The challenge
The Thai Hoa factory in Thái Nguyên, Vietnam manufactures rubber gloves, which are used by a leading microelectronics company in Hanoi. Aiming to reduce the factory’s water footprint and to secure water supply in a sustainable way, water treatment specialist Vatech JSC delivered a robust solution for this project.
NX Filtration’s hollow-fiber nanofiltration (dNF) membranes demonstrate high retentions towards low molecular weight organic compounds, are operated as cross-flow and at low transmembrane pressures, resulted in low operational costs. Moreover, these membranes demonstrate low fouling behaviour, reducing the need for extensive pre-treatment and chemical consumption. Given previous projects where NX Filtration and Vatech succeeded in using dNF, the choice for this specific technology was made.
The solution
In this project, dNF80 membranes, with a 800 Dalton cut-off point, are applied in order to obtain complete removal of suspended solids, turbidity and high removal of COD.
Furthermore, the low scaling behaviour due to relatively high hardness passage was one of the main factors that contributed to the choice for the dNF hollow fiber nanofiltration technology.
After nanofiltration, the water is directed to the factory’s raw water tank for reuse. Operating at high fluxes, the system’s footprint is very compact, which makes for the perfect solution for decentralized wastewater treatment and reuse technology.
The results
The results demonstrate the superior performance of the membranes, which ensure that the product water meets the strict site’s requirements.
The dNF system is operated at the following conditions:
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