Case Studies – Page 2 – Wexco Environmental, MN

Major Freeway Truck Stop

Issue: A truck stop is changing ownership, and the existing onsite sewage treatment system is noncompliant. The truck stop includes a full-service restaurant, convenience store and shower facilities. A major chain submarine shop will also be added. The onsite system includes 26,000 gallons in treatment tank capacity, a recirculating gravel filter and 16 septic mounds…

Chicken Egg Processing Plant

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Issue: A chicken egg-processing plant is experiencing malodor from a 800,000-gallon lagoon in its wastewater treatment facility. BOD in this lagoon is 2,600 mg/L. Flow into the lagoon is about 35,000 GPD, and the system operator estimated influent BOD of 1,500 mg/L. Action: Install 2 MBD-12 aerators. Odor improves; results are less than expected. New…

Pig Nursery Lagoon Odor Reduction

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I Issue: A 17,000-head pig nursery is experiencing odor problems in a 16 million gallon manure lagoon. System loading is 2,890 lbs. BOD/day. Lagoon BOD is 12,100 mg/L Lagoon HPC (Heterotrophic Plate Count) is 750,000 cfu/ml Lagoon TKN is 1,080 mg/L Lagoon TSS is 6,180 mg/L Malodor is high Action: Install six 2 HP MBD…

Energy Savings

Before: Lagoon with 7 surface aerators totaling 28 HP. After: Identical capacity lagoon with 4 MBD (Micro Bubble Diffusion) aerators totaling 8 HP.

Winter Performance

Before: Other surface aerator – frozen conditions limit oxygen transfer.. After: Same facility, different lagoon. Open area of water with higher oxygen transfer with MBD (Micro Bubble Diffusion) in winter.

Sludge Reduction

Issue: An Iowa wastewater treatment facility has a three-pond lagoon system that receives 300,000 GPD influent. Sludge levels are 26″ – 32″ in cell one and sludge removal is required. In 2001, the estimated expense to waste the lagoons and make the associated equipment repairs was approximately $300,000. Action: Four 2-HP Micro Bubble Diffuser…

Shoreline Restoration

Issue: A lakeshore owner on Big Sandy Lake near McGregor, MN has a steep sandy shoreline with severe erosion problems. A large portion of the sandy shoreline has eroded away, causing the existing vegetation and trees to fall in the lake. Action: A shoreline stabilization project is designed by the local Soil and Water Conservation…

Bacterial Treatment

Issue: A Fortune 500 company has regular waste strength exceedances at one of its food processing facilities. Action: The high levels are traced to a grease trap. Treatment with bacterial additive produces four consecutive quarters of compliance and is now included as standard procedure.

Four Star Restaurant

Overview: A Four Star restaurant has a nearly new septic system headed for premature failure due to excessive influent waste strength. They also struggle with odor problems. Solution: Additional grease trap capacity and VBT aeration are installed ahead of the existing recirculating gravel filter. Odor issues are resolved immediately and compliance limits are met. …

Dinner Restaurant

Overview: A northern Wisconsin dinner restaurant has a failed septic system. Another contractor proposes a treatment technology to handle their high strength discharge that makes the project unaffordable. Solution: VBT aeration is installed at approximately ¼ the cost of the previously proposed technology and effluent compliance limits are met. …