REMOVAL OF IRON IN THE PRESENCE OF HUMIC ACID, SULPHATE AND NITRATE FROM DRINKING WATER BY ATMOSPHERIC OXYGEN

Iron which is among the most common heavy metals in water supply can be a nuisance despite it is non-hazardous elements. Because ferrous iron in the water sources reacts with air causing turbidity and turns reddish-brown color and it cannot be used as drinking water according to TSE (Turkish Standards Institute) legislations. Ferrous iron concentrations in the ground waters and some surface waters which are used as drinking water sources in Turkey exceed the limit values recommended by EPA (Environmental Protection Agency) legislations. Also iron in waters causes stains in the fabrics and accumulates on pipe walls which cause head loss

Effect of photocatalytic pretreatment on the membrane performance in nanofiltration of textile wastewater

Traditional methods like biological treatment, flocculation-coagulation, adsorption, and advanced oxidation are commonly employed for textile wastewater treatment, but their sustainability is hindered by issues such as the adverse impact of textile wastewater on microorganisms and the requirement for substantial chemical usage. In response to increasingly stringent legal discharge standards, membrane technologies are emerging as prominent alternatives for effective textile wastewater treatment. The application of photocatalysis as a pretreatment to improve effluent quality and treatment performance has shown effective results in the treatment of textile wastewater by nanofiltration (NF). However, innovative solutions are needed to improve the efficiency of UV photocatalytic reactors. Here, the TiO2/halloysite nanotube (HNT) photocatalyst was shown to completely remove dyes under UV illumination. Two wastewater samples from photocatalytic (PC) pretreatment were treated using innovative NF membranes with different contents. The study examined the impact of PC pretreatment on the flux of wastewater from a textile factory heat recovery tank, which increased from 18.32 to 27.63 L/m2.h. The membranes achieved > 98% removal in COD, while bare membrane achieved 95% removal in conductivity. The addition of s-DADPS as monomer and HNT as nanoparticles to the membranes with different compositions affected the cross-linking in the TFC layer. During the tests conducted on the water extracted from the dyeing tank, the color was completely eliminated without any loss of flux. Additionally, improvements in COD removal were observed