Roles of SRT and HRT of an algal membrane bioreactor system with a tanks-in-series configuration for secondary wastewater effluent polishing

Xu, Meng; Li, Ping; Tang, Tianyu; Hu, Zhiqiang

doi:10.1016/j.ecoleng.2015.09.064

Cited by 101 publications

(40 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Several authors have studied the optimum operating ranges of BRT and HRT for labscale MPBR systems (Gao et al, 2018;Luo et al, 2018;Xu et al, 2015). However, outdoor microalgae cultivation from sewage is affected by environmental conditions in many different ways, such as the variable solar irradiance, ambient temperature and nutrient loads (Foladori et al, 2018;González-Camejo et al, 2018a).…”

mentioning

confidence: 99%

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

González-Camejo

Jiménez-Benítez

Ruano

et al. 2019

Journal of Environmental Management

View full text Add to dashboard Cite

The operation of an outdoor membrane photobioreactor plant which treated the effluent of an anaerobic membrane bioreactor was optimised. Biomass retention times of 4.5, 6, and 9 days were tested. At a biomass retention time of 4.5 days, maximum nitrogen recovery rate:light irradiance ratios, photosynthetic efficiencies and carbon biofixations of 51.7 ± 14.3 mg Nꞏmol -1 , 4.4 ± 1.6 % and 0.50 ± 0.05 kg CO2ꞏm 3 influent, respectively, were attained. Minimum membrane fouling rates were achieved when operating at the shortest biomass retention time because of the lower solid concentration and the negligible amount of cyanobacteria and protozoa.Hydraulic retention times of 3.5, 2, and 1.5 days were tested at the optimum biomass retention times of 4.5 days under non-nutrient limited conditions, showing no significant differences in the nutrient recovery rates, photosynthetic efficiencies and membrane fouling rates. However, nitrogen recovery rate:light irradiance ratios and photosynthetic efficiency significantly decreased when hydraulic retention time was 2 further shortened to 1 day, probably due to a rise in the substrate turbidity which reduced the light availability in the culture. Optimal carbon biofixations and theoretical energy recoveries from the biomass were obtained at hydraulic retention time of 3.5 days, which accounted for 0.55 ± 0.05 kg CO2ꞏm -3 influent and 0.443 ± 0.103 kWhꞏm -3 influent, respectively.

show abstract

mentioning

confidence: 99%

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

González-Camejo

Jiménez-Benítez

Ruano

et al. 2019

Journal of Environmental Management

View full text Add to dashboard Cite

show abstract

“…Though most current algae research focuses on lab-scale experiments, algae reactors are promising for treatment of secondary wastewater effluent. For example, an algae membrane bioreactor can effectively remove approximately 60% of total influent phosphorus for secondary wastewater effluent polishing (Xu et al, 2015;Xu et al, 2016).…”

Section: Challenges and Research Needsmentioning

confidence: 99%

Biological Phosphorus Recovery: Review of Current Progress and Future Needs

Ballent

et al. 2017

Water Environment Research

View full text Add to dashboard Cite

This review summarizes the main species of polyphosphate accumulating organisms (PAOs) and algae, illustrates their pathways and key enzymes, discusses biological phosphorous (P) recovery from dilute waters, and identifies research avenues to encourage adoption and implementation. Phylogenic analysis indicates that the Proteobacteria phylum plays an important role in enhanced biological phosphorus removal (EBPR). The use of meta-transcriptome analysis and single cell-based techniques to help overcome the challenges associated with non-PAO competition was discussed. For algae capable of luxury phosphorus uptake, fundamental research is needed to illustrate the phosphorus regulation process and key proteins involved. Emerging technologies and processes have great potential to further advance phosphorus recovery, including combined PAO/algae reactors, bioelectrochemical systems, and biosorption by phosphorus binding proteins. As the paradigm shifts toward holistic resource recovery, research is needed to explore P+ recovery with other resources (e.g., metals from sludge), using a combination of biological and chemical approaches.

show abstract

“…Wastewater treatment facilities use algae to remove pollutants and recover resources such as nutrients (Hoffmann, ; Ruiz‐Marin, Mendoza‐Espinosa, & Stephenson, ; Tang & Hu, ; Xu, Li, Tang, & Hu, ). A typical formula for rapidly growing algae is C 106 H 181 O 45 N 16 P with a high nitrogen content of 9.2% (Green, Bernstone, Lundquist, & Oswald, ).…”

Section: Introductionmentioning

confidence: 99%

“…Hence, assimilatory algal uptake of inorganic nitrogen (e.g.,

{NH}_{4}^{+} - N

and

{NO}_{3}^{-} - N

) efficiently recovers and recovers nitrogen from wastewater (Arango, Tank, Johnson, & Hamilton, ; Green et al, ). For instance, algae polish secondary wastewater effluent by recovering inorganic nitrogen (a nutrient; Shen, Wall, & Hu, ; Xu et al, ). Algae grown in wastewater are also a leading candidate to produce biofuel (biodiesel), animal feedstock, and other value‐added products (Chen, Zhao, & Qi, ; Dahiya, ; LundquistOctober , Woertz, Quinn, & Benemann, ; Mehrabadi, Craggs, & Farid, ; Quinn & Davis, ).…”

Section: Introductionmentioning

confidence: 99%

Forward osmosis with an algal draw solution to concentrate municipal wastewater and recover resources

Rood

Zhang

Inniss

et al. 2019

Water Environment Research

Self Cite

View full text Add to dashboard Cite

This study aimed to concentrate and recover resources from municipal wastewater with a novel forward osmosis (FO) system. The FO system used synthetic seawater as the draw solution (DS) to extract water from the feed solution (FS) (synthetic raw municipal wastewater). Because ammonium passed through the FO membrane from the FS to the DS, we cultivated an algal strain (Chlorella vulgaris) in the DS to remove and recover ammonium. For three consecutive FO cycles, the algal FO system removed 35.4% of the ammonium from the DS, increased the concentrations of COD and PO 3− 4 − P in the FS by 43.0%, and achieved a water flux of 11.59 ± 0.49 L m −2 hr −1 . Throughout the FO cycles, the algal biomass concentration of the DS stayed at 606 ± 29 mg COD/L due to simultaneous algal growth and DS dilution. This FO process may be feasible to implement for full-scale applications to concentrate wastewater and recover resources. © 2019 Water Environment Federation • Practitioner points• A novel forward osmosis (FO) system with an algal draw solution (DS) concentrated municipal wastewater and recovered resources (ammonium). • Ammonium but not organic matter or phosphate diffused across the FO membrane from the feed solution (FS) to the DS. • The algal FO system increased COD/phosphate concentration in the FS by 43.0% and removed 35.4% of ammonium from the DS. • The water fluxes in the algal FO system and the control were 11.59 and 12.02 L m −2 hr −1 , respectively. • The novel algal FO process has the potential to improve full-scale efficiency by concentrating municipal wastewater and recovering nutrients.

show abstract

Roles of SRT and HRT of an algal membrane bioreactor system with a tanks-in-series configuration for secondary wastewater effluent polishing

Cited by 101 publications

References 39 publications

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

Optimising an outdoor membrane photobioreactor for tertiary sewage treatment

Biological Phosphorus Recovery: Review of Current Progress and Future Needs

Forward osmosis with an algal draw solution to concentrate municipal wastewater and recover resources

Contact Info

Product

Resources

About