Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Xu, Jie; Wang, Xue; Sun, Shiqing; Zhao, Yongjun

doi:10.1038/s41598-017-11207-y

Cited by 33 publications

(27 citation statements)

References 48 publications

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“…Regarding the comparison between the digestate and BBM in terms of N removal, it was proven that A. protothecoides had the ability to assimilate nitrogen from the liquid digestate. The reduction of the N content in LD results from the process of assimilation of N by A. protothecoides cells, which is utilized for formation of proteins and nucleic acids or synthesis of phospholipids [22]. Similar results were obtained by Wang et al [23], who demonstrated that the total nitrogen content was reduced by 75.7%–82.5% by green microalgae Chlorella sp from digested dairy manure.…”

Section: Discussionsupporting

confidence: 54%

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Liquid Anaerobic Digestate as a Source of Nutrients for Lipid and Fatty Acid Accumulation by Auxenochlorella Protothecoides

2019

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In recent years, there has been growing interest in the biomass of unicellular algae as a source of valuable metabolites. The main limitations in the commercial application of microbial biomass are associated with the costs of production thereof. Maize silage is one of the main substrates used in biogas plants in Europe. The effects of sterilized agricultural liquid digestate (LD) from methane fermentation of maize silage on the growth rates, macro and micronutrient removal efficiency, lipid content, and fatty acid profile in Auxenochlorella protothecoides were investigated. The results indicate that A. prothecoides can proliferate and accumulate lipids with simultaneous reduction of nutrients in the 1:20 diluted liquid digestate. The rate of nitrogen and phosphorus removal from the liquid digestate was 79.45% and 78.4%, respectively. Cells growing in diluted liquid digestate exhibited the maximum lipid content, i.e., 44.65%. The fatty acid profile of A. prothecoides shows a decrease in the content of linolenic acid by 20.87% and an increase in oleic acid by 32.16% in the LD, compared with the control. The liquid digestate changed the content of monounsaturated fatty acids and polyunsaturated fatty acids. The cells of A. protothecoides growing in the liquid digestate were characterized by lower PUFA content and higher MUFA levels.

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Section: Discussionsupporting

confidence: 54%

“…Carbon is one of the most important elements utilized by algae and constituted 46%–50 % of dry microalgal biomass [22]. In the process of methane fermentation, the organic fraction of wastes is converted to CH 4 and CO 2 , which is dissolved into a liquid and generates a bicarbonate-carbonate buffer of an anaerobic liquid [30].…”

Section: Discussionmentioning

confidence: 99%

Liquid Anaerobic Digestate as a Source of Nutrients for Lipid and Fatty Acid Accumulation by Auxenochlorella Protothecoides

2019

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“…Potassium dihydrogen phosphate was applied as the phosphorus source. The influent C/N ratio was adjusted to 5:1 based on [ 30 ], as carbon and nitrogen are the vital nutrients and source of energy for the growth of microorganisms [ 29 ]. This ratio is important for the microorganisms to function at maximum efficiency, resulting in a stable anaerobic digestion process [ 28 , 29 , 31 ].…”

Section: Methodsmentioning

confidence: 99%

“…Samples from two inocula and anaerobic sludge representing different SRTs on Day 1,15,30,45,60,75,90,110,125, and 150, respectively, were analyzed for bacterial and archaeal community composition. The DNA of these samples was extracted using a FAST DNA Spin Kit for Soil (MP Biomedicals, Solon, OH, USA) according to the manufacturer's instructions.…”

Section: Microbial Community Analysismentioning

confidence: 99%

Effects of Solids Retention Time on the Anaerobic Membrane Bioreactor with Yttria-Based Ceramic Membrane Treating Domestic Wastewater at Ambient Temperature

Nilusha

Zhang

et al. 2020

Membranes

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The effects of solid retention times (SRTs) (100 days, 50 days, 25 days) on the performance, microbial community, and membrane fouling of a lab-scale anaerobic yttria-based ceramic membrane bioreactor (AnCMBR) treating synthetic domestic wastewater at ambient temperature (31.2 ± 2.7 °C) were examined. The soluble chemical oxygen demand (SCOD) removal was higher (89.6%) at 25 days SRT compared with 50 days (39.61%) and 100 days (34.3%) SRT. At 100 days SRT, more Bacteroidetes, Firmicutes, and Proteobacteria were present in the microbial community. At 25 days SRT, more Chloroflexi, Synergistetes, and Pastescibacteria emerged, contributing to the stable performance. The SRT of 25 days has resulted in a more stable microbial community compared with 50 days and 100 days SRT. Both bacterial and archaeal community diversities were higher at 25 days SRT, and the specific production of soluble microbial by-products (SMPs) and extracellular polymeric substances (EPSs) were higher at 25 days SRT as well. Consequently, the membrane flux was lower at 25 days SRT with the increased particle size and the enhanced SMPs and EPSs production. Fourier transform infrared spectroscopy analysis (FTIR) and three-dimensional excitation and emission matrix (3D-EEM) analysis showed that protein and SMPs were the major membrane foulants at all SRT stages. In this study, SRT at 25 days was favorable for the stable operation of an AnCMBR treating domestic wastewater at ambient temperature.

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“…C is a basal element for microalgal growth and contributes up to about 50% of microalgal biomass (Xu, Wang, Sun, Zhao, & Hu, 2017). A previous study accessed the carbon mass balance and reported the assimilation into biomass as the main C removal pathway (Serejo et al, 2015).…”

Section: Nutrient Removalmentioning

confidence: 99%

Influence of three microalgal‐based cultivation technologies on different domestic wastewater and biogas purification in photobioreactor

Sun

Gao

et al. 2019

Water Environment Research

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To investigate the effects of different microalgae and culture methods on the purification of domestic wastewater and biogas, Chlorella vulgaris and Scenedesmus obliquus were selected. Three different culture methods (monoculture, microalgal–fungi cocultivation, and microalgal‐activated sludge cocultivation) were used to remove nutrients from four different domestic wastewaters and remove CO2 from raw biogas in a photobioreactor. The results show that the effluent from the centrate of pretreated urban wastewater (WW4) achieved the highest nutrient and CO2 removal efficiency. Cocultivation of C. vulgaris and activated sludge achieved the highest COD, TP, and CO2 removal efficiencies of 79.27%, 81.25%, and 60.39% with WW4, respectively. Cocultivation of C. vulgaris and fungi achieved the highest TN removal efficiency of 78.46% with WW4. The contents of C, N, and P in the microalgal‐activated sludge symbiont after treatment exceeded 50%, 8%, and 0.8%, respectively. Highly economically efficient energy consumption was achieved with WW4 for both C. vulgaris and S. obliquus. Microalgal‐activated sludge cocultivation was identified as the optimal option for the simultaneous purification of wastewater and biogas based on its high pollution and CO2 removal efficiency. This provides a reference for the microalgal‐based purification of actual domestic wastewater and raw biogas. Practitioner points Nutrient and CO2 were efficiently removed by C. vulgaris with activated sludge. CO2 was removed up to 60.4% and was economically viable. Cocultivation of C. vulgaris and fungi could achieve the highest TN removal with WW4.

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Effects of influent C/N ratios and treatment technologies on integral biogas upgrading and pollutants removal from synthetic domestic sewage

Cited by 33 publications

References 48 publications

Liquid Anaerobic Digestate as a Source of Nutrients for Lipid and Fatty Acid Accumulation by Auxenochlorella Protothecoides

Liquid Anaerobic Digestate as a Source of Nutrients for Lipid and Fatty Acid Accumulation by Auxenochlorella Protothecoides

Effects of Solids Retention Time on the Anaerobic Membrane Bioreactor with Yttria-Based Ceramic Membrane Treating Domestic Wastewater at Ambient Temperature

Influence of three microalgal‐based cultivation technologies on different domestic wastewater and biogas purification in photobioreactor

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