Abstract:Aiming at the characteristics of high fluctuations of water quality and quantity of rural domestic sewage, the integrated equipment based on Engelbart SST process was used to treat it, and the treatment performance and operational energy consumption of the integrated equipment under the condition of water quality fluctuation were investigated. The results showed that the average removal rates of COD, NH3-N, TN, and TP could reach 95.3%, 94.9%, 78.9% and 92.2% by this integrated equipment in conjunction with chemical phosphorus removal, respectively, under the operational conditions of DO=0.3~0.5 mg·L?1, reflux ratio=1 000%~2 000%, HRT=12~15 h and MLSS=5 600~8 800 mg·L?1. This equipment presented a good anti-fluctuation capability, when the fluctuation ranges of COD, NH3-N or TN loading around the design values were ?39.7%~171.0%, ?34.8%~96.9% or ?45.0%~61.1%, the water quality of its effluent could still meet the design requirements, COD, NH3-N and TN in effluent were equal to or below 50, 5.0 and 15 mg·L?1 respectively. The equipment operated under the economic DO conditions with the automatic control system of aeration, and the energy consumption was 0.24~0.33 kWh·m?3. This study can provide reference for the selection and operation of rural domestic sewage treatment technology. Key words:rural domestic sewage/ integrated equipment for sewage treatment/ DO control/ water quality fluctuation/ Engelbart.
图1应用工程工艺流程 Figure1.Process flow diagram of project
LIU J, LU Z B, ZHANG J, et al. Phylogenetic characterization of microbial communities in a full-scale vermifilter treating rural domestic sewage[J]. Ecological Engineering, 2013, 61: 100-109. doi: 10.1016/j.ecoleng.2013.09.015
ELISABETH V, PAUL L. Simultaneous nitrification and denitrification in bench-scale sequencing batch reactors[J]. Water Research, 1996, 30(2): 277-284. doi: 10.1016/0043-1354(95)00174-3
RIKKE L M, RAYMOND J Z, VALERIO G, et al. Challenges for simultaneous nitrification, denitrification and phosphorus removal in microbial aggregates: Mass transfer limitation and nitrous oxide production[J]. FEMS Microbiology Ecology, 2005, 52(3): 329-338. doi: 10.1016/j.femsec.2004.11.011
1.Scimee Sci. & Tech. Co. Ltd., Chengdu 610045, China 2.Beijing Guohuan Tsinghua Environmental Engineering Design & Research Institute Co. Ltd., Beijing 100084, China Received Date: 2020-01-15 Accepted Date: 2020-06-17 Available Online: 2020-09-05 Keywords:rural domestic sewage/ integrated equipment for sewage treatment/ DO control/ water quality fluctuation/ Engelbart Abstract:Aiming at the characteristics of high fluctuations of water quality and quantity of rural domestic sewage, the integrated equipment based on Engelbart SST process was used to treat it, and the treatment performance and operational energy consumption of the integrated equipment under the condition of water quality fluctuation were investigated. The results showed that the average removal rates of COD, NH3-N, TN, and TP could reach 95.3%, 94.9%, 78.9% and 92.2% by this integrated equipment in conjunction with chemical phosphorus removal, respectively, under the operational conditions of DO=0.3~0.5 mg·L?1, reflux ratio=1 000%~2 000%, HRT=12~15 h and MLSS=5 600~8 800 mg·L?1. This equipment presented a good anti-fluctuation capability, when the fluctuation ranges of COD, NH3-N or TN loading around the design values were ?39.7%~171.0%, ?34.8%~96.9% or ?45.0%~61.1%, the water quality of its effluent could still meet the design requirements, COD, NH3-N and TN in effluent were equal to or below 50, 5.0 and 15 mg·L?1 respectively. The equipment operated under the economic DO conditions with the automatic control system of aeration, and the energy consumption was 0.24~0.33 kWh·m?3. This study can provide reference for the selection and operation of rural domestic sewage treatment technology.