Abstract
This study combined the IA craft, and the goal is to achieve aerobic, anoxic and even anaerobic alternating cycles in the same reactor to enhance biological nitrogen and phosphorus removal. At present, there are many studies on the IA process, but less research on the IAMBBR craft. The IAMBBR craft combines intermittent aeration with a biofilm process, which can further improve the processing capacity of a continuous-flow biofilm reactor. Therefore, it is necessary to conduct a detailed study of the IAMBBR craft. In addition, the exposure time ratio is an important parameter for the operation of the IA craft. By adjusting the exposure time ratio, the DO concentration in the reactor can be controlled, which affects the operation effect of the reactor. Therefore, this chapter mainly explores the effect of exposure time ratio on the operating effect of IAMBBR. Six operating stages were connected: the ratio of CA and exposure time are 3h/3h, 1h/1h, 30min/30min, 15min/15min, and 5min/5min, respectively, to study the removal effect of pollutants.
Highlights
In recent years, with the increasingly strict discharge standards for municipal wastewater treatment plant, a large number of municipal wastewater treatment plants are in urgent need of upgrading [1, 2]
How to improve nitrogen and phosphorus removal efficiency and reduce energy consumption in municipal wastewater treatment plants is a hot spot in wastewater treatment field
Moving bed biofilm reactor (MBBR) has the same structure as the activated sludge process, and it has the characteristics of lower cost, shorter time-consuming during the upgradation [4]
Summary
With the increasingly strict discharge standards for municipal wastewater treatment plant, a large number of municipal wastewater treatment plants are in urgent need of upgrading [1, 2]. How to improve nitrogen and phosphorus removal efficiency and reduce energy consumption in municipal wastewater treatment plants is a hot spot in wastewater treatment field. Moving bed biofilm reactor (MBBR) has the same structure as the activated sludge process, and it has the characteristics of lower cost, shorter time-consuming during the upgradation [4]. MBBR process can improve the treatment load and effluent water quality after upgrading, and lower the operating cost [5]. The combination of MBBR technology and intermittent aeration (IA) technology can improve the nitrogen and phosphorus removal efficiency, and promote the energy saving and consumption reduction of the sewage treatment plant. Singh et al [6] used a biofilm / activated sludge mixing process to study the effect of exposure time ratio on pollutant removal under high aeration. The denitrification effect in IA was slightly higher than that in CA
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