Proposing an Economical and Effective Treatment Process for Reverse Osmosis Concentrate in Brackish Water Desalination Using Chlorella sp.

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dc.contributor.authorKayathri, V.
dc.contributor.authorKottehewa, D.J.
dc.date.accessioned2021-02-05T07:12:59Z
dc.date.available2021-02-05T07:12:59Z
dc.date.issued2020
dc.description.abstractCurrently, brackish water desalination is practiced through reverse osmosis technology as it utilizes lower energy for high and stable quality water products. Though it produces high-quality water, around 15-35% of raw water is discharged as a waste concentrate which is problematic in terms of environmental and economic aspects. This study is to propose a cost-effective as well as efficient method to treat Brackish Water Reverse Osmosis (BWRO) concentrate through exploiting Chlorella sp. Isolated Chlorella sp. was grown in photobioreactor where sunlight was used as a light source and concentrate was used as an inorganic carbon source. Chlorella sp. were inoculated at 15% (v: v) in 250 mL Erlenmeyer flasks and kept in rotation at 250 rpm without aeration. Algae were grown in three different concentrates separately in the batch model. The retention time of the batch model was 9 days in which on the last day maximal of 1.16 g L -1 of biomass was produced. Total dissolved solids, electrical conductivity, alkalinity, total hardness, nitrate, and phosphate were able to remove with efficiencies up to 63.07, 63.42, 80.39, 74.36, 88.28, and 88.79% respectively. 1 m3 of concentrate was effectively treated in a surface area of 0.12 m2 of the photobioreactor. Due to the lack of discharge standards for reverse osmosis concentrate, the treated water quality of concentrate was compared with its feed water to check whether discharging in to surface water bodies and recycling is possible. The comparison studies showed that concentrate with high salinity, hardness, and alkalinity approximately met its feed water quality after batch model treatment which is harmless on discharge. Keywords: Chlorella sp., Brackish water reverse osmosis concentrate, Inorganic ion removal, Nutrient removalen_US
dc.identifier.isbn9789550481293
dc.identifier.urihttp://www.erepo.lib.uwu.ac.lk/bitstream/handle/123456789/5806/proceeding_oct_08-263.pdf?sequence=1&isAllowed=y
dc.language.isoenen_US
dc.publisherUva Wellassa University of Sri Lankaen_US
dc.relation.ispartofseries;International Research Conference
dc.subjectEnvironmental Scienceen_US
dc.subjectEcologyen_US
dc.subjectWastewater Managementen_US
dc.subjectWater Management Systemen_US
dc.titleProposing an Economical and Effective Treatment Process for Reverse Osmosis Concentrate in Brackish Water Desalination Using Chlorella sp.en_US
dc.title.alternativeInternational Research Conference 2020en_US
dc.typeOtheren_US
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