Influence of microalgal N and P composition on wastewater nutrient remediation

Whitton, Rachel; Mével, Amandine Le; Pidou, Marc; Ometto, Francesco; Villa, Raffaella; Jefferson, Bruce

doi:10.1016/j.watres.2015.12.054

Cited by 153 publications

(81 citation statements)

References 28 publications

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“…The duration of each experiment varied according to the days that the culture was maintained in pseudosteady state ( Table 2) In order to inhibit nitrification, allylthiourea (ATU) was added to the culture to maintain a concentration of 1-5 mgꞏL -1 in the PBRs (González-Camejo et al, 2018a). In addition, the pH set-point value of the culture (7.5) made ammonia volatilisation and phosphorus precipitation be negligible (Whitton et al, 2016) so that microalgae were considered as the main responsible for nutrient recovery.…”

Section: Experimental Periodsmentioning

confidence: 99%

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

González-Camejo

Jiménez-Benítez

Ruano

et al. 2019

Journal of Environmental Management

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The operation of an outdoor membrane photobioreactor plant which treated the effluent of an anaerobic membrane bioreactor was optimised. Biomass retention times of 4.5, 6, and 9 days were tested. At a biomass retention time of 4.5 days, maximum nitrogen recovery rate:light irradiance ratios, photosynthetic efficiencies and carbon biofixations of 51.7 ± 14.3 mg Nꞏmol -1 , 4.4 ± 1.6 % and 0.50 ± 0.05 kg CO2ꞏm 3 influent, respectively, were attained. Minimum membrane fouling rates were achieved when operating at the shortest biomass retention time because of the lower solid concentration and the negligible amount of cyanobacteria and protozoa.Hydraulic retention times of 3.5, 2, and 1.5 days were tested at the optimum biomass retention times of 4.5 days under non-nutrient limited conditions, showing no significant differences in the nutrient recovery rates, photosynthetic efficiencies and membrane fouling rates. However, nitrogen recovery rate:light irradiance ratios and photosynthetic efficiency significantly decreased when hydraulic retention time was 2 further shortened to 1 day, probably due to a rise in the substrate turbidity which reduced the light availability in the culture. Optimal carbon biofixations and theoretical energy recoveries from the biomass were obtained at hydraulic retention time of 3.5 days, which accounted for 0.55 ± 0.05 kg CO2ꞏm -3 influent and 0.443 ± 0.103 kWhꞏm -3 influent, respectively.

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Section: Experimental Periodsmentioning

confidence: 99%

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

González-Camejo

Jiménez-Benítez

Ruano

et al. 2019

Journal of Environmental Management

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“…In addition, the biomass production, growth, and fucoxanthin productivity of P. tricornutum depend on nutrient concentration and the balance between relevant nitrogen and phosphorus (N/P) species in the media (Choi and Lee 2015;Whitton et al 2016;McClure et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Environmental and nutrient conditions influence fucoxanthin productivity of the marine diatom Phaeodactylum tricornutum grown on palm oil mill effluent

et al. 2018

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Palm oil mill effluent (POME) is a type of wastewater posing large problems when discharged in the environment. Yet, due to its high nutrient content, POME may offer opportunities for algal growth and subsequent harvesting of high-value products. The marine diatom Phaeodactylum tricornutum is a potential feedstock diatom for bioactive compounds such as the carotenoid fucoxanthin, which has been shown to have pharmaceutical applications. The aim of this paper was to evaluate the growth and fucoxanthin productivity of P. tricornutum grown on POME, as a function of light intensity, temperature, salinity, and nutrient enrichment. High-saturating irradiance (300 μmol photons m −2 s −1) levels at 25°C showed highest growth rates but decreased the fucoxanthin productivity of P. tricornutum. Box-Behnken response surface methodology revealed that the optimum fucoxanthin productivity was influenced by temperature, salinity, and the addition of urea. Nutrient enrichment by phosphorus did not enhance cell density and fucoxanthin productivity, while urea addition was found to stimulate both. We conclude that POME wastewater, supplemented with urea, can be considered as the potential medium for P. tricornutum to replace commercial nutrients while producing high amounts of fucoxanthin.

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“…However, a significant inverse correlation (p < 0.01) exists between the biomass produced and total nitrogen concentration in the water. Several authors have reported the need for a balanced N:P ratio when using wastewater as the growth medium for microalgae for increased growth and nutrient removal [26,30]. In this study, the total nitrogen concentration far exceeded the total phosphorus concentration at the NWWTW with its optimal N:P of 44.2 exceeding the optimal range of 6.8 to 10 [28].…”

Section: Discussionmentioning

confidence: 65%

Evaluation of Pre-Chlorinated Wastewater Effluent for Microalgal Cultivation and Biodiesel Production

Odjadjare

Mutanda

Chen

et al. 2018

Water

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Microalgae are promising feedstock to produce biodiesel and other value added products. However, the water footprint for producing microalgal biodiesel is enormous and would put a strain on the water resources of water stressed countries like South Africa if freshwater is used without recycling. This study evaluates the utilization of pre-chlorinated wastewater as a cheap growth media for microalgal biomass propagation with the aim of producing biodiesel whilst simultaneously remediating the wastewater. Wastewater was collected from two wastewater treatment plants (WWTPs) in Durban, inoculated with Neochloris aquatica and Asterarcys quadricellulare and the growth kinetics monitored for a period of 8 days. The physicochemical parameters; including chemical oxygen demand (COD), total nitrogen (TN), and total phosphorus (TP) were determined before microalgal cultivation and after harvesting. Total lipids were quantified gravimetrically after extraction by hexane/isopropanol (3:2 v/v). Biodiesel was produced by transesterification and characterised by gas chromatography. The total carbohydrate was extracted by acid hydrolysis and quantified by spectrophotometric method based on aldehyde functional group derivatization. Asterarcys quadricellulare utilized the wastewater for growth and reduced the COD of the wastewater effluent from the Umbilo WWTP by 12.4%. Total nitrogen (TN) and phosphorus (TP) were reduced by 48% and 50% respectively by Asterarcys quadricellulare cultivated in sterile wastewater while, Neochloris reduced the TP by 37% and TN by 29%. Although the highest biomass yield (460 mg dry weight) was obtained for Asterarcys, the highest amount of lipid (14.85 ± 1.63 mg L −1 ) and carbohydrate (14.84 ± 0.1 mg L −1 ) content were recorded in Neochloris aquatica. The dominant fatty acids in the microalgae were palmitic acid (C16:0), stearic acid (C18:0) and oleic acid (C18:1). The biodiesel produced was determined to be of good quality with high oxidation stability and low viscosity, and conformed to the American society for testing and materials (ASTM) guidelines.

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Influence of microalgal N and P composition on wastewater nutrient remediation

Cited by 153 publications

References 28 publications

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

Environmental and nutrient conditions influence fucoxanthin productivity of the marine diatom Phaeodactylum tricornutum grown on palm oil mill effluent

Evaluation of Pre-Chlorinated Wastewater Effluent for Microalgal Cultivation and Biodiesel Production

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