|
DOI : 10.17640/KSWST.2020.28.2.3 , Vol.28, No.2, 3 ~ 12, 2020
|
| Title |
| Comparison of Nitrification of ZBAF According to Ammonia Nitrogen Ion Exchange Capacity of Zeolite Media |
| 김진수 Jin-su Kim , 최승규 Seung-kyu Choi , 주천 Qian Zhu , 신관우 Gwan-woo Shin , 양창환 Chang-hwan Yang , 원경자 Kyoung-ja Weon , 이상일 Sang-ill Lee |
|
|
|
| Abstract |
| This study was conducted to investigate nitrification by measuring the ammonia nitrogen adsorption ability of zeolite media. Zeolite adsorbs ammonia nitrogen through cation exchange. When zeolite is used as the filteration media in biological aerated filters (BAF), nitrifying bacteria can be easily attached. Using two types of zeolite that have different calcination temperatures, it was confirmed differences in nitrification rate relative to the ammonium ions exchange capacity of the zeolite media. The strength of the zeolite media was higher as calcination temperature was higher, while BET specific surface area was decreased. The ammonia nitrogen adsorption of the zeolite media at 600℃ was higher than at 900℃, but nitrification rates were similar when either media was used for the zeolite biological aerated filter (ZBAF). During the entire operation period, the 600℃ zeolite had an ammonia nitrogen removal rate of 0.31 kg/m3/d, and the 900℃ zeolite media had a rate of 0.28 kg/m3/d (p>0.05). When the influent was held on shutdown for a month and processing began again, the nitrification rate of the ZBAFs showed a similar amount of NOx-N (sum of the concentration of nitrite and nitrate nitrogen) production within two days of reoperation that was similar to the rate before shutdown. The effect of water temperature had little effect on rate. Ammonia nitrogen removal by ZBAFs was maintained in water temperatures as low as 5℃. However, the ammonia nitrogen removal and nitrification rate were decreased in 600℃ zeolite media after 3 months of operation because media’s morphology changed. |
|
|
| Key Words |
| Low water-temperature, Nitrification, Zeolite, Zeolite biological aerated filter, 저수온, 질산화, 제올라이트, 제올라이트 호기성 생물여과 |
|
|
|
|
|
PDF