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WATER & WASTE TREATMENT SOLIDS Fortunately, should our systems show signs
of increased suspended solids, corrosion, or other debris, there are a number of devices that can be used, including strainers, filters, magnetic filters, dirt separators, as well so commonly found side stream filtration. A number of systems have side-stream
filtration included at the design stage in order to safeguard some of the issues we have highlighted above. Such equipment is easy to install and has a simple process of solids removal. Side stream filters are designed to constantly pass 5-15% of the circulating water through a filter housing resulting in the total system volume being filtered two to three times every twenty-four hours. Differing grades are available and where a
system has known issues, a courser filter is typically chosen to remove the larger particles. Once the courser filter has removed these larger particles, systematic increases of finer filters are exchanged. Where a system has experienced high levels
of contamination, it is good practice to utilise specific water treatment chemicals to aid the recovery. Dependent on the issue(s), a series
There are various water treatment devices that can be used to deal with increased suspended solids, corrosion or other debris
of chemical products can be selected. ICS Cool Energy experts can help evaluate the correct procedure and select the chemicals to best address such issues. For example, scaling would require using an acid-based cleaning agent, microbiological issues are treated with selected biocides, and corrosion using a dispersant. Depending on the severity of the contamination, full chemical flushing can be avoided. Where lower levels of debris are recorded, it
is possible to undertake an online clean, as described above, with a mix of chemical treatment and filtration. As part of the metal surface cleaning process, it is critical to passivate the newly cleaned surface by the creation of a protective layer of magnetite. This is followed by the addition of corrosion inhibitors that disrupt the process of corrosion. ICS Cool Energy engineers can help with the selection and application of these products. Other Cleaning Systems include: Strainers: These are simple coarse solid
housed filters mainly used to collect larger suspended matter, used primarily to protect pumps and control valves.
Dirt Separators: This approach to ‘catch’ the
debris is, again, a simple theory involving slowing down the velocity of circulating water, coupled with allowing the flow of water and any suspended debris to impact on a mesh grid housed in an in-line vessel. Magnetic Separators: If the corrosion has
built up in the circulating water, inclusion of a magnet to attract any suspended corroded matter is an efficient method of capture and removal. These separators house powerful magnets which attract metallic material regardless of size.
ICS Cool Energy
www.icscoolenergy.com
NOVEMBER 2023 | PROCESS & CONTROL 23
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