Treatment of high-nitrate wastewater mixtures from MnO2 industry by Chlorella vulgaris

Li, Huan; Zhang, Yun; Liu, Jiuyi; Shen, Zhensheng; An, Li; Ma, Tian; Feng, Qian; Sun, Yingqiang

doi:10.1016/j.biortech.2019.121836

Cited by 38 publications

(14 citation statements)

References 47 publications

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“…[12,13] Besides the valuable bio-oil products, the inorganic nutrients of microalgae are transformed into water soluble nutrients during HTL process, which can be recycled for algae growth. [14,15] However, the HTL of microalgae is still far away from practical application since it is an energyintensive process with low biofuel yield. [16] Additionally, unlike the terrestrial plant, microalgae are rich in proteins, which are thermo-decomposed into amino acid and subsequently transformed into N-containing polycyclic aromatic compounds through the Maillard reactions between amino acid and reducing carbohydrates.…”

Section: Introductionmentioning

confidence: 99%

“…During the HTL of microalgae, their cellular compounds including lipids, proteins, and carbohydrates are converted into bio‐oil, water soluble nutrients, gases, and residues, through hydrolysis of cellular compositions into monomers, deamination, decarboxylation and dehydration of the monomers, and the following tandem reaction including cyclization, condensation and repolymerization of the fragments [12,13] . Besides the valuable bio‐oil products, the inorganic nutrients of microalgae are transformed into water soluble nutrients during HTL process, which can be recycled for algae growth [14,15] . However, the HTL of microalgae is still far away from practical application since it is an energy‐intensive process with low biofuel yield [16] .…”

Section: Introductionmentioning

confidence: 99%

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Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Shen

Long

et al. 2020

ChemSusChem

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Hydrothermal liquefaction (HTL) of microalgae for biofuel production is suffering from low bio-oil yield and high heteroatomic compositions owing to their low efficiency and selectivity to hydrolysis of cellular compounds. Hereby we report Keggin-type (MoÀ VÀ P) heteropolyacids (HPAs)-catalyzed HTL of microalgae for efficient low-nitrogen biocrude production. The increases of reaction temperature, reaction time, and vanadium substitution degrees of HPAs are favorable to biocrude yield initially, whereas a significant decrease of biocrude yield is observed owing to the enhanced oxidation of carbohydrates above the optimum reaction conditions. The maximum biocrude yield of HPAs-catalyzed HTL of microalgae is 29.95 % at reaction temperature of 300°C, reaction time of 2 h, and 5 wt% of HPA-4, which is about 19.66 % higher than that of control with 71.17 % less N-containing compounds, including 1,3-propanediamine, 1-pentanamine, and 2, 2'heptamethylene-di-2-imidazoline than that of control. This work reveals that HPAs with Brønsted acidity and reversible redox properties are capable of both enhancing biocrude production via catalyzing the hydrolysis of cellular compounds and reducing their nitrogen content through avoiding the Maillard reactions between the intermediates of hydrolysis of carbohydrates and proteins. HPAs-catalyzed HTL is an efficient strategy to produce low N-containing biofuels, possibly paving the way of their direct use in modern motors.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Shen

Long

et al. 2020

ChemSusChem

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“…Another microalgae, P. typicum, had an absorbance at 3.31 mg/ L Pb 2+ concentration of 70% [70]. Li et al [71] found that the removal rate of Ca, Zn, and Mn in industrial high nitrate nitrogen wastewater by Chlorella reached 97.91%, 99.37%, and 99.44%, respectively. The results show that microalgae can effectively adsorb metal ions, and the main mechanism is the combination of negative charged groups in cell wall with positively charged metal ions [72].…”

Section: Assess the Impact Of Microalgae On The Natural Environment And Social Benefitsmentioning

confidence: 99%

A Review on the Effect from Steel Slag on the Growth of Microalgae

Liu

Cai

et al. 2021

Processes

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As a by-product from the metallurgical industry, steel slag contains a large amount of metal elements. In many developing countries, the output of steel slag is huge and the comprehensive utilization rate is low, hence the development of a novel application method for steel slag is of great significance to increase its utilization rate to improve the environment. This paper reviewed the dissolution behavior of Fe, P, Ca and silicate of steel slag under seawater and acidic solutions as an application in the cultivation of different microalgae, such as diatoms, spirulina, and chlorella. This review clarifies that proper pre-treatment of steel slag can effectively increase the dissolved elements of steel slag in the solution and provide more nutrients for the growth of microalgae. Microalgae cultivated with steel slag as a nutrient can be used to produce biodiesel which has a very broad application prospects for cleaner production and environmental protection.

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“…Neubauer chamber is currently used as a standard in the laboratories for manual counting under a light microscope [38] Automatic cell counting To overcome manual counting limitations, advanced digital image analysis has been promoted [39] Biomass quantification Centrifugation, dried, weight…”

Section: Neubauer Cell Countingmentioning

confidence: 99%

Aquatic Toxicity of Photocatalyst Nanoparticles to Green Microalgae Chlorella vulgaris

Adochite

Andronic

2020

Water

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In the last years, nanoparticles such as TiO2, ZnO, NiO, CuO and Fe2O3 were mainly used in wastewater applications. In addition to the positive aspects concerning using nanoparticles in the advanced oxidation process of wastewater containing pollutants, the impact of these nanoparticles on the environment must also be investigated. The toxicity of nanoparticles is generally investigated by the nanomaterials’ effect on green algae, especially on Chlorella vulgaris. In this review, several aspects are reviewed: the Chlorella vulgaris culture monitoring and growth parameters, the effect of different nanoparticles on Chlorella vulgaris, the toxicity of photocatalyst nanoparticles, and the mechanism of photocatalyst during oxidative stress on the photosynthetic mechanism of Chlorella vulgaris. The Bold basal medium (BBM) is generally recognized as an excellent standard cultivation medium for Chlorella vulgaris in the known environmental conditions such as temperature in the range 20–30 °C and light intensity of around 150 μE·m2·s−1 under a 16/8 h light/dark cycle. The nanoparticles synthesis methods influence the particle size, morphology, density, surface area to generate growth inhibition and further algal deaths at the nanoparticle-dependent concentration. Moreover, the results revealed that nanoparticles caused a more potent inhibitory effect on microalgal growth and severely disrupted algal cells’ membranes.

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Treatment of high-nitrate wastewater mixtures from MnO2 industry by Chlorella vulgaris

Cited by 38 publications

References 47 publications

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

Keggin‐type Heteropolyacids‐Catalyzed Selective Hydrothermal Oxidation of Microalgae for Low Nitrogen Biofuel Production

A Review on the Effect from Steel Slag on the Growth of Microalgae

Aquatic Toxicity of Photocatalyst Nanoparticles to Green Microalgae Chlorella vulgaris

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