Home

Secondary reverse osmosis equipment

A two-stage reverse osmosis purified water system is equipment that produces ultrapure water using a two‑stage reverse osmosis process. The second stage further purifies the permeate from the first stage. Reverse osmosis systems are configured with different processes depending on the quality of the source water.

Category:

Filtration equipment

Consult Now

Product Description

I. Equipment Overview
A two‑stage reverse osmosis (RO) water purification system is equipment that produces ultrapure water by employing a two‑stage RO process. The second stage further purifies the permeate from the first stage. Depending on the quality of the feedwater, the RO system is configured with different treatment processes. Typically, after passing through a single‑stage RO system, tap water yields permeate with a conductivity of less than 10 μS/cm; after a two‑stage RO system, the permeate conductivity can drop below 5 μS/cm or even lower. When combined with ion exchange or EDI units downstream, the system can produce ultrapure water with a resistivity of 18 MΩ·cm (where resistivity equals the reciprocal of conductivity).

II. Functional Description of Each Component and Accessory of the Equipment
1. Raw water tank: Primarily addresses the issue of unstable tap water pressure, reducing the frequency of pump startups during operation and minimizing mechanical failures caused by fluctuations in tap water pressure.
2. Quartz sand filter: Tap water enters the tank from the top and, after passing through the upper water distributor, flows uniformly from the top to the bottom of the filter bed. After passing through the filter bed, the water is collected by the lower water distributor and discharged as filtered water.
3. Activated Carbon Filter: The internal structure of an activated carbon filter is identical to that of a quartz sand filter. After adsorption by the activated carbon, the residual chlorine in tap water can typically be reduced to below 0.1 mg/L.
4. Precision Filter: Primarily uses a 5 µm melt-blown filter element to remove fine particles, further preparing the feed water for reverse osmosis.
5. High-pressure pump: Provides the necessary power for reverse osmosis operation.
6. Reverse Osmosis System: The reverse osmosis system is the core component of a reverse osmosis water purification unit. In its design, the primary considerations are the number, brand, and arrangement of the membrane elements.
7. Pure Water Tank: Used for storing purified water.

III. Process Flow
Raw water → Raw water booster pump → Multimedia filter → Activated carbon filter → Water softener → Precision filter → First-stage reverse osmosis → pH adjustment → Intermediate water tank → Second-stage reverse osmosis → Pure water tank → Pure water pump → Microporous filter → Point of use

IV. Process Flow Diagram