Online control of biofilm and reducing carbon dosage in denitrifying biofilter： pilot and full-scale application
Online control of biofilm and reducing carbon dosage in denitrifying biofilter： pilot and full-scale application作者机构：School of Environment & Natural Resources Renmin University of China Beijing 100872 China Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology Beijing 100124 China
出 版 物：《Frontiers of Environmental Science & Engineering》 (环境科学与工程前沿（英文）)
年 卷 期：2017年第11卷第1期
页 面：59-66页
核心收录：
学科分类：08[工学] 0815[工学-水利工程] 0835[工学-软件工程] 0802[工学-机械工程] 080201[工学-机械制造及其自动化]
主 题：Reclaimed water treatment Denitrifying biofilter Carbon dosage Backwash control
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%.
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