Peculiarity
Insufficient nitrogen and phosphorus nutrients, with low utilization efficiency from conventional nutrient dosing.
Fluctuations in water quality caused by changes in product types and papermaking chemicals.
Pulping wastewater contains lignin and aromatic compounds, leading to deep colour and a low BOD/COD ratio (B/C).
Q&A.
Insufficient nitrogen and phosphorus in the biological treatment system.
Changes in recycled paper feedstock lead to increased organic nitrogen or ammonia nitrogen in influent, affecting nitrogen discharge compliance.
Changes in papermaking chemicals increases COD and organic nitrogen in wastewater, resulting in high COD, ammonia nitrogen, and total nitrogen concentrations in effluent.
Poor sludge settling performance, and filamentous and non-filamentous bacterial bulking.
Solution
