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AkzoNobel ensures compliant wastewater discharge with HFNF in France
HFNF as a polishing step for Organics and Solids removal compliance
AkzoNobel ensures compliant wastewater discharge with HFNF in France
The Challenge
A paint manufacturing facility faced a critical compliance hurdle where its treated wastewater with fluctuating quality, exceeded municipal sewer discharge limits of COD, BOD5 and TSS even after passing through a dissolved air flotation (DAF) unit. This posed a risk of non-compliance with local permits potentially leading to environmental penalties and operational constraints. A robust treatment step was needed to consistently reduce the levels of these parameters – while maintaining a high water recovery and operational efficiency.
The Solution
NX Filtration’s HFNF technology provided an ideal solution to the customer needs by evaluating real wastewater fluctuations,
fouling tendencies and cleaning needs. A feed and bleed configuration was chosen to operate at 94 % recovery with a low flux of 12 LMH with a crossflow velocity of 0.8 m/s. This arrangement helped to mitigate fouling along with optimized hydraulic (every 20 mins) and maintenance cleaning (every 3 hours) steps, showcasing the strength of our technology to meet customer requirements on challenging wastewaters.
The Results
Despite variability in feedwater quality, the HFNF system demonstrated a stable operation at 94 % recovery
producing consistent permeate quality meeting all local discharge limits. The system was operated at a lower flux to effectively mitigate organic fouling while keeping cleaning strategies to a minimum. The system showed excellent rejection of color and organics while maintaining a permeability of 4.5 LMH/bar. COD, BOD5, TSS levels were below regulatory discharge limits which proves the efficacy and robustness of NX Filtration’s HFNF technology to meet stringent regulations and customer satisfaction.
A paint manufacturing facility faced a critical compliance hurdle where its treated wastewater with fluctuating quality, exceeded municipal sewer discharge limits of COD, BOD5 and TSS even after passing through a dissolved air flotation (DAF) unit. This posed a risk of non-compliance with local permits potentially leading to environmental penalties and operational constraints. A robust treatment step was needed to consistently reduce the levels of these parameters – while maintaining a high water recovery and operational efficiency.
The Solution
NX Filtration’s HFNF technology provided an ideal solution to the customer needs by evaluating real wastewater fluctuations,
fouling tendencies and cleaning needs. A feed and bleed configuration was chosen to operate at 94 % recovery with a low flux of 12 LMH with a crossflow velocity of 0.8 m/s. This arrangement helped to mitigate fouling along with optimized hydraulic (every 20 mins) and maintenance cleaning (every 3 hours) steps, showcasing the strength of our technology to meet customer requirements on challenging wastewaters.
The Results
Despite variability in feedwater quality, the HFNF system demonstrated a stable operation at 94 % recovery
producing consistent permeate quality meeting all local discharge limits. The system was operated at a lower flux to effectively mitigate organic fouling while keeping cleaning strategies to a minimum. The system showed excellent rejection of color and organics while maintaining a permeability of 4.5 LMH/bar. COD, BOD5, TSS levels were below regulatory discharge limits which proves the efficacy and robustness of NX Filtration’s HFNF technology to meet stringent regulations and customer satisfaction.
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Reference project - Akzo Nobel, France
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