TY JOUR TI Improvement of purification processes of polluted hydrogen sulfide-containing industrial effluents KW hydrogen peroxide KW industrial water KW industrial wastewater KW Fenton reaction KW hydrogen sulfide-containing wastewater JO Oil and gas technologies and environmental safety AU Titova, L.. AU Vakulenko, V.. PY 2026 IS 2026 PB Astrakhan State Technical University