WANGSi-qi,WANGWei-min,ZHANGTao,et al.Pilot Study on the Performance of Nanofiltration Membranes for Treating Surface Water with High Hardness and Alkalinity in Northern Jiangsu[J].China Water & Wastewater,2024,40(19):25-30.
应对苏北地区高硬度高碱度地表水的纳滤膜性能中试
- Title:
- Pilot Study on the Performance of Nanofiltration Membranes for Treating Surface Water with High Hardness and Alkalinity in Northern Jiangsu
- 摘要:
- 为探究超滤-纳滤组合工艺对苏北地区某地表水源的净化效果，开展了纳滤膜性能中试研究，明确了水厂对纳滤膜的基本性能需求，探究了几款不同商品纳滤膜的性能差异。在水温为30 ℃左右、膜通量为20 L/（m2·h）和回收率为30%的条件下，致密型纳滤膜N2的运行压力（0.33 MPa）比疏松型纳滤膜N1高出近1倍，但其脱盐率（95%）明显高于N1（40%），且对硬度和碱度的去除效果更优。为解决烧水结垢问题，该水厂应采用致密型纳滤膜；当纳滤膜对硬度和碱度的去除率分别达到90%和80%以上时，可满足超滤和纳滤产水1∶1勾兑后煮沸不结垢的需求。多款纳滤膜的平行测试表明，E膜对有机物、硬度和碱度的去除效果与N2膜接近，但运行压力较N2膜更低，在应对高硬度、高碱度水质时优势明显。
- Abstract:
- In order to explore the water treatment efficiency of ultrafiltration-nanofiltration combined process in a water treatment plant in northern Jiangsu, a pilot study was carried out on the performance of nanofiltration membranes. The basic performance requirements of nanofiltration membranes were determined, and the performance differences of several different commercial nanofiltration membranes were explored. The results showed that the operating pressure (0.33 MPa) of the dense nanofiltration membrane (N2) was nearly double that of the loose nanofiltration membrane (N1) at temperature of about 30 ℃, the flux of 20 L/（m2·h） and the recovery rate of 30%, but the desalination rate of the N2 membrane (95%) was significantly higher than that of N1 (40%), along with better removal effects for hardness and alkalinity. In order to solve the scaling problem of boiling water, the water plant should adopt the dense nanofiltration membrane. When the removal rate of hardness and alkalinity of the nanofiltration membrane reaches more than 90% and 80% respectively, the equally blended produced water from ultrafiltration and nanofiltration could prevent scaling during boiling. Parallel tests of a variety of nanofiltration membranes showed that the removal effect of E membrane for organic matter, hardness and alkalinity was similar to that of N2 membrane, along with a lower operating pressure, which has obvious advantages in treating water with high hardness and high alkalinity.
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