Experimental Study On Treatment Of Pharmaceutical Wastewater Containing Naphthalene And Strontium By MBBR Process

While in various industrial wastewater,the treatment of wastewater is especially complicated.The wastewater is difficult to deal with in organic industrial wastewater because of its various types of production and production process,complex components,higher toxicity and more complex treatment mechanism.The current research on pharmaceutical industry wastewater is mostly the treatment of pharmaceutical wastewater as a whole,this subject from another point of view,using the typical thinking of environmental pollution treatment-looking for the typical target characteristics of pollutants,the use of this biological activity strengthening technology,combined with the current efficient and mature sewage treatment technology.This paper studies the typical characteristics of refractory organic pollutants-naphthalene and indole in a pharmaceutical factory in Harbin,the optimum treatment process and reasonable equipment parameters of the reactor are discussed,and it is hoped that the effective removal of the target characteristic organic pollutant can be achieved.The research object of this paper is two typical organic pollutants in pharmaceutical industrial wastewater,naphthalene and indole.The active microbial groups for the degradation of naphthalene and indole were obtained by the active domestication of the pharmaceutical industrial wastewater sampled from the target pharmaceutical factory,thus the activated sludge for the target organic pollutant was obtained.After domestication of activated sludge by 3:1 of the proportion of mixed culture,according to past experience,aerobic MBBR process is relatively easy to deal with refractory organic pollutants,so we use aerobic mbbr process.The activated sludge from domestication and culture mixture was put into MBBR reactor for reactor start-up and membrane treatment,and the target pharmaceutical industrial wastewater was studied,and the effects of aeration,impact load and HRT temperature on the removal of indole,naphthalene,NH4+-N and COD were investigated.The optimum technological conditions for the treatment of naphthalene and indole of organic pollutants in pharmaceutical industrial wastewater by aerobic MBBR process were determined.Through high throughput sequencing technology,the microbial strains in the activated Sludge sample library after the naphthalene domestication mainly include Thermomonas(4.31%),Acidovorax(13.7%),which may be the dominant bacteria group for the degradation of naphthalene.The microbial strains in the activated Sludge sample library after indomethacin were mainly Comamonas(34.15%),Acinetobacter(15.65%)and Thermomonas(5.73%),which could be the dominant bacteria group for the degradation of indole.The results showed that the COD removal rate in HRT 8 h COD effluent concentration was 38.2 mg/L,the removal rate reached 89.65%,and the NH4+-N removal rate was 63.43%at 6～18 h.The MBBR process of naphthalene in the HRT is 6 h all removed,indole in the HRT is 8 h when all removed,lower than the national emission standards a standard requirements,comprehensive look at HRT synthesis of HRT 8 h for the treatment of target pharmaceutical wastewater in the target organic pollutants naphthalene and indole the best conditions.The removal rate of COD and NH4+-N in mbbr process was 88.88%～92.95%and 65%～66.83%respectively in the 0.1～0.12 ml/min of aeration gas.The removal rate of naphthalene and indole was stable beyond 99%,while the removal rate of COD and NH4+-N remained at 80%and 40%,which proved that the aerobic MBBR process could effectively deal with the 25～65 mg/L organic pollutant when the influent indole concentration changed in the.In a comprehensive view,the optimum technological conditions for the treatment of organic contaminants in the MBBR process were 0.1～0.12 ml/min.The temperature has obvious influence on the removal rate of COD and NH4+-N in MBBR reactor.In the winter temperature control in the 20±2℃,Spring water temperature control in the 25±1℃,the removal rate of COD for the winter 85.23%,Spring is 92.4%,the difference is 7.16%,the removal rate of NH4+-N for the winter 41.33%,Spring 64.74%,the difference is 23.41%.In a comprehensive view,the spring temperature 25±1℃ is the best technological condition,the COD,NH4+-N removal effect is obvious and the temperature is the key factor.The removal rate of COD in MBBR system is not very different from impact load,when the naphthalene impact load is 5,8,12,15 mg/L,indole impact load 25,35,50,65 mg/L,COD effluent concentration is 42.8 mg/L,and COD removal rate reaches 90.5%on average.Below the national emission standard level a standard requirements.The effluent concentration of NH4+-N in MBBR system is 50.5 mg/L,and the average removal rate is 49.5%.The removal rate of naphthalene and indole reached the target removal rate.