Algae-facilitated chemical phosphorus removal during high-density Chlorella emersonii cultivation in a membrane bioreactor

Xu, Meng; Bernards, Matthew T.; Hu, Zhiqiang

doi:10.1016/j.biortech.2013.12.026

Cited by 123 publications

(45 citation statements)

References 17 publications

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“…The biomass productivity was higher compared with other studies operated at an HRT of 1 d; Honda et al. reported biomass productivity of 48 mg/L·d in a submerged membrane PBR using ASE [22], and Xu et al reported production of 32.5 mg/L·d using an algae-based membrane bioreactor (A-MBR) [13].…”

Section: Algal Growth and Nutrient Removal Under Continuous Conditionsmentioning

confidence: 94%

“…Thus, existing technologies, such as sedimentation, filtration and centrifugation, are difficult to apply for microalgae harvesting in real scale. Membrane filtration has become a promising technology for microalgae harvesting due to various reasons such as low chance of chemical contamination and less biomass washout [7][8][9][10][11][12][13]. To date, very limited studies have been conducted to investigate the applicability of M-PBR under continuous cultivation conditions of microalgae using sewage effluent as nutrient source.…”

Section: Introductionmentioning

confidence: 99%

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Microalgae membrane photobioreactor for further removal of nitrogen and phosphorus from secondary sewage effluent

Boonchai

Seo

2015

Korean J. Chem. Eng.

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For further removal of nitrogen and phosphorus from secondary sewage effluent, two strains of microalgae, Chlorella sp. ADE4 and Chlorella vulgaris, were selected for cultivation in the membrane photobioreactor. The Chlorella sp. ADE4, isolated from wastewater illustrated higher removal efficiency of T-N and T-P, and faster algal growth than the Chlorella vulgaris in a batch experiment using treated sewage effluent. The T-N and T-P removal efficiency was 66.5% and 94.5%, respectively, within HRT of two days when the photobioreactor of Chlorella sp. ADE4 was operated in continuous mode. The effluent water quality was 6.3 mg/L and 0.044 mg/L for T-N and T-P. It was estimated that the algal biomass productivity was 55 mg/L·d with T-N and T-P uptake rates of 6.25 and 0.483 mg/L·d, respectively, in the system. Operational flux below 58 LMH was found to be effective for separation of algal cell from effluent in membrane system.

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Section: Algal Growth and Nutrient Removal Under Continuous Conditionsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Microalgae membrane photobioreactor for further removal of nitrogen and phosphorus from secondary sewage effluent

Boonchai

Seo

2015

Korean J. Chem. Eng.

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“…5), the average removal efficiency for the A-MBRs was 34%. As NO À 3 -N removal by algae relies on N uptake via cell assimilation and thereafter biomass wasting (Xu et al, 2014), it is not surprising that the N removal in such A-MBRs was low due to long SRT (25 d) operation. For comparison, the high-density algae cultivation resulted in good P removal, with an average removal efficiency of 78% at the influent phosphorus concentrations ranging from 4 to 9 mg/L (Fig.…”

Section: Nutrient Removal By Algae In A-mbrsmentioning

confidence: 97%

“…Each A-MBR was operated as a continuous stirred tank reactor (CSTR) and it was fed with the same synthetic wastewater containing the following chemical components (in mM): NaNO 3 (0.16-0.07), NaCl (0.43), NaHCO 3 (1), MgSO 4 (0.3), CaCl 2 Á2H 2 O (0.17), K 2 HPO 4 (0.04-0.09), EDTA disodium salt dehydrate (0.01), and trace metals including Fe, Mn, Mo, Cu, Zn and Ni (Xu et al, 2014). K 2 HPO 4 and NaNO 3 were used as phosphorus and nitrogen sources, respectively, with the concentrations of P and N varying in the feed to study the nutrient removal efficiency at different nutrient concentrations.…”

Section: Algal Seeding Mbr Operation and Monitoringmentioning

confidence: 99%

Application of nano TiO2 modified hollow fiber membranes in algal membrane bioreactors for high-density algae cultivation and wastewater polishing

Yin

Deng

et al. 2015

Bioresource Technology

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Polyvinylidene fluoride (PVDF) hollow fiber membranes with nano-TiO2 (5% of PVDF by mass, average size = 25 nm) additives were fabricated and applied for high-density algae (Chlorella vulgaris) cultivation. At the average light intensity of 121 μmol/m(2)/s, the algal membrane bioreactors (A-MBR) operated at a hydraulic retention time of 0.5d and an average solids retention time of 25d had an average algae biomass concentration of 2350 ± 74 mg/L (in COD units) and algal biomass production rate of 6.5 ± 0.1g/m(2)/d. The A-MBRs removed an average of 78% of phosphorus from the wastewater at the initial total phosphorus concentrations ranging from 3.5 to 8.6 mg/L. The nano TiO2-embedded membranes had improved surface hydrophilicity with its total resistance about 50% lower than that of the control. This study demonstrated that PVDF/TiO2 nanocomposite membranes had a better antifouling property for high-density algae cultivation and wastewater polishing.

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“…and was assessed in laboratory scale pilots. Average Total P-removal rates between 66 and 97% were reported under varying reactor configurations (RuizMartinez et al, 2012;Xu et al, 2014;Praveen and Loh, 2016). The potential of the technology at lab scale appears promising, although algal MBR has not been successfully operated at pilotscales under temperate or cooler conditions.…”

Section: Application Of Algal P Systemsmentioning

confidence: 99%

A Review of Phosphorus Removal Technologies and Their Applicability to Small-Scale Domestic Wastewater Treatment Systems

Bunce

Ndam

Ofiţeru

et al. 2018

Front. Environ. Sci.

406

204

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The removal of phosphorus (P) from domestic wastewater is primarily to reduce the potential for eutrophication in receiving waters, and is mandated and common in many countries. However, most P-removal technologies have been developed for use at larger wastewater treatment plants that have economies-of-scale, rigorous monitoring, and in-house operating expertise. Smaller treatment plants often do not have these luxuries, which is problematic because there is concern that P releases from small treatment systems may have greater environmental impact than previously believed. Here P-removal technologies are reviewed with the goal of determining which treatment options are amenable to small-scale applications. Significant progress has been made in developing some technologies for small-scale application, namely sorptive media. However, as this review shows, there is a shortage of treatment technologies for P-removal at smaller scales, particularly sustainable and reliable options that demand minimal operating and maintenance expertise or are suited to northern latitudes. In view of emerging regulatory pressure, investment should be made in developing new or adapting existing P-removal technologies, specifically for implementation at small-scale treatment works.

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Algae-facilitated chemical phosphorus removal during high-density Chlorella emersonii cultivation in a membrane bioreactor

Cited by 123 publications

References 17 publications

Microalgae membrane photobioreactor for further removal of nitrogen and phosphorus from secondary sewage effluent

Microalgae membrane photobioreactor for further removal of nitrogen and phosphorus from secondary sewage effluent

Application of nano TiO2 modified hollow fiber membranes in algal membrane bioreactors for high-density algae cultivation and wastewater polishing

A Review of Phosphorus Removal Technologies and Their Applicability to Small-Scale Domestic Wastewater Treatment Systems

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