Process parameter optimization of integrated biofilm-magnetic separation device for polluted river water treatment
CHANG Qingyi1,2,3,, CHENG Xiaoying1,2,3,, 1.School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China 2.Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China 3.Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China
Abstract:The contaminated river water was treated by an integrated biofilm-magnetic separation device. In the biofilm reaction zone, the single-factor experiment was carried out while in the magnetic seperation reaction zone, the response method was carried out , which disclosed the effect of the key parameters of the integrated device on the treatment of polluted water, and determined the optimum process parameters. The results showed that in the biofilm reaction zone, the removal rates of NH4+-N, TN and CODMn were 90%, 60% and 90%, respectively, at the optimal conditions such as hydraulic retention time (HRT) of 12 h, the ratio of non-aeration time to aeration time of 6∶6, and the temperature of 28 ℃. In the magnetic separation reaction zone, TP removal rate from biofilm treated water reached 96.55% at the optimal conditions such as polyaluminum chloride (PAC) dosage of 133.02 mg·L?1, polyacrylamide (PAM) dosage of 2.96 mg·L?1, and magnetic seeding dosage of 171.66 mg·L?1, of which PAC dosage had a most significant effect on phosphorus removal. During the stable running of the integrated device, the removal rates of ${\rm{NH}}_4^{+} $-N, TN, CODMn and TP in effluent reached 91.78%, 61.25%, 93.85% and 97.12%, respectively. This study provided an important theoretical basis for nitrogen and phosphorus removal from polluted river water. Key words:polluted river water/ biofilm/ magnetic separation/ response surface method/ key parameters.
图1集成装置结构 Figure1.Structure of the integrated device
下载: 导出CSV 表3最优实验条件磁分离反应区对TP去除率 Table3.TP removal rate in the magnetic separation reaction zone under the optimal conditions
实验编号
A/(mg·L?1)
B/(mg·L?1)
C/(mg·L?1)
Y/%
1
133.02
2.96
171.66
96.03
2
133.02
2.96
171.66
97.14
3
133.02
2.96
171.66
96.48
实验编号
A/(mg·L?1)
B/(mg·L?1)
C/(mg·L?1)
Y/%
1
133.02
2.96
171.66
96.03
2
133.02
2.96
171.66
97.14
3
133.02
2.96
171.66
96.48
下载: 导出CSV 表4全过程运行集成装置的进出水中${\rm{NH}}_4^{+} $-N、TN、CODMn和TP的浓度 Table4.${\rm{NH}}_4^{+} $-N, TN, CODMn and TP concentration in influent and effluent of the integrated devices during the whole process running
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1.School of Environment and Civil Engineering, Jiangnan University, Wuxi 214122, China 2.Jiangsu Key Laboratory of Anaerobic Biotechnology, Wuxi 214122, China 3.Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou 215009, China Received Date: 2018-12-09 Accepted Date: 2019-03-08 Available Online: 2019-09-17 Keywords:polluted river water/ biofilm/ magnetic separation/ response surface method/ key parameters Abstract:The contaminated river water was treated by an integrated biofilm-magnetic separation device. In the biofilm reaction zone, the single-factor experiment was carried out while in the magnetic seperation reaction zone, the response method was carried out , which disclosed the effect of the key parameters of the integrated device on the treatment of polluted water, and determined the optimum process parameters. The results showed that in the biofilm reaction zone, the removal rates of NH4+-N, TN and CODMn were 90%, 60% and 90%, respectively, at the optimal conditions such as hydraulic retention time (HRT) of 12 h, the ratio of non-aeration time to aeration time of 6∶6, and the temperature of 28 ℃. In the magnetic separation reaction zone, TP removal rate from biofilm treated water reached 96.55% at the optimal conditions such as polyaluminum chloride (PAC) dosage of 133.02 mg·L?1, polyacrylamide (PAM) dosage of 2.96 mg·L?1, and magnetic seeding dosage of 171.66 mg·L?1, of which PAC dosage had a most significant effect on phosphorus removal. During the stable running of the integrated device, the removal rates of ${\rm{NH}}_4^{+} $-N, TN, CODMn and TP in effluent reached 91.78%, 61.25%, 93.85% and 97.12%, respectively. This study provided an important theoretical basis for nitrogen and phosphorus removal from polluted river water.
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