The Study Of Combined Process Of Fe/C Microelectrolysis-Fenton-biochemical In Antibiotic Wastewater Treatment

In the recent years, with the rapid development of pharmaceutical industry, harmform industrial wastewater attracts people’s attention, features of pharmaceuticalwastewater from chemical synthesis are mainly include complex components and highbiotoxicity of contaminants, big fluctuation of quality and quantity of wastewater etc.Research on treatment of pharmaceutical wastewater from chemical synthesis has becomea difficult point and a hot point in water treatment field.In this paper, according to features of pharmaceutical wastewater from chemicalsynthesis, research status of pharmaceutical wastewater from antibiotics synthesis at homeand abroad were analyzed and compared, synthesis process of cephalosporin antibioticsand actual water quality features of wastewater were combined, a combined treatmentprocess with the combination of Fe/C microelectrolysis,Fenton oxidation and anaerobicdigestion was pointed out, each processing unit was systematically researched and theoptimum technology parameters were found, finally, a set of pilot process was obtainedand its comprehensive treatment effect was investigated.Experimental results showed that when wastewater in high concentration was treatedwith the method of Fe/C microelectrolysis, the optimum operation condition was asfollows: pH was3,dosage of waste scrap iron was20g/L, volume ratio of iron and carbonwas2:1, reaction time was2h，under the condition above, COD in wastewater wasreduced from16500mg/L to7468mg/L, the average COD removal rate was53.16%,BOD5/COD value of processed wastewater was increased from0.09to0.24. After that,effluent from microelectrolysis treatment was treated with Fenton oxidation method, theoptimum operation condition was: dosage of3%H2O2was25ml/L, pH was3, reactiontime was80min. the average COD content of the effluent was reduced to4846mg/L, theaverage removal rate was32.35%, BOD5/COD value of the processed water was increasedto0.48, the water met the requirements of subsequent biochemical treatment. Biochemicaltreatment including anaerobic digestion and bio-contact oxidation was performed forpretreated wastewater, when the system was stable; COD was reduced to less than300mg/L.In pilot scale system of the combination process，if sanitary sewage is mixed beforeentering the anaerobic system, COD of the water can be reduced to below110mg/L, thismeet the discharging standard, the operating cost is6yuan/t, this can provide reference and guidance for practical engineering applications.