What is the meaning of purified water treatment system recovery rate

Pure water equipment recovery rate, pure water equipment in the design of the technical program will generally have a system recovery rate data, but often the standard recovery rate, the actual recovery rate and the system recovery rate is different, and the actual use of the equipment we are to the actual recovery rate as a standard, water purification equipment, the system recovery rate by the quality of the water supply, the number of membrane elements and arrangement of a variety of factors such as the impact. Generally speaking, the better the water quality, the higher the system recovery rate, the more membrane, the higher the system recovery rate. Reverse osmosis device of pure water equipment due to the number of membrane elements, short water supply process, and thus the recovery rate of pure water system is generally low; and industrial large-scale water purification equipment reverse osmosis device due to the number of membrane elements, water supply process is long, so the actual recovery rate is generally more than 75%, and sometimes even up to 90%.

Detailed recovery rate of pure water equipment:

1. Standard recovery rate: membrane manufacturers in the standard test conditions to get the recovery rate, similar to when we buy a car manufacturers give the theoretical fuel consumption value. The low-pressure series of products of most brand-name membrane manufacturers, for example, has a standard recovery rate of 15%.

2. Actual recovery rate: This does not need much explanation, refers to the recovery rate of the membrane element when actually used. The actual recovery rate for the membrane element, in order to reduce the rate of contamination of the membrane element, to ensure that the service life of the membrane element, membrane element manufacturers of the actual recovery rate of a single membrane element is clearly defined, the requirements of each 1-meter-long membrane element, the actual recovery rate should not exceed 18%; but when the membrane element used in the second stage of the reverse osmosis system for water treatment, then the actual recovery is not subject to this restriction, allowing more than 18%.

3. System recovery rate: refers to the reverse osmosis device in the actual use of the total recovery rate, and the actual recovery rate is a little different. Actual recovery rate for the membrane element, while the system recovery rate for the entire water system.

How to calculate the actual recovery rate of water purification equipment:

The recovery rate of water purification equipment is mainly based on the length of the membrane elements in series and whether there is a concentrated water cycle and the size of the circulating flow rate and some other conditions to decide. If the system in the absence of concentrated water circulation, according to the number of membrane elements in series to determine the maximum recovery rate of the system.

How to calculate the recovery rate for multi-stage reverse osmosis water purification equipment, according to different situations to do different provisions.

For one-stage reverse osmosis, the first stage recovery rate (r1) r1 = the first stage of water production / the first stage of water intake × 100%;

The second stage of osmosis recovery rate for r2 = the second stage of water production / the second stage of water intake × 100%. The recovery rate of the second stage reverse osmosis is not the product of two levels of reverse osmosis system recovery rate. The concentrated water of the second stage reverse osmosis system is not discharged, but flows back into the inlet of the first stage reverse osmosis. Therefore, the recovery of multi-stage reverse osmosis equipment should be calculated according to the following standard: system recovery = total water production / total water intake × 100%.