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RO reverse osmosis membrane element BW-4021/4040/8040 | For brackish water use, desalination rate 99.61% TP13T

Product Information

Surface water and groundwater desalination, greywater reuse, and water for electronic and power processes. RO reverse osmosis membrane element BW-4021/4040/8040 | For brackish water use, desalination rate 99.61% TP13T

Desalination rate 99.61% TP13T

BW 系列的定位：適用範圍最廣的常規型

沁森 Keensen BW 系列為常規型苦鹹水反滲透膜元件，適用於含鹽量 5000 mg/L 以內的地表水、地下水與中水脫鹽處理。原廠列出的應用領域涵蓋電子、電力、鋼鐵、製藥、熱電、石化與煤化工等產業。

 

官方標示的主要優勢為高脫鹽率、高穩定性、高經濟性與適用性廣。在多數工業純水應用中，若原水條件不特殊，BW 系列是成本效益最佳的標準選擇。

 

五個型號的取捨

BW 系列共五個型號，選型時有三個考量點：

  • size——8040 用於大型工業與市政系統，4040 用於中小型系統，4021 適合小型或空間受限的場合
  • 脫鹽率——BW-8040-2 的 99.70% 為系列最高，適合對出水品質要求最嚴的製程
  • Water production——BW-8040HF 的膜面積達 440 ft²、日產水量 13000 GPD，但脫鹽率為 99.50%

值得注意的是脫鹽率與產水量是取捨關係：BW-8040HF 的產水量比 BW-8040 高出約 24%，脫鹽率則低 0.1 個百分點。若系統重視產水量、對出水導電度的要求不到極致，HF 型可用較少的膜元件數量達成相同水量。

更換膜元件時，只要尺寸相同即可直接替換，不需更動壓力容器與管路配置。

 

進水條件決定膜的壽命

膜元件的實際壽命，取決於進水水質是否維持在規範內。BW 系列的關鍵限制包括：最大進水 SDI₁₅ 為 5.0、最大餘氯濃度 0.1 mg/L、最高進水溫度 45°C.

 

其中餘氯最需要注意。芳香聚醯胺膜對氧化劑敏感，餘氯超標造成的是不可逆的氧化損傷——無法藉由清洗恢復，只能更換膜元件。若原水為自來水或前段曾以次氯酸鈉殺菌，必須確實除氯後才能進膜。

 

連續運行的 pH 範圍為 2–11，化學清洗時可放寬至 1–13。單支膜元件的最大允許壓降為 15 psi——當壓差接近此值，代表汙堵已相當嚴重，應安排清洗而非繼續運轉。

 

如何在沁森膜元件產品線中選型

沁森的膜元件依原水含鹽量分為數個系列，BW 涵蓋 5000 mg/L 以內的常規範圍。若您的條件不同：

  • 含鹽量 1000 mg/L 以內、重視能耗 → XLP 節能型（100 psi 低壓運轉）
  • 水源易汙堵、需頻繁清洗 → FR 抗污染型（34 mil 寬流道，適用 8000 mg/L 以內）
  • 含鹽量 10000 mg/L 以上、海水淡化 → SW 高脫鹽型（耐壓 1200 psi）
  • 含鹽量 1000 mg/L 以內的家用或小型直飲水裝置 → 家用型 RO 膜元件

實際選型需依原水分析、系統回收率與產水量需求綜合判斷。若您手上有水質報告，歡迎提供給瑞順技術人員協助評估。

脫鹽率 99.6%技術講解

8 吋膜元件

型號 有效膜面積 ft²(m²) 日產水量 GPD(m³/d) 穩定脫鹽率(%)
BW-8040-2 400(37.2) 10500(39.7) 99.70
BW-8040 400(37.2) 10500(39.7) 99.60
BW-8040HF 440(40.9) 13000(49.2) 99.50

4 吋膜元件

型號 有效膜面積 ft²(m²) 日產水量 GPD(m³/d) 穩定脫鹽率(%)
BW-4040 85(7.9) 2500(9.5) 99.60
BW-4021 36(3.4) 1000(3.8) 99.60

標準測試條件

project 條件
測試用原水 2000 mg/L NaCl
測試壓力 225 psi(1.55 MPa)
water temperature 25°C
pH 值 7.5–8.0
Recovery rate 15%

size

Specification length 直徑 中心管內徑 中心管伸出長度
8040 40 in(1016 mm) 7.9 in(201 mm) 1.12 in(28.5 mm) —
4040 40 in(1016 mm) 3.9 in(99 mm) 0.75 in(19.1 mm) 1.04 in(26.5 mm)

操作極限

project 數值
最高操作壓力 600 psi(4.14 MPa)
最高進水溫度 45°C
最大進水流量 17.0 m³/h（8040）／3.6 m³/h（4040）
最大進水 SDI₁₅ 5.0
最大餘氯濃度 0.1 mg/L
連續運行時進水 pH 範圍 2–11
化學清洗時進水 pH 範圍 1–13
單支膜元件最大允許壓降 15 psi(0.1 MPa)

脫鹽率 99.6% 尺寸圖

8040：長 1016 mm × 直徑 201 mm｜4040：長 1016 mm × 直徑 99 mm

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