Potential of microalgae in the bioremediation of water with chloride content

Abstract

In this work it was carried out the bioremediation of water containing chlorides with native microalgae (MCA) provided by the Centre for study and research in biotechnology (CIBIOT) at Universidad Pontificia Bolivariana. Microalgae presented an adaptation to the water and so the conditions evaluated reaching a production of CO 2 in mg L -1 of 53.0, 26.6, 56.0, 16.0 and 30.0 and chloride removal efficiencies of 16.37, 26.03, 40.04, 25.96 and 20.25% for microalgae1, microalgae2, microalgae3, microalgae4 and microalgae5 respectively. Water bioremediation process was carried out with content of chlorides in fed batch system with an initial concentration of chlorides of 20585 mg L -1 every 2 days. The Manipulated variables were: the flow of MCA3 (10% inoculum) for test one; NPK flow for test two, and flow of flow of MCA3+0.5 g L -1 NPK. Chloride removal efficiencies were 66.88%, 63.41% and 66.98% for test one, two and three respectively, for a total bioprocess time of 55 days.Keywords: chlorides in water, bioremediation, native algae, paper industry, feed batch. Potencial de microalga na biorremediação da água com conteúdo de cloretos ResumoNeste trabalho avaliou-se a biorremediação da água com conteúdos de cloretos utilizando microalgas nativas (MCA) fornecidas pelo Centro de Estudos e Pesquisas em Biotecnologia (CIBIOT) da Universidad Pontifícia Bolivariana. As microalgas empregadas apresentaram uma adaptação ao meio de cultura e as condições operacionais avaliadas atingindo uma produção de CO2 em mg L -1 de 53,0, 26,6, 56,0, 16,0 e 30,0 e eficiências de remoção de cloretos de 16,37, 26,03, 40,04, 25,96 e 20,25% para MCA1, MCA2, MCA3, MCA4 e MCA5 respectivamente. A biorremediação da água com conteúdos de cloretos foi realizada em modo batelada alimentada (Feed Batch) com uma concentração inicial de cloretos de 20585 mg L -1. A alimentação foi realizada a cada 2 dias. A variável manipulada foi: ensaio um, uma vazão de MCA3 (10% de inoculo); ensaio dois, uma vazão de NPK e ensaio três, uma vazão de MCA3+0,5 g L -1 NPK. As eficiências de remoção foram 66,88%, 63,41% e 66,98% para os ensaios um, dois e três, respectivamente num tempo do bioprocesso total de 55 dias.Palavras-chave: cloretos na água, biorremediação, algas nativas, industria de papel, batelada alimentada.

Removal of total dissolved solids from wastewater using a revolving algal biofilm reactor

“…The adaptation to high chloride level has been reported in green alga Botryococcus braunii (Rao, Dayananda, Sarada, Shamala, & Ravishankar, ). Ramírez, Vélez, Rendón, and Alzate () reported the use of algae in the bioremediation of water where chloride removal efficiencies ranged within 16%–40% with different species at an initial chloride concentration of 20 g/L.…”

Application of photosynthetic microalgae in the direct desalination pretreatment of seawater

“…The growth of microalgae in seawater derives from their ability to transform inorganic matter into organic using the sun’s energy during photosynthesis (Rendón et al ., 2015), and seawater is rich in inorganic salts with the major ionic composition estimated as 10.781 g/kg (Na), 19.353 g/kg (Cl), 1.284 g/kg (Mg), 0.4176 g/kg (Ca), 0.399 g/kg (K) and 2.712 g/kg (S) (Quinby‐Hunt and Turekian, 1983). In addition, some microalgae are halophilic organisms and thus have strategies that enable them to adapt to the osmotic stress of marine environments, maintaining high intracellular concentrations of salt and synthesizing some solutes that help them in balancing their osmotic pressure (Li et al ., 2011).…”

Evaluation of the operational conditions in the production and morphology of Chlorella sp.

“…and Scenedesmus sp. easily adapted to this type of water (Ramirez et al, 2018), (Chellappa et al, 2008). Likewise, Kim et al (2007) reported the growth of Chlorella sp and Scenedesmus sp.…”