Improved ammonium removal from industrial wastewater through systematic adaptation of wild type Chlorella pyrenoidosa

Ahmed, Asma; Jyothi, Nimmakayala; Ramesh, Adithya

doi:10.2166/wst.2016.507

Cited by 8 publications

(1 citation statement)

References 26 publications

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“…There are different advantages to having a Scenedesmus dominance in an HRAP supplemented with wastewaters, as this species possesses a high affinity to nitrogen, is strongly resilient to predators 54 , and its biomass can be easily harvested 55 and used for different purposes (e.g. lipid production 56 ). For these reasons, we proposed to study theoretically some proxies of the facilitation efficiency such as resilience and succession times to provide information on the time required for the development of S. pectinatus in the HRAP under the previously stated operating conditions.…”

Section: Resultsmentioning

confidence: 99%

Demonstration of facilitation between microalgae to face environmental stress

Krichen

Rapaport

Floc’h

et al. 2019

Sci Rep

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Positive interactions such as facilitation play an important role during the biological colonization and species succession in harsh or changing environments. However, the direct evidence of such ecological interaction in microbial communities remains rare. Using common freshwater microalgae isolated from a High Rate Algal Pond HRAP treating wastewaters, we investigated with both experimental and modeling approaches the direct facilitation between two algal strains during the colonization phase. Our results demonstrate that the first colonization by microalgae under a severe chemical condition arose from the rapid growth of pioneer species such as Chlorella sorokiniana, which facilitated the subsequent colonization of low growth specialists such as Scenedesmus pectinatus. The pioneer species rapidly depleted the total available ammonia nitrogen favoring the specialist species initially inhibited by free ammonia toxicity. This latter species ultimately dominated the algal community through competitive exclusion under low nutrient conditions. We show that microbial successions are not only regulated by climatic conditions but also by interactions between species based on the ability to modify their growth conditions. We suggest that facilitation within the aquatic microbial communities is a widespread ecological interaction under a vast range of environmental stress.

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Section: Resultsmentioning

confidence: 99%