Industrial reverse osmosis separates a feedwater stream into permeate and concentrate through a membrane system. A useful specification connects three quantities: incoming water quality, the required permeate at the point of use and the concentrate that the site can manage. A headline litres-per-hour value leaves those relationships unresolved.
Begin with a current feedwater analysis
Identify the source and its seasonal variation, including temperature, dissolved salts, hardness and relevant fouling or oxidant risks. Pretreatment is chosen to protect the membrane and manage those risks. More filter housings do not necessarily mean a better treatment train if they address the wrong feedwater problem.
Compare quoted production at the same feed conditions. Cold feedwater and changing salinity affect membrane operation, so a favourable catalogue test point may not represent the site. Specify both normal production and the lowest acceptable production under the agreed operating range.
Stages, passes and recovery describe different things
A membrane stage processes a stream within an array; a further pass treats permeate again. The marketing phrase “five stage” may instead count pretreatment and polishing components. Ask for a flow diagram with each stream labelled. DuPont's industrial RO configuration guidance explains membrane-array and concentrate-management arrangements.
Recovery is the proportion of feed collected as permeate. Increasing it reduces the concentrate volume but raises concentration within the system, affecting scaling and operating limits. It is a design result based on water chemistry and membrane conditions, not a percentage to maximize independently.
Size the production and delivery sides separately
An eight-hour daily production requirement differs from a short high-flow draw at a washing station. A storage tank and delivery pump can bridge demand peaks, but introduce tank hygiene, level control and recirculation questions. Include the distribution route and any further polishing when defining the delivered water specification.
Agree on conductivity or other relevant acceptance measurements, sampling locations and operating conditions. A stable skid outlet does not establish quality after an unsuitable tank or hose. Review service access for membrane removal, chemical compatibility of cleaning provisions and the handling of cleaning waste before freezing the layout.
The reverse osmosis system range can be configured around different industrial duties. Send shengtongjh the feed analysis, daily consumption, peak draw and required water quality so capacity and supporting equipment can be considered together.