SOUR_Spreadsheet_20131024

Specific Oxygen Uptake Rate Test for Biological Residuals Treatment
North Carolina Administrative Code 15A NCAC 02T .1107 requires biological residuals applied to the land to meet one of the listed vector attraction reduction requirements. The Code of
Federal Regulation, Title 40, Part 503 requires one of the vector attraction requirements listed in 503 to be met. The Specific Oxygen Uptake Rate Test is one of the listed requirements
in 02T and 503.
EPA document "Environmental Regulations and Technology: Control of Pathogens and Vector Attraction in Sewage Sludge" provides guidance for the Specific Oxygen Uptake Rate Test.
Standard Method 2710 B should be followed with one exception. The total solids concentration instead of the volatile suspended solids concentration is used in the calculation of the
specific oxygen uptake rate (SOUR).
A SOUR of 1.5 mg oxygen/hour/gram total solids or less at 20 degrees centigrade indicates that an aerobically digested sludge has been adequately reduced in vector attraction.
For information see "Specific Oxygen Uptake Rate Testing Compliance" letter at; http://portal.ncdenr.org/web/wq/aps/lau/reporting
Fill in sampling information in the blue boxes at the top of the spreadsheet and record the measured dissolved oxygen level at one minute intervals in blue boxes on left. The percent
total solids must be 2% or less, the temperature range must be between 10 and 30 degrees Celsius, and the dissolved oxygen level must be 2 mg/L or above.

Time
(minutes)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Instructions: Enter Data in the Blue Boxes. The Calculation and the Spreadsheet execute automatically.
Updated 10/23/2013
Facility Name:
Biosolids Permit Number:
Date:
Digester Temperature:
Sampling Date/Time:
Sampled By:
Analysis Date/Time:
Analyzed By:
Total Solids:
Beginning Temperature:
End Temperature:
Dissolved Oxygen Level
(mg/l)
Slope:
Intercept:
Correlation Coefficient:
Oxygen Uptake Rate:
Ambient Specific Oxygen Uptake Rate:
Average Temperature:
Temperature Correction Factor:
Temperature Corrected Specific Oxygen Uptake Rate:
% Dry Solids
degrees Celsius
degrees Celsius

mg Oxygen/hr
mg Oxygen/hr/g
degrees Celsius
mg Oxygen/hr/g