Study On Pharmaceutical Wastewater Treatment By Combined Two-phase Anaerobic, Aerobic And Anammox Process

It is well known that antibiotic wastewater,which contains vestigial antibiotics, high ammonia, high sulfate and complicated organic substance establishes emphasis and difficulty in the sewage treatment. In this study, the test water is chlortetracycline wastewater from actual production. Basing on the feature of antibiotic wastewater, the treatment apply combined two-phase anaerobic, aerobic and anammox process, inspecting the effects of treatment and the regular pattern for degradation of pollutant substance.Firstly, the study inspects the quick start and treatment effects of the two-phase anaerobic, aerobic technics., optimizing operating parameters of each unit. And then, the paper analyzes the different elements of short range nitration and Anammox, establishing the integrated control to keep high effective short range nitration and stable Anammox.The research indicates that:(1)In the influent COD4000-18000mg/L, the COD removal of combined process is 94%-98%, including 77% in the two-phase UASB, the COD in effluent is less than 1000mg/L,514mg/L in average. The raw water, pH 4.0-6.0,5.25 in average, belongs to acidity wastewater. The pH of ultimate effluent is 7.7-8.5, and 8.12 in average. The nitrogen of raw water is 100-800mg/L,530mg/L in average. The removal of nitrogen in the combined process is above 90%,96.9% and 15.6mg/L in average. The total nitrogen of raw water is 200-1000mg/L,624.4mg/L in average, the total nitrogen of effluent is generally under 100mg/L,59.2mg/L in average, after the combined combined two-phase anaerobic,aerobic and anammox process. The removal of total nitrogen is between 80% and 95%,89.5% in average.(2)The main control factors to achieve and maintain short range nitration are free ammonia (FA) and dissolved oxygen (DO), and the control requirements for the accumulation rate of NO2--N above 90% in the short range nitration are FA≥30mg/L, DO≤0.5mg/L, high pH condition(pH7.5-8.5), and rich basicity(≥90mg/L).(3)The main control factors to achieve stable anaerobic ammonium oxidation reaction contain the proportion of influent substrate, pH and temperature. In this study, the proportion of influent substrate is 1:1, the steady density of NH4+-N and NO2-N(≤200mg/L), appropriate pH water environment(pH7.8-8.5), sufficient basicity (≥40mg/L), and invariable temperature, about 33℃±1℃,(4)By promoting the influent load gradually, the test could achieve stable ANAMMOX reaction, attaining efficient removal of ammonian, nitrite nitrogen, and total nitrogen(ammonian≥90%, nitrite nitrogen≥90%, total nitrogen≥80%).The results show that the process is feasible and stable, and could achieve favorable treatment effect to the antibiotic wastewater.