Photooxidative Treatment of Sulfurous Water for Its Potabilization^¶

Abstract

The feasibility of potabilization of sulfurous water was investigated by photochemical oxidation processes using a batch photoreactor and a continuous‐flow photoreactor, equipped with UV lamps of 1000 W and 1500 W, respectively. Additionally, two advanced processes of oxidation were applied i.e. with a use of a UV light/H2O2/air and UV light/H2O2/O3/air. These two processes were compared for their efficiency to the direct oxidation process where ozone is used in the absence of UV light. Results obtained for both advanced processes showed better oxidation than takes place by ozone in the absence of UV light. After the photooxidation processes, different processes for the absorption or precipitation of sulfates were investigated to comply with the World Health Organization (WHO) norm that demands a limit of ≤250 mgL−1 of SO42− in drinking water. Additionally, reverse osmosis was simulated using Osmonics Inc. software to predict the feasibility of lowering the salt concentration below WHO limits.

Comparison of UV Concentration Geometries as an Element Capable for the Increment of the Photocatalytic Efficiency of Advanced Oxidation Processes, Inside the Annular Batch Systems

“…Taking a value of 591 nm as a wavelength reference [4] the colorant register an initial absorption of 0.54 A.U. At the end of the experimental time, that absorption was of 0.03 A.U.…”

“…Usually developed under ultraviolet (UV) radiation, the AOP's have reported the chemical products removal like anilines [2] textile dyes [3] sulphurous species [4] bio-recalcitrant pesticides [5] herbicides, fungicides [6], phenols [7] pharmaceutical formulations [8] among other compounds [9] in a successfully form. Therefore, the AOP's can be considered as a destructive sink of these undesirable compounds in the environment, and can be scaled or automated for both the increment of the water volume treatment and of the efficiency of the operation.…”

Photochemical treatment as an alternative to improve the quality of wastewater after advanced primary treatment.

“…The AOP's have been employed for the conditioning of the water coming from groundwater and sulphide deposits [4][5] , textile, pharmaceutical 6 , food, paper, chemical, and other industrial processes. However, their use has not been widely applied yet, because the specific conditions and calculation of doses of reagents needed for complete mineralization of organic compounds functioning must be determined through experimentation for effective wastewater treatment.…”