Advanced reduction processes (ARPs) form highly reactive reducing radicals and aqueous electrons, which can reduce oxidized contaminants, by activating reducing agents. Experiments were conducted to investigate the kinetics of nitrate degradation by the sulfite/ultraviolet (UV) ARP, which has been proven to be the most effective ARP. Experimental variables were pH, UV (253.7 nm) intensity, and sulfite concentration. Rate of nitrate reduction increases with increasing pH, UV intensity, and initial sulfite concentration. The efficiency of photochemical degradation of nitrate (quantum yield based on overall reaction rate) was unaffected by UV intensity, but decreased with pH and initial sulfite concentration. Nitrite was identified as a major intermediate product of nitrate mineralization by the UV/sulfite ARP, which was simultaneously degraded along with nitrate.
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