1：Experimental Design and Method Selection:

A continuous ?ow aluminum reactor with UVC lamps was used to study the oxidation of H2S in water. The design included quartz sleeves for lamp placement and ba?es for homogeneous mixing. The method combined UVC light (254 nm) with dissolved oxygen for oxidation.

2：Sample Selection and Data Sources:

Laboratory tests used H2S-enriched tap water (0-20 mg/L H2S) and natural well water from Tzofar220 well (12-20 mg/L H2S, pH 6.8-7.0, 38°C, low dissolved oxygen). Samples were prepared using sodium sul?de nonahydrate for H2S enrichment.

3：8-0, 38°C, low dissolved oxygen). Samples were prepared using sodium sul?de nonahydrate for H2S enrichment. List of Experimental Equipment and Materials:

3. List of Experimental Equipment and Materials: Aluminum reactor (internal diameter 25.4 cm, height 59.5 cm, net volume 24.2 L), quartz sleeves (49 mm diameter), UVC lamps (Atlantic UV, GPH-436T5L/4, 21 W nominal, 8 W output, 254 nm, photon ?ow 1.02e19 photons/s), metering pumps for H2S and pH adjustment, dissolved oxygen electrode (WTW FDO925), ozone generator (LAB2B, Ozonia Ltd. for lab; TOGC45, Ozonia Ltd. for field), UV-vis spectrophotometer (Shimadzu UV2600), Hach DR890 spectrophotometer with AccuVac kit, Hach 2100 P turbidity meter, static mixer, compressed oxygen source.

4：4 cm, height 5 cm, net volume 2 L), quartz sleeves (49 mm diameter), UVC lamps (Atlantic UV, GPH-436T5L/4, 21 W nominal, 8 W output, 254 nm, photon ?ow 02e19 photons/s), metering pumps for H2S and pH adjustment, dissolved oxygen electrode (WTW FDO925), ozone generator (LAB2B, Ozonia Ltd. for lab; TOGC45, Ozonia Ltd. for field), UV-vis spectrophotometer (Shimadzu UV2600), Hach DR890 spectrophotometer with AccuVac kit, Hach 2100 P turbidity meter, static mixer, compressed oxygen source. Experimental Procedures and Operational Workflow:

4. Experimental Procedures and Operational Workflow: H2S stock solution was introduced into feed water; pH adjusted with HCl/NaOH. Water ?owed through reactor at controlled rates (e.g., 300 L/hr for 4.8 min retention time). UVC lamps were illuminated; oxygen was bubbled in for field tests. Ozone or hypochlorite was added in some experiments. Inlet and outlet concentrations of H2S, oxygen, sulfate, and turbidity were measured. Iodometric titration for H2S, turbidometric method for sulfate.

5：8 min retention time). UVC lamps were illuminated; oxygen was bubbled in for field tests. Ozone or hypochlorite was added in some experiments. Inlet and outlet concentrations of H2S, oxygen, sulfate, and turbidity were measured. Iodometric titration for H2S, turbidometric method for sulfate. Data Analysis Methods:

5. Data Analysis Methods: Quantum e?ciency calculated as oxidized H2S molecules per emitted photons. Conversion and sulfate yield analyzed vs. parameters like retention time, light intensity, pH. Statistical averaging of repeated measurements.