难降解废水的可生化性探讨

Discussion on biodegradability of refractory wastewater

难降解废水一直是水处理领域所关注的热点和难点。通过实际工程中遇到的某化工废水的可生化性研究,简要介绍和分析了采用超声、臭氧、电解、二氧化氯和生物铁法等方法提高难降解废水可生化性的适用情况和优缺点,为类似废水的生物法处理提供了借鉴。本工程采用臭氧+UASB+接触氧化工艺处理后,调试及运行表明,总BOD5和CODCr的去除率能够达到98.0%和97.0%以上,运行稳定,出水水质达到GB8978—1996的Ⅱ级标准,运行费用为3.06元/m3。

The refractory wastewater is always the focus in wastewater treatment field. The biodegradability of the wastewater in an actual project has been studied. The methods and processes are introduced and analyzed to enhance the refractory wastewater biodegradability. They are ultrasound, ozone, electrolysis, chlorine dioxide and iron filings. Their applicability and advantages or disadvantages are also briefly analyzed. And further research of biological treatment for similar wastewater are also presented. After treated by ozone - UASB - contact oxidation process, the debugging and running of this project indicates that the removal efficiency of total BOD5 and total CODCr are over 98.0% and 97.0% respectively. The system are running steadily. The effluent water quality can meet the second class standard of GB 8978-1996. The running cost is 3.06 yuan/m3.