Formaldehyde molecules are ...
Published by Gerd Teunissen, technical director at INTERAGUA, Lda.
Formaldehyde molecules are relatively small and well biologically treatable. But it helps if you can seed from an existing WWTP with similar wastewater composition. Control of pH and temperature (!) are important. We have done two plants from natural resin industry with very high COD inlet (15 - 20.000 mg/l) and outlet below 100 mg/l COD. Sludge settling for final clarification can be a problem, with small flocs when the temperature is too high (> 30 ºC), but can be solved.