Time-Series Characteristics of Influent Water Quality of WWTPs in Main Urban Areas of Nanjing
The daily monitoring data of influent water quality of seven wastewater treatment plants(WWTPs)in the main urban area of Nanjing from 2019 to 2021 were taken as the study object,and the time-series characteristics of pollutant concentration were analyzed systematically.The fluctuation period of water quality were identified by using the empirical mode decomposition,and the trends of water quality were diagnosed with seasonal and trend decomposition,and Mann-Kendall test.The main results were as follows.(1)The average concentrations of ammonia nitrogen,TN,TP and CODCr from the influent of WWTP in the main urban area were 24.74,29.47,3.08 mg/L and 214.85 mg/L,respectively.(2)The concentration of influent pollutants showed significant seasonal differences,with lower concentration in July and higher concentration in December.(3)CODCr of influent water from WWTPs in the main urban area had the strong upward trend,and the CODCr of four WWTPs presented the significant upward trends.(4)On the daily scale,the ammonia nitrogen,TN,TP and CODCr of influent water from each WWTP exhibited periodic oscillation with 3 days.The relevant results provide important data support for improving the operation efficiency of wastewater treatment in the study area.
Nanjingwastewater treatment plantinfluent water qualitytime-series characteristicstrendperiodic
万方数据
维普
