Float Glass production is a very clean manufacturing process. The wastewater released from Xinyi will not contain any toxic materials, and will comply with all of Stratford’s wastewater requirements for direct discharge to the municipal sanitary system and sewage treatment plant.
A tiny amount of fumaric acid in powder form is applied as interleaving medium to the surface of float glass. It is widely and commonly used to protect the glass surface from scratches and moisture during transportation and storage.
Fumaric acid has been addressed in Section 5.5 of Functional Servicing and Stormwater Management Report, prepared by WalterFedy:
“Based on the process operation, and its usage in the production line, only 96 m3/day of wastewater discharge will contain trace quantity of Fumaric Acid, at a concentration of less than 5 ppm (parts per million).”
For general information, Fumaric acid is an organic acid widely found in nature, and it is commonly used as food additive.
According to the Canadian Government website – a List of Permitted Food Additives with Other Accepted Uses, the permissible level of Dioctyl Sodium Sulfosuccinate (Fumaric Acid) in finished drinks is 10 ppm. Xinyi’s use of Fumaric acid is diluted to 50% less than consumed beverages.