A candy production facility faced a persistent wastewater challenge. Every day, approximately 20 tons of wash water, residual syrup, and cleaning water were discharged from the production workshops. The wastewater exhibited high and stable color that resisted biological degradation. In addition, its high sugar content and elevated organic load frequently shocked the existing biological treatment system, causing unstable performance and compliance risks.
Conventional treatment using PAC/PAM coagulation combined with alkali successfully removed some suspended solids and colloids, but the intense color remained. The facility needed a solution that could remove color efficiently before the biological stage, thereby reducing stress on microorganisms and ensuring consistent effluent quality.
The client provided wastewater samples for decolorizer selection testing. After evaluating several chemical decolorizing agents, the team selected a high-performance decolorizer for industrial wastewater specifically designed for sugar-rich, high-color streams. The experimental procedure was straightforward: the decolorizer was added directly to the raw wastewater at optimized dosage, followed by gentle mixing and brief settling.
The results were remarkable. Color removal for candy production workshops wastewater reached 95%, far exceeding what biological treatment alone could achieve. The decolorizer rapidly destabilized and aggregated color‑causing organic compounds, which then settled as compact flocs. Moreover, the chemical decolorizing agent also reduced a significant portion of the chemical oxygen demand (COD) by co‑precipitating organic molecules.
Three key advantages emerged:
l Rapid Decolorization – The decolorizer achieved 95% color removal in minutes, turning dark, syrup‑laden water into a nearly clear effluent.
l Reduced Biological Load – By removing color and part of the organic load upstream, the bioreactor experienced less shock, and microorganisms performed more reliably.
l High Compatibility – The decolorizer could be added directly before the bioreactor without any modification to the existing process or equipment.
This case demonstrates that targeted chemical decolorization is a practical, high‑efficiency solution for candy production wastewater. It not only solves the aesthetic problem of persistent color but also protects biological treatment systems from organic overload, helping facilities meet discharge standards consistently.
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