MBR膜工艺在焦化废水深度处理的研究

Experimental Study on the Treatment of Coking Wastewater by MBR Membrane Technology

焦化废水为焦化企业外排废水中水量较大、处理难度较高的一股废水,焦化废水水质特点为:氨氮较高,并且含有氰化物、硫化物等多种有毒有害的物质,成份复杂,水中有机物生物降解难度较大,污染物浓度较高。现有的焦化企业废水处理常用工艺方法以生化法、高级氧化法和物理化学法等三大类,都存在运行复杂,排放水质不稳定等情况。本文以MBR膜工艺对某焦化企业生产废水生化预处理后进行深度处理的中试试验研究。通过实验研究表明:MBR膜工艺处理经预处理后的焦化废水可确保后续RO工艺稳定安全运行,确定MBR系统产水总体SDI<3比例达到80%,满足RO系统进水要求,MBR系统的TMP峰值为0.5bar,均值为0.35bar,对焦化废水COD、氨氮的去除率均达到30%左右,为后续工程设计提供了工艺参数选择和运行依据。

Coking wastewater mainly comes from the process of coking gas, gas purification, chemical product recovery andprocessing. Coking wastewater mainly contains ammonia, phenol, cyanide, sulfide and other organic substances, complexcomposition, also contains cyanide, inorganic fluoride and ammonia nitrogen and other toxic Hazardous substances, higherconcentrations of pollutants. The existing coking enterprises wastewater treatment commonly used methods to biochemical,advanced oxidation and physical chemistry and other three categories, there are complex operation, the discharge of water qualityinstability and so on. In this paper, MBR membrane technology for a eoking enterprise production wastewater treatment of thepilot in the pilot study. The experimental results show that the pretreatment process of MBR membrane can ensure the safe andsafe operation of the subsequent RO process, and determine the total SDI 〈 3 ratio of MBR system to 80%, meet therequirements of RO system water supply, MBR system The TMP peak is O. 5 bar and the mean value is 0.35 bar. The removalrate of COD and ammonia nitrogen in the coking wastewater is 30%, which provides the selection and operation basis for thesubsequent engineering design.