Towards sustainable microalgal biomass production by phycoremediation of a synthetic wastewater: A kinetic study

Abstract

26Microalgae are considered as one of the most promising sources of biomass for energy 27 production. However, bioenergy production by microalgal culture is still not

Nitrogen Removal from Landfill Leachate by Microalgae

“…This trend has already been reported by several authors [37,40,41] and it was also demonstrated in this study, as can be seen in Figure 2 (no adaptation phase was observed). Total N–NH 4 + removal was achieved in assay I, pairing with considerable N–NO 3 − removal efficiencies of about 21%–27%.…”

“…In the specific case of assays I and II, average biomass productivities are situated amongst the array of values reported by Silva, et al [37] when using a synthetic wastewater as growth medium. On the other hand, specific growth rates (0.028–0.13 day −1 ) were globally low when compared to typical values reported in the literature of 0.11 and 1.37 day −1 [38,39].…”

“…The differences observed for the different N:P ratios indicate that nitrogen removal was enhanced by the addition of phosphorus to the cultures. Silva, et al [37] have reported N–NH 4 + kinetic constants ranging between 0.19 and 3.86 day −1 , which are higher than those determined in the assays II and III. These results are associated with the lower specific growth rates in these assays caused by the self-shading phenomenon.…”

Biomass production and nutrient assimilation by a novel microalga, Monoraphidium spp. SDEC-17, cultivated in a high-ammonia wastewater

“…These results also suggested the luxury uptake of phosphorus happened for SDEC-17 in wastewater, as they contained a percentage of phosphorus >1% which indicated normal metabolism [38]. The results agreed with the finding by Silva et al [37] that the removal mechanism of luxury absorption may be more important in media with lower N/P molar ratio like CW, in which higher phosphorus mass concentrations were achieved.…”

“…The ratios between phosphorus and nitrogen removal rate were about or less 1 of in three media, which was in consistent with the data reported by Elrifi and Turpin [34] and Mennaa et al [35], although P requirement for algae is lower than N requirement. These phenomena also indicated a luxury uptake of phosphorus, that has occurred in many algae species, like Chlorella vulgaris and Pseudokirchneriella subcapitata [37], Scenedesmus sp. [31], S. subsalsa [9], mixed microalgae culture [36,38], and so on.…”