| 微好氧水解酸化在石化废水预处理中的应用研究 |
| 摘要点击 2467 全文点击 1311 投稿时间：2015-03-10 修订日期：2015-05-19 |
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| 中文关键词 石化废水 微好氧水解酸化 挥发性脂肪酸 相对分子质量分布 生物降解性 硫酸盐还原 |
| 英文关键词 petrochemical wastewater micro-aerobic hydrolysis acidification volatile fatty acids molecular weight distribution biodegradability sulfate reduction |
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| 中文摘要 |
| 应用微好氧水解酸化技术对北方某石化污水厂进行了改造,投产后对其进行了跟踪监测. 结果表明,在进水COD为490.3~673.2mg·L-1,水力停留时间(HRT)为24 h以及溶解氧(DO)控制在0.2~0.35mg·L-1条件下,监测阶段内COD的平均去除率为11.7%,出水和进水相比,BOD5/COD提高了12.4%,UV254值降低了11.2%,挥发性脂肪酸(VFA)浓度升高了23.0%. 相对分子质量分布测定和好氧生物降解性试验结果表明: 石化废水采用微好氧水解酸化预处理后,小分子有机物(<1×103)所占比例由59.5%提高至82.1%,而大分子有机物(>100×103)所占比例由31.8%降低到14.0%. 经微好氧水解酸化预处理后降解性有显著提高,原水COD经48 h好氧处理可降至102.2mg·L-1,而微好氧水解酸化出水COD经48 h好氧处理可降解至71.5mg·L-1. 微好氧水解酸化出水的SO42-浓度[(930.7±60.1) mg·L-1]高于进水[(854.3±41.5) mg·L-1],表明微好氧环境对硫酸盐还原菌(SRB)有抑制作用. 由于硫酸盐的还原受到抑制,减少有毒和恶臭类气体产生,改善了周围环境. |
| 英文摘要 |
| Micro-aerobic hydrolysis acidification technology was applied in the reconstruction of ananaerobic hydrolysis acidification tank in a north petrochemical wastewater treatment plant.After put into operation, the monitoring results showed that the average removal rate of COD was 11.7% when influent COD was 490.3-673.2mg·L-1, hydraulic retention time (HRT) was 24 and the dissolved oxygen (DO) was 0.2-0.35mg·L-1.In addition, the BOD5/COD value was increased by 12.4%, the UV254removal rate reached 11.2%, and the VFA concentration was increased by 23.0%.The relative molecular weight distribution(MWD) results showed that the small molecule organic matter(<1×103)percentage was increased from 59.5% to 82.1% and the high molecular organic matter(>100×103) percentage was decreased from 31.8% to 14.0% after micro-aerobic hydrolysis acidification.The aerobic biodegradation batch test showed that the degradation of petrochemical wastewater was significantly improved by the pretreatment of micro-aerobic hydrolysis acidification.The COD of influent can be degraded to 102.2mg·L-1 by 48h aerobic treatment while the micro-aerobic hydrolysis acidification effluent COD can be degraded to 71.5 mg·L-1on the same condition.The effluent sulfate concentration of micro-aerobic hydrolysis acidification tank [(930.7±60.1) mg·L-1]was higher than that of the influent [(854.3±41.5)mg·L-1], indicating that sulfate reducing bacteria (SRB) was inhibited.The toxic and malodorous gases generation was reduced with the improvement of environment. |
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