Study On The Treatment Of Antibiotic Wastewater By Imbeded Compound Microorganisms

The imbeded compound microganisms is a new wastewater treatment technologyand has been successfully applied in the treatment of various wastewater. However, thistechnology is seldom applied in treating antibiotic wastewater. Therefore, in response tothe research status, the author tried to do some further exploration on the application ofimmobilized compound bacteria in the treatment of antibiotic wastewater, and providedsome reference materials for subsequent researchers.First, in this study, three yeast strains, three actinomycete strains and threephotosynthetic bacteria were isolated from the actual antibiotic wastewater treatmentsystem, and then the removing efficiencies of COD in antibiotic wastewater by thesestrains were comparied. Second, based on the results of single-strain dosageexperiments and orthogonal experiments, the optimum amounts of photosyntheticbacteria, yeasts, and actinomycete in the compound microganisms were determined.Third, by comparing the properties of beads made from different imbeded materials andremoving efficiencies of COD in antibiotic wastewater, the contents of the differentcomponents in the imbeded materials were determined. Finally, the impacts oftemperature, pH, and influent COD concentration on the removing efficiencies of CODin antibiotic wastewater were investigated, and the dynamics of treatment process wasalso preliminary studied. Therefore, this study gained the following conclusions:①Yeast1#, actinomycete3#and photosynthetic bacteria2#had the best CODremoving efficiencies.②After compounding, the yeast1#, photosynthetic bacteria2#and actinomycete3#had interaction and could increase the COD removal efficiency. The results oforthogonal experients and variance analysis showed that: in the process of treating CODby compound microorganisms, photosynthetic bacteria2#played a key role, followedby yeasts1#, and actinomycete3#’s role is relatively minor; the optimum amounts ofphotosynthetic bacteria2#, yeasts1#, and actinomycete3#were10g/L,6g/L and2g/L,respectivly.③Mixed PVA-carrageenan was more suitable for embedded carrier. Moreover,appropriate addition of bentonite could significantly improve the mass transferperformance of embedded beads. The results of orthogonal experients and varianceanalysis showed that: PVA had the greatest impact on the perforemance of embedded beads to remove COD in antibiotic wastewater, followed by bentonite, andcarrageenan’s impact is relatively small; the optimum concentrations of PVA,carrageenan and bentonite in embedded material were11%（w/v）,0.5%（w/v）,2.5%（w/v）, respectively.④When using compound microganisms to treat antibiotic wastewater, there wereoptimum temperature, pH, and influent COD concentration range. Imbedment enhancedthe resistibility of compound bacteria to extreme conditions and broadened the range ofoptimum temperature, pH and influent COD concentration from25-30°C,5.5-7.5,6000-7000mg/L to15-35°C,5.5-9.5,6000-8000mg/L. Under these optimal conditions,after6-days’ treatment the imbeded compound microganisms could remove60%ofCOD in antibiotic wastewater, and the variation of COD removal efficiency could besimulated by power function.The empirical equation was as follows:μ=2.556t^0.6125In conclusion, this study proposed that the treatment of antibiotic wastewater byimbeded compound microganisms was technically feasible, and had the significance forpopularization.