General Mills

Dynatec provides reuse project for cereal manufacturer

undefinedFood Plant MBR SytemHigh quality discharge and reuse from MBR

Dynatec Provides Reuse Water for Cereals Plant

Dynatec Systems, Inc. has installed a water reuse system in a major cereals plant in Georgia.

The complete treatment system, consisting of a membrane bioreactor (MBR), followed by reverse osmosis (RO), provides a net savings to the plant of more than $3,000 per day in water and sewer charges after deduction of the plant operating costs. The water is reused for cleaning, in scrubbers and in boilers.

Previously, the facility discharged all of the wastewater to a municipal treatment plant at a rate of up to 0.5 mgd, and paid both volume and load charges

Quality Criteria

Since the plant produces a food product, ultimate water quality is vital. The two-stage membrane system (MBR + RO) and final sterilization with ultraviolet (UV) treatment provides the quality assurance that plant management requires. In addition, the membranes used in the MBR system are external to the aeration basin, and are tubular. This type of membrane is much less susceptible to failure than the immersed type.

System Design

After a review of the available treatment options, the owners of the facility settled on the Dynatec HiRate™ Bioreactor option. This process combines aerated biological treatment with an out-of-basin ultrafiltration (UF) system. In combination with reverse osmosis treatment, Dynatec was able to provide the client with the necessary assurances that the water quality would not be compromised, and that the water would be suitable for process purposes, such as boiler feed water.

Dynatec’s design consisted of the following components:

  • Internally-fed rotary screen
  • 500,000 gallon above-ground stainless steel equalization tank with jet aeration and duplex PD blowers
  • 500,000 gallon above-ground stainless steel aerated biological reactor with jet aeration and triplex PD blowers
  • Four membrane skids with a common automated CIP (clean-in-place) system, one skid operates in standby mode
  • Reverse Osmosis system
  • Final UV (ultraviolet) sterilization
  • Sludge dewatering decanter centrifuge
  • Completely integrated control system managing all system functions


Document downloads

Cereals Plant Reuse(1).pdf
Cereals Plant Reuse(1).pdf
pdf (1,274.59kb)