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Photolysis of methylene blue was studied by using an advanced UV/H2O2 oxidation process. This study investigated different initial dye concentrations (I0, 20, 30 ppm) using different concentrations of H2O2 (10 %, 30%, 50 %) in three additions (5 mL, 10 mL, 15 mL). The results showed that the degradation efficiencies of this dye at different concentrations were as follows: 99.86 % at 10 ppm using 15 mL of 10 % H2O2 after 60 min, 99.22 % at 20 ppm using 15 mL of 30 % H2O2 for 60 min, and 98.90 % at 30ppm using 15 mL of 50 % H2O2 after 90 min. An increase in the optimum concentration of H2O2 was observed with an increase in the initial dye concentration. The de-coloration time also increased with increasing initial dye concentration.

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The continuous tubular reactor is used for the removal of heavy metals ions [Lead (Pb2+) & Copper (Cu2+)] from polluted water was investigated by using ultraviolet light and hydrogen peroxide. The experimental work gave good results, where the removal efficiency of Pb2+ at concentration of 10 ppm was (81.75%) using (15 mL of 30 % H2O2), and 63% using 15 mL of 50% H2O2, while the removal efficiency of Cu2+ at 10 ppm was (83.1%) at (15 mL of 30 % H2O2) and the removal efficiency of Cu2+ was (60.4%) after adding (15 mL of 50% H2O2) during 90 min. The dose of H2O2 increased with the increases in initial concentration of the heavy metal ions.