Download Case Study (PDF)

Reduction of Total Biological Oxygen Demand (BOD) in Industrial
Waste Water using a Single Stage Solution

Major meat producer

Biological Oxygen DemandProject Background

A major US meat producer located in the Midwest generates high nutrient waste water from one of their production facilities. Water from rinsing activities contains soaps, oil/grease, and sugars making it difficult to remove soluble compounds that contribute to high BOD. The plant needed a wastewater treatment process that would treat 10,000 gallons per day to less than 300 mg/L BOD.

Project Results

The contaminants in the rinse water that contribute to high BOD readings are both insoluble and soluble in water. Ultrafiltration filters are unable to remove the soluble BOD and fine polymeric filters are easily fouled by oil and grease. Membrane bioreactors were tested but did not meet the discharge target of less than 300 mg/L BOD. Cerahelix succeeded where other technologies failed by reducing both soluble and insoluble BOD in a single filtration step. Cerahelix removed >99% of TSS, which makes up the insoluble portion of BOD. The PicoHelix filter further reduces soluble BOD, such as dissolved sugars, soaps, and oils. A unique characteristic of the ceramic picofiltration is the ability of the ionic layer to act as a secondary layer that extends the rejection range of soluble BOD, thereby improving rejection in high nutrient rinse water where polymer filters or ceramic UF filters foul. The PicoHelix demonstrated the removal of soluble particles as small as simple sugars, resulting in meeting the discharge requirement of < 300 mg/L .

removal of soluble particles

System Parameters
Cerahelix filterPicoHelix
Wastewater flow10,000 GPD
Influent C3000OD range261—11899 ppm
Hydraulic Recovery77%
(mg/ L)
BOD282-1180106 +/- 33
COD964-5220299 +/- 80
Oil/Grease92- 2800-5 +/- 5