水热氧化法处理焦化废水的可行性研究

摘要

Hydrothermal oxidation of coking waste water was studied in this paper for the evaluation of technical feasibility, which provided profitable references for the theoretical investigation and practical application. The decomposition of COD and NH3-N was investigated in a continuous reactor. With hydrothermal oxidation, COD removal rate could reach over 90%. When the temperature was higher than 500 K, the COD concentration of the treated water is lower than 300 mg/L, which could meet the tertiary discharge standard of GB 13456-1992. Residence time was the main factor of NH3,N complete removal, and NH3-N concentration decreased to 2.6 mg/L with the residence time of 12.46min. the temperature of 581 K and the pressure of 15 MPa, which could meet the primary discharge standard of GB 13456-1992.%以焦化废水为研究对象,采用水热氧化技术研究废水处理的技术可行性,具有重大的理论和实际应用价值。在连续式反应器中,研究了实际焦化废水中主要污染物指标COD、NH3-N的降解行为。采用水热法处理焦化废水对COD去除率可达90%以上,当温度高于500 K时,COD浓度可降至300 mg/L以下,达到三级排放标准（GB 13456-1992）。停留时间是NH3-N彻底去除的主要因素。在停留时间达到12.46 min、温度为581 K、压力为15 MPa的亚临界条件下,NH3-N浓度可降至2.6 mg/L,达到一级排放标准。