Evaluation of domestic wastewater treatment using microalgal-bacterial processes: effect of CO2 addition on pathogen removal

Ruas, Graziele; Serejo, Mayara Leite; Paulo, Paula Loureiro; Boncz, Marc Árpád

doi:10.1007/s10811-017-1280-6

Cited by 39 publications

(12 citation statements)

References 45 publications

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“…This discrepancy may be due to the fact that maturation ponds are characterized by lower pH conditions than HRAPs [ 33 ]. Because pH > 10 and temperatures > 25°C can be experienced in HRAPs [ 34 , 35 ], alkaline-pH induced toxicity may indeed be significant in these systems. Such heightened decay rates agrees with findings from Parhad and Rao (1974) [ 36 ] who reported enhanced E .…”

Section: Resultsmentioning

confidence: 99%

Study from microcosms and mesocosms reveals Escherichia coli removal in high rate algae ponds during domestic wastewater treatment is primarily caused by dark decay

2022

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While high rate algal ponds (HRAPs) can provide efficient pathogen removal from wastewater, the mechanisms involved remain unclear. To address this knowledge gap, the mechanisms potentially causing Escherichia coli (E. coli) removal during microalgae-based wastewater treatment were successively assessed using laboratory microcosms designed to isolate known mechanisms, and bench scale assays performed in real HRAP broth. During laboratory assays, E. coli decay was only significantly increased by alkaline pH (above temperature-dependent thresholds) due to pH induced toxicity, and direct sunlight exposure via UV-B damage and/or endogenous photo-oxidation. Bench assays confirmed alkaline pH toxicity caused significant decay but sunlight-mediated decay was not significant, likely due to light attenuation in the HRAP broth. Bench assays also evidenced the existence of uncharacterized ‘dark’ decay mechanism(s) not observed in laboratory microcosms. To numerically evaluate the contribution of each mechanism and the uncertainty associated, E. coli decay was modelled assuming dark decay, alkaline pH induced toxicity, and direct sunlight-mediated decay were independent mechanisms. The simulations confirmed E. coli decay was mainly caused by dark decay during bench assays (48.2–89.5% estimated contribution to overall decay at the 95% confidence level), followed by alkaline-pH induced toxicity (8.3–46.5%), and sunlight-mediated decay (0.0–21.9%).

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Section: Resultsmentioning

confidence: 99%

Study from microcosms and mesocosms reveals Escherichia coli removal in high rate algae ponds during domestic wastewater treatment is primarily caused by dark decay

2022

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“…In domestic wastewater, Chlorella sp. removed 99% of Pseudomonas aeruginosa (log inactivation: 2.5), 99% of total coliforms log inactivation: 2.8), 99% of Enterococci (log inactivation: 2.6), and 98% of Escherichia coli (log inactivation: 2.2) [ 41 ]. This remotion of coliforms is related to an increase in pH during the photosynthetic activity.…”

Section: Phycoremediation Of Wastewatermentioning

confidence: 99%

Revalorization of Microalgae Biomass for Synergistic Interaction and Sustainable Applications: Bioplastic Generation

et al. 2022

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Microalgae and cyanobacteria are photosynthetic microorganisms’ sources of renewable biomass that can be used for bioplastic production. These microorganisms have high growth rates, and contrary to other feedstocks, such as land crops, they do not require arable land. In addition, they can be used as feedstock for bioplastic production while not competing with food sources (e.g., corn, wheat, and soy protein). In this study, we review the macromolecules from microalgae and cyanobacteria that can serve for the production of bioplastics, including starch and glycogen, polyhydroxyalkanoates (PHAs), cellulose, polylactic acid (PLA), and triacylglycerols (TAGs). In addition, we focus on the cultivation of microalgae and cyanobacteria for wastewater treatment. This approach would allow reducing nutrient supply for biomass production while treating wastewater. Thus, the combination of wastewater treatment and the production of biomass that can serve as feedstock for bioplastic production is discussed. The comprehensive information provided in this communication would expand the scope of interdisciplinary and translational research.

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“…In addition, when compared to CAS, a reduction of CO2 emissions is expected, mediated by the capture of CO2 by microalgae [22][23][24]. Additionally, the treated effluent from MBC is expected to meet the wastewater discharge and reuse standards [25,26].…”

Section: Introductionmentioning

confidence: 99%

A half-century of research on microalgae-bacteria for wastewater treatment

et al. 2022

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Evaluation of domestic wastewater treatment using microalgal-bacterial processes: effect of CO2 addition on pathogen removal

Cited by 39 publications

References 45 publications

Study from microcosms and mesocosms reveals Escherichia coli removal in high rate algae ponds during domestic wastewater treatment is primarily caused by dark decay

Study from microcosms and mesocosms reveals Escherichia coli removal in high rate algae ponds during domestic wastewater treatment is primarily caused by dark decay

Revalorization of Microalgae Biomass for Synergistic Interaction and Sustainable Applications: Bioplastic Generation

A half-century of research on microalgae-bacteria for wastewater treatment

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