Two stage treatment of dairy effluent using immobilized Chlorella pyrenoidosa

Yadavalli, Rajasri; Heggers, Goutham Rao Venkata Naga

doi:10.1186/2052-336x-11-36

Cited by 44 publications

(11 citation statements)

References 19 publications

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“…Microalgae and culture medium C. pyrenoidosa was collected from Department of Biotechnology, IIT Roorkee and grown in BG11 culture medium (without adding carbon source) (Park et al 2011;Yadavalli and Heggers 2013).The composition of BG11 media are given in Tables 1 and 2 as follows:…”

Section: Methodsmentioning

confidence: 99%

Prediction of phycoremediation of As(III) and As(V) from synthetic wastewater by Chlorella pyrenoidosa using artificial neural network

Podder

Majumder

2017

Appl Water Sci

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An artificial neural network (ANN) model was developed to predict the phycoremediation efficiency of Chlorella pyrenoidosa for the removal of both As(III) and As(V) from synthetic wastewater based on 49 data-sets obtained from experimental study and increased the data using CSCF technique. The data were divided into training (60%) validation (20%) and testing (20%) sets. The data collected was used for training a three-layer feed-forward back propagation (BP) learning algorithm having 4-5-1 architecture. The model used tangent sigmoid transfer function at input to hidden layer (tansing) while a linear transfer function (purelin) was used at output layer. Comparison between experimental results and model results gave a high correlation coefficient (R allANN 2 equal to 0.99987 for both ions and exhibited that the model was able to predict the phycoremediation of As(III) and As(V) from wastewater. Experimental parameters influencing phycoremediation process like pH, inoculum size, contact time and initial arsenic concentration [either As(III) or As(V)] were investigated. A contact time of 168 h was mainly required for achieving equilibrium at pH 9.0 with an inoculum size of 10% (v/v). At optimum conditions, metal ion uptake enhanced with increasing initial metal ion concentration.

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Section: Methodsmentioning

confidence: 99%

Prediction of phycoremediation of As(III) and As(V) from synthetic wastewater by Chlorella pyrenoidosa using artificial neural network

Podder

Majumder

2017

Appl Water Sci

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“…According to the study on N 15 -labeled fertilizer, cyanobacteria assimilate more nitrogen than chemical fertilizer and are more reliable for rice plant cultivation (Fernández Valiente et al, 2000). Another exciting research on immobilized Chlorella pyrenoidosa on dairy waste effluent as a biofertilizer gives a 30% surge in paddy root and shoots length (Yadavalli and Heggers, 2013). A study also found a yield of 650 mg L −1 of Chlorella sp.…”

Section: Biofertilizermentioning

confidence: 99%

Valorization of Wastewater Resources Into Biofuel and Value-Added Products Using Microalgal System

et al. 2021

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Wastewater is not a liability, instead considered as a resource for microbial fermentation and value-added products. Most of the wastewater contains various nutrients like nitrates and phosphates apart from the organic constituents that favor microbial growth. Microalgae are unicellular aquatic organisms and are widely used for wastewater treatment. Various cultivation methods such as open, closed, and integrated have been reported for microalgal cultivation to treat wastewater and resource recovery simultaneously. Microalgal growth is affected by various factors such as sunlight, temperature, pH, and nutrients that affect the growth rate of microalgae. Microalgae can consume urea, phosphates, and metals such as magnesium, zinc, lead, cadmium, arsenic, etc. for their growth and reduces the biochemical oxygen demand (BOD). The microalgal biomass produced during the wastewater treatment can be further used to produce carbon-neutral products such as biofuel, feed, bio-fertilizer, bioplastic, and exopolysaccharides. Integration of wastewater treatment with microalgal bio-refinery not only solves the wastewater treatment problem but also generates revenue and supports a sustainable and circular bio-economy. The present review will highlight the current and advanced methods used to integrate microalgae for the complete reclamation of nutrients from industrial wastewater sources and their utilization for value-added compound production. Furthermore, pertaining challenges are briefly discussed along with the techno-economic analysis of current pilot-scale projects worldwide.

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“…The beads settle rapidly or can be separated from wastewater by sieving, simplifying harvesting of the algae . The beads can then be used directly as fertilizer or digested for biomethane production . Furthermore, cultivation in beads protects the culture from harmful contaminants in the wastewater and enables selection of an algal species which has favourable nutrient removal traits or high value for product recovery without risk of the species becoming contaminated over time .…”

Section: Introductionmentioning

confidence: 99%

Nutrient removal by alginate‐immobilized Chlorella vulgaris: response to different wastewater matrices

Kube

Spedding

Gao

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Immobilized algae are a promising tool to treat wastewater within a short time (<12 h) and simplify biomass harvesting compared with suspended algae. The potential of alginate-entrapped Chlorella vulgaris to bioremediate secondary (with and without nutrient supplementation), primary and two lagoon municipal wastewaters was investigated. The capability of the system to adapt to these wastewaters was analysed by determining biotic and abiotic nutrient removal, and further evaluated by comparison with suspended cells.RESULTS: The algal nitrogen (N) content (4.6-7.8 wt%) was closely related to the wastewater ammonium concentration (R 2 = 0.97). The algal cells did not adapt N uptake as effectively to wastewater nitrate concentration because both abiotic N and phosphorus (P) removal increased. The algal P content (1.2-3.2 wt%) varied in response to the wastewater P and was inversely related to the initial cellular P content. The algae thus adapted nutrient uptake to the wastewater N:P level and ratio when ammonium predominated. Biomass production (35-73 mg L -1 d -1 ) increased with dissolved organic and inorganic carbon with little impact from other wastewater characteristics. Immobilization did not affect N and P uptake per cell compared with suspended algae. CONCLUSION: Decoupling biotic and abiotic removal showed adaptation to the N:P of the wastewater and luxury P uptake had significant impact during treatment of different wastewater matrices, these traits were not affected by immobilization. Immobilization enables increased N and P removal rates compared with suspended algal systems as nutrient uptake per cell is not affected and higher concentrations of algal biomass within the reactor are facilitated.To meet the desired feed nutrient levels 184 mg L −1 NaNO 3 was added to SE1 + NO3, 115 mg L −1 of NH 4 Cl was added to SE1 + NH4, 268 mg L −1 of NaNO 3 to SE2 + NO3, and 156 mg L −1 of NH 4 Cl to SE2 + NH4.Immobilized algae adapt nutrient removal to different wastewaters www.soci.org

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Two stage treatment of dairy effluent using immobilized Chlorella pyrenoidosa

Cited by 44 publications

References 19 publications

Prediction of phycoremediation of As(III) and As(V) from synthetic wastewater by Chlorella pyrenoidosa using artificial neural network

Prediction of phycoremediation of As(III) and As(V) from synthetic wastewater by Chlorella pyrenoidosa using artificial neural network

Valorization of Wastewater Resources Into Biofuel and Value-Added Products Using Microalgal System

Nutrient removal by alginate‐immobilized Chlorella vulgaris: response to different wastewater matrices

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