A self-sustaining synergetic microalgal-bacterial granular sludge process towards energy-efficient and environmentally sustainable municipal wastewater treatment

Ji, Bin; Meng, Zhongyan; Gu, Jun; Ma, Yingqun; Liu, Yu

doi:10.1016/j.watres.2020.115884

Cited by 203 publications

(77 citation statements)

References 34 publications

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“…Fifth, modern methods for wastewater treatment like innovative microalgal-bacterial granular sludge process should be adopted to reduce GHGs emissions. It has been reported that 92.69%, 96.84%, and 87.16% of influent organics, ammonia, and phosphorus, respectively, could be removed in this process [94].…”

Section: Discussionmentioning

confidence: 88%

Renewable Energy Consumption, Water Crises, and Environmental Degradation with Moderating Role of Governance: Dynamic Panel Analysis under Cross-Sectional Dependence

Kousar¹,

Ahmed

García

et al. 2020

Sustainability

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This study aims to investigate the relationship between renewable energy consumption, water availability, and environmental degradation with the moderating effect of governance in the South Asian region. This study collected data for renewable energy, water availability, governance, and environmental degradation for the period of 1988 to 2018 from the World Development Indicator. In panel data estimation, if cross-sectional dependence exists, it produces biased estimates. Therefore, this study applied a newly developed technique, dynamic common correlated effect, which produces efficient estimates in the presence of cross-sectional dependence. This study found that foreign direct investment positively and significantly increases environment degradation (β = 0.69 *, * indicates the significance level at less than 1%) while renewable energy and water availability cause to reduce environment degradation (β = −0.08 **, β = −0.09 **, **indicates the significance level at less than 5%). Moreover, the study also found that governance significantly strengthens the relationship of renewable energy and water availability with environment degradation (β = 0.37 **, β = 0.24 **) while governance significantly weakens the relationship of foreign direct investment and environmental degradation (β = −0.34 *). The study suggests that South Asian countries should improve political institutions, and promote renewable energy, water availability, and clean production to improve the environment quality.

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Section: Discussionmentioning

confidence: 88%

Renewable Energy Consumption, Water Crises, and Environmental Degradation with Moderating Role of Governance: Dynamic Panel Analysis under Cross-Sectional Dependence

Kousar¹,

Ahmed

García

et al. 2020

Sustainability

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“…As seen, Gammaproteobacteria attributed to Aquimonas, Acinetobacter, Pseudomonas, Thauera, Clostridia attributed to Proteiniclasticum, Acetoanaerobium, Alphaproteobacteria attributed to Rhizobium, Phreatobacter, Psychroglaciecola and Rhodobacter were predominant prokaryotic microbial community, most of which were heterogenetic bacteria that oxidized organic pollutants and produced CO 2 for microalgae [28]. In addition, nitrifying bacteria were not detected in MBGS, and nitrates and nitrites were not found in water, indicating that NH 4 + -N removal was mainly due to microbial assimilation [12]. As such, nutrient removal at daytime was higher than that at night due to O 2 production from microalgal photosynthesis.…”

Section: The Community Structure Of Mbgsmentioning

confidence: 99%

“…Recently, it was found that the self-coupled MBGS process could remove respective 92.7%, 96.8%, 84.1% and 87.2% of organic matter, ammonia nitrogen, total nitrogen and phosphorus from simulated municipal wastewater under a continuous light condition in 6 h with respective effluent concentrations of 18.3, 0.8, 3.9 and 0.4 mg/L, indicating the excellent potential of the MBGS process [12]. In addition, the MBGS process was highly adaptable to antibiotics and heavy metals in actual wastewater [13,14] thus was extensively used for the treatment of actual municipal wastewater [15,16].…”

Section: Introductionmentioning

confidence: 99%

Microalgal-Bacterial Granular Sludge Process in Non-Aerated Municipal Wastewater Treatment under Natural Day-Night Conditions: Performance and Microbial Community

Wang

Zhu

et al. 2021

Water

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The microalgal-bacterial granular sludge (MBGS) process is expected to meet the future requirements of municipal wastewater treatment technology for decontamination, energy consumption, carbon emission and resource recovery. However, little research on the performance of the MBGS process in outdoor treatment was reported. This study investigated the performance of the MBGS system in treating municipal wastewater under natural alternate day and night conditions in late autumn. The results showed that the average removal efficiencies of Chemical oxygen demand (COD), NH4+-N and PO43−-P on daytime before cooling (stage I, day 1−4) could reach 59.9% ± 6.8%, 78.1% ± 7.9% and 61.5% ± 4.5%, respectively, while the corresponding average removal efficiencies at night were 47.6% ± 8.0%, 56.5% ± 17.9% and 74.2% ± 7.6%, respectively. Due to the dramatic changes in environmental temperature and light intensity, the microbial biomass and system stability was affected with fluctuation in COD and PO43−-P removal. In addition, the relative abundance of filamentous microorganisms (i.e., Clostridia and Anaerolineae) decreased, while Chlorella maintained a dominant position in the eukaryotic community (i.e., relative abundance > 99%). This study can provide a theoretical basis and technical support for the further engineering application of the MBGS process.

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“…The harsh condition of high NaCl concentration might not be conducive to the survival of some microorganism in WAS, which was related to microbial community structure and might lead to shift of dominant bacterial community ( Duan et al, 2016 ). In ecosystem, the functional bacteria distribution is critical to the system functions ( Xin et al, 2015 ; Xu et al, 2018 , 2019 ; Ji et al, 2020 ). In the anaerobic fermentation process, both the biodegradation of dissolved organic matters (DOMs) and the consumption of SCFAs mainly rely on appropriate microbial communities.…”

Section: Introductionmentioning

confidence: 99%

Effect of NaCl Concentration on Microbiological Properties in NaCl Assistant Anaerobic Fermentation: Hydrolase Activity and Microbial Community Distribution

Pang

Xin

et al. 2020

Front. Microbiol.

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Previous studies have demonstrated that sludge hydrolysis and short-chain fatty acids (SCFAs) production were improved through NaCl assistant anaerobic fermentation. However, the effect of NaCl concentrations on hydrolase activity and microbial community structure was rarely reported. In this study, it was found that α-glucosidase activity and some carbohydrate-degrading bacteria were inhibited in NaCl tests, owing to their vulnerability to high NaCl concentration. Correspondingly, the microbial community richness and diversity were reduced compared with the control test, while the evenness was not affected by NaCl concentration. By contrast, the protease activity was increased in the presence of NaCl and reached the highest activity at the NaCl concentration of 20 g/L. The protein-degrading and SCFAs-producing bacteria (e.g., Clostridium algidicarnis and Proteiniclasticum ) were enriched in the presence of NaCl, which were salt-tolerant.

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A self-sustaining synergetic microalgal-bacterial granular sludge process towards energy-efficient and environmentally sustainable municipal wastewater treatment

Cited by 203 publications

References 34 publications

Renewable Energy Consumption, Water Crises, and Environmental Degradation with Moderating Role of Governance: Dynamic Panel Analysis under Cross-Sectional Dependence

Renewable Energy Consumption, Water Crises, and Environmental Degradation with Moderating Role of Governance: Dynamic Panel Analysis under Cross-Sectional Dependence

Microalgal-Bacterial Granular Sludge Process in Non-Aerated Municipal Wastewater Treatment under Natural Day-Night Conditions: Performance and Microbial Community

Effect of NaCl Concentration on Microbiological Properties in NaCl Assistant Anaerobic Fermentation: Hydrolase Activity and Microbial Community Distribution

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