In the pharmaceutical industry, purified water equipment is one of
the common equipment.
It adopts pretreatment, reverse osmosis technology, ultra-purification treatment and post-treatment and other methods, which can almost completely remove the conductive medium in the water, and remove the colloidal substances, gases and organic matter that are not separated from the water to a very low degree
.
Due to the stable effluent water, in addition to the pharmaceutical industry, purified water equipment is also widely used in electronics, semiconductors, beverages, automotive and other industries
.
However, in the process of use, many customers often encounter the problem of poor effluent quality of purified water equipment, which affects the effect of ultrapure water treatment in the later stage, then, what is the cause of this, and how to deal with it?
Some technical personnel of pharmaceutical machinery enterprises said that there are many reasons affecting the water quality of purified water equipment, including poor water quality of inlet water and equipment not being cleaned regularly
.
Among them, the quality of the inlet water is the key factor, and it is also an important condition to
ensure the long-term stable operation of the purified water equipment.
"Generally, before the design of the purified water equipment, the engineers of the design department will generally collect and analyze the raw water quality data of the customer's location, and design the overall process
on this basis.
" The above-mentioned personnel said that due to the influence of geological factors in individual areas, such as large sediment content and large mud content of water quality, this water quality needs to be pretreated to ensure that the water quality reaches the range of the purified water equipment treatment reverse osmosis inlet water index, and then reverse osmosis filtration treatment is carried out to ensure the normal operation
of the purified water equipment.
The so-called pretreatment refers to the processing of samples extracted during the production process to meet the requirements
of the detector for the status of the sample.
Generally, it is to remove dust, steam, fog and harmful substances and interference components in the sample to be analyzed, adjust the pressure, flow rate and temperature of the sample, etc.
, and ensure that the sample meets the conditions
of use specified by the analytical instrument.
For the case of poor local water quality, in order to protect the reverse osmosis system of ultrapure water equipment and ensure the quality of effluent water, pretreatment will play an important filtering role
in it.
Therefore, the user processes
according to the actual situation.
For example, when the carbonate hardness in the raw water is high, lime can be added to pre-soften while the turbidity is removed
.
However, the current method used more is to use cation exchange resin or add scale inhibitors; When the organic matter content in the raw water is high, it can be treated by methods such as chlorine, agglomeration, clarification filtration, etc.
, and if the water inlet requirements of the subsequent process are still not met, the measures
for removing organic matter such as activated carbon filtration can be added.
Related devices
have also been introduced on the market for pre-processing.
The general pretreatment system consists of a multi-media filter, a softener and an activated carbon filter, and the functions of each component have their own characteristics
.
Among them, the multi-media filter uses quartz sand of different particle sizes to form several filter layers, which can help remove suspended solids, colloids, and other particles in the
water.
The softener filter passes the original water through the sodium cation exchange resin, which can reduce the hardness of the raw water and prevent fouling
on the surface of the reverse osmosis membrane.
The activated carbon filter plays a role
in adsorption and removal of pigments, odors, organic matter and residual chlorine in water.
In addition to the above factors, it is also important
to clean the purified water equipment regularly.
"If the purified water equipment is not cleaned for a long time, it is easy to breed a large number of bacteria, which will affect the safety of water quality and the purity of water quality, and bring the phenomenon that
the output of pure water is not up to standard to the purified water equipment.
"
