方法
物質収支およびフラックス計算は回収率に基づく標準形式（Qp = Qf・Y）に従い、正味推進圧力は供給圧力から濃縮水側損失および供給水浸透圧を差し引いて算出します。
塩透過率はエレメントのベンチ試験基準条件に対して温度・フラックスで正規化され、実際の膜壁塩透過率を推定するために濃度分極係数が適用されます。
ATLAS WTS · Process Engineering
RO Membrane Performance Calculator
Reverse osmosis mass-balance, temperature correction, and salt-passage performance for single- or two-pass, up-to-3-stage concentrate-staged array configurations, with membrane-aging projection and product-water blending.
Project Information
Pass 1 — Feed Water & Process Conditions
Pass 1 — Pressure & Membrane Configuration
2- and 3-stage arrays feed each stage from the prior stage's concentrate, raising overall system recovery beyond what a single stage can reach.
Pass 1 — Stage 1
ΔP guidance: ~0.2–0.3 bar (~3–4 psi) friction loss per element in series, ≈1.2–2.4 bar for a standard 6–8-element vessel — independent of how many vessels feed this stage in parallel.
Pass 1 — Stage 2
ΔP guidance: ~0.2–0.3 bar/element in series, ≈1.2–2.4 bar for a standard 6–8-element vessel.
Re-pressurizes Stage 1's concentrate before it enters Stage 2, independent of the main feed pump — useful when this stage would otherwise run short on net driving pressure, especially at high recovery or aged-membrane conditions.
Pass 1 — Stage 3 Optional
ΔP guidance: ~0.2–0.3 bar/element in series, ≈1.2–2.4 bar for a standard 6–8-element vessel.
Re-pressurizes Stage 2's concentrate before it enters Stage 3, independent of the main feed pump.
Pass 1 — Membrane Aging Projection
Defaults follow the selected feed water type; edit for a specific project. The "Aged" condition (toggle top-right) projects permeate TDS and required feed pressure at end of the stated membrane age — the design should stay within spec at BOTH Day-1 and Aged conditions.
Second Pass
Pass 2's feed is Pass 1's blended permeate, re-pressurized by an interstage pump (modeled as Pass 2's own feed pressure). Common for high-purity applications (boiler feed, semiconductor, pharma) and RO+EDI trains.
Pass 2 — Feed & Membrane Configuration
Pass 2 feed is Pass 1's permeate (very low TDS), so this selects the 2nd-pass membrane's own bench baseline and aging defaults, not a feed-water fouling classification.
Fully independent of Pass 1's feed pressure — Pass 1's permeate arrives at Pass 2 already at atmospheric pressure (net of its own permeate back-pressure, effectively an atmospheric break tank), so this is the total pressure Pass 2's own booster pump must supply, not an addition on top of any Pass 1 residual.
Pass 2 — Stage 1
ΔP guidance: ~0.2–0.3 bar/element in series, ≈1.2–2.4 bar for a standard 6–8-element vessel.
Pass 2 — Stage 2
ΔP guidance: ~0.2–0.3 bar/element in series, ≈1.2–2.4 bar for a standard 6–8-element vessel.
Pass 2 — Membrane Aging Projection
Pass 2 Concentrate Recycle
Pass 2's final concentrate is already near permeate quality (it started from Pass 1 permeate), so recycling it into the raw feed instead of wasting it is standard practice and materially improves overall system recovery.
Product Water Blending
Optional raw/pretreated water blended directly into the final product stream to hit a target finished TDS without over-designing rejection. Leave flow at 0 to disable.
Overall System
Final Product Flow
—m³/h
Final Product TDS
—ppm
Overall System Recovery
—%
of raw feed, net of recycle boost
Waste (To Drain)
—m³/h
Pass 1 Performance
System Recovery
—%
Total Permeate Flow
—m³/h
Final Concentrate Flow
—m³/h
Blended Permeate TDS
—ppm
Final Concentrate TDS
—ppm
Overall Rejection
—%
Total Membrane Area
—m²
System Average Flux
—LMH
Pass 1 — Stage-by-Stage Breakdown
| Stage | Elements | Recovery | NDP | Osmotic P. | Flux | Rejection | Perm. Flow | Conc. Flow | Conc. TDS |
|---|
Pass 2 Performance
Pass 2 Recovery
—%
Pass 2 Permeate Flow
—m³/h
Pass 2 Concentrate TDS
—ppm
Pass 2 Permeate TDS
—ppm
Pass 2 Membrane Area
—m²
Pass 2 Average Flux
—LMH
| Stage | Elements | Recovery | NDP | Osmotic P. | Flux | Rejection | Perm. Flow | Conc. Flow | Conc. TDS |
|---|
Technical Warnings
No warnings — all parameters within the modeled envelope.
Inputs changed — click Calculate to refresh results above.
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このエンジニアリングツールは現在、英語版のみ提供しています。
01
エンジニアリングの根拠
規格 / 参照根拠
範囲 / 制限事項
- プロセスの予備評価用です。検証済み設計ソフトウェアや有資格プロセスエンジニアの審査に代わるものではありません。
02
エンジニアリングパス
用途
- 再利用・淡水化・ZLD 回収、濃縮、ゼロ液体排出の設計ロジック。
シナリオ
- 海水淡水化と濃縮塩水管理 エネルギー回収と濃縮塩水の有効活用による持続可能な海水淡水化。
- 汎用プロセス・ゼロ液体排出 ハイブリッド熱・膜システムによる全水回収と廃棄物最小化。
ワークフロー
- 海水淡水化 取水・前処理から、必要に応じた薬注、UF/MF、RO、コンディショニング、消毒、製品水までをつなぐ膜中心の淡水化フローです。 段階 05 — Reverse Osmosisこの段階へ戻る 05段階 08 — Product & Concentrate Boundaryこの段階へ戻る 08
- 高純度水 原水前処理、RO、ポリッシング、イオン交換またはCEDI、最終品質管理、供給ループまでをつなぐ高純度水の経路です。 段階 02 — Reverse Osmosisこの段階へ戻る 02
- 冷却水 補給水の特性把握、コンディショニング、冷却系の収支、ブロー、再利用または放流までをつなぐシステム経路です。 段階 04 — Blowdownこの段階へ戻る 04