Specifications include, but are not limited to: Crude glycerin will not be approved under any circumstances for use as a supplemental carbon source. The Town of Enfield is concerned about the impacts crude glycerin could have on existing tanks, pumps, piping and on the treatment process. Glycerin shall be considered crude if it is a byproduct of biodiesel production and it has any of the following attributes: a. It is not normally refined/processed to consistently meet the specification stated in the above. b. It has not been directly marketed as a supplemental carbon source for more than a year. c. It does not have more than one (1) year history being utilized as a supplemental carbon source in at least five (5) plants with more than 1 mgd flow. d. If product exceeds 74 % glycerin or 1,200,000 mg/L Chemical Oxygen Demand (COD)
