Improved barium removal and supersaturation depletion in wastewater by precipitation with excess sulfate

dc.creatorRONQUIM, FLAVIA M.
dc.creatorCOTRIM, MARYCEL E.B.
dc.creatorGUILHEN, SABINE N.
dc.creatorBERNARDO, ANDRE
dc.creatorSECKLER, MARCELO M.
dc.date2018
dc.date2018-07-31T10:56:13Z
dc.date2018-07-31T10:56:13Z
dc.date.accessioned2023-09-28T14:07:47Z
dc.date.available2023-09-28T14:07:47Z
dc.identifier2214-7144
dc.identifierhttp://repositorio.ipen.br/handle/123456789/28995
dc.identifier23
dc.identifier10.1016/j.jwpe.2018.04.007
dc.identifier69.509
dc.identifier80.25
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/8999239
dc.descriptionBarium ions found in wastewaters cause incrustation on membrane separation equipment used in desalination systems. In this study barium removal by precipitation is addressed, considering excess sulfate addition as a means of reducing barium concentration in solution and depleting BaSO4 supersaturation. Precipitation is conducted with synthetic wastewater in semicontinuous mode. For low excess sulfate, an induction time of a few hours is observed. As the excess sulfate is increased and/or as barium sulfate seeds are added, precipitation proceeds within a few minutes. Besides, the excess sulfate improves barium ion removal due to the common-ion effect. Residual supersaturation ratios were found to lie within the range of 1.1???3. These values were associated with a fourth order dependency of the molecular growth rate with the supersaturation ratio. Calcium carbonate and calcium sulfate dihydrate were found to be ineffective heterogeneous seeds to barium sulfate precipitation. Calcium ions were found to inhibit BaSO4 precipitation, blocking the process at a high residual supersaturation ratio of 4???5. For a sufficiently large initial supersaturation, the solution approaches equilibrium after 180???min.
dc.format265-276
dc.relationJournal of Water Process Engineering
dc.rightsopenAccess
dc.subjectwaste water
dc.subjectground water
dc.subjectbarium sulfates
dc.subjectprecipitation
dc.subjectcrystal growth
dc.titleImproved barium removal and supersaturation depletion in wastewater by precipitation with excess sulfate
dc.typeArtigo de peri??dico
dc.coverageI


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