AAOO短时好氧工艺处理辛辣类调味品废水中试实验研究

Pilot Scale Study on Treatment of Spicy Condiment Wastewater by a New Short-Time Aerobic Process

辛辣类调味品废水含有辣椒素,显著抑制生化系统微生物(尤其好氧细菌),对常规A/O工艺冲击较大;课题组自制中试规模AAOO短时好氧装置,使聚磷菌(PAOS)和硝化菌分别在短时好氧池和生物接触氧化池形成优势菌群,以期规避辣椒素生物毒性冲击,并有效去除调味品废水特征因子总磷(TP)。结果表明,挂膜40 d时原水COD、NH_(4)^(+)-N、TP的去除率分别达到87.4%、80.3%、89.4%;进水量10 L·min^(-1),硝化液回流比150%、曝气量50 L·min^(-1)时系统运行状态最佳,COD、NH_(4)^(+)-N、TP去除率分别达到95%、88%、96%;系统连续稳定运行80 d,出水COD、NH_(4)^(+)-N、TP数值分别稳定在55、6.5、0.5 mg·L^(-1)以下,达到GB 8978—1996一级标准;各工艺段污水荧光图谱分析结果显示,短时好氧工艺能显著降低类辣椒素有机物荧光强度,仅存较难处理的类富里酸和腐殖酸类特征峰,由此说明AAOO短时好氧组合工艺在一定程度上可降低辣椒素生物毒性,这或许为AAOO工艺应用提供了更广阔的思路。

Spicy condiment wastewater contains capsaicin,which significantly inhibits microorganisms in the biochemical system(especially aerobic bacteria),and has a great impact on the conventional A/O process.The research group has self-made pilot scale AAOO short-time aerobic device,which enables phosphorus accumulating bacteria and nitrifying bacteria to form dominant bacteria groups in the short-time aerobic tank and biological contact oxidation tank respectively,in order to avoid the impact of biological toxicity of capsaicin and effectively remove the characteristic factor TP of condiment wastewater.The results showed that the removal rates of COD,NH_(4)^(+)-N and TP in raw water reached 87.4%,80.3%and 89.44%after 40 d membrane deposition;When the influent volume was 10 L·min^(-1),the reflux ratio of nitrification solution was 150%and the aeration volume was 50 L·min^(-1),the system operates in the best state,and the removal rates of COD,NH_(4)^(+)-N and TP reach 95%,88%and 96%respectively;The system operated continuously and stably for 80 d,and the effluent COD,NH_(4)^(+)-N and TP values were stable below 55 mg·L^(-1),6.5 mg·L^(-1)and 0.5 mg·L^(-1),reaching the class I standard of GB8978—1996.The analysis results of fluorescence spectra of wastewater from each process section showed that the short-time aerobic process significantly reduced the fluorescence intensity of capsaicin like organic matter,and only the characteristic peaks of fulvic acid like and humic acid that are difficult to treat remained.This showed that the AAOO short-time aerobic combined process can reduce the biological toxicity of capsaicin to a certain extent,which may provide a broader idea for the application of AAOO process.