Integral use of Nejayote: Characterization, New Strategies for Physicochemical Treatment and Recovery of Valuable By-Products

López-Maldonado, Eduardo Alberto; Guzmán, Mónica; Suárez-Meraz, Karla Alejandra

doi:10.5772/66223

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…The value of the TOC has not always been included in reports on nejayote in the literature. The value detected presently (26,584.05 mg L −1 ) is far above any previously published value (<10,000 mg L −1 ) [10,49] and almost 700-fold greater than the maximum established by the Mexican norm for the disposal of residual water in rivers (38 mg L −1 ) [11].…”

Section: Physicochemical Composition Of Nejayotecontrasting

confidence: 54%

Bioremediation with an Alkali-Tolerant Yeast of Wastewater (Nejayote) Derived from the Nixtamalization of Maize

Román-Escobedo,

Cristiani-Urbina,

Morales-Barrera

2024

Fermentation

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Nejayote, the wastewater from the nixtamalization of maize, is difficult to biodegrade due to its abundant calcium content; low levels of nitrogen, phosphorus, and easily assimilable sugars; elevated pH; and high chemical oxygen demand (COD). The aim of the present study was to isolate microorganisms capable of utilizing filtered nejayote (NEM) as the only source of carbon for growth and to test the best microorganism for the bioremediation of this wastewater by lowering the level of pH and COD. Of the 15 strains of microorganisms tested, Rhodotorula mucilaginosa LCRE was chosen and identified using molecular techniques. Subsequently, its growth kinetics were characterized during cultivation in unenriched NEM (control) and NEM enriched with nitrogen and phosphorus salts. R. mucilaginosa LCRE showed a greater growth (6.9 ≤ X ≤ 8.9 g L−1), biomass yield (0.33 ≤ YX/S ≤ 0.39 g g−1), and specific growth rate (0.748 ≤ µ ≤ 0.80 day−1) in the enriched versus control NEM (X = 6.55 g L−1, YX/S = 0.28 g g−1, and µ = 0.59 day−1). However, a higher total sugar consumption (94.98%), better COD removal efficiency (75.5%), and greater overall COD removal rate (1.73 g L−1 h−1) were found in the control NEM. Hence, R. mucilaginosa LCRE holds promise for the efficient bioremediation of nejayote without costly pretreatments or nutrient supplementation.

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Section: Physicochemical Composition Of Nejayotecontrasting

confidence: 54%

Bioremediation with an Alkali-Tolerant Yeast of Wastewater (Nejayote) Derived from the Nixtamalization of Maize

Román-Escobedo,

Cristiani-Urbina,

Morales-Barrera

2024

Fermentation

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“…But it has also led to the generation of a polluting water byproduct called nejayote (50 million m 3 /year) (Acosta-Estrada, Lazo-Vélez, et al, 2015;Acosta-Estrada, Serna-Saldivar, et al, 2015). Nejayote is the residual alkaline liquid rich in grain endocarp and pericarp (Díaz-Montes et al, 2016), and it has been considered a pollutant of water due to certain physicochemical parameters (BDO, COD, alkaline pH, and %CaCO 3 ) in addition to organic matter present (López-Maldonado et al, 2017).…”

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confidence: 99%

Phenolic extract from nejayote flour: Bioactive properties and its potential use as an antimicrobial agent of alginate‐based edible coatings

et al. 2021

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The management of agri-food by-products or waste is considered a priority global industrial, economic, and environmental problem, and its solution requires a comprehensive and sustainable approach (García-García et al., 2017). The chemical composition of the residues that emerge is diverse and depends on the product nature and its processing. Inadequate disposal causes environmental problems, including greenhouse gas emissions, because of their high biodegradability, moisture, and microbial load (Fritsch et al., 2017). Certain wastes have a wide variety of components with a nutritional,

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“…The nejayote wastewater was characterized. The pH was found to be 8.6, the total solids were 10 g/L, the COD was 1798 mg/L, ammonia was 23.91 mg/L, and orthophosphates were 8.9 mg/L [17][18][19][20].…”

Section: Sample Characteristicsmentioning

confidence: 96%

Nejayote and Food Waste Leachate as a Medium for Scenedesmus acutus and Haematococcus pluvialis Production: A Mixture Experimental Design

Garza-Valverde,

García-Gómez,

Nápoles-Armenta

et al. 2024

Water

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The wastewaters of nejayote and food waste leachate are polluting effluents with a high load of organic matter that cause great problems when discharged to water receptors. In this work, we investigated the treatment of nejayote wastewaters and food waste leachate for the production of microalgae Scenedesmus acutus and Haematococcus pluvialis. For Scenedesmus acutus, treatment with 10% food waste leachate and 90% growth medium resulted in a concentration of 5.34 g/L in 20 days (μmax = 0.16/day). Meanwhile, 10% nejayote and 90% medium growth produced 4.45 g/L at 20 days (μmax = 0.13/d). A significant reduction of up to 82.6% ammonium, 84.1% orthophosphate, and 87.25% COD was also observed between the different treatments. For Haematococcus pluvialis, the treatment of 90% food waste leachate and 10% growth medium produced a concentration of 4.73 g/L at 6 days (μmax = 0.71/day), while the mixture of 25% najayote, 25% food waste leachate, and 50% growth medium produced a concentration of 5.5 g/L at 20 days (μmax = 0.25/dat). A reduction of up to 97.8% ammonia, 97.4% orthophosphate, and 73.19% COD was also recorded. These findings demonstrated the potential to cultivate microalgae and extract biomolecules for commercial purposes.

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Integral use of Nejayote: Characterization, New Strategies for Physicochemical Treatment and Recovery of Valuable By-Products

Cited by 5 publications

References 22 publications

Bioremediation with an Alkali-Tolerant Yeast of Wastewater (Nejayote) Derived from the Nixtamalization of Maize

Bioremediation with an Alkali-Tolerant Yeast of Wastewater (Nejayote) Derived from the Nixtamalization of Maize

Phenolic extract from nejayote flour: Bioactive properties and its potential use as an antimicrobial agent of alginate‐based edible coatings

Nejayote and Food Waste Leachate as a Medium for Scenedesmus acutus and Haematococcus pluvialis Production: A Mixture Experimental Design

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