The Research On The Technique Of Recovery Energy And Discharge Standards Of Pharmaceutical Wastewater From Certain Pharmaceutical Factory In Sichuan

The certain wastewater of pharmaceutical factory in Sichuan was a kind of wastewater containing high-concentration organic matter, and chemical oxygen demand(COD) was usually up to 80000~140000mg/L. This wastewater contained single nutrient, so the nutrient that was essential for microbial growth was added when treating the pharmaceutical wastewater of dextran by anaerobic biogas fermentation technology. The research on the anaerobic biogas fermentation technology of dextran showed:(1) The optimum nutrient fomula for anaerobic fermentation of the certain pharmaceutical wastewater was gained through the orthogonal experiment. The fomula was that the concentration of N, P, NiCl2·2H2O,CoCl2·2H2O,FeSO4·7H2O were 400mg/L,100 mg/L,10.0 mg/L,5.0 mg/L,100 mg/L in 1L wastewater, repectively. N had significant effect on the anaerobic fermentation of dextran.(2)The anaerobic biogas producing fermentation in the laboratory showed that the stable running load could reach 8.0 kgCOD/m3·d, the maximum volumetric organic loading was up to 14.9 kgCOD/m3·d and the hydraulic retention time (hrt) was 8h best after 47d debugging starting. The accumulation of propionic acid in the fermentation process could lead to the failure in the running process, so the concentration of volatile fatty acid (VFA) should be controlled under 1000mg/L.(3) Under the medium temperature condition, the biogas engineering could run normally after 55d debugging. The volumetric organic loading was up to 2.24 kgCOD/m3·d, and the influent COD was 140000mg/L. 1ton wastewater could produce 76m3 biogas on average, and the removal efficiency of COD was achieved 96.97% after the primary anaerobic treatment. After three-stage anaerobic treatment, the effluent COD decrease to 656mg/L. COD and ammonia-nitrogen concentration of the wastewater treated by anaerobic process decreased to 80～100 mg/L and 8～12 mg/L after aerobic process, respectively, and the index of wastewater reached discharge standard.(4) The biogas engineering could produce 20000m3 biogas per month on average, so we could save the fuel cost more than $20000.(5) Biochemical method was difficult to remove the total phosphorous in the wastewater. The total phosphorous concentration and SS decreased to 0.28mg/L and 3～10 mg/L, respectively when using Magnetic separation technology as the follow-up treatment to purify water body.