{"id":38853,"date":"2025-09-22T14:30:32","date_gmt":"2025-09-22T06:30:32","guid":{"rendered":"https:\/\/stark-water.com\/?p=38853"},"modified":"2025-09-22T14:45:08","modified_gmt":"2025-09-22T06:45:08","slug":"di-water-system-industrial-design","status":"publish","type":"post","link":"https:\/\/stark-water.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/di-water-system-industrial-design\/","title":{"rendered":"\u5de5\u696d\u7528\u7d14\u6c34\u30b7\u30b9\u30c6\u30e0\uff1a\u8a2d\u8a08\u3001\u30b5\u30a4\u30b8\u30f3\u30b0\u3001\u6c34\u8cea\u76ee\u6a19"},"content":{"rendered":"

This engineering guide explains how to plan an industrial\u00a0\u30c0\u30a4\u30a6\u30a9\u30fc\u30bf\u30fc\u30b7\u30b9\u30c6\u30e0<\/strong>\u2014from RO pretreatment and\u00a0EDI vs mixed bed<\/strong>\u00a0choices to sizing tables, resistivity targets, polishing steps, instrumentation, and a bill-of-materials template. It is written for factories, laboratories, food & beverage plants, hotels, and surface-treatment shops that need reliable deionized water from wells or municipal supplies.
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\"Typical
Typical DI train: MMF\/AC \u2192 RO \u2192 EDI or mixed bed \u2192 UV \u2192 0.2 \u03bcm final filter \u2192 storage\/loop.\n<\/figcaption><\/figure>\n\n\n\n

1) What Is a DI Water System (vs RO & \u201cUltrapure\u201d)?<\/h2>\n\n\n\n

A \u30c0\u30a4\u30a6\u30a9\u30fc\u30bf\u30fc\u30b7\u30b9\u30c6\u30e0<\/strong> deionizes water by removing dissolved ions to reach a target resistivity or conductivity. RO (\u9006\u6d78\u900f<\/em>) is usually the primary desalting step; \u96fb\u6c17\u96fb\u96e2\uff08EDI\uff09<\/em> or a \u30df\u30c3\u30af\u30b9\u30d9\u30c3\u30c9<\/em> (SAC+SBA resins) then polishes the RO permeate to very low ionic levels. \u201cUltrapure\u201d is a use-case label (electronics\/analytical labs), not a single machine. Final requirements depend on your industry standard and validation plan.<\/p>\n\n\n\n

In practice: wells\/municipal feed \u2192 pretreatment (particulates, organics, hardness control) \u2192 RO<\/strong> \u2192 EDI\u307e\u305f\u306f\u6df7\u5408\u30d9\u30c3\u30c9<\/strong> \u2192 \u7d2b\u5916\u7dda<\/strong> (microbial\/TOC control) \u2192 0.2 \u03bcm<\/strong> final filter \u2192 storage and recirculating loop (if required).<\/p>\n\n\n\n

2) Quality Targets & Conversions (Resistivity \u2194 Conductivity)<\/h2>\n\n\n\n

Specify quality as \u62b5\u6297\u7387 (M\u03a9-cm)<\/strong> \u307e\u305f\u306f \u5c0e\u96fb\u7387 (\u03bcS\/cm)<\/strong>. The quick conversion is:<\/p>\n\n\n\n

\u5c0e\u96fb\u7387 (\u03bcS\/cm) = 1 \/ \u6bd4\u62b5\u6297 (M\u03a9-cm)<\/pre>\n\n\n\n
Examples: 18.2 M\u03a9\u00b7cm \u2248 0.055 \u03bcS\/cm; 1.0 M\u03a9\u00b7cm \u2248 1.0 \u03bcS\/cm; 0.2 M\u03a9\u00b7cm \u2248 5 \u03bcS\/cm.<\/small><\/p>\n\n\n\n
Application (typical)<\/th>Common target<\/th>\u5099\u8003<\/th><\/tr><\/thead>
General industrial rinse, boilers makeup (non-high-pressure)<\/td>0.1\u20131.0 M\u03a9\u00b7cm (10\u20131 \u03bcS\/cm)<\/td>RO + mixed bed often sufficient<\/td><\/tr>
Laboratory Type II\/III, many F&B utilities<\/td>\u2265 1\u201310 M\u03a9\u00b7cm (\u2264 1\u20130.1 \u03bcS\/cm)<\/td>RO + EDI or high-capacity mixed bed<\/td><\/tr>
Electronics\/analytical Type I<\/td>~18 M\u03a9\u00b7cm (~0.055 \u03bcS\/cm)<\/td>EDI + polishing loop; add TOC control<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Values above are engineering starting points<\/em>. Use your sector\u2019s standard (e.g., lab water types, corporate SOPs) for formal acceptance criteria.<\/small><\/p>\n\n\n\n
3) Di Water System Process Trains that Work in Industry<\/h2>\n\n\n\n
Storage & loop<\/strong>\u00a0\u2014 stainless steel tank with vent filter, spray ball and recirculation to maintain quality.<\/p>\n\n\n\n
\u524d\u51e6\u7406<\/strong>\u00a0\u2014 multimedia filtration (MMF) and\u00a0activated carbon<\/a>; add softening or antiscalant to protect RO; keep SDI low.<\/p>\n\n\n\n
RO desalting<\/strong>\u00a0\u2014 core TDS removal; choose element count\/staging for temperature, recovery, and fouling risk.<\/p>\n\n\n\n
EDI or Mixed Bed polishing<\/strong>\u00a0\u2014 see Section 4 for selection and sizing.<\/p>\n\n\n\n
UV (254 nm)<\/strong>\u00a0\u305d\u3057\u3066\u00a00.2 \u03bcm\u30d5\u30a1\u30a4\u30ca\u30eb\u30d5\u30a3\u30eb\u30bf\u30fc<\/strong>\u00a0\u2014 control microbes and particulates before points of use.<\/p>\n\n\n\n
\"Choose
Choose EDI for continuous polishing and low chemicals; choose mixed bed for wider tolerance and simple retrofits.\n<\/figcaption><\/figure>\n\n\n\n
4) Fast Sizing: RO, EDI or Mixed Bed<\/h2>\n\n\n\n
4.1 RO Sizing (early estimate)<\/h3>\n\n\n\n