Research On Treatment Process Of Pharmaceutical Wastewater By Fenton Oxidation Cooperated With Ultrasound And Biochemical

At this stage,water resource scarcity and polluted have seriously hampered the country’s economic development and national well-being, especially in the pharmaceutical industry wastewater. Because pharmaceutical wastewater have high concentration of organic matter and complex composition and toxic and hazardous, and it is difficult to meet the standard of water discharge by single treatment, the advanced oxidation treatment of ultrasound cooperated with Fenton oxidation and flocculation physic-chemical treatment that was used as the core of combining with biological treatment in anaerobic(UASB)、aerobic(SBR) ware studied in this paper.The effects of PFC’s doses, alkalinity, water initial pH, agitation intensity for removal of organic matter were investigated during Physic-chemical treatment flocculation stage. The result showed, the doses of PFC, alkalinity and water initial pH had a great impact on the removal of organic matter, but agitation intensity opposites. The higher degree of alkalinity was, the more dose of PFC was used. At the same low doses of PFC, the choma gradually increased with the value of PFC B. it indicated that adsorption and charge neutralization play a mainly role in coagulation. While at same high doses of PFC, coagulation showed significant difference between the low doses, it indicated that aggregation function and adsorption and charge neutralization played combined function. The optimum condition is that the water initial pH was 7.0 and the alkalinity of PFC was 0.6, and the doses of PFC was 5.0 mmol/L, and agitation intensity was 29496 GT(ie 210 r/min rapid stirring 2 min).At this point the removal rate of CODcr reached 59.5%.The removal efficiency of organic in wastewater by ultrasonic synergy of Fenton technology was investigated in acidic conditions. At the same time the influence of pH, the concentration of H2O2 and Fe2+, ultrasonic power and the reaction time ultrasonic power on the ultrasound-Fenton reagent degrading pharmaceutical wastewater were also investigated. The experimental results showed that the removal efficiency of CODcr after combined Fenton reagent with ultrasonic was superior to only using Fenton reagent and ultrasonic. The best process parameters of ultrasound-Fenton reagent degrading pharmaceutical wastewater were found. The optimum condition is that the Ultrasonic power was 70 W, p H value was 3.5, the concentration of H2O2 and Fe2+ were 4.7 mmol/L and 7.0 mmol/L,and the reaction time was 30 min, chroma of water was 6 times,and the removal of chroma reached 97.0%,CODcr and UV254 were 113mg/L and 0.004,the removal rate of CODcr and UV254 reached 73.0% and 98.4%, respectively. The water quality can meet the requirements of China national standards for polluted water quality(GB21903-2008).