Removal of pathogens from domestic wastewater by microalgal-bacterial systems under different cultivation conditions

Ruas, Graziele; Serejo, Mayara Leite; Farias, Sarah Lacerda; Scarcelli, Priscila Guenka; Boncz, Marc Árpád

doi:10.1007/s13762-021-03820-2

Cited by 15 publications

(9 citation statements)

References 64 publications

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“…Several factors affecting the removal of individual bacteria from algal-bacterial systems are aeration, the addition of carbon dioxide, and the photoperiod. For example, these factors affected the elimination of sanitary-indicative microorganisms from domestic wastewater (such as Pseudomonas aeruginosa , Enterococcus faecalis , and Escherichia coli ) [ 59 ].…”

Section: Resultsmentioning

confidence: 99%

Growth Efficiency of Chlorella sorokiniana in Synthetic Media and Unsterilized Domestic Wastewater

Bulynina

Ziganshina

Ziganshin

2023

BioTech

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Incorporating a variety of microalgae into wastewater treatment is considered an economically viable and environmentally sound strategy. The present work assessed the growth characteristics of Chlorella sorokiniana during cultivation in balanced synthetic media and domestic wastewater. Increasing the NH4+–N concentration to 360 mg L−1 and adding extra PO43−–P and SO42−–S (up to 80 and 36 mg L−1, respectively) contributed to an increase in the total biomass levels (5.7–5.9 g L−1) during the cultivation of C. sorokiniana in synthetic media. Under these conditions, the maximum concentrations of chlorophylls and carotenoids were 180 ± 7.5 and 26 ± 1.4 mg L−1, respectively. Furthermore, when studying three types of domestic wastewaters, it was noted that only one wastewater contributed to the productive growth of C. sorokiniana, but all wastewaters stimulated an increased accumulation of protein. Finally, the alga, when growing in optimal unsterilized wastewater, showed a maximum specific growth rate of 0.73 day−1, a biomass productivity of 0.21 g L−1 day−1, and 100% NH4+–N removal. These results demonstrate that the tested alga actively adapts to changes in the composition of the growth medium and accumulates high levels of protein in systems with poor-quality water.

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Section: Resultsmentioning

confidence: 99%

Growth Efficiency of Chlorella sorokiniana in Synthetic Media and Unsterilized Domestic Wastewater

Bulynina

Ziganshina

Ziganshin

2023

BioTech

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“…One of the major concerns regarding the application of fertilizers from the treatment of sanitary sewage is the potential presence of contaminants such as pathogens and heavy metals. Different studies demonstrate the efficiency of microalgae in disinfecting the environment by varying the conditions such as pH and oxygen concentration, and by intra-algal competition for nutrients and light [25,84,85]. Moreover, exposure to the sunlight and the drying process at temperatures above 55˚C inactivate bacteria such as Escherichia coli and disinfect the effluent [86][87][88], thus ensuring the safety of products derived from sewage treatment for use in agriculture.…”

Section: Plos Onementioning

confidence: 99%

“…The ability of microalgae to use inorganic compounds such as N and P for their growth makes them efficient at removing nutrients from wastewater, which can reach up to 90% [ 22 , 23 ]. Additionally, microalgae can help in disinfection by varying the pH and improving the quality of the final effluent [ 20 , 24 , 25 ]. The recovery of chemical energy and nutrients from microalgae biomass is also possible.…”

Section: Introductionmentioning

confidence: 99%

Biofertilizers from wastewater treatment as a potential source of mineral nutrients for growth of amaranth plants

Ferreira,

Barrochelo,

de Melo

et al. 2023

PLoS ONE

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Exploring alternative fertilizers is crucial in agriculture due to the cost and environmental impact of inorganic options. This study investigated the potential of sewage-derived biofertilizers on the growth and physiology of Amaranthus cruentus plants. Various treatments were compared, including control treatments with inorganic fertilizer and treatments with biofertilizers composed of microalgae, biosolids and reclaimed water. The following traits were investigated: photosynthetic pigments, gas exchange, growth, and leaf nutrient concentrations. The results showed that the concentrations of N, P, Cu, Fe Zn and Na nutrients, in the dry microalgae and biosolids, were quite high for the needs of the plants. The wet microalgae presented high concentration of Cu, Fe and Zn nutrients while reclaimed water contained high concentration of N, K, Ca and S. Na and Zn nutrients increased in the leaf of plants treated with dry microalgae and biosolid, respectively. At the beginning of the flowering phase, total chlorophyll and carotenoids contents were lower for plants grown with wet microalgae while for plants grown with higher doses of biosolid or reclaimed water total chlorophyll was increased, and carotenoids were not affected. Lower photosynthetic pigments under wet microalgae resulted in lower photosynthetic rates. On the other hand, amendments with dry microalgae and biosolid increased photosynthetic rates with the biosolid being the most effective. Higher applications of biosolid, wet and dry microalgae produced a considerable increase in shoot biomass of amaranth, with the dry microalgae being the most effective. Additionally, reclaimed water obtained after tertiary treatment of sewage with microalgae and biosolids applied alone showed promising effects on plant growth. Overall, these findings suggest that organic fertilizers derived from sewage treatment have the potential to enhance plant growth and contribute to sustainable agricultural practices.

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“…Massive anthropogenic activities generate 359.4 × 10 9 m 3 of wastewater annually, and only 52% is treated before its discharge into natural water bodies [1]. The existing treatment methods in urban wastewater treatment plants (UWWTPs) are not effective either because [2][3][4][5][6]: (i) the conventional secondary treatments are ineffective in the reduction of contaminants of emerging concern, such as heavy metals, pharmaceuticals, and antibioticresistant bacteria and their genetic determinants (ARB&Gs); (ii) the implementation of tertiary treatments require high energy demands and thus are cost-effective; or (iii) some of the existent disinfection processes (such as chlorination or ozonation) imply the use of additional chemicals or the generation of other harmful by-products, some of them classified as carcinogenic compounds [7][8][9]. Hence, the continuous disposal of wastewater containing high concentrations of chemical pollutants, pathogens, and ARGs, can severely put freshwater quality at risk and jeopardize public health [1,[10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

“…Additionally, the biomass obtained at the end of the process can be converted to commercially valued products, such as biofuels or biofertilizers, paying off the photobioreactor implementation's costs [15,16]. Moreover, the operational conditions inherent to microalgal production (such as pH, dissolved oxygen and carbon dioxide concentrations, light exposure, and hydraulic retention time), were described to create hostile conditions for some potentially harmful bacteria, such as faecal coliforms [4,[17][18][19][20]. Particularly, light exposure above 115 µmol m −2 s −1 has a crucial role in E. coli removal, in combination with DO values between 1.2-8.18 mg L −1 and alkaline pH (above 8.5) [21,22].…”

Section: Introductionmentioning

confidence: 99%

Microalgal Systems, a Green Solution for Wastewater Conventional Pollutants Removal, Disinfection, and Reduction of Antibiotic Resistance Genes Prevalence?

et al. 2023

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The low-efficiency rate of urban wastewater (UWW) treatment generates tons of discharged water with a high concentration of pollutants, pathogens and antibiotic-resistance genes (ARGs). Microalgal systems may be a green alternative to be implemented as a UWW polishing treatment. This study assessed the ability of Chlorella vulgaris and UWW autochthonous microalgal species (AMS) to simultaneously remove PO4–P, and reduce the proliferation of coliforms and ARGs. AMS seems to be more promising due to: (i) the higher specific growth rate, μmax (0.687 ± 0.065 d−1); (ii) efficient PO4–P removal (92.62 ± 0.10%); (iii) faster reduction of coliforms proliferation achieving concentrations below the limits of quantification (6 d); (iv) the reduction of intl1 and the ARGs sul1 and blaTEM abundance in ca. of 70.4%, 69.2%, and 75.7%, respectively (9 d); and (v) the additional reduction of these genes in ca. of 97.1%, 94.2%, and 99.9%, respectively, after 5 d storage in the dark and at room temperature. Results also revealed that the high pH values in both microalgal systems (due to microalgal growth) were highly correlated with a reduction in the proliferation of coliforms, including Escherichia coli. In conclusion, using AMS as a final polishing treatment of UWW seems to be very promising.

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Removal of pathogens from domestic wastewater by microalgal-bacterial systems under different cultivation conditions

Cited by 15 publications

References 64 publications

Growth Efficiency of Chlorella sorokiniana in Synthetic Media and Unsterilized Domestic Wastewater

Growth Efficiency of Chlorella sorokiniana in Synthetic Media and Unsterilized Domestic Wastewater

Biofertilizers from wastewater treatment as a potential source of mineral nutrients for growth of amaranth plants

Microalgal Systems, a Green Solution for Wastewater Conventional Pollutants Removal, Disinfection, and Reduction of Antibiotic Resistance Genes Prevalence?

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