Published 2026-07-04T12:22:00+08:00
River water usually cannot go directly into reverse osmosis without careful pretreatment.
The pretreatment route must control turbidity, suspended solids, scaling risk, and any seasonal quality change before the RO system.
Clear Answer First
If river water is used as RO feed, the system typically needs screening, clarification or filtration, and then a final pretreatment stage before the membrane train.
Why River Water Needs Pretreatment Before RO
RO membranes are sensitive to solids, turbidity, and unstable raw water quality. River sources may change with rainfall, season, or upstream conditions, so pretreatment helps protect membrane performance.
Typical Pretreatment Route
Common route examples:
- screening -> clarification -> filtration -> RO
- screening -> filtration -> RO
- screening -> clarification -> filtration -> UF -> RO
Design Inputs
Pretreatment selection should be based on:
- raw water source
- flow rate
- water quality report
- seasonal variation
- target permeate quality
- recovery target
- available pressure
When Clarification Is Needed
Clarification is often needed when:
- turbidity is high
- suspended solids fluctuate
- the river carries a strong solids load after rainfall
- downstream RO protection is a priority
When UF May Be the Better Pretreatment Stage
UF may be selected when more stable membrane protection is required or when the feedwater quality is variable enough that media filtration alone is not enough.
FAQ
#### Can river water go directly to RO?
Usually not without pretreatment. The exact route depends on the raw water quality and project target.
#### Is filtration enough before RO?
Sometimes, but only when the feedwater is suitable. Many river water projects need more than filtration alone.
#### What information is needed before quotation?
Flow rate, raw water report, target water quality, recovery target, and project location are recommended.
CTA
Send your river water report and RO target data. YAOTONG engineers will recommend a pretreatment route.
CTA: Request Technical Proposal