冷却塔
反渗透
废水
超滤(肾)
环境科学
重新使用
流出物
结垢
环境工程
水处理
再生水
反渗透装置
污水处理
微咸水
缺水
废物管理
制浆造纸工业
饮用水净化
膜污染
膜
水冷
水资源
化学
工程类
生态学
盐度
生物
机械工程
生物化学
色谱法
作者
Muhammad Saeed Ullah,Muhammad Umar Mushtaq,Mohd Adil,Khairuddin Sanaullah,Rashail Ashas,Rabia Sabir
摘要
Abstract Global indicators have warned of freshwater scarcity in Asia. However, the utilization of freshwater resources has skyrocketed for commercial and industrial purposes without any strategy for recycling and reuse. The power plant's wastewater/reject mainly consisted of cooling tower blowdown water and reverse osmosis (RO) plant reject water. Due to the high turbid nature of reject water, pretreatment was carried out to achieve SDI15 <3 by employing multimedia filters (MMF), activated carbon filters (ACF) and ultrafiltration (UF). Operational parameters of RO membranes were optimized (11.5 bar, 29 °C) to achieve maximum water recovery along with higher rejection rates of critical scale forming species such as 81% total dissolved solids (TDS), 73% calcium hardness and 72% silica (Si). After accounting for backwash water and other concentrate rejections, the membrane treatment plant has achieved an appreciable recovery rate of more than 44%. The RO membrane-treated water was then incorporated in the cooling tower and a 16% reduction in freshwater makeup was achieved. Reduction of microbial growth rate as well as corrosion and scaling in the cooling tower was observed due to the reuse of treated water. This is to confirm here that brackish water RO membranes can act as a strong contender for reject water reclamation and effective utilization.
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