The Experimental Study On Treating Flavors And Fragrances Wastewater By Using Combined Processes Of EGSB+SHARON+UAF

Chemical oxygen demand (COD) of organic wastewater generated by theflavor and fragrance industry is high which contains compounds (such asammonia, polycyclic aromatic hydrocarbons, carcinogens such as benzene andso on).It is high concentration,toxic and hazardous, nonbiodegradableorganic wastewater, the harm is very large.It can cause aquatic poisoning, cropfailures and various diseases if discharged into water without anytreatment.The efficiency of traditional water treatment technology of highconcentration，nonbiodegradable wastewater is limited, it is very meaningfulto study effective ways to solve the problem of sewage treatment. The organiccomponents of the wastewater of this subject contains a large number ofaromatic hydrocarbons, aromatic compounds and their derivatives, etc., asmany as20kinds, which also includes toxic and hazardous substances, suchas phenols, toluene, benzaldehyde,etc.A large number of surfactant is added inthe processes such as washing reaction kettle. Therefore,the wastewater ofhigh sour alkalinity, concentration, chroma and toxicity, complex compositionof water pollution sources,water quality fluctuations,is difficult to be treateddirectly by biochemical methods.It is typical of the high concentration ofnonbiodegradable organic wastewater.Physicochemical pretreatment must beused to reduce biological toxicity and improve the biodegradability beforebiochemical treatment. The treatment effect of using Fenton-thermokalite wasstudied,the impact of Fenton-thermokalite on COD removal efficiency wasinvestigated at different pH, temperature, dosage and reaction time and got theoptimum conditions of the processing method. The results showed,at pH=3,H2O2dosage of20mL/L, FeSO47H2O dosage of2g/L, reaction time of3h,the COD removal efficiency can reach53%. At pH=11,100°C, pyrolysistime of15min, the COD removal efficiency can reach40%. Under optimumconditions, the COD removal efficiency of the joint process of Fenton andthermokalite can reach77%.Using pretreatment of Fenton-thermokalite onflavors and fragrances wastewater have better removal effect on COD andchroma,it provided favorable conditions for subsequent biochemicalprocessing. Subsequent application of EGSB (Expanded Granular Sludge Bed)+SHARON+UAF (Upflow anaerobic filter) combined process deal with twodifferent water quality flavors and fragrances wastewater achieved goodresults.In the experiment of treating the wastewater of the regulation pool in aflavors and fragrances factory, Run lasted28days, COD removal efficiency is more than90%stably, the effluent COD concentration is less than200mg/Lin the operation lasted28days. Effluent ammonia nitrogen removal rate ismore than95%stably, the effluent ammonia concentration is less than10mg/L.In treating wastewater from anteroposterior lactone workshop of a flavorsand fragrances factory, in the operation lasted43days, COD removal rate ismore than90%stably and the effluent COD concentration is less than500mg/L. Effluent ammonia nitrogen removal rate is more than95%stably, theeffluent ammonia concentration is less than10mg/L. Influent organic loadingcontinuously improve during the operation,COD of two kinds of wastewater isstabe at3000mg/L, ammonia nitrogen of first wastewater is stable at100mg/L, ammonia nitrogen of second wastewater is stable at200mg/L at last.Itshows that this process system has a certain resistance to shock loading.