Recycling Treated Municipal Wastewater for Industrial Water Use

Craddock Consulting Engineers 1
In Association with CDM & James Crook
TM4-Appendix A_0707.doc
Appendix A Data Analysis Methods
Database Used: MPCA Discharge Monitoring Reports (2003-2005; 2005 focus)
Filenames (as received from MPCA): Water Quality Data
(http://www.pca.state.mn.us/data/edaWater/index.cfm)
Date data received from MPCA: April 19, 2006
Analysis Approach
Step 1: Import the original MPCA water quality data (in text file format) into
Microsoft Access.
Step 2: Create queries in the Access database to extract annual maximum,
minimum, and average value of the calendar month average water quality data in
2005 for each municipal wastewater treatment facility, discharging to a water
body, in Minnesota. Water quality parameters evaluated include CBOD5, TSS,
NH3, P, and fecal coliform.
Step 3: Display average values of effluent quality spatially for the state. This
required linking the 2005 water quality data generated from the MS Access query
analysis to the shapefile for the wastewater treatment facilities (WWTPs).
Step 4: Generate maps and graphics to characterize average effluent quality of
Minnesota’s municipal WWTPs.
• Evaluate the variability of effluent quality through general statistics
and percentile plots for each water quality parameter.
• Determine appropriate ranges to characterize each constituent.
• Create GIS maps that show WWTPs and range of effluent quality.
• Generate bar charts and pie charts to summarize the number of
WWTPs and permitted capacity based on the effluent quality
ranges.