Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan.
Bioresour Technol. 2010 Jun;101(12):4349-53. doi: 10.1016/j.biortech.2010.01.087. Epub 2010 Feb 11.
The magnetic activated sludge (MAS) process is a modification of the conventional activated sludge process to improve the solid-liquid separation characteristics. It was developed to reduce the production of excess sludge and the time required for the conventional activated sludge process. In this study, actual milking parlor wastewater was treated with a MAS process and no sludge was removed. The effectiveness of continuous aeration and intermittent aeration in removing organic matter and nitrogen were compared. Both processes were highly efficient at removing chemical oxygen demand (COD) (averaged 91% removal) and ammonium nitrogen (NH(4)-N) (averaged 99% removal). In marked contrast to the continuous aeration process, the 30-min aeration/90-min non-aeration cycle of the intermittent aeration process rapidly reduced the nitrate nitrogen (NO(3)-N) concentration to near-zero. This result indicates that NO(3)-N was almost completely denitrified via nitrite nitrogen (NO(2)-N) to nitrogen gas. Removal of organic material and nitrogen can be considered to have occurred simultaneously in the single tank of the MAS process.
磁活性污泥（MAS）工艺是对传统活性污泥工艺的一种改进，以改善固液分离特性。它的开发是为了减少过量污泥的产生和传统活性污泥工艺所需的时间。在这项研究中，实际的挤奶厅废水通过 MAS 工艺处理，没有去除污泥。比较了连续曝气和间歇曝气在去除有机物和氮方面的效果。这两种工艺对化学需氧量（COD）（平均去除率为 91%）和铵态氮（NH4-N）（平均去除率为 99%）的去除都非常有效。与连续曝气工艺形成鲜明对比的是，间歇曝气工艺的 30 分钟曝气/90 分钟非曝气循环迅速将硝酸盐氮（NO3-N）浓度降低到接近零。这一结果表明，NO3-N 几乎完全通过亚硝酸盐氮（NO2-N）被反硝化生成氮气。在 MAS 工艺的单个池中，可以同时考虑去除有机物质和氮。
