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Abstract In this paper, hydrogen production by catalytic treatment of analgin pharmaceutical wastewater was systematically investigated in supercritical water (SCW) with a continuous reactor for the first time. The effect of sodium salts on the decomposition of analgin pharmaceutical wastewater in supercritical water was investigated in a continuous reactor. The results showed that NaHCO3, Na2CO3, NaCl and mixed sodium salts reduced the CO and CH4 fraction in the gaseous product and increase the fraction of CO2, which depresses the heating value of the gaseous product. All these sodium ingredients exhibit an inhibitive effect on the formation of H2, CO, CH4 and CO2 and the gasification efficiency; the inhibition strength of various sodium ingredients follows the order of mixed sodium salts NaHCO3 Na2CO3 NaCl. The inhibitive effect on the formation of gaseous products is enhanced under high reaction temperature and long residence time, but is almost independent on the reaction pressure. Under high temperature, high pressure and long residence time, gas generation may be inhibited considerably by the mixed sodium salts, possibly due to a synergetic effect of different sodium salts.
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