The Combined Influence Of Heavy Metals And Antibiotics On Continuous Flow Swine Wastewater Treatment System

With the rapid development of pig farming industry, a large amount of swine wastewater generated. Due to farmers by profit-driven, swine wastewater contains heavy metals and antibiotics. Few Scholars study on their effects of continuous flow swine wastewater aerobic treatment system. Therefore, the appropriate research was done. The pulse experiment which in order to obtain hydrodynamic characteristics of the BCO reactor used methylene blue as the tracer. Experiments study on combined influence of selected concentration of Cu(Ⅱ), Zn(Ⅱ) and OTC, CTC on continuous flow system(BCO + SBBR) are conducted, the electrochemical method was adopted to remove Cu(Ⅱ), Zn(Ⅱ), OTC and CTC, explore the suitable processing conditions.The experimental conclusion was as follows:(1) Pulse experiment got some parameters of the BCO reactor, the average residence time T was 1258 min, the variance was 1187213.95 min2 and dimensionless variance was 0.75. The fluid in BCO reactor was biased to completely mixed. Level 2 series CSTR can be used in simulating the retention time distribution function of BCO reactor. In view of the reactor flow characteristics, puts forward improving reactor hydraulic layout, change the aeration mode, appropriately increase flow and other measures.(2) Cu(Ⅱ), Zn(Ⅱ), OTC, under the joint action of CTC, would affect the wastewater treatment effect of BCO reactor. The effluent COD, NH3-N, TP respectively in 2,4,4 days to reach a maximum of 606, 212.8,18.3mg/L. The activity of sludge in the third and fourth day was maximum inhibited, TTC- ETS and INT-ETS inhibition rate were 35% and 21% respectively. Late after domestication, microorganisms in the system have adapted waste water containing the levels of heavy metals and antibiotics.(3) Cu(Ⅱ), Zn(Ⅱ), OTC, under the joint action of CTC, would inhibit the treatment effect of SBBR system. Long-term experiment showed that inhibition of removing ammonia nitrogen was greater than the removal of COD. The activity of sludge in the third was maximum inhibited, TTC- ETS and INT- ETS inhibition rate were 25% and 17% respectively. Due to the sludge loss and inadequate access to energy, poor treatment systerm restore.(4) With TTC- ETS was more sensitive than INT- ETS to characterize the impact on the sludge activity.(5) The longer the electrolysis time, the more fully the process was. When p H was 4, copper and zinc removal effect was good, when p H was 8, copper, zinc could quickly precipitation and remove effect was better also. And higher removal rate of oxytetracycline, chlortetracyclin in alkaline condition. Relatively low concentration of Cu(Ⅱ), Zn(Ⅱ), OTC, COD, and the other ions in waste water was advantageous to the electrolytic reaction, concentration decreased with too much was bad for electrolysis. Experiment to get the optimum electrolytic conditions was electrolytic p H of 8, and electrolytic time was 45 min, electrolysis voltage was 5 v, the removal rate of copper, zinc, oxytetracycline, chlortetracycline and COD were 48.5%, 41.2%, 73.2%, 64.3%, 42.2%.