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Effect of heavy metals in recycled water used for household laundry on quality of cloth and washing machine

机译：家用洗衣用水中重金属对布料和洗衣机质量的影响

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摘要

Recycled water for washing clothes saves significant amount of potable water and hence has a great potential for sustainable urban-water management. To date, there has been no official acceptance and very rare practice of use of recycled water for household laundry. This study investigates the effects of critical heavy metals (Pb, Mn, Fe, Cu and Zn) on cloth quality and corrosive/scaling of washing machine to evaluate the feasibility of using recycled water for household laundry. The experimental data can be used for future recycled-water-quality guidelines. Five representative cloth materials namely polyester, satin, polycotton, denim and organic cotton were selected for washing in tap water and synthetic recycled water which contained different concentrations of heavy metals. Cloth durability, surface morphology and textile colour of washed cloth samples were measured to investigate the effects of heavy metals on quality of fabric. Langelier Saturation Index (LSI) was used as the indicator for predicting corrosive/scaling effects on washing machine. The results indicated that quality of fabrics after 50 wash cycles was found to have no change by recycled water when concentration of Pb and Mn < 0.5 mg/L, Fe < 1 mg/L, Cu < 5 mg/L and Zn < 30 mg/L. Lower than the above values, the LSI indicated that recycled water would not lead to any negative impact on washing machine.
机译：用于洗衣服的循环水可节省大量饮用水，因此具有可持续城市用水管理的巨大潜力。迄今为止，还没有官方认可，很少使用循环水进行家庭洗衣。本研究调查了关键重金属（Pb，Mn，Fe，Cu和Zn）对衣物质量和洗衣机腐蚀/结垢的影响，以评估将再生水用于家庭洗衣的可行性。实验数据可用于将来的循环水水质准则。选择了五种代表性的布料，分别是聚酯，缎纹，涤棉，牛仔布和有机棉，以在自来水和合成循环水中洗涤，其中含有不同浓度的重金属。测量水洗布样品的布料耐久性，表面形态和纺织品颜色，以研究重金属对织物质量的影响。 Langelier饱和指数（LSI）用作预测洗衣机腐蚀/结垢影响的指标。结果表明，当Pb和Mn <0.5 mg / L，Fe <1 mg / L，Cu <5 mg / L和Zn <30 mg时，循环水对织物质量无影响。 /升低于上述值，LSI表示循环水不会对洗衣机产生任何负面影响。

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