Research on treatment of pharmaceutical wastewater with hydrological acidification/aerobic bio-oxidation/Fenton oxidation process

Key words: 
• pharmaceutical wastewater /
• hydrolyzing acidification /
• AB process /
• Fenton oxidation

Abstract: The research on pharmaceutical wastewater treatment using the hydrological acidification / aerobic bio-oxidation / Fenton oxidation process was conducted. Experimental results showed that the above process could be successfully used in pharmaceutical wastewater treatment. After hydrological acidification of 16～20 h, B/C ratio of the wastewater was observed to increase up to 0.30~0.35 at temperature of 45~55℃. AB aerobic biological process was used and COD removal rate of A stage was achieved above 65% after 2~3 h aeration, and COD removal rate above 40% after 7～9 h aeration in B stage. The effluent from biological treatment system was further disposed by Fenton oxidation process with 5~6 h HRT, from which the effluent could conform to the first-rate quality regulated by national discharge standard for wastewater.