Study On The Combined Process Of Coagulation Sedimentation+ABR+UASB+A/O+Air Flotation For Treating High Concentration Pharmaceutical Wastewater Of Raw Materials Of Antibiotic

Microbial fermentation is used to produce the pharmaceutical raw materials of micronomicin sulfate and the medicament by a pharmaceutical company in Jiangxi,it will produce high concentration wastewater during the production process.This article has put forward the combination of coagulation sedimentation+ABR+UASB+A/O+Air flotation to treating this production wastewater for the reason that the wastewater has the characteristic of high CODcr,high NH3-N and high SS.First of all,raw water should flow into the pre-precipitation tank with lift pump,much SS and CODcr will be remove through the way of precipitation by putting into coagulant,then,the effluent wastewater from precipitation flows into ABR and UASB to remove most of CODcr in chronological order, the effluent wastewater from anaerobic treatment remove NH3-N with A/O,the oxic tank has a great deal of nitrate,it will flow back to the anoxic tank through internal circulation.and removes the nitrate by denitrification in the anoxic tank,the carbon source for denitrification in anoxic tank comes from the organic compound in sewage.The air flotation as a depth of processing to make sure the final effluent wastewater can reach the qualified standard stability.Several researching results were studied in the project commissioning by treating the wastewater with the combination of coagulation sedimentation+ABR+UASB+A/O+Air flotation.(1) The high concentration pharmaceutical raw materials of antibiotics wastewater has the characteristic of high CODcr and high SS so that it has to pretreatment by coagulation. PAC and PAM are put into the tank as the coagulant,the removeal rate of CODcr is nearly40%, the removeal rate of SS is nearly95%.(2) ABR starts by the way of low load,the temperature range from33℃to37℃.It cost50d to complete the domestication of sludge, the removeal rate of CODcr is nearly70%, the removeal rate of SS is nearly72%.(3)The domestication of granular sludge should be controled the load from low to high in UASB,it cost almost60d to finish it,the average sludge concentration increase from5-10gVSS/L to30-40gVSS/L,it means the domestication of granular sludge had completed.After stable operation, the average mass concentration of VSS had reached40g/L,pH=7.3-7.5,HRT=23.7,VFA of effluent water range from2-3mmol/L, the removeal rate of CODcr is nearly60%.(4) During A/O system stable operation, the removeal rate of CODcr is nearly85%, the removeal rate of NH3-N is nearly80%,SV ranges from25%-30%,it controls reflux ratio of the nitrified liquid to1:1,and controls reflux ratio of sludge to1:1,the nitrification rate in anoxic tank ranges from60%to70%.(5)The removeal rate of CODcr of air flotation is nearly26%, the removeal rate of SS of air flotation is nearly68%. The removeal rate of CODcr of the combination is nearly98.9%, the removeal rate of NH3-N of the combination is nearly84.6%, the removeal rate of SS of the combination is nearly99.6%.The experiments and practice showed that the main indexes of the final effluent water can reach the discharging limiting numerical value of water pollutants of existing enterprises of discharge standards of water pollutants for pharmaceutical industry fermentation products category(GB21903-2008).