Research Of Diketene, Acesulfame-K Wastewater Treatment Optimization Of Biochemical Process

The Diketene,Acesulfame-K producing wastewater is characterized of the complexcontaminants, the higher Organic matter, nitrogen, phosphorus concentration and thepoor biodegradability. Through the last stage of the study, the iron-carbonmicro-electrolysis+Fenton oxidation+coagulation as the main body pretreatmentprocesses be proposed through the research aimed at the problem which exists inwastewater treatment station of a chemical plant. In this study, the biochemical treatmentprocess optimization has been experimental studied. Identify evaluation and analysis theproblems of biochemical treatment progress through the long-term monitoring ofbiochemical treatment of wastewater. Proposed the ABR-A/O as the main body processoptimization, investigated the effectiveness of different factors on the ABR-A/O processto determine the optimum process operating conditions. And then the cost for the projecttransformation investment and expense were preliminarily estimated.The study results show that:Through the mode of fixed HRT （HRT=110h） and gradually increase the waterconcentration of the matrix can successfully start the ABR-A/O reactor., the granularsludge which particle size of0.5³mm could be cultivated in the reactor. Under thecondition of water flow is0.1L/h, return sludge ratio is50%, nitration liquid reflux ratiois100%and70%for production wastewater, the removal rates for COD, NH₃-N and TPare75%,65%,35%.System of the TP removal efficiency is not ideal, removal rate is30%⁴0%,therefore, the remove of TP mainly through the subsequent chemical precipitation. Theresults show that the optimal drug dosage of FeCl3is9mL/L, the removal rate ofcoagulation and precipitation is70%⁸0%, the effluent TP concentration is0.35⁰.95mg/L.The ABR-A/O reactor has a good adaptability of hydraulic loading, when HRTreduced from110h to22h, the COD removal rate decreased only about13%, NH₃-Nremoval rate decreased only about15%. The COD effluent concentration below80mg/L,NH₃-N effluent concentration below5mg/L, the TP effluent concentration is1.3³.5mg/L. So the ABR-A/O reactor can effectively reduce the concentration of organicmatter.The changes of volume load have a great impact on the decontamination performance of the system. The COD removal rate decreases with the increase of volumeload, and NH₃-N removal rate declines first then increases with the improvement of thevolume load, but the overall removal efficiency is great, COD removal rate is more than75%and NH₃-N removal rate is more than90%.By analyzing the effects of different factors on the efficiency of ABR-A/O reactor,come to the optimal running conditions: HRT of55h, volume load of0.2kgCOD/m3·d,sludge return ratio of100%, nitrification liquid reflux ratio of200%, influent PH is6.8⁷.5. Under the optimum conditions, system for the removal rate of COD, NH₃-N, TN,TP, respectively,86%,98%,73%and42%.Effluent COD concentration <80mg/L,NH₃-N concentration <1mg/L, TN concentration <10mg/L, TP concentration in2to2.5mg/L. Therefore, ABR-A/O process to deal with such wastewater is feasible.