Mechanism of strengthened deep nitrogen and phosphorus removal from sewage based on physicochemical and biochemical coupling process
LI Desheng1,2,, PENG Shuai1, LIU Jingyi1, DENG Shihai1, LIU Yuanhui1, REN Ke1, LIU Linghua3 1.School of Civil and Architectural Engineering, Beijing Jiaotong University, Beijing 100044, China 2.Beijing Key Laboratory of Typical Pollutant Control and Water Quality Protection, Beijing Jiaotong University, Beijing 100044, China 3.China Institute of Water Resources and Hydropower Research, Beijing 100044, China
Abstract:Currently, the conventional wastewater treatment plants have faced many problems such as incomplete nitrification and denitrification with conventional wastewater treatment technologies, high ammonia nitrogen, total nitrogen and total phosphorus concentrations in the effluent, and high operational cost. In this study, based on the physicochemical and biochemical coupling process, a chemical catalytic bio-coupled filter (CCBF) was constructed to treat the drainage from the wastewater treatment plant. The removal efficiencies of ammonia nitrogen, total nitrogen, total phosphorus and COD in this drainage by CCBF were studied. The results showed at DO of 5.5~6.0 mg·L?1, HRT of 8 h, C/N ratio of 1.5∶1, CCBF could reduce ${\rm{NH}}_4^ + $-N from 48.5 mg·L?1 to 4.58 mg·L-1, TN from 51.2 mg·L?1 to 6.5 mg·L?1, TP from 6.6 mg·L?1 to 0.48 mg·L?1, and COD from 78.5 mg·L?1 to 33 mg·L-1, respectively, and their removal efficiencies corresponded to 89.5%, 85.7%, 92.5% and 57.9%, respectively. The above four indictors of CCBF effluent could meet the first-class A emission level of national pollutant discharge standard of urban sewage treatment plant (GB18918-2002). The nitrogen removal process in the CCBF system was simulated by Eckenfelder equation. Reaction orders of ${n_{{\rm{NH}}_4^ + {\text{-}} {\rm{N}}}} $=0.314 76 and nTN=0.282 21, reactor rate constants of ${K_{{\rm{NH}}_4^ + {\text{-}}{\rm{N}}}} $= 0.128 02 and KTN=0.218 59, were determined with correlation coefficients (R2) of 0.983 3 for the simulation on ${\rm{NH}}_4^{+} $-N removal. In comparison with the conventional biological treatment technology at hydraulic loading of 0.000 8~0.007 m3·(m2·min)?1, the CCBF process contained high content and active biomass, and obvious physicochemical and biochemical coupling effects occurred accordingly. Key words:sewage plant drainage/ physicochemical and biochemical coupling process/ advanced treatment/ nitrogen and phosphorus removal/ kinetic model.
图1实验装置示意图 Figure1.Schematic diagram of the experimental set-up
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Mechanism of strengthened deep nitrogen and phosphorus removal from sewage based on physicochemical and biochemical coupling process
LI Desheng1,2,, PENG Shuai1, LIU Jingyi1, DENG Shihai1, LIU Yuanhui1, REN Ke1, LIU Linghua3 1.School of Civil and Architectural Engineering, Beijing Jiaotong University, Beijing 100044, China 2.Beijing Key Laboratory of Typical Pollutant Control and Water Quality Protection, Beijing Jiaotong University, Beijing 100044, China 3.China Institute of Water Resources and Hydropower Research, Beijing 100044, China Received Date: 2018-12-11 Accepted Date: 2019-04-01 Available Online: 2019-10-11 Keywords:sewage plant drainage/ physicochemical and biochemical coupling process/ advanced treatment/ nitrogen and phosphorus removal/ kinetic model Abstract:Currently, the conventional wastewater treatment plants have faced many problems such as incomplete nitrification and denitrification with conventional wastewater treatment technologies, high ammonia nitrogen, total nitrogen and total phosphorus concentrations in the effluent, and high operational cost. In this study, based on the physicochemical and biochemical coupling process, a chemical catalytic bio-coupled filter (CCBF) was constructed to treat the drainage from the wastewater treatment plant. The removal efficiencies of ammonia nitrogen, total nitrogen, total phosphorus and COD in this drainage by CCBF were studied. The results showed at DO of 5.5~6.0 mg·L?1, HRT of 8 h, C/N ratio of 1.5∶1, CCBF could reduce ${\rm{NH}}_4^ + $-N from 48.5 mg·L?1 to 4.58 mg·L-1, TN from 51.2 mg·L?1 to 6.5 mg·L?1, TP from 6.6 mg·L?1 to 0.48 mg·L?1, and COD from 78.5 mg·L?1 to 33 mg·L-1, respectively, and their removal efficiencies corresponded to 89.5%, 85.7%, 92.5% and 57.9%, respectively. The above four indictors of CCBF effluent could meet the first-class A emission level of national pollutant discharge standard of urban sewage treatment plant (GB18918-2002). The nitrogen removal process in the CCBF system was simulated by Eckenfelder equation. Reaction orders of ${n_{{\rm{NH}}_4^ + {\text{-}} {\rm{N}}}} $=0.314 76 and nTN=0.282 21, reactor rate constants of ${K_{{\rm{NH}}_4^ + {\text{-}}{\rm{N}}}} $= 0.128 02 and KTN=0.218 59, were determined with correlation coefficients (R2) of 0.983 3 for the simulation on ${\rm{NH}}_4^{+} $-N removal. In comparison with the conventional biological treatment technology at hydraulic loading of 0.000 8~0.007 m3·(m2·min)?1, the CCBF process contained high content and active biomass, and obvious physicochemical and biochemical coupling effects occurred accordingly.
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