微氧水解酸化在石化废水预处理中的应用

[Application of Micro-aerobic Hydrolysis Acidification in the Pretreatment of Petrochemical Wastewater].

作者信息

Zhu Chen, Wu Chang-yong, Zhou Yue-xi, Fu Xiao-yong, Chen Xue-min, Qiu Yan-bo, Wu Xiao-feng

出版信息

Huan Jing Ke Xue. 2015 Oct;36(10):3738-42.

Abstract

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 490.3-673.2 mg x L(-1), hydraulic retention time (HRT) was 24 and the dissolved oxygen (DO) was 0.2-0.35 mg x L(-1). In addition, the BOD5/COD value was increased by 12.4%, the UV254 removal 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 x 10(3)) percentage was increased from 59.5% to 82.1% and the high molecular organic matter ( > 100 x 10(3)) 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 102.2 mg x L(-1) by 48h aerobic treatment while the micro-aerobic hydrolysis acidification effluent COD can be degraded to 71.5 mg x L(-1) on the same condition. The effluent sulfate concentration of micro-aerobic hydrolysis acidification tank [(930.7 ± 60.1) mg x L(-1)] was higher than that of the influent [(854.3 ± 41.5) mg x L(-1)], indicating that sulfate reducing bacteria (SRB) was inhibited. The toxic and malodorous gases generation was reduced with the improvement of environment.

摘要

微氧水解酸化技术应用于北方某石化污水处理厂厌氧水解酸化池的改造。运行后监测结果表明，进水化学需氧量（COD）为490.3 - 673.2 mg·L⁻¹、水力停留时间（HRT）为24 h且溶解氧（DO）为0.2 - 0.35 mg·L⁻¹时，COD平均去除率为11.7%。此外，生化需氧量/化学需氧量（BOD₅/COD）值提高了12.4%，254 nm紫外吸光度（UV₂₅₄）去除率达到11.2%，挥发性脂肪酸（VFA）浓度提高了23.0%。相对分子质量分布（MWD）结果显示，微氧水解酸化后小分子有机物（<1×10³）占比从59.5%提高到82.1%，高分子有机物（>100×10³）占比从31.8%降至14.0%。好氧生物降解批次试验表明，微氧水解酸化预处理显著提高了石化废水的降解效果。在相同条件下，进水COD经48 h好氧处理可降解至102.2 mg·L⁻¹，而微氧水解酸化出水COD可降解至71.5 mg·L⁻¹。微氧水解酸化池出水硫酸盐浓度[（930.7±60.1）mg·L⁻¹]高于进水[（854.3±41.5）mg·L⁻¹]，表明硫酸盐还原菌（SRB）受到抑制。随着环境改善，有毒恶臭气体的产生减少。