High loading of Biochemical Oxygen Demand (BOD) and Total Suspended Solids (TSS) in wastewater entering the JAMES Treatment Plant can adversely affect the treatment processes an can contribute to increased treatment plant expansion needs. To mitigate these effects, the Abbotsford/Mission Water and Sewer Commission Source Control Program (WSCSCP) monitors approximately twenty five businesses as part of the BOD and TSS Waste Program. Samples are collected on a regular basis and are submitted to an external laboratory for analysis.
The sampling program consists of 24-hour composite samples collected on a random schedule approximately four times per month. These samples are submitted to an accredited external laboratory for pH, BOD and TSS analysis. The analytical results and monthly sanitary sewer discharge volumes for each customer are used to determine BOD & TSS Waste fees as per the Sewer Rates and Regulations Bylaw. BOD & TSS Waste fees are compiled on a monthly basis and are invoiced on a quarterly basis. The current BOD & TSS Waste fees are shown below.
BOD & TSS Waste Fees:
| Biochemical Oxygen Demand (BOD) |
$0.39/kg/month |
| Total Suspended Solids (TSS) |
$0.41/kg/month |
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Example of the fee calculation for a monthly wastewater discharge of 3,000 m3 with an average BOD of 500 mg/L and an average TSS of 400 mg/L
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| BOD Fees: |
| 500 mg |
x |
1 g |
x |
1kg |
x |
1,000 L |
x |
3,000 m3 |
= |
1,500kg |
| L |
|
1,000 mg |
|
1,000 g |
|
1 m3 |
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| 1,500 kg |
X |
$0.39 |
= |
$585.00 |
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kg |
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| TSS Fees: |
| 400 mg |
x |
1g |
x |
1kg |
x |
1,000 L |
x |
3,000 m3 |
= |
1,200kg |
| L |
|
1,000 mg |
|
1,000 g |
|
1 m3 |
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| 1,200 kg |
x |
$0.41 |
= |
$492.00 |
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kg |
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| Total BOD & TSS Waste Fees: |
| $585.00 |
+ |
$492.00 |
= |
$1,077.00 |
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