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Eloi Parladé, Andrea Hom-Diaz, Paqui Blánquez, Maira Martínez-Alonso, Teresa Vicent, Nuria Gaju
The use of microalgal consortia for urban wastewater treatment is an increasing trend, as it allows simultaneous nutrient removal and biomass production. Emerging contaminants proposed for the list of priority substances such as the hormone 17β-estradiol are commonly found in urban wastewater, and their removal using algal monocultures has been accomplished. Due to the inherent potential of algae-based systems, this study aimed to assess the capability of native photobioreactor biomass to remove 17β-estradiol under indoor and outdoor conditions...
March 3, 2018: Water Research
Irena Branyikova, Monika Filipenska, Katerina Urbanova, Marek C Ruzicka, Martin Pivokonsky, Tomas Branyik
Alkaline flocculation has been studied due to its potential as a low-cost harvesting method for microalgae. However, surface properties (zeta potential, contact angles) as inputs into physicochemical interaction models have not yet been applied systematically. In this work, forced alkaline flocculation of the freshwater microalgae Chlorella vulgaris induced by calcium phosphate precipitates was studied as a model system. Response surface methodology was used to quantify the effect of independent variables (concentration of Ca2+ (0...
March 6, 2018: Colloids and Surfaces. B, Biointerfaces
Pengfei Guo, Yuejin Zhang, Yongjun Zhao
Abstract : Co-cultivation of microalgae and microbes for pollutant removal from sewage is considered as an effective wastewater treatment method. The aim of this study is to screen the optimal photoperiod, light intensity and microalgae co-cultivation method for simultaneously removing nutrients in biogas slurry and capturing CO₂ in biogas. The microalgae-fungi pellets are deemed to be a viable option because of their high specific growth rate and nutrient and CO2 removal efficiency under the photoperiod of 14 h light:10 h dark...
March 15, 2018: International Journal of Environmental Research and Public Health
Suchi Srivastava, Sonal Srivastava, Vidisha Bist, Surabhi Awasthi, Reshu Chauhan, Vasvi Chaudhry, Poonam C Singh, Sanjay Dwivedi, Abhishek Niranjan, Lalit Agrawal, Puneet Singh Chauhan, Rudra Deo Tripathi, Chandra Shekhar Nautiyal
Rice grown in arsenic (As) contaminated areas contributes to high dietary exposure of As inducing multiple adverse effects on human health. The As contamination and application of phosphate fertilizers during seedling stage creates a high P and As stress condition. The flooded paddy fields are also conducive for algal growth and microbial activity. The present study proposes potential role of microalgae, Chlorella vulgaris (CHL) and bacteria, Pseudomonas putida (RAR) on rice plant grown under excess As and phosphate (P) conditions...
February 23, 2018: Journal of Hazardous Materials
Xiaoyu Wang, Yuan Zhao, Xiaoxue Jiang, Lijun Liu, Xue Li, Huixian Li, Wenyan Liang
Plant polyphenol (PP), a natural polymer from the Larix gmelinii, was selected as the surfactant to synthesize Fe3 O4 . The Fe3 O4 -PP composite was prepared by in-situ self-assembly in solvothermal synthesis, and characterized using FE-SEM, TEM, XRD, FTIR, XPS, TGA, and VSM. The harvesting efficiency of Chlorella vulgaris was investigated under different parameters, including algal organic matter, dosage, and pH. The results showed that the core-shell sphere of Fe3 O4 -PP (∼150 nm) was coated by ∼50 nm PP with a saturated magnetization of 40...
March 10, 2018: Journal of Environmental Management
Xueqing Shi, Tsuey Shan Yeap, Shujuan Huang, Jianqiu Chen, How Yong Ng
A green microalga Chlorella sp. isolated from marine environment was investigated for its potential to pretreat saline antibiotic wastewater containing amoxicillin (AMX). Through Biolog EcoPlate assay, the Chlorella sp. showed its unique carbon source metabolic patterns under autotrophic condition. In addition, the microalga could effectively remove AMX (>99%) under initial AMX concentrations ranging from 10 to 150 mg/L through a treatability test. In the continuous AMX treatment using a lab-scale membrane photobioreactor (MPBR), a stable AMX removal efficiency of 85...
February 24, 2018: Bioresource Technology
Jean Claude Nzayisenga, Karolina Eriksson, Anita Sellstedt
The biomass production and changes in biochemical composition of a locally isolated microalga (Chlorella sp.) were investigated in autotrophic, mixotrophic and heterotrophic conditions, using glucose or glycerol as carbon sources and municipal wastewater as the growth medium. Both standard methods and Multivariate Curve Resolution-Alternating Least Squares (MCR-ALS) analysis of data acquired by Fourier-transform IR (FTIR) spectrometry showed that autotrophic and mixotrophic conditions promoted carbohydrate accumulation, while heterotrophic conditions with glycerol resulted in the highest lipid content and lowest carbohydrate content...
March 7, 2018: Bioresource Technology
Stéphane Pfendler, Thomas Munch, Faisl Bousta, Laurence Alaoui-Sosse, Lotfi Aleya, Badr Alaoui-Sossé
Green microalgae colonizing stone surfaces represent a major problem for the conservation of heritage monuments, since they lead to biodegradation and aesthetic issues. Previous studies in La Glacière show cave (France) have demonstrated that UV-C may have a strong effect on microalgae, thus leading to chlorophyll bleaching, which was increased when biofilms were maintained under VIS-light condition unlike to those maintained in the dark. To understand the physiological mechanisms underlying this response and in order to optimize in situ treatment, 30 kJ m-2 UV-C exposure times were applied to Chlorophyta Chlorella sp...
March 8, 2018: Environmental Science and Pollution Research International
Adriano Evandir Marchello, Alexsandro Claudino Dos Santos, Ana Teresa Lombardi, Clovis Wesley Oliveira de Souza, Graziela Cristina Montanhim
Mixotrophy is a metabolic strategy in which an organism is autotrophic and heterotrophic simultaneously. Considering that the aquatic environment provides several organic sources of carbon, it is probably common for microalgae to perform mixotrophy and not only photoautotrophy, but little is known about microalgae mixotrophy. The present work aimed at investigating the growth, photosynthetic activity, morphology, and biochemical composition of the microalga Chlorella sorokiniana in mixotrophic and photo-mixotrophic conditions, comparing it with photoautotrophy...
March 8, 2018: Microbial Ecology
Min Jung Kim, Jae Ryoun Youn, Young Seok Song
Extracellular polymeric substances (EPSs) are self-produced biosynthetic macromolecules that have a three-dimensional architecture in bacterial biofilms and are mainly composed of a mixture of polysaccharides, proteins and nucleic acids. Compared with synthetic polymers, EPSs can have a long relaxation time due to their structural complexity. We exploited the non-Newtonian rheological behavior of EPSs extracted from Chlorella vulgaris with the help of cell focusing and particle focusing in confined microchannels...
March 6, 2018: Lab on a Chip
Moise M Matouke, Dorcas T Elewa, Karimatu Abdullahi
The wide application of titanium dioxide nanoparticles and phosphorus in the manufacturing of many industrial products mainly used in agricultural sector has resulted in the release of considerable amounts of these compounds into freshwater aquatic ecosystem. These compounds may cause some unexpected effects to aquatic organisms. This study assessed the binary effects of Titanium nanoparticles (nTiO2 ) and Phosphorus on Chlorella ellipsoides. Toxicological assay test of the compounds nTiO2 (1.25 μM) alone and the combination of Titanium dioxide (1...
February 14, 2018: Aquatic Toxicology
Ying Shen, Wenzhe Zhu, Huan Li, Shih-Hsin Ho, Jianfeng Chen, Youping Xie, Xinguo Shi
A complex of water-hyacinth derived pellets immobilized with Chlorella sp. was applied, for the first time, in the bioremediation of Cadmium (Cd). The Cd(II) removal efficiency of the complex was optimized by investigating several parameters, including the pellet materials, algal culture age, and light intensity. Results showed that the Cd(II) removal efficiency was positively related to the algal immobilization efficiency and the algal bioaccumulation capacity. Since higher surface hydrophilicity leads to higher immobilization efficiency, the water-hyacinth leaf biochar pellet (WLBp) was selected as the optimal carrier...
February 15, 2018: Bioresource Technology
Yu-Jen Chao, Wen-Hsin Wu, Maria Balazova, Ting-Yuan Wu, Jamie Lin, Yi-Wen Liu, Yuan-Hao Howard Hsu
The zebrafish (Danio rerio) is an important and widely used vertebrate model organism for the study of human diseases which include disorders caused by dysfunctional mitochondria. Mitochondria play an essential role in both energy metabolism and apoptosis, which are mediated through a mitochondrial phospholipid cardiolipin (CL). In order to examine the cardiolipin profile in the zebrafish model, we developed a CL analysis platform by using liquid chromatography-mass spectrometry (LC-MS). Meanwhile, we tested whether chlorella diet would alter the CL profile in the larval fish, and in various organs of the adult fish...
2018: PloS One
F Iasimone, G Zuccaro, V D'Oriano, G Franci, M Galdiero, D Pirozzi, V De Felice, F Pirozzi
A mixed culture of oleaginous yeast Lipomyces starkeyi and wastewater native microalgae (mostly Scenedesmus sp. and Chlorella sp.) was performed to enhance lipid and biomass production from urban wastewaters. A 400 L raceway pond, operating outdoors, was designed and used for biomass cultivation. Microalgae and yeast were inoculated into the cultivation pond with a 2:1 inoculum ratio. Their concentrations were monitored for 14 continuous days of batch cultivation. Microalgal growth presented a 3-day initial lag-phase, while yeast growth occurred in the first few days...
February 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Lingui Xue, Hai Shang, Ping Ma, Xia Wang, Xiaoyan He, Junbo Niu, Juanli Wu
The aim was to study the effect of artificially constructed consortia of microalgae-bacterial symbionts on growth and lipid production by Chlorella vulgaris (C. vulgaris), as well as the inter-relationship between microalgae and bacterial in a photoautotrophic system. The results showed that compared to an axenic culture of C. vulgaris, H1 co-culture system (axenic C. vulgaris-Stenotrophomona smaltophilia) had the strongest effect on the C. vulgaris growth. The biomass, specific growth rate and maximum productivity of C...
February 28, 2018: Journal of Basic Microbiology
Lisa A Golding, Kitty McKnight, Monique Binet, Merrin Adams, Simon C Apte
Barium is present at elevated concentrations in oil and gas produced waters (PWs) and has no international water quality guideline value to assess the potential risk of adverse effects to aquatic biota. Sulfate concentration largely controls the solubility of barium in aquatic systems with insoluble barium sulfate (barite) assumed to be less bioavailable and less toxic than dissolved barium. We exposed aquatic biota to dissolved barium only and to a mixture of dissolved and precipitated barium. The chronic dissolved barium 48-h growth rate inhibition EC10 and EC50 values for the tropical freshwater alga Chlorella sp...
February 5, 2018: Environmental Toxicology and Chemistry
Yiqi Jiang, Hong Wang, Wannan Wang, Liangwei Deng, Wenguo Wang
Liquid digestate (LD) is highly turbid and contains ammonium (NH4 + -N), which negatively influences microalgal growth. Therefore, a method of reducing LD turbidity and NH4 + -N content is proposed, using struvite precipitation. To obtain struvite precipitation supernatant with an ideal UV transmittance, NH4 + -N concentration, and N/P ratio for microalgal growth, the effects of pH and the molar ratio of NH4 + /Mg2+ /PO4 3- were studied. Results show that the optimal NH4 + /Mg2+ /PO4 3- molar ratio was 1:1...
February 26, 2018: Environmental Science and Pollution Research International
Pei-Gao Duan, Shi-Chang Li, Jia-Li Jiao, Feng Wang, Yu-Ping Xu
Supercritical water gasification (SCWG) of the microalga Chlorella pyrenoidosa was examined with a catalyst mixture of Ru/C and Rh/C in a mass ratio of 1:1. The influences of temperature (380-600°C), water density (0-0.197g/cm3 ), and catalyst loading (0-20wt%) on the yields and composition of the gaseous products and the gasification efficiency were examined. The temperature and water density significantly affected the SCWG of the microalgae. The hydrogen gasification efficiency was more dependent on the temperature, while the carbon gasification efficiency was more dependent on the water density...
February 22, 2018: Science of the Total Environment
E Angulo, L Bula, I Mercado, A Montaño, N Cubillán
In this work, the removal of the Cephalexin by Chlorella sp., nonliving modified by extraction of lipids was evaluated. First, the microalga was grown to completing 20 days and later, the biomass of crop was centrifuged and the extraction of lipids was performed. Two adsorption experiments were performed: (1) with nonliving Chlorella sp. (control), and (2) the obtained biomass after lipid extraction. The high antibiotic removal, 71.19% and 82.77% (control), were obtained at the lowest initial concentration...
February 20, 2018: Bioresource Technology
Yahui Sun, Qiang Liao, Yun Huang, Ao Xia, Qian Fu, Xun Zhu, Jingwei Fu, Jun Li
Considering the variations of optimal light intensity required by microalgae cells along with growth phases, growth-phase light-feeding strategies were proposed and verified in this paper, aiming at boosting microalgae lipid productivity from the perspective of light conditions optimization. Experimental results demonstrate that under an identical time-averaged light intensity, the light-feeding strategies characterized by stepwise incremental light intensities showed a positive effect on biomass and lipid accumulation...
February 13, 2018: Bioresource Technology
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