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RESEARCH OF CLOGGING MECHANISM AND PICKLING EFFECT ON CORUNDUM AERATOR IN A WASTEWATER TREATMENT PLANT
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摘要: 以无锡市某污水处理厂刚玉曝气器为研究对象，论述了刚玉曝气器堵塞原因及堵塞特征，同时对刚玉曝气器进行酸洗实验，以保证污水处理厂曝气系统稳定运行。结果表明：新旧曝气头混合使用的曝气系统有效运行时间仅为160 d，远低于全新曝气头的曝气系统（840 d），表明运行中的曝气系统曝气头容易堵塞，需及时清洗维护。微生物对刚玉曝气器的堵塞程度基本没有影响，但对判断刚玉曝气器的堵塞状态具有指示作用。刚玉曝气器堵塞程度与有机物、无机物的含量相关，且与总铁含量呈现正相关。酸清洗对恢复刚玉曝气器性能具有较好的提升效果，15% HCl溶液酸洗20 min能使刚玉曝气头氧传质系数由刮泥后的0.5 min-1左右恢复到0.7 min-1左右，接近于全新曝气头氧传质系数，清洗效果良好。Abstract: The reasons and characteristics of clogging corundum aerators from a waste water treatment plant were investigated, and the components of acid pickling from corundum aerators were studied. It was of great significance to the stable operation of the aeration system in the sewage treatment plant. The results showed that the effective operation time of the new and old aerator was only 160 days, far lower than 840 days of the new aerator. It showed that the aerator was easy to block and needed to be cleaned and maintained in time. Microorganism had little effect on the clogging of corundum aerators, but an indicator effect on judging the blockage state of the corundum aerator. The corundum aerator blockage was related to the content of organic and inorganic matters, and had a positive correlation with the total iron content. Acid cleaning could improve the performance of corundum aerator. Pickling with 15% hydrochloric acid solution for 20 minutes could restore the oxygen mass transfer coefficient of corundum aeration head from about 0.5 min-1 to about 0.7 min-1 after scraping mud, which was close to the oxygen mass transfer coefficient of the new aeration head and indicated good pickling performance.
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Key words:
- corundum aerator /
- clogging /
- total iron /
- acid pickling /
- oxygen mass transfer coefficient
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