Statistical Analysis of Water Quantity and Quality of a WWTP under the Influence of Epidemic in Changsha City
In order to ensure the safe operation of urban wastewater treatment plant(WWTP)and discharge standard,the data for the influent water quantity and influent and effluent water quality of a WWTP in Changsha in the past six years were selected for statistical analysis in this study.The results showed that,the daily average water inflow of the WWTP in 2020 was lower than that of 2018 to March 2023,mainly due to the containment measures taken by the COVID-19 at the beginning of 2020.Influent water quality of 2020 was affected by both the epidemic situation and rainfall.Except for 2022,the influent BOD5,CODCr and SS concentrations in 2020 were declined substantially compared to other years,while the concentrations of ammonia nitrogen,TN and TP were relatively small.The lower influent BOD5 and SS in 2022 compared to other years might be due to the relatively severe epidemic and dry weather,as well as the anaerobic hydrolysis of pollutants deposited in the pipeline.Based on the initial data of the epidemic in 2020,the influent concentration fluctuated remarkably,which was relatively higher in winter,and lower in the end of January to the end of February and summer.The measured effluent quality reached the designed effluent quality standard,with the highest removal rate of SS and the lowest removal rate of TN,and that modified sequencing batch reactor(MSBR)could remove the majority of TN and ammonia nitrogen.The average values of influent BOD5/CODCr,BOD5/TN and BOD5/TP were 0.58,4.95 and 46.34 respectively,and a brief sharp change occurred from the end of January to the end of February due to the impact of the epidemic.But the overall biodegradability of influent was good,and the carbon source was sufficient,so biological phosphorus removal process could be employed.When the carbon source was insufficient,chemical phosphorus removal could be considered to ensure that the effluent quality met the standard.The results can provide reference for the design and operation of similar WWTPs.
wastewater treatment plant(WWTP)water quantity and quality changestatistical analysisCOVID-19Changsha City
国家科技期刊平台
NSTL
万方数据
