Submerged membrane – (GAC) adsorption hybrid system in reverse osmosis concentrate treatment

Abstract

Nitrate contamination of ground and surface waters causes environmental pollution and human health problems in many parts of the world. This study tests the nitrate removal efficiencies of two ion exchange resins (Dowex 21k XLT and iron modified Dowex 21k XLT (Dowex-Fe)), and two chemically modified bio-adsorbents (amine grafted corn cob (AG corn cob) and amine grafted coconut copra (AG coconut copra)) using a dynamic adsorption treatment system. A submerged membrane (microfiltration) adsorption hybrid system > SMAHS treatment of polluted water continuously maintained NO3 -below WHO limit.> NO3 -adsorption capacity: Dowex-Fe > Dowex > coconut copra/amine > corn cob/amine > Treated water volume was in the same order as the adsorption capacity.> Transmembrane pressure increased with flux and was highest for bio-adsorbents.

Membrane distillation for wastewater reverse osmosis concentrate treatment with water reuse potential

“…The real/untreated WWROC was pre-treated by a batch adsorption using 5 g/L of GAC based on the results from a previous study [6]. Coal-based GAC (MDW4050CB, James Cumming & Sons Pty Ltd) was used and its particle size was in the range of 425 and 600 µm.…”

“…For instance, two medium scale WRPs treating wastewater biologically in New South Wales in Australia (Homebush bay and St. Marys WRPs) are using RO technology as a final treatment process. On a daily basis, around 2000 kL of water is treated by RO in the Homebush bay WRPs, resulting in substantially large volumes of WWROC (300 kL/day) that contain inorganic ions and dissolved organic carbons (DOCs) as well as pharmaceuticals and personal care products (PPCPs) micropollutants [6,7]. A direct disposal of WWROC containing micropollutants into water bodies would pose eco-toxicological risk and threaten aquatic eco-system in the long-term, necessitating an appropriate treatment of WWROC prior to disposal.…”

Mathematical Modelling of Nitrate Removal from Water Using a Submerged Membrane Adsorption Hybrid System with Four Adsorbents

“…Most previous SMAHS studies have mainly focused on the removal of metals [7,8], phosphate [9], colour and reactive dyes [10], and organic micropollutants [11]. Relatively recently, nitrate removal using the SMAHS was reported [12].…”

Transport phenomena and fouling in vacuum enhanced direct contact membrane distillation: Experimental and modelling

“…To study the performance of DCMD and V-DCMD for the treatment of ROC wastewater, a synthetic solution (1.5 L) was used. The synthetic solution comprised of 600 mg Na/L, 800 mg Cl/L, 90 mg Ca/L and 200 mg SO4/L, emulating the characteristics of the major ions present in wastewater ROC from WRPs [8].…”

“…For instance, two WRPs for biologically treated wastewater in New South Wales (Homebush bay and St. Marys WRPs) are using RO technology as a final treatment process. On a daily basis, around 2000 kL of water is treated by RO in Homebush bay WRP, resulting in 300 kL/ day ROC while substantially larger volume of ROC (7000 kL/day) is produced from St.Marys WRP [8].…”