Emerging contaminant degradation and removal in algal wastewater treatment ponds: Identifying the research gaps

Norvill, Zane N.; Shilton, Andy; Guieysse, Benoı̂t

doi:10.1016/j.jhazmat.2016.03.085

Cited by 185 publications

(63 citation statements)

References 152 publications

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“…In addition, microalgae can consume extra phosphorous through a luxury uptake, store it in the form of polyphosphate and utilize it at low external phosphorous conditions (Wu et al, 2012). It has been demonstrated that algae can also absorb heavy metals (Ji et al, 2012), reduce micropollutant content (Norvill et al, 2016) and develop unfavorable ambient conditions for coliform survival (Ansa et al, 2012).…”

Section: General Performancementioning

confidence: 99%

Use of Artificial Aquatic Food-Web for Post-Treatment of Domestic Wastewater in Cold Climate: A Review

Lavrinovičs

Juhna

2017

Journal of Water Security

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Abstract. Eutrophication-promoting phosphorous loads originating from wastewater treatment plants are commonly controlled by chemical precipitation in the tertiary treatment phase. However, this approach is costly and generates additional waste. Therefore, inexpensive and sustainable methods for wastewater post-treatment are wanted. The artificial aquatic food-web that performs wastewater phycoremediation by algae and subsequent biomass harvest by filter-feeding organisms not only requires low energy consumption but also produces biomass for treatment process cost recovery. Still, the knowledge on its performance at different scales and under different climates are limited. In this review, the application possibilities of the artificial aquatic food-web for domestic wastewater post-treatment is discussed, focusing on its use in cold climate regions. Considering the reduced biological activity of aquatic organisms at low ambient temperature, possible solutions for its performance and prospect application at low temperatures are suggested. Finally, directions for future research regarding the practical use of artificial aquatic food-web are highlighted.

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Section: General Performancementioning

confidence: 99%

Use of Artificial Aquatic Food-Web for Post-Treatment of Domestic Wastewater in Cold Climate: A Review

Lavrinovičs

Juhna

2017

Journal of Water Security

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“…It was interesting that CIPX did not exhibit any sorption-based removal when sorption accounted for roughly 10% of algae-mediated estrogen removal (Zhang et al, 2014). However, this result is not unexpected since previous studies have shown that the sorption of a chemical to algal biomass and activated sludge varies greatly in different systems and is largely dependent on minute deviations in physical parameters such as temperature, pH, and light that affect the chemical parameters of the sorbents, solids, and medium (Norvill et al, 2016). However, known chemical parameters of the compounds can be used to speculate reasons for the removal observations.…”

Section: Analysis Of Cipx Removal Mechanismsmentioning

confidence: 57%

“…The algae cells had not been previously exposed to CIPX for any duration, but in a real flow-through system, it is expected that the algae may become acclimated to the presence of CIPX at low concentrations. Such acclimation, as made evident by development of antibiotic resistance, has been widely observed for various bacteria (Norvill et al, 2016;Al-Ahmad et al, 1999;Berendonk et al, 2015;Rizzo et al, 2013). If the algae could become similarly acclimated, it could further reduce the impact of CIPX on algae growth rate at environmentally-relevant concentrations.…”

Section: Assessing the Impact Of Cipx On Algae Growth Ratementioning

confidence: 93%

“…This is not unexpected based on classical microbial growth models and previous measurements in our lab (Zhang et al, 2014). Thus, there is no indication that CIPX has an immediately drastic adverse impact on the algae's growth, even though it and other antibiotics are designed to kill microorganisms, specifically Gram-positive and Gram-negative bacteria (Norvill et al, 2016).…”

Section: Assessing the Impact Of Cipx On Algae Growth Ratementioning

confidence: 99%

“…Based on previous work (Zhang et al, 2014;Norvill et al, 2016;Batchu et al, 2014;Ren et al, 2016;Challis et al, 2014) it was anticipated that CIPX might be removed by some combination of sorption, biotransformation, and photo-transformation. The extent to which each of these mechanisms contributes to CIPX apparent removal is of interest, because they result in different outputs that are then released to the environment.…”

Section: Analysis Of Cipx Removal Mechanismsmentioning

confidence: 99%

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Evaluating Algae-mediated Removal of Ciprofloxacin

Grimes¹

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In this thesis, bench-scale laboratory experiments were used to evaluate the efficacy of an algae-based treatment process to remove ciprofloxacin (CIPX), a highly-prescribed human and veterinary antibiotic for treatment of bacterial infections. As a result of its widespread use, CIPX has been frequently detected in wastewater treatment plant (WWTP) influents and effluents, but it is unknown to what extent its presence affects organisms in receiving waters and natural systems downstream. Previous studies have shown that algae are able to effectively remove estrogens from artificially spiked growth medium. Based on this observation, it is hypothesized that algae may also remove other priority emerging contaminants; e.g., antibiotics, including CIPX. If so, the integrated algae-treatment system could improve WWTP effluent water quality while also providing energy to the WWTP through anaerobic digestion of the algae biomass into methane-derived electricity.We examined the behavior and fate of CIPX under simulated algae cultivation conditions, using the model freshwater alga, Scenedesmus dimorphus. First, we analyzed biomass production of S. dimorphus during exposure to different concentrations of CIPX (0-5000 ng/L) over 192 hours. Interestingly, a dual effect was observed, whereby CIPX at an artificially high experimental concentration (5000 ng/L) was found to stimulate growth, while CIPX at lower environmentally relevant concentrations (0-600 ng/L) were found to inhibit cumulative algae growth. However, little to no impact on algae growth rate was observed within the first 24-48 hours of experimentation. Since it is anticipated that commercial-scale algaetreatment systems will use hydraulic residence times (HRT) on the order of 24 hours, the presence of CIPX in wastewater effluents is expected to have little to no observable impacts on algae productivity.2 Second, we examined removal of CIPX as mediated by S. dimorphus. Appropriate controls were used to assist in allocating apparent removal among several possible removal mechanisms reported in literature: sorption, photolysis (i.e., light-mediated transformation), and algae-mediated biotransformation. Results show an average of 65% removal of CIPX over 8 days, mostly occurring within the first 24 hours. In contrast, negligible CIPX removal was observed in "dark reactors" and "light controls." These data rule out CIPX disappearance as an experimental artifact, and suggest that photolysis is not a significant contributor to CIPX removal under algae cultivation conditions. Negligible CIPX removal was also observed in foil-wrapped controls comprising autoclave-inactivated (i.e., dead) algae. This suggests that sorption is also not a significant contributor to CIPX removal in this system. As such, CIPX removal under the tested conditions is dominated by biotransformation reactions mediated by active algae biomass. This is consistent with previous investigations of algae-mediated removal of steroid estrogens (17α-estradiol, 17β-estradiol, estrone, and estriol); m...

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Microalgal cultivation with waste streams and metabolic constraints to triacylglycerides accumulation for biofuel production

Champagne

Plaxton

et al. 2016

Biofuels Bioprod Bioref

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BUSINESS HIGHLIGHTS 239 Global impacts of the bioeconomy | Missed opportunity | Believing in biofuels | Praising Trump | Funding opportunity available | Utilizing waste | More research into algae | Avoiding iLUC TECHNOLOGY NEWS 242 New yeast strain boosts lipid production | The fresh smell of pinene FEATURE 243 Interactive posters: A valuable means of enhancing communication and learning about productive paths toward sustainable bioenergy ERRATUM 396 Erratum The cover image, by Shijian Ge et al., is based on the Review Microalgal cultivation with waste streams and metabolic constraints to triacylglycerides accumulation for biofuel production,

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Emerging contaminant degradation and removal in algal wastewater treatment ponds: Identifying the research gaps

Cited by 185 publications

References 152 publications

Use of Artificial Aquatic Food-Web for Post-Treatment of Domestic Wastewater in Cold Climate: A Review

Use of Artificial Aquatic Food-Web for Post-Treatment of Domestic Wastewater in Cold Climate: A Review

Evaluating Algae-mediated Removal of Ciprofloxacin

Microalgal cultivation with waste streams and metabolic constraints to triacylglycerides accumulation for biofuel production

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