RESEARCH OF CLOGGING MECHANISM AND PICKLING EFFECT ON CORUNDUM AERATOR IN A WASTEWATER TREATMENT PLANT

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.