Product Introduction

The 8 T/H double-stage (two-pass) reverse osmosis (RO) pure water system produces pure water using the reverse osmosis process. The design is rational and the system operates stably, and its product water fully meets the required quality; the scheme has been verified in many similar projects. The equipment is easy to install, operate and maintain, and is characterised by stable operation, energy saving, environmental protection, a high degree of automation and cost-effectiveness.

Design Basis

• Reverse osmosis system design software.
• Feed water quality: meets the drinking-water quality standard; feed water temperature 5–45 °C.
• User requirements: product water flow ≥ 8 m³/h; product water conductivity ≤ 5 μS/cm.
• Control equipment, measuring instruments and electrical equipment are designed and manufactured in accordance with the relevant regulations and standards.

Process Description

Pre-treatment — Raw water is pre-treated to improve the feed-water quality and bring it up to the inlet requirements of the RO unit, thereby reducing and delaying membrane fouling and extending membrane life. Pre-treatment removes micro-organisms, bacteria, colloids, organic matter, heavy-metal ions, solid particles and free chlorine from the feed water, ensuring long-term stable operation of the RO unit. The pre-treatment train consists of a sand filter, a carbon filter, a water softener and a security filter.

• Sand filter: removes mud, impurities and suspended solids and reduces the SDI (silt density index) of the raw water.
• Carbon filter: performs adsorption and filtration; it removes chemical organics, heavy metals, colour, odour and residual chlorine from tap water and improves taste.
• Anti-scale dosing: prevents calcium, magnesium and other scale-forming ions in the raw water from scaling the RO membrane.
• Security filter: fitted with a 5-micron PPF cartridge, it retains particles larger than 5 microns and extends membrane life.

Reverse osmosis unit — The RO unit comprises a first stage and a second stage with intermediate boosting; product water from the first stage is re-pressurised and passed through the second-stage RO membranes for further purification, achieving a desalination rate of 98% and higher product-water purity than a single-stage system. The membrane removes organic matter (such as trihalomethane intermediates, colloids, suspended solids, micro-organisms, bacteria, algae and moulds), pyrogens and viruses.

The RO unit uses automatic control: changes in input signals such as high pressure, low pressure, liquid level, reset and switch alter the corresponding output signals of the inlet valve, high-pressure pump and flush valve, providing automatic control of a standard RO system with high/low-pressure protection, level control and automatic start-up, full-tank and cumulative flushing.

Key Features

• Rational design with stable operation and product water that fully meets the required quality.
• Easy to install, operate and maintain.
• Stable, energy-saving and environmentally friendly.
• High degree of automation, economical and practical.
• Desalination rate of 98%.
• Double-stage (two-pass) reverse osmosis for higher product-water purity.
• Multi-stage pre-treatment (sand filter, carbon filter, water softener and security filter) protects the RO membranes and extends their service life.
• Fully automatic high/low-pressure protection, level control and automatic flushing.

Technical Specifications

Process Flow

Raw water is drawn from the raw-water tank by the raw-water pump and passes through the multi-media (sand) filter and the activated-carbon filter, with anti-scale chemicals dosed to protect the RO membranes; the security filter provides final protection. The filtered water is pressurised by the first-stage high-pressure pump into the first-stage RO, then boosted again into the second-stage RO for further purification, before being stored in the pure-water tank.

Product Details

Applications

Reverse osmosis pure water systems are widely used to produce potable and beverage water, process water for the food and chemical industries, boiler feed water, and high-purity water for electronics, electroplating, pharmaceutical and laboratory applications.