摘要
Denitrifying biofilter （DNBF） is widely used for advanced nitrogen removal in the reclaimed wastewater treatment plants （RWWTPs）. Manual control of DNBF easily led to unstable process performance and high cost. Consequently, there is a need to automatic control of two decisive operational processes, carbon dosage and backwash, in DNBF. In this study, online control of DNBF was investigated in the pilot-scale DNBF （600 m3·d-1） and then applied in the full-scale DNBF （ 10 ×10^4m^3·d-1）. A novel simple onhne control strategy for carbon dosage with the effluent mtrate as the sole control parameter was designed and tested in the pilot-scale DNBF. Backwash operation was optimized based on the backwash control strategy using turbidity as control parameter. Using the integrated control strategy, in the pilot-scale DNBF, highly efficient nitrate removal with effluent TN lower than 3 mg·L-1 was achieved and DNBF was not clogged any more. The online control strategy for carbon dosage was successfully applied in a RWWTE Using the online control strategy, the effluent nitrate concentration was controlled relatively stable and carbon dosage was saved for 18%.
Denitrifying biofilter （DNBF） is widely used for advanced nitrogen removal in the reclaimed wastewater treatment plants （RWWTPs）. Manual control of DNBF easily led to unstable process performance and high cost. Consequently, there is a need to automatic control of two decisive operational processes, carbon dosage and backwash, in DNBF. In this study, online control of DNBF was investigated in the pilot-scale DNBF （600 m3·d-1） and then applied in the full-scale DNBF （ 10 ×10^4m^3·d-1）. A novel simple onhne control strategy for carbon dosage with the effluent mtrate as the sole control parameter was designed and tested in the pilot-scale DNBF. Backwash operation was optimized based on the backwash control strategy using turbidity as control parameter. Using the integrated control strategy, in the pilot-scale DNBF, highly efficient nitrate removal with effluent TN lower than 3 mg·L-1 was achieved and DNBF was not clogged any more. The online control strategy for carbon dosage was successfully applied in a RWWTE Using the online control strategy, the effluent nitrate concentration was controlled relatively stable and carbon dosage was saved for 18%.
基金
Acknowledgements This research was supported by the National Natural Science Foundation of China （Grant No. 51508561）. Xiuhong Liu also acknowledges China Postdoctoral Science Foundation （No. 2015M581236） for the financial support.
