title: Simultaneous carbon and nutrient removal in an airlift loop reactor under a limited filamentous bulking state.
abstract: Airlift loop reactors (ALRs) are important bioreactors for wastewater treatment. However, few studies have investigated the application of an ALR for simultaneous carbon and nutrient removal, especially for activated sludge systems. This study evaluated the performance of integrated nitrogen, phosphorus and COD removal in an ALR with a low height-to-diameter ratio in a limited filamentous bulking (LFB) state (SVI of 180-220mL/g). The average removal efficiencies for COD, NH(4)(+)-N, TN and TP were 91%, 92%, 86% and 94%, respectively. Additional research showed that only under the LFB state, the appropriate distribution of dissolved oxygen inside the ALR was established to promote a well-balanced aerobic and anoxic/anaerobic state. In addition, the macro-gradient of the substrate concentration at the inlet and the heavier bio-P sludge density compensated for the proliferation of filaments. Hence, the stable LFB state was achieved by balancing the floc-forming bacteria and the filamentous bacteria in the ALR.
authors: Key Laboratory of Yangtze Water Environment of Ministry of Education, State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China.
authors: Ming
authors: M
authors: Jiang
authors: Yalei
authors: Y
authors: Zhang
authors: Xuefei
authors: X
authors: Zhou
authors: Yimin
authors: Y
authors: Su
authors: Min
authors: M
authors: Zhang
authors: Ke
authors: K
authors: Zhang
mesh_terms: D000332:Aerobiosis; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000378:metabolism; D018508:Water Purification
chemical_list: D002244:Carbon