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

Abstract

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.

Effect of Different Light Sources on Algal Biomass and Lipid Production in Internal Leds-Illuminated Photobioreactor

“…Recently, researches have focused on using close system photobioreactor (PBR) for the wastewater treatment process which is easier to control, has high biomass production and reduces risk of contamination [7] . PBRs provide an artificial cultural environment to cultivate microalgae with the adjustable growth condition including lighting, nutrient and aeration.…”

Using an Algal Photo-Bioreactor as a Polishing Step for Secondary Treated Wastewater

“…In this study, the settling time in the lamella settler was a minimum of two hours in phase 5, which is thought to be adequate in wastewater applications. Better harvesting for the fugitive algal biomass can be obtained by using membrane technology for separation of algal biomass [18]. However, the cost saving and membrane fouling could be detrimental for this technology.…”

“…To our knowledge, limited studies have been undertaken on the feasibility of an algal photo-bioreactor as a polishing treatment step for secondary treated wastewater [18]. Therefore, the objective of this study was primarily to investigate the performance of a pilot-scale algal photo-bioreactor in treating real secondary treated wastewater produced from an existing WWTP under continuous flow conditions.…”

Kinetics of anaerobic methane oxidation coupled to denitrification in the membrane biofilm reactor

“…In our study, we develop a model that only considers one type of active biomass in anaerobic conditions. This makes it applicable to treat groundwater, drinking water, and wastewater effluent for nitrogen removal (Boonchai & Seo, ; Lee & Rittmann, ; Ziv‐El & Rittmann, ), since the dissolved oxygen in those waters could either be in very low concentrations or be degassed. It also provides a direct comparison of the CH 4 ‐based and H 2 ‐based MBfRs for denitrification.…”