A Novel Method to Determine Blower Capacity of Wastewater Treatment Plantsfor Dry and Wet Weather Conditions

Journal of Water and Environment Technology

Xuan Hai Nguyen¹  Hidenari Yasui²  Mitsuharu Terashima²  Viet Hoang Nguyen²  Van Tuan Le³  Thi Ha Nguyen⁴  Hidenori Harada⁵  Viet Anh Nguyen⁶ 

[1] Department of Environment Impact Assessment Appraisal,Vietnam Environment Administration, Hanoi, Vietnam ;Faculty of Environmental Engineering, the University ofKitakyushu, Kitakyushu, Japan ;Faculty of Environmental Science, University ofSciences - Hue University, Hue, Vietnam ;Faculty of Environmental Science, Vietnam NationalUniversity - University of Science, Hanoi, Vietnam ;Graduate School of Asian and African Area Studies,Kyoto University, Kyoto, Japan ;Institute of Environmental Science and Engineering,Hanoi University of Civil Engineering, Hanoi, Vietnam ;

关键词: activated sludge model;    blower capacity;    dynamic parameter estimation;    extreme value distribution;    statistical analysis;   

DOI  :  10.2965/jwet.20-138

来源: DOAJ

【 摘 要 】

Ascertaining peak oxygen demand is crucial for plant designers to determine blowercapacities of wastewater treatment plants in planning phase. To obtain this technicalinformation without cumbersome influent sampling and analysis, a set of field-testactivated sludge reactors equipped with DO and nitrate-N sensors was installed at 3 sitesand continuously operated for a couple of months in each field. Under the controlledaeration and hydraulics of the reactors, the hourly influent oxygen demands wereback-calculated as biodegradable constituents using the IWA-Activated Sludge Model #1. Thedaily maximum concentrations (rounded to last for 1-hour) of biodegradable organics andnitrogen were ranged between 45~258 mg-COD/L and 10.4~32.3 mg-N/L in Site #1; 119~244mg-COD/L and 28.3~38.7 mg-N/L in Site #2; 194~552 mg-COD/L and 30.2~51.7 mg-N/L in Site #3respectively. The marginal blower capacities to maintain at least 1.0 mg-O2/Lof DO in the daily maximum oxygen demand were estimated based on the datasets using thestatistical method, Extreme Value Distribution analysis. To maintain the DO concentrationfor 99 days out of 100 days of the plant operations, the blower capacity was supposed tobe designed as high as 1.4~2.2 times than those of the blower calculated from the dailyaverage concentration.

【 授权许可】

Unknown