K D Double Salt Initiation Of Drug Production And Wastewater Treatment Technology

With the aim of treating the harmful substances contained in the K·D double salt primary explosive wastewater, such as lead ions, picric acid (TNP) and high concentration of nitrate, combined process composed of chemical precipitation, biological aerated filter and anoxic/oxic-membrane bioreactor, was used to deal with the wastewater, with the efficient microbe-biological aerated filter system as core.For the treatment of picric acid, the biological aerated filter (BAF) was inoculated with a picric acid-degrading strain of Rhodococcus sp.NJUST16, which was isolated in our lab. Within 19 days of continuously operation, the form-film of the system succeeded. It is found that nitrite-oxidizing occurred spontaneously during TNP degradation in the BAF system, could have positive influence on TNP wastewater treatment. The BAF can degrade the synthetic wastewater which contained 1500mg/L TNP, with the COD and TNP removal rates of 90.6±3.0% and 98.6±1.0%, respectively. The maximum apparent TNP volumetric removal rate was observed to be 2.53gTNP/Ld. The results indicated that significant mineralization of TNP occurred in the BAF. Overloading of TNP inhibited the nitrite-oxidizing activity and TNP degradation, resulting in the poor TNP degradation performance in the BAF system. The result of microbial community DNA profiling determined by denaturing gradient gel electrophoresis (DGGE) indicated that the bacterial community in the BAF system remained relatively stable and contained only a few major bacterial groups, with the dominance of Rhodococcus sp.NJUST16. Two simple empirical models for the organic substrate degradation were developed in the BAF. The two models could be used to predict the COD removal profiles at different influent flow rates and influent COD concentration.The combined process composed of chemical precipitation, biological aerated filter and anoxic/oxic-membrane bioreactor, was used to deal with K·D double salt primary explosive wastewater, showing it feasible in technique. The treatment effect can reach the discharge standard for water pollutants from ordnance industry (GB 14470.2-2002), with the Pb²⁺, picric acid and nitrate in the K·D double salt primary explosive wastewater harmlessly treated.