Experimental Study On Pharmaceutical Wastewater Treatment By Combined Two-phase Anaerobic And Aerobic Process

In this paper,the combined process of two-phase anaerobic and aerobic was used.Two types of typical high concentration pharmaceutical wastewater were chosen as research objects.To the characteristic of high sulfate in antibiotics wastewater, the pilot-scale acid phase UASB-gas stripping desulfurization-methane phase UASB-SBR process was used to deal with it.The starting and the treatment effect of the process were studied and the operational parameters of each section were optimized. Hydrolytic acidification-UASB-SBR process was used to treat aluminon and cholesterol mixed pharmaceutical wastewater.The debugging operation of the process in the engineering application was studied and the operational parameters of each section were determined.Otherwise,the removal of materials in wastewater and the cultivation of sludge in UASB were analysed and discussed.The results of the study showed that:â… .Using the pilot-scale acid phase UASB-gas stripping desulfurization-methane phase UASB-SBR process to treat antibiotics wastewater with high concentration sulfate,when the influent COD_Crwas 10680～14140mg/L and sulfate was 1280～1610mg/L,the effluent COD_Crof 760～1020mg/L,COD_Craverage removal rate of 92.8%and sulfate average removal rate of 87.7%were reached.When the pH values of influent and effluent was 5.5 and 6.5,the average sulfate load of influent was 1.4 kg/(m³Â·d),the hydraulic load is 0.5m/h,the average removal rate of sulfate in acid phase UASB was up to 86.1%.When HRT was 3.8 hours,pH of influent was 6.5,gas stripping desulfurization got the average removal rate of sulfide up to 86.3%.After being desulfurized,sulfide in the methane phase UASB could be maintained below 90 mg/L.when influent COD_Crload reached 5.2 kg/(m³Â·d),removal rate of COD_Crwas 50.6～56.5%.Controlling the influent COD_Crload around 1.3 kg/(m³Â·d),MLSS 4.0±0.5 g/L,DO from 1.5 to 4.0 mg/L,COD_Crremoval rate of 81.6%and ammonia removal rate of 98.6%were reached in SBR.â…¡.Using hydrolytic acidification-UASB-SBR process to treat aluminon and cholesterol mixed pharmaceutical wastewater,the results showed that:Appending spherical biologic filler in hydrolytic acidification pond and using aeration agitation, after successful starting,the VFA in effluent average increased 10mmol/L than in influent,B/C increased about 0.1,COD_Craverage removal rate was up to 7%.When UASB was stably operated,the influent volume load of COD_Crreached 4.8 kg/(m³Â·d). The COD_Crof influent varied from 6800 to 7600 mg/L and was 750～900 mg/L in effluent.The removal rate of COD_Crwas 85%.When the influent sulfate was below 500 mg/L,the COD_Crremoval rate of UASB was up to 85%.When the influent sulfate of UASB was around 1000～2600mg/L,methanogenic bacteria would be significantly inhibited and the removal rate of COD_Crdroped to 80%.MLSS 3000～5000mg/L, volume ratio of air to water 45:1,the quality of SBR effluent with COD_Cr180～270mg/L and ammonia nitrogen less than 20mg/L attained the secondary criteria specified in the Integrated Wastewater Discharge Standard(GB 8978-1996).