Bio-augmentation to rapid realize partial nitrification of real sewage.
The feasibility of bio-augmentation processes in promoting start-up of partial nitrification of sewage was investigated in this study. Initially, partial nitrification was well-established in an anoxic/oxic reactor treating high-strength ammonia wastewater. Then the influent was replaced by real sewage instantly or gradually. In both cases, nitrite pathway could be maintained for 5-7d. However, it was eventually destroyed due to the inevitable over-aeration. In another strategy, sewage was treated in the adsorption/biodegradation reactor. The nitrite pathway was obviously promoted by addition of the previous activated sludge from high ammonia wastewater treatment. Nitrite accumulation efficiency of sewage was quickly increased from 26% to 86% and maintained at a high level for 2 months. Moreover, the effluent has a favorable ratio of NH(4)(+)/NO(2)(-) for feeding anammox process. The experimental results indicated that appropriate bio-augmentation strategies could significantly improve the build-up partial nitrification of sewage in the pretreatment of anammox.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. zhangliang_1986@126.com
Liang
L
Zhang
Shujun
S
Zhang
Yiping
Y
Gan
Yongzhen
Y
Peng
D000641:Ammonia / Q000378:metabolism; D019149:Bioreactors; D005240:Feasibility Studies; D058465:Nitrification; D012722:Sewage; D013997:Time Factors
D012722:Sewage; D000641:Ammonia