Effects of pH on cell growth, lipid production and CO2 addition of microalgae Chlorella sorokiniana

Qiu, Renhe; Gao, Song; Lopez, Paola A.; Ogden, Kimberly L.

doi:10.1016/j.algal.2017.11.004

Cited by 268 publications

(74 citation statements)

References 51 publications

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“…Such density was significantly (P < 0.05) larger than that of pH of 5.0 (309.46 mg•L −1 ) and 7.0 (286.22 mg•L −1 ) as well as the values in Figure 2a (≤ 221 mg•L −1 ). This signified that acidification of the pig urine enhanced the growth of microalgae, which was in consistent with the findings of Qiu et al [11]. They found that biomass productivity increased with decreasing pH.…”

Section: Optimization Of C Vulgaris Growth Conditions In Pig Urinesupporting

confidence: 91%

“…This could affect the photosynthetic processes in chloroplasts, electron transport chain, non-photochemical quenching, as well as the dark respiration [9], which can decrease the chlorophyll-A content and cause cell lysis of the microalgae [2,3]. In addition, high pH (commonly higher than 8.5) in pig urine can also induce the flocculation of microalgal cells [10] and decrease its population growth [11]. Moreover, magnesium is an important growth factor for green microalgae, since it is the central atom of chlorophyll [12], but it is insufficient in pig urine.…”

Section: Introductionmentioning

confidence: 99%

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Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

et al. 2020

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Fresh pig urine is unsuitable for microalgae cultivation due to its high concentrations of NH4+-N, high pH and insufficient magnesium. In this study, fresh pig urine was pretreated by dilution, pH adjustment, and magnesium addition in order to polish wastewater and produce microalgae biomass. Chlorella vulgaris was cultured in an in-house-designed light-receiving-plate (LRP)-enhanced raceway pond to treat the pretreated pig urine in both batch and continuous mode under outdoor conditions. NH4+-N and TP in wastewater were detected, and the growth of C. vulgaris was evaluated by chlorophyll fluorescence activity as well as biomass production. Results indicated that an 8-fold dilution, pH adjusted to 6.0 and MgSO4·7H2O dosage of 0.1 mg·L−1 would be optimal for the pig urine pretreatment. C. vulgaris could stably accumulate biomass in the LRP-enhanced raceway pond when cultured by both BG11 medium and the pretreated pig urine. About 1.72 g·m−2·day−1 of microalgal biomass could be produced and 98.20% of NH4+-N and 68.48% of TP could be removed during batch treatment. Hydraulic retention time of 7-9d would be optimal for both efficient nutrient removal and microalgal biomass production during continuous treatment.

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Section: Optimization Of C Vulgaris Growth Conditions In Pig Urinesupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

et al. 2020

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“…The buffer system is necessary for sustaining the required pH, particularly at neutral or mildly alkaline pH (7.5-8.0), in the microalgal culture medium because high or low pH is detrimental for the vegetative growth as well as the production of value-added products by microalgae [38,39]. In general, Tris and HEPES have been widely used as a buffer for microalgae cultivation [12,29], which are very costly.…”

Section: Discussionmentioning

confidence: 99%

Microalgal-Based Carbon Sequestration by Converting LNG-Fired Waste CO2 into Red Gold Astaxanthin: The Potential Applicability

et al. 2019

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The combinatorial approach of anthropogenic activities and CO2 sequestration is becoming a global research trend to alleviate the average global temperature. Although microalgae have been widely used to capture CO2 from industrial flue gas, the application of bioproducts was limited to bioenergy due to the controversy over the quality and safety of the products in the food and feed industry. Herein, the waste CO2 emitted from large point sources was directly captured using astaxanthin-hyperproducing microalgae Haematococcus pluvialis. Astaxanthin production was successfully carried out using the hypochlorous acid water-based axenic culture process under highly contamination-prone outdoor conditions. Consequently, after 36 days of autotrophic induction, the productivity of biomass and astaxanthin of H. pluvialis (the mutant) reached 0.127 g L−1 day−1 and 5.47 mg L−1 day−1 under high summer temperatures, respectively, which was 38% and 48% higher than that of wild type cell. After grinding the wet astaxanthin-enriched biomass, the extract was successfully approved by compliance validation testing from Korea Food and Drug Administration. The assorted feed improved an immune system of the poultry without causing any side effects. The flue gas-based bioproducts could certainly be used for health functional food for animals in the future.

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“…Literatür Verileri Kaynaklar pH 5,8-9 [18], [19] Sıcaklık ( o C) 25-36 [20], [21], [22] Tuzluluk (g/l) 15-150 [23] Işık Yoğunluğu (µmol m -2 s -1 ) 90-360 [24], [22] Işıklanma Süresi (gündüz: gece) (h) 12/12 24/0 [20], [25] [25]…”

Section: Parametrelerunclassified

Sustainable and Eco-Friendly Raw Materials for Biofuels: Microalgae

Eleren¹,

Öner²

2019

Pamukkale J Eng Sci

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Son yıllarda petrol rezervlerinin hızlı tüketilmesi ve buna bağlı olarak meydana gelen sera gazlarının çevre üzerinde olumsuz etkileri neticesinde, endüstriyel ekonomi ve toplum tüketimi için sürdürülebilir ve çevre dostu alternatif enerji kaynağı olan mikroalgler ön plana çıkmıştır. Bu çalışma kapsamında, biyoyakıt üretim proseslerinin seçimini etkileyen mikroalglerin kimyasal kompozisyonu, mikroalg kültürü yetiştirilmesini etkileyen faktörler, kültür yetiştirmede kullanılan sistemler, biyoyakıt üretim prosesleri ve ekonomik analizleri incelenmiştir. Mikroalglerin içeriği, dönüştürme proseslerini etkilemekte ve elde edilen biyoyakıtlar farklılık göstermektedir. Bu inceleme neticesinde, mikroalgler kullanılarak biyodizel, biyoetanol, metan ve mikroalg kalıntılarının yakılması veya gazlaştırılması ile ısı ve elektrik üretiminin söz konusu olabileceği tespit edilmiştir. Mevcut teknolojiler ile biyoyakıt üretimi için alg yetiştirilmesinin tam ölçekli uygulamaları oldukça pahalıdır. Alg üretim maliyetlerini azaltmak için bölgesel enerji santralleri veya endüstriyel baca gazı ve atıksu arıtma tesisleri etkili ve entegre bir şekilde kullanılabilir.Microalgae, a sustainable and environmentally friendly alternative energy source for the industrial economy and community consumption, has come to the forefront in recent years due to the rapid depletion of oil reserves and consequent negative effects of greenhouse gases on the environment. In this study, the chemical composition of microalgae affecting the selection of biofuel production processes, factors affecting microalgae cultivation, cultivated systems, biofuel production processes and its economic analysis are examined. The content of microalgae affects the conversion processes, and the obtained biofuels from microalgae show differences. As a result of this investigation, it has been concluded that the heat and electricity production may be obtained from burning or gasification of microalgae residues. Biodiesel, bioethanol and methane can also be produced using microalgae. The full-scale applications of algae cultivation for biofuel production with existing technologies are quite expensive. To reduce algal production costs, the regional power plants or the industrial flue gas and the wastewater treatment plants should be used in an effectively and integrally.

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Effects of pH on cell growth, lipid production and CO2 addition of microalgae Chlorella sorokiniana

Cited by 268 publications

References 51 publications

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

Microalgal-Based Carbon Sequestration by Converting LNG-Fired Waste CO2 into Red Gold Astaxanthin: The Potential Applicability

Sustainable and Eco-Friendly Raw Materials for Biofuels: Microalgae

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