Nitrification Wastewater Treatment Plant Design: CE 432/532 Lab Project, Lab Reports of Civil Engineering

Download Nitrification Wastewater Treatment Plant Design: CE 432/532 Lab Project and more Lab Reports Civil Engineering in PDF only on Docsity! CE 432/532 Design Problem Nitrification Wastewater Treatment Plant Design Due: October 17, 2008 Utilizing the MathCAD Activated Sludge design worksheet provided on our course web site, add nitrification capabilities. This worksheet is set up to analyze 4 CSTRs in series. The worksheet is a mass balance-based analysis of an activated sludge treatment system; the worksheet is already complete for organic carbon removal. You have previously been provided a schematic diagram. Once you have set up your worksheet, analyze treatment efficiency over an SRT range of 2-25 days and develop the following plots: • SRT vs effluent sCOD • SRT vs effluent NH3-N • SRT vs average MLVSS • SRT vs average heterotrophic biomass • SRT vs average autotrophic biomass • SRT vs total oxygen demand • For SRTs of 10, and 25 days, plot (both SRTs on the same plot) o sCOD per basin o NH3-N per basin o MLVSS per basin o Oxygen demand per basin Complete the above analyses for the following reactor operational configurations: CAS, Step Feed, Contact Stabilization. Finally, recommend an operational scheme for the influent and effluent criteria below. Defend your recommendation, including specifying minimum operational criteria. Maximum Monthly Flow = 0.716 mgd Average Dry Weather Flow = 0.372 mgd NPDES Effluent Limitations Parameter Average Monthly BOD5 and TSS 30 mg/L, 113 lbs/day 85% removal of influent concentrations NH3-N 2.0 mg/L, 14 lb/day (Nov-Mar) 1.0 mg/L, 3.7 lb/day (Apr-Oct) Influent Wastewater Characteristics Parameter Influent Concentration (mg/L) Average Influent Mass Load (lb/day) Maximum Influent Mass Load (lb/day) Per Capita, Average (lb/person/day) Per Capita, Range (lb/person/day) BOD5 110 355 575 0.123 0.07 – 0.20 NH3-N 13.7 -- -- -- -- TSS 132 410 719 0.143 0.08 – 0.25 D:\My Documents\ERC Academics\CE 432\Lab Problems\2008\Tertiary-N WWTP Design.doc