AOAB工艺处理难降解混合化工污水的挂膜启动

采用AOAB(水解酸化A1+生物接触氧化O+深度水解酸化A2+曝气生物滤池BAF)工艺处理难降解混合化工污水,重点研究工艺挂膜方式和生物膜的驯化。结果表明,采用分段连续式挂膜法进行反应器挂膜,20 d即可完成快速挂膜启动;采用分阶段同步培养驯化法驯化生物膜,30 d内可完成高浓度多组分混合化工污水进水的驯化,最终进水COD 1 456 mg/L,出水COD 324 mg/L,总去除率76.85%,驯化效果显著;整个工艺对COD的降解主要集中在生物接触氧化池和曝气生物滤池,驯化期间生物接触氧化池去除率稳定在40%左右,曝气生物滤池去除率稳定在50%以上。同时,通过对比一段水解酸化和深度水解酸化的VFA(挥发性脂肪酸)产出,表明在高有机负荷进水时,一段水解酸化降解大分子有机物的能力有限,但这些有机物可通过二段水解酸化再次降解,由此体现了AOAB工艺在处理多组分混合型的难降解化工污水的优势。

Biofilm formation and start-up of AOAB system in treating multi-components chemical industrial wastewater

AOAB was employed to treat poor biodegradable chemical industrial wastewater. The biofilm formation and domestication were investigated. Biofilm formation was finished in 20 days. Taking stepwise domestication for 30 days, when AOAB was feed with multi-component industrial wastewater, the COD concentrations in influent and effluent were 1 456 mg/L and 324 mg/L, respectively, the COD removal rate was 76.85%. COD reduction was mainly attributed to O and BAF. Their COD removal rates were 40% and 50%, respectively. The ability of section A1 for degrading organic macromolecule compounds was limited, while section A2 could degrade those compounds further. The fact revealed that AOAB system was competent in treating recalcitrant multi-components industrial wastewater.