoculation Dmentioning

confidence: 99%

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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“…treatment plant for remediation of municipal effluents [198] and combination of two or more plant increased the effectiveness of removal [199][200][201].…”

Section: Phytoremediation Of Organic Pollutant In Watermentioning

confidence: 99%

Phytoremediation of Polluted Waterbodies with Aquatic plants: Recent Progress on Heavy Metal and Organic Pollutants

Christian¹,

Beniah²

2019

Preprint

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Heavy metals and organic pollutants are ubiquitous environmental pollutants affecting the quality of soil, water and air. Over the past 5 decades, many strategies have been developed for the remediation of polluted water. Strategies involving aquatic plant use are preferable to conventional methods. In this study, an attempt was made to provide a brief review on recent progresses in research and practical applications of phytoremediation for water resources with the following objectives: (1) to discuss the toxicity of toxic chemicals pollution in water to plant, animals and human health (2) to summarise the physicochemical factors affecting removal of toxic chemicals such as heavy metals and organic contaminants in aqueous solutions by aquatic plants; (3) to summarise and compare the removal rates of heavy metals and organic contaminants in aqueous solutions by diverse aquatic plants; and (4) to summarise chemometric models for testing aquatic plant performance. More than 20 aquatic plants specie have been used extensively while duckweed (L. minor), water hyacinth (Eichhornia crassipes), water lettuce (P. stratiotes) are the most common. Overall, chemometrics for performance assessment reported include: Growth rate (GR), Growth rate inhibition (% Inhibition), Metal uptake (MU), translocation/transfer factor (TF), bioconcentration factor (BCF), Percent metal uptake (% MU), Removal capacity (RC) and Tolerance index (TI) while absorption rate have been studied using the sorption kinetics and isotherms models such as pseudo-first-order (PFO), pseudo-second-order (PSO), Freundlich, Langmuir and Temkin. Using modeling and interpretation of adsorption isotherms for performance assessment is particularly good and increases level of accuracy obtained from adsorption processes of contaminant on plant. Conclusion was drawn by highlighting the gap in knowledge and suggesting key future areas of research for scientists and policymakers.

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“…In case study 2, macrophyte duckweed (15 gm wet weight) is introduced in 15 litres pond water sample. Duckweed is a member of the Lamnacae family of floating plants that grow fast and spread quickly [10]. The collected water sample is analyzed for water quality parameters namely dissolved oxygen, carbon dioxide, phosphate, nitrate, ammonia, pH, temperature and water depth which are used as input parameters in Aquatox model.…”

Section: Artificial Ponds Simulationmentioning

confidence: 99%

Modeling of Nutrients Removal in Lab Scale Ecosystem using Aquatox

2019

IJRTE

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Paper Protection and restoration of water resources is a major challenging task in recent past. In this study, ability of Aquatox in predicting small scale aquatic ecosystem is studied with limited data. For this purpose experimental pond is created with and without macrophyte duckweed. The Root Mean Square Error (RMSE) is used as performance measure for simulated and experimental values. The phosphate and ammonia concentrations are well predicted while the prediction of nitrate is not encouraging which may require some additional parameters in this model for prediction. After introducing detritus (sediment) as input parameter, RMSE decreases and it is confirmed that sediments parameter improve the model prediction. This suggests special attention is to be given for selection of input parameters in small lab scale aquatic ecosystem.

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Assessing the potentials of Lemna minor in the treatment of domestic wastewater at pilot scale

Cited by 57 publications

References 25 publications

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

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

Phytoremediation of Polluted Waterbodies with Aquatic plants: Recent Progress on Heavy Metal and Organic Pollutants

Modeling of Nutrients Removal in Lab Scale Ecosystem using Aquatox

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