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反渗透膜清洗技术

反渗透膜清洗技术. Tight Spacing. 粗糙表面 Rough Surface. 界面层的盐浓度 Salt Concentration in the Boundary Layer. Velocity: V in > V out Salt Concentration : TDS in < TDS out. 污垢 FOULING. 低质量渗透水 Poor Permeate Quality. 低的产水量 Low Water Production. 膜损 Membrane Damage. 经常 / 频繁的清洗 Frequent Cleaning.

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反渗透膜清洗技术

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  1. 反渗透膜清洗技术

  2. Tight Spacing

  3. 粗糙表面 Rough Surface

  4. 界面层的盐浓度 Salt Concentration in the Boundary Layer Velocity: Vin > Vout Salt Concentration : TDSin < TDSout

  5. 污垢FOULING 低质量渗透水 Poor Permeate Quality 低的产水量 Low WaterProduction 膜损 Membrane Damage 经常/频繁的清洗 Frequent Cleaning

  6. 生物 污垢Biofouling 有机物 Organic Matter 离子氧化物和氢氧化物 Iron Oxides and Hydroxides Calcium Carbonate Sulfate and 和无机盐 Inorganic Salts 胶质铁和无水硅酸Colloidal Iron and Silica 常见污垢位置 Principle Fouling Location

  7. 预示污垢的因素 Fouling Indicators

  8. 膜保存 Membrane Preservation • 超过24小时，就需要保存 Preserve if out of service >24 hrs • 选择方案 Options: • 亚硫酸氢钠 Sodium Bisulfite 1% • Isothiazolone - PermaClean PC-56 • Isothiazolone - PermaClean PC-55 • 甲醛 Formaldehyde – carcinogen • 苯乙哌啶酮 – 膜损 Gluteraldehyde - membrane damage

  9. 膜 冲 洗Membrane Flushing • 如果系统停车，渗透水冲洗 Permeate flush if system shuts down • 作为一种“mini清洁” Acts as a “mini clean” • 减少污垢和水锈 Reduces fouling and scaling

  10. 清洁 Cleaning • RO需要清洁的需要 • RO’s need to be Cleaned! • Typically: • SDI 3 -5 每年清4次 Cleaning 4 /year • SDI 1- 3 每年清2次 Cleaning 2 /year • SDI < 1 每年清1次 Cleaning 1 /year

  11. When do I clean? • When any ONE of the following changes: • Differential Pressure by 15% • NPF by 15% • Salt Passage by 15% • Exceeding these limits may be irreparable • Start planning your strategy at the 1st indication of a minimum change!

  12. 等及久清洁降低RO性能Waiting too long to clean reduces RO performance Cleaning after > 15% decline 正确的清洁维护 Proper Cleaning Maintenance 在10-15%下降后 清洁优化RO性能 Cleaning after a 10-15% decline maximizes RO performance Normalized Permeate Flowrate Cleaning after 10-15% decline Time 不正确的清洁维护 Improper Cleaning Maintenance Normalized Permeate Flowrate Time

  13. 影响清洗的因素Factors effecting Cleaning • 装置设计 Plant Design • 装置运行 Plant Operation • 膜 Membrane • 化学药品 Chemicals

  14. 影响清洗的因素Factors effecting Cleaning • Temperature • pH • Flow vs. Soak • Time • Velocity

  15. 清洗指点 Cleaning Tips • 压降 <60 PSI Pressure drop < 60 PSI • 各压力容器(8”)的水流 35-40GPM • Flow 35- 40 GPM per pressure vessel (8”) • 清洗溶剂量：每个8”元件使用 8-10加仑，各压力容器 = 50加仑 • Cleaning Solution Volume: Use 8 - 10 Gallons Per 8” element. Each pressure vessel = 50 gallons volume • 如果观察有污垢，先使用碱洗 • Use Alkaline cleaners first if organic fouling is suspected

  16. 清洗指点 Cleaning Tips • 最高溶剂温度 • Max Solution Temperature per Manufacturer • 浸透膜 Soak Membranes • “逐步”/ “一段一段”清洗 clean “stage by stage” • 更换混浊的/黑的溶剂 • Replace Turbid / Murky Solutions • 保持良好的记录 Keep good records • 不要惊慌 Don’t Panic

  17. 保持良好记录 Keep Good Records Found on PermaCare Training CD

  18. 渗透水Permeate 浓盐水Concentrate Brine P 压力容器Pressure Vessels 2:1 清洗塔Cleaning Tank P P LL 加热器 Heater 进水Feed 滤筒Cartridge Filter 清洗Skid Cleaning Skid

  19. 膜剖析 Membrane Autopsy • 对使用过的膜做观察分析测试 - 破坏过程 • Destructive procedure consisting of observations and analytical tests on used membrane • 用以确认性能差或性能失效的原因 • Used to determine cause of failure or poor performance • 用以制定现场清洗的特定惯例的计划 • Used to develop site specific custom cleaning program

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