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Efficient water reuse for paper mill production with HFNF
HFNF pre-treatment ensures stable RO performance and reduces discharge under variable conditions
Efficient water reuse for paper mill production with HFNF
The Challenge
The customer aimed to upgrade its water treatment plant to minimize wastewater discharge and improve the efficiency of its existing water reuse
system based on reverse osmosis (RO). A key challenge was the fluctuating feed water quality from the existing wastewater treatment plant, with high levels of organic and inorganic matter affecting the performance of the RO system. NX Filtration’s Hollow Fiber Nanofiltration (HFNF) technology was applied to address these challenges.
The Solution
At the core of the process, HFNF (dNF80) performs the majority of the treatment, protecting the downstream RO system. The pre-treatment consists of a Dissolved Air Flotation (DAF) unit, followed by a 150-micron disk filter. The DAF stabilizes the wastewater by removing oils, greases, floating solids, and foam-forming surfactants, after which the disk filter provides final particulate protection. HFNF then removes the majority of COD and polishes suspended solids to near-zero levels, delivering a stable, high-quality permeate even under variable conditions. Its robust performance and ability to handle fluctuations significantly reduce the load on downstream processes. A downstream GAC unit buffers occasional COD spikes and limits biological growth, ensuring smooth and reliable RO operation.
The Results
The HFNF system demonstrated robust performance, achieving over 90% water recovery with daily membrane cleaning. By consistently delivering high-quality permeate and achieving up to 87% COD removal, HFNF significantly reduces the load on downstream GAC and RO units. This high removal efficiency results in fewer GAC replacements, more stable RO operation, and measurable reductions in discharge volumes and overall water footprint. Together, these results confirm HFNF as a key contributor to improving the efficiency and reliability of the entire water reuse system.
The customer aimed to upgrade its water treatment plant to minimize wastewater discharge and improve the efficiency of its existing water reuse
system based on reverse osmosis (RO). A key challenge was the fluctuating feed water quality from the existing wastewater treatment plant, with high levels of organic and inorganic matter affecting the performance of the RO system. NX Filtration’s Hollow Fiber Nanofiltration (HFNF) technology was applied to address these challenges.
The Solution
At the core of the process, HFNF (dNF80) performs the majority of the treatment, protecting the downstream RO system. The pre-treatment consists of a Dissolved Air Flotation (DAF) unit, followed by a 150-micron disk filter. The DAF stabilizes the wastewater by removing oils, greases, floating solids, and foam-forming surfactants, after which the disk filter provides final particulate protection. HFNF then removes the majority of COD and polishes suspended solids to near-zero levels, delivering a stable, high-quality permeate even under variable conditions. Its robust performance and ability to handle fluctuations significantly reduce the load on downstream processes. A downstream GAC unit buffers occasional COD spikes and limits biological growth, ensuring smooth and reliable RO operation.
The Results
The HFNF system demonstrated robust performance, achieving over 90% water recovery with daily membrane cleaning. By consistently delivering high-quality permeate and achieving up to 87% COD removal, HFNF significantly reduces the load on downstream GAC and RO units. This high removal efficiency results in fewer GAC replacements, more stable RO operation, and measurable reductions in discharge volumes and overall water footprint. Together, these results confirm HFNF as a key contributor to improving the efficiency and reliability of the entire water reuse system.
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