Wastewater Treatment: Demineralisation/Deionisation
Deionisation and demineralisation provide a viable industrial wastewater treatment solution for
the effective removal of minerals and ions. Find out how.
(firmenpresse) - Industrial and commercial processes produce large quantities of wastewater. This requires prior
treatment before discharging into the municipal drainage system or the environment, in accordance
with the Environmental Agency in the United Kingdom. Different wastewater treatment solution
systems are available to reduce contaminants, toxins, and impurities of different types in order
to maintain the safety levels and standards.
Examples of toxins found in industrial liquid waste include chemicals, pesticides, oils, heavy
metals, pharmaceuticals, and other industrial by-products. Among the popular purification methods
employed by reputable companies in industrial liquid waste treatment are demineralisation and
deionisation - both of which employ ion exchange processes. Though used interchangeably, these
methods are different.
Ion Exchange
This is a wastewater treatment solution that involves removing ions from contaminated
industrial water by exchanging them with less harmful ones of similar charge, using resin beds.
Contaminated water is forced through the resin beds under high pressure, where the exchange
process takes place. The positive ions (cations) of the resins will bind negative ions (anions),
and vice versa, to achieve purified liquid waste with fewer toxins. This can be discharged or
reused, while water with high levels of displaced ions is collected and treated before
disposal.
Over time, the effectiveness of resin beds decreases due to the high content of ions from the
purification process, which requires renewal. This renewal process is called regeneration, where
toxic ions are removed by replacing them with new ions. This process is effective in removing
calcium, magnesium, certain organic contaminants, heavy metals, nitrate, arsenic, sulphate, and
fluoride.
What is Demineralisation?
Demineralisation is a process of removing minerals by various methods, such as ion exchange,
reverse osmosis (RO), and others. However, this wastewater treatment solution has been restricted
to ion exchange; hence, it is used interchangeably with deionisation.
Reverse osmosis uses pressure higher than the osmotic pressure to force water through a
semipermeable membrane, where up to 99% of toxins and impurities are trapped on the membrane while
water passes through. Purified wastewater, called permeate, has fewer toxins, while brine or
unfiltered wastewater is stored for further purification.
Deionisation
Deionisation solely relies on the ion exchange process to remove cations and anions from
contaminated liquid waste. Typical cations include calcium, magnesium, and iron, while anions
include sulphate, nitrate and carbonates.
Similarities and differences
These wastewater treatment solution methods utilise an ion exchange process in a deioniser
plant; however, demineralisation also includes other processes such as reverse osmosis.
When focusing only on the ion exchange process, they refer to the same thing.
They both remove ions and minerals; however, other methods of demineralisation may not be
effective at removing some ions, especially those with smaller sizes.
Products Used in These Systems
Various products employ ion exchange systems, and they are as follows:
Short-cycle demineraliser units: Units that undergo regeneration for a period
ranging between two to two and a half hours. Some units only require 30 minutes.
Counter-current demineraliser units: Employ a technique where the chemical used to
rejuvenate the resin beds or the regenerant chemical is supplied in the direction opposite to
service flow.
Multiport valve technology: To facilitate easy operations, multiport valves are
installed in treatment plants to allow multiple functions and settings within a single valve body.
These are typically found in smaller-sized plants.
Diaphragm valve: Used in larger plants to control the flow of chemicals, sludges,
and other fluids and to allow easy access for servicing and maintenance.
Deionisation and demineralisation are viable industrial wastewater treatment solutions
effective in the removal of minerals and ions. They produce purified wastewater that meets the
required environmental standards. For a system that is appropriate to your unique industrial and
commercial needs, it is important to consult a reputable and experienced professional to install
and maintain a waste treatment system.
Themen in dieser Pressemitteilung:
Unternehmensinformation / Kurzprofil:
Sean Clifford is an advisor at AllWater Technologies Ltd, a wholly independent company
providing consultation, equipment and the most effective wastewater treatment solution for your
business, including reverse osmosis water systems. Bringing together a host of experience and
specialist knowledge, the company is committed to building and maintaining long-term relationships
and creating maximum value and benefit for their customers.
Datum: 15.02.2024 - 13:36 Uhr
Sprache: Deutsch
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