Patent ID: 7935256

Claim:
A method for the treatment of waste water from florfenicol production comprising: (a) adding 0.5˜10 g scrap iron or steel slag to 1 L of copper-ion-containing wastewater at pH 6˜9; after sufficient reaction and filtering arriving at a filtered wastewater and adding at least one of limestone, lime and Ca(OH)2 to the filtered wastewater at pH 7˜11 and separating solid and liquid; (b) mixing the liquid of step (a) with a wastewater of dissociation section, then using ozone to oxidize the reductive compounds and strip ammonia from the mixture; (c) mixing the wastewater of dissociation section of said step (b) after ozone oxidization with at least one of a wastewater of esterification section and a wastewater of florfenicol-formation section, and diluting it to 1500˜10000 mg/L of COD concentration; adding 15˜100 mg/L phosphate and 1-80 μg/L of trace elements and adjusting pH to 6.5˜7.8 and then flowing into an anaerobic reactor with hydraulic retention time 10˜18 h; and (d) diluting effluent from said anaerobic reactor to 200˜1000 mg/L of COD concentrations and adjusting pH to 6˜8, and then flowing into aerobic reactor with retention time of 20˜28 h.