Centrate wastewater treatment with Chlorella vulgaris : Simultaneous enhancement of nutrient removal, biomass and lipid production

Ge, Shijian; Qiu, Shuang; Tremblay, Danielle; Viner, Kelsey; Champagne, Pascale; Jessop, Philip G.

doi:10.1016/j.cej.2018.02.058

Cited by 143 publications

(61 citation statements)

References 61 publications

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“…The removal efficiencies of NH4 + -N and TP 361 by C. vulgaris were 98.20% and 68.48%, respectively. Possibly the unusable phosphorus in organic 362 forms resulted in this low TP removal efficiency since C. vulgaris could not utilize them for growth 363 [28]. The removal rates of NH4 + -N and TP in this system was 1418.40 mg‧m -2 ‧day -1 and 70.40 mg‧m -2 ‧ 364 day -1 , respectively, which were significantly higher than the results of a vertical-algae-biofilm reactor…”

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confidence: 73%

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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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confidence: 73%

“…The removal efficiencies of NH 4 + -N and TP by C. vulgaris were 98.20% and 68.48%, respectively. Possibly the unusable phosphorus in organic forms resulted in this low TP removal efficiency since C. vulgaris could not utilize them for growth [28]. [30].…”

Section: Growth Of C Vulgaris In the Reactormentioning

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 biomass concentration was determined gravimetrically by measuring the dry cell weight (DCW) according to APHA methods and the absorbance at 680 nm (optical density OD 680 ) using a spectrophotometer (Hach DR3900). A linear correlation between DCW ( y ) and OD 680 ( x ) was obtained, namely y = 416.07 x + 244.84 ( R 2 = 0.976, n = 26), and subsequently used to estimate DCW for each sample ( n = 101) as done in Ge et al and Wang et al , who also worked with Chlorella as the dominant genus.…”

Section: Methodsmentioning

confidence: 99%

Lab‐scale testing of operation parameters for algae based treatment of piggery wastewater

Marazzi

Bellucci

Fornaroli

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Microalgae–bacteria‐based processes are among the most promising low‐cost technologies to treat livestock wastewaters. The current literature reports the need for pretreatment or dilution of piggery wastewater for adequate microalgal growth. The aim of this study is to optimize the potential of microalgal–bacterial communities to treat undiluted and untreated piggery wastewater by investigating the influence of some operational parameters such as phosphorus and CO2 availability and hydraulic retention time on the nitrogen removal efficiency and biomass productivity. RESULTS The microalgal community (dominated by Chlorella spp.) developed quickly and remained quite stable. The rates of biomass production and NH4‐N removal were 55 ± 30 mg TSS L−1 day−1 and 13 ± 3 mg NH4‐N L−1 day−1 respectively. CO2 adjustment had a positive effect on microalgal growth and NH4‐N removal. CONCLUSION Data confirm the ability of the microalgal–bacterial consortium to grow on undiluted and untreated piggery wastewater under semi‐continuous conditions. Synergy between algae and bacteria seems positive since photosynthesis produces the oxygen needed for ammonia oxidation. © 2019 Society of Chemical Industry

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“…Several studies reported interesting results on the use of different kinds of wastewater as nutrient source for microalgae culturing. Among them: domestic [4], piggery [5,6], and slaughterhouse [7] wastewaters, as well as municipal centrate [8][9][10][11][12]. Microalgae uptake nutrients from wastewater and produce oxygen by photosynthesis.…”

Section: Introductionmentioning

confidence: 99%

Outdoor pilot trial integrating a sidestream microalgae process for the treatment of centrate under non optimal climate conditions

et al. 2019

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This study was carried out to assess the efficiency of a pilot-scale bubble-column reactor to remove nitrogen in centrate from the biosolid dewatering of a municipal wastewater treatment plant whilst producing biomass for agricultural purposes. The column was inoculated with a mixed community of Scenedesmus and Chlorella spp. and operated outdoor in batch for 55 days and in continuous for further 130 days. In continuous, the average daily biomass productivity was 40 ± 62 mg TSS L −1 d −1 and the average NH 4 +-N removal was 20 ± 10 mg L −1 d −1. Nitrification was fostered by photo-oxygenation leading to the oxidation of 34 ± 27% of the incoming ammonia nitrogen. Microalgal and bacterial activity inside the column was analyzed by the Generalized Linear Models in order to understand the main factors affecting the process performances. Microalgal growth was affected positively by the NH 4 +-N content in the influent and negatively by the amount of TSS entering the system, probably due to the competition between microalgae and bacteria for phosphorus and other nutrients. The removal rate of NH 4 +-N was positively affected by NH 4 +-N in (influent concentration) and by pH, whose increase fosters stripping, and decreased for increasing NH 3-N concentrations, responsible for inhibiting nitrifying bacteria. NH 4 +-N oxidation was the result of complex interactions between algae and bacteria and was also affected by flow and solar radiation. No other specific limiting factors have been highlighted. The possibility of improving the process performance by controlling pH, by supplying off-gas as CO 2 additional source, appears as an interesting option. In view of a scale-up, the most relevant expected result would be the energy saving due to the decrease in the oxygen demand for nitrification in the water line. The microalgal biomass grown on centrate was suitable for agricultural use due to its low contamination by heavy metals.

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Centrate wastewater treatment with Chlorella vulgaris : Simultaneous enhancement of nutrient removal, biomass and lipid production

Cited by 143 publications

References 61 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

Lab‐scale testing of operation parameters for algae based treatment of piggery wastewater

Outdoor pilot trial integrating a sidestream microalgae process for the treatment of centrate under non optimal climate conditions

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