SMAD-BBR组合工艺在高浓度洗涤废水处理中的应用

针对当前化工行业洗涤废水COD高、毒性强、表面活性剂多导致难处理难降解的问题，以青岛市某化工厂生产车间的设备清洗废水为对象，在实验室小试的基础上，设计并建立了处理规模为2.0 m³·d⁻¹的SMAD-BBR组合工艺系统用于处理该洗涤废水。经过4个月的现场调试运行，研究了SMAD-BBR组合工艺对洗涤废水的处理效果。结果表明：SMAD-BBR组合工艺能够有效地降解该化工厂的清洗废水，其中COD去除率为99.1%、NH₃-N去除率为95.6%、TP去除率为82.5%；在稳定运行期间水质波动较大时，出水仍能稳定达标，表明组合工艺具有较强的抗冲击负荷能力；通过增加BBR曝气区中的MLSS，从而提高了生物量，使洗涤废水在曝气处理时泡沫严重的情况得到了有效的解决；经计算，SMAD-BBR组合工艺处理洗涤废水，每年可为该化工厂节约140×10⁴元。通过分析可知，SMAD-BBR组合工艺在处理洗涤废水方面有良好的应用前景。

Application of SMAD-BBR combined system in high concentration washing wastewater treatment

Nowadays, wastewater from chemical industry is characterized as high COD, toxicity and surfactant content, which leads to the difficulty in its treatment and degradation. In this study, the equipment washing wastewater in a chemical plant of Qingdao was taken as treating object, a SMAD-BBR combined process with 2 m3·d−1 wastewater treatment scale was designed and built based on the lab test. Its treatment effect was tested during 4 month-debugging and operation of this combined process. The results show that the SMAD-BBR combined process could effectively degrade the equipment washing wastewater in this chemical plant, of which the removal rates of COD, $ {rm{NH}}_4^{+} $-N and TP were 99.1%, 95.6% and 82.5%, respectively. When the water quality fluctuates greatly during stable operation, the effluent can still reach the standard stably, indicating that the combined process has strong impact load resistance. The biomass in the BBR was increased by enhancing MLSS in aeration zone, the serious foaming problems produced during aeration treatment of washing wastewater could be effectively solved. After economic estimation, treating washing wastewater with SMAD-BBR combined process could save about 1 400 000 yuan cost per year for the chemical plant. The analysis indicates that SMAD-BBR based system has a good application prospect in treating washing wastewater.