The influences of roasting activation on the particle morphology, microscopic structure, and adsorption properties of natural clinoptilolites were investigated. The experimental results show that the optimal modified ...The influences of roasting activation on the particle morphology, microscopic structure, and adsorption properties of natural clinoptilolites were investigated. The experimental results show that the optimal modified conditions include a calcination temperature at 400 ℃, a roasting time of 0.5 h, and furnace cooling. The ammonia nitrogen removal rate from analog renewable water of the modified clinoptilolites reached 72% in the optimized conditions, which is 12% higher than that of natural ones. Scanning electron microscopy analysis showed that the surface morphology changed, the micro-hole size increased, and the surface became smoother and more uniform after calcination. The single-point total adsorption average pore width increased from 7.74 nm to 10.64 nm.展开更多
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. Co...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%.展开更多
基金Funded by the National Natural Science Foundation of China(No.51174017)
文摘The influences of roasting activation on the particle morphology, microscopic structure, and adsorption properties of natural clinoptilolites were investigated. The experimental results show that the optimal modified conditions include a calcination temperature at 400 ℃, a roasting time of 0.5 h, and furnace cooling. The ammonia nitrogen removal rate from analog renewable water of the modified clinoptilolites reached 72% in the optimized conditions, which is 12% higher than that of natural ones. Scanning electron microscopy analysis showed that the surface morphology changed, the micro-hole size increased, and the surface became smoother and more uniform after calcination. The single-point total adsorption average pore width increased from 7.74 nm to 10.64 nm.
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.
文摘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%.
