Lee S, Basu S, Tyler C W, Pitt P A
Louisiana Water Resources Research Institute, Louisiana State University, 3221 CEBA Building, Baton Rouge, LA 70803, USA.
Environ Technol. 2003 Jul;24(7):855-65. doi: 10.1080/09593330309385622.
The Deer Island Treatment Plant (DITP) treating both domestic and industrial wastewater, has a peak flow capacity of up to 1270 million gallons per day (MGD) (3342 m3 min(-1). The DITP contains a Pilot Plant, which consists of two identical pure oxygen activated sludge treatment trains, each with a maximum capacity of 1 MGD (2.63 m3 min(-1)) to simulate the maximum flow of the full size facility. This study documents the community of filamentous organisms living in the activatedsludge under various operational conditions in the Pilot Plant. Sixteen types of filamentous organisms were identified. The major filamentous organisms present in the Pilot Plant were Type 1701, Type 0041, Sphaerotilus natans, Microthrix parvicella, and Nocardia sp. Nocardia sp. was quite dominant in the early stages of the experimental period during high ambient temperatures (summer), indicating that temperature is one determining factor in the distribution of Nocardia sp. Thiothrix sp. was very sensitive to the dissolved oxygen (DO) level, with low DO values favoring the growth of the organisms. Microbiological observations made during the start-up and stable operation of the full-scale secondary treatment plant (maximum capacity 780 MGD) are also reported. No dominant filamentous species existed during the start-up period. Type 0803 and Type 1701, indicators of low oxygen level for the applied food to microorganism ratio, confirmed the low DO conditions of activated sludge tanks.
鹿岛污水处理厂（DITP）处理生活污水和工业废水，其峰值流量可达每日12.7亿加仑（MGD）（3342立方米/分钟）。DITP设有一个中试厂，由两条相同的纯氧活性污泥处理流程组成，每条流程的最大处理能力为1 MGD（2.63立方米/分钟），以模拟全尺寸设施的最大流量。本研究记录了中试厂在各种运行条件下活性污泥中丝状微生物群落。共鉴定出16种丝状微生物。中试厂中存在的主要丝状微生物有1701型、0041型、浮游球衣菌、细小微丝菌和诺卡氏菌属。在实验期初期的高温（夏季）环境下，诺卡氏菌属相当占优势，这表明温度是诺卡氏菌属分布的一个决定因素。硫丝菌属对溶解氧（DO）水平非常敏感，低溶解氧值有利于该菌生长。还报告了全尺寸二级处理厂（最大处理能力780 MGD）启动和稳定运行期间的微生物观察结果。启动期间不存在优势丝状菌。对于所应用的食物与微生物比例而言，0803型和1701型是低氧水平的指标，证实了活性污泥池的低溶解氧状况。
