Feedforward control for nitrogen removal in a pilot-scale anaerobic-anoxic-oxic plant for municipal wastewater treatment

doi:10.1007/s11783-010-0266-2

Front Envir Sci Eng Chin

2011, Vol. 5

Issue (1) : 130-139 https://doi.org/10.1007/s11783-010-0266-2

RESEARCH ARTICLE

Feedforward control for nitrogen removal in a pilot-scale anaerobic-anoxic-oxic plant for municipal wastewater treatment

Tonggang SHEN, Hanchang SHI(

), Huiming SHI, He JING, Huilei XIONG

Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China

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Abstract

To improve the efficiency of nitrogen removal with lower energy consumption, the study of feedforward control was carried out on a pilot-scale anaerobic-anoxic-oxic (AAO) plant for the treatment of municipal wastewater. The effluent qualities of the pilot plant under different control strategies were investigated. The results indicated that the change of external recycle was not a suitable approach to regulate the sludge concentration of plug-flow reactors; adjusting the aeration valve and dissolved oxygen set-point according to ammonia load could overcome the impact of influent fluctuation; and the denitrification potential could be estimated based on the transit time of anoxic zone and the relative content of carbon resource entering the anoxic zone. Simple feedforward control strategies for aeration and internal recycle were subsequently proposed and validated. The nitrogen removal was successfully improved in the pilot plant. The effluent total nitrogen had decreased by 29.9% and was steadily controlled below 15 mg·L^-1. Furthermore, approximately 38% of the energy for aeration had been saved.

Keywords anaerobic-anoxic-oxic (AAO) feedforward control municipal wastewater nitrogen removal

Corresponding Author(s): SHI Hanchang,Email:hanchang@tsinghua.edu.cn

Issue Date: 05 March 2011

Cite this article:

Tonggang SHEN,Huiming SHI,He JING, et al. Feedforward control for nitrogen removal in a pilot-scale anaerobic-anoxic-oxic plant for municipal wastewater treatment[J]. Front Envir Sci Eng Chin, 2011, 5(1): 130-139.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-010-0266-2
https://academic.hep.com.cn/fese/EN/Y2011/V5/I1/130

Fig.1 Schematic diagram of the pilot-plant (Ana: anaerobic tank; Ano: anoxi tank; O: oxic tank)

Tab.1 Characteristics of the primary clarifier effluent

Fig.2 MLSS varying in the first anaerobic tank (Ana1) after the shutting down of external recycle

Fig.3 MLSS varying in the ninth oxic tank (O9) after the regulating of

Fig.4 Aeration control during Stage I. (a) Effects of VOD adjusting; (b) ammonia concentration in the ninth oxic tank (O9)

Fig.5 Effect of DO set-point control on ammonia removal in the ninth oxic tank (O9) in stage II

Tab.2 Aeration control rules

Fig.6 Aeration and effluent ammonia concentration of the pilot-plant in stage III

Fig.7 Concentrations of NH-N and filtered TN in different sampling points of E-line and R-line in stage III

Fig.8 Effect of estimated anoxic C/N on estimating the anoxic denitrification potential

Tab.3 Internal recycle control rules

Fig.9 Anoxic denitrification efficiency of R-line and E-line in stage III

Fig.10 Effluent nutrient of stage III. (a) Comparison between the R-line and E-line; (b) hourly fluctuation of effluent TN, E-line

Tab.4 Summary of the pilot-plant performance

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