Study on Chlortetracycline Pharmaceuticai Wastewater Treatment by Integral Anammox Process
|School||Beijing Jiaotong University|
|Keywords||antibiotic wastewater ANAMMOX integral Chlortetracycline biological nitrogen removal|
It is well known that antibiotic wastewater, which contains vestigial antibiotics and complicated organic organic substance, with high ammonia, high sulfate and toxicity characteristics, is recognized as a difficulty and emphasis in the sewage treatment. In recent years, our countryis making higher and higher emission standards for nitrogen in wastewater. Traditional biological nitrogen removal technology is difficult to meet the requirements of wastewater treatment and environmental protection, and the new pharmaceutical wastewater denitrification process development and application is getting more and more attention. In this test, a new type of integrated anaerobic ammonium oxidation process was performed to treat chlortetracycline pharmaceutical wastewater. The process were investigated anaerobic and aerobic treatment with combined operating conditions biological denitrification performance, and examined the organic matter on the system performance, especially nitrification process.The reactor was a continuous flow plug-flow reactor, the wastewatet flowed up and down between the different staggered grid chambers.In the tests, the nitrosation reaction was first to be built up. After the nitrosation reaction was stable, dose biofilm-typeintegrated anammox sludge filler to start up the process. Monitore and analyse the various indicators of influent and effluent water during the tests. And the results indicated:1、In the process of treating chlortetracycline wastewater with high concentration of ammonia, the nitrification could easily start in the condition of the reactor influent pH was7.0-8.5, the temperature was32-34℃, DO was0.8-1.4mg/L, the concentration of NH4+-N was120mg/L, and the concentration of CODcrwas500mg/L. The nitrification was operating stably and nitrosated cumulative rate was above90%when the concentration of NH4+-N was120-600mg/L and the concentration of CODCr was500-2000mg/L in the influent water. In the case of high concentration of CODCr (>2000mg/L), nitrification could be significantly inhibited and the nitrite accumulation rate was reduced to10%. The inhibition could be weakened after the concentration of CODcr was reduced to1000mg/L. The nitrosation level could be recovered to70%in15days. 2、 Select the effluent of chlortetracycline two UASB anaerobic treatment of wastewater for the study, study integrated anaerobic ammonium oxidation process of denitrification. The water diluted8-fold from a gradual transition to1.33-fold dilution. The stable nitrogen removal could get in the condition of the influent pH was8.0-8.5, the temperature was32-34℃, DO was0.4-0.8mg/L and the HRT was32-16h When the concentration of NH4+-N and TN in the influent water was600mg/Land620mg/L, the ammonia nitrogen and the total nitrogen removal rate was both up to80%, the concentration of NH4+-N and TNin the effluent water was80-100mg/L and100mg/L, and the total nitrogen volume load was up to1.0kgN/(m3·d).3、Select aerobic wastewater chlortetracycline (CASS) treated effluent for the study, study the denitrification of the integrated anaerobic ammonium oxidation process. The best treatment could get in the condition of the aeration rate was50L/min, the DO was0.3-0.4mg/L, the influent flow was60L/d, hydraulic retention time was24h and the pH was7.5-8.5. In this condition, when the concentration of total nitrogen was600mg/L, the concentration of ammonia was300mg/L in the influent water, the concentration of total nitrogen could be150-200mg/L and the the concentration of ammonia could be10mg/L or less in the effluent water. The total nitrogen removal rate was up to80%, more than90%ammonia could be removed and the TN volume load was0.6kgN/(m3·d).The results showed that it could achieve stable nitrification under suitable conditions in treating antibiotic wastewater, and the concentration of COD in influent is an important factor in keeping nitrification stability. The integrated anammox process could combine with both anaerobic and aerobic treatment, and two combinations of processes could achieve good nitrogen removal.However, this test did not perform from the microbiological point of view of the mechanism of in-depth, and the research on water quality studies in the substrate concentration was not comprehensive as well. In the future experimental experimental studies, these would be the importance and difficulty that should be focus on solving.