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/

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- days and develop the following plots:

• SRT vs effluent sCOD
• SRT vs effluent NH 3 -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 NH 3 -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 BOD 5 and TSS 30 mg/L, 113 lbs/day 85% removal of influent concentrations NH 3 -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)

BOD 5 110 355 575 0.123 0.07 – 0. NH 3 -N 13.7 -- -- -- -- TSS 132 410 719 0.143 0.08 – 0.

D:\My Documents\ERC Academics\CE 432\Lab Problems\2008\Tertiary-N WWTP Design.doc

D:\My Documents\ERC Academics\CE 432\Lab Problems\2008\Tertiary-N WWTP Design.doc

Submittal Requirements Prepare a brief (not to exceed 3 pages, single spaced, excluding plots) technical memorandum that summarizes your findings and recommendations. I strongly recommend you utilize tables to summarize key design elements. Your submittal should also include your design calculations (e.g., one copy of your MathCAD worksheet). You should write this memo as if you were writing to your client to submit this design report; do not write this memo as if you were simply preparing it for class. A general organizational outline would be as follows:

Introduction, Purpose, and Objectives

• Identify the purpose of the project. This should be one clear, general sentence that broadly describes to the reader the ‘big picture’.
• Identify the project objectives; these should be listed as bullets. You should have a lead- in sentence to the effect of “The objectives of this project were to accomplish the following:” Project Description Design Analyses (maybe include sub-categories for each process) Recommendations and Conclusions