What is the interception index of ultrafiltration membrane, and the question of ultrafiltration memb

Among the three standards for ultrafiltration membranes, the standard HY T050-1999 method is used for the test of rejection performance. In this standard, the following reference substances are specified for the measurement of the rejection performance of ultrafiltration membranes: polyethylene glycol (molecular mass u); cytochrome c (molecular mass of 13,000U); ovalbumin (molecular mass 45,000u); Bovine serum protein (molecular mass 67,000 u).

Flux: The rate at which water passes through.

Molecular weight cut-off: The size range of the molecule that can be intercepted.

Rejection: The percentage of molecular weight cut-off.

First, the situation of ultrafiltration and reverse osmosis is different; There are two main reasons for this:

1. The backwash frequency of ultrafiltration is very high, and the backwash frequency of the normal design (according to the water quality) is about 60 minutes, and the membrane fouling generated when the ** rate is high can be restored by backwashing;

2. The structure of ultrafiltration membrane and reverse osmosis are also different, the general ultrafiltration used is a hollow fiber membrane, the flow rate in the membrane tube is higher (internal pressure type), and although the external pressure type is poor, it is generally selected for air washing;

Second, how to understand ultrafiltration membrane products and seek technical support from ultrafiltration membrane manufacturers is the key to reasonable design.

Therefore, when you are choosing a membrane product model or your ultrafiltration membrane model and manufacturer have been determined, you need to carefully understand the membrane product specification and related design information, and it is best to let the membrane manufacturer provide some technical support (very important). In this way, you will not make mistakes in principle when designing the parameters of the membrane, such as backwashing, cleaning, arrangement, and rate.

Hope it works for you! Thank you!

I don't understand what the landlord wants to ask, ultrafiltration membrane and reverse osmosis membrane are different, there is no arrangement and combination, as long as the number of membrane elements is selected according to the amount of water, two in a row, or four in a row, installed on the membrane frame, what is the principle of arrangement and combination.

1. If you want to talk about the principle of ultrafiltration membrane arrangement.

Mainly, the water yield of a single ultrafiltration host and the support of the membrane are problematic.

If a set of ultrafiltration host uses too many membrane modules, it will increase a lot, pipes, elbows, resulting in the water inlet pressure of each membrane, and the pressure of backwashing are different, which will lead to fluctuations in the system and water production, which will have an impact on the system and service life of the membrane.