Media Filtration Systems. Media Filtration System
Other Filtration and Purification Technologies
Media filtration is often used to lower the suspended solids loading and turbidity of the water source. Depending on the type of media, it can also be used to remove impurities, iron and/or manganese, as well as organic matter from the water. A media filtration system typically consists of a standard pressurized media filter loaded with a thick layer of media. Water enters through the filter inlet and percolates through the filter bed in a down flow configuration. When impurities encounter the media, it traps the material in the voids and clean water exists via the filtration nozzles through the filter outlet. The filtration rate depends on the effective size of the bedding and the water velocity through the filter. The filter is cleaned through back washing (reverse direction), causing suspension of the filter bed and casing the suspended matter to be released.
Backwash frequency and duration is design to minimise treatment water losses, ensuring an optimal recovery. A rinse cycle is also typically included to ensure the correct product quality post backwash cycle. Different types of media exist in the market. The type of media chosen is dependent on the quality of the source water, as well as the application and process requirements. Wise Water Ways generally makes use of Granular Activated Carbon (GAC), Activated Filtration Media (AFM), Katalox and/or DMI65, as and when required. Chemicals are often dosed in conjunction with the media filtration solution to condition and oxidise the water to ensure successful filtration. Reverse Osmosis
Reverse Osmosis and Softening
Reverse Osmosis (RO) is a process widely adopted to reduce dissolved salts from water. External pressure is applied to the contaminated water to overcome osmotic pressure, forcing clean water through a semi-permeable membrane and leaving the salts and contaminants behind. The amount of pressure required depends on the salt concentration of the feed water. The water that passes through the membrane is referred to as permeate (product water), while the water that remains along with the dissolved salts and contaminants is referred to as brine (reject water).
Reverse osmosis can remove many types of dissolved and suspended chemical species as well as biological ones (principally bacteria) from water, and is used in both industrial processes and the production of potable water. It is very effective in treating brackish, surface and ground water for both large and small flows applications. However, to have a sustainable, effective Reverse Osmosis plant, sufficient pre-treatment is crucial. Heavy metals (iron and manganese) with levels less than 0.2 ppm should ideally be fed to the plant, and no suspended particles should be present in the water. Additionally, antiscalant dosing should also be included in the process to lower the solubility of trace elements and minimize scaling, thereby ensuring the RO performance and longevity. The pretreatment process is very important, as lack of adequate pretreatment fouls the membranes and prevents them from being able to work effectively, leading to an extremely high OPEX.
At Wise Water Ways we do not only understand the RO process in depth, but also the importance of sufficient pre-treatment, preventative and predictive maintenance on the units to keep operation costs at a minimum.
pH Correction and Disinfection
The main objective of water treatment is not only to improve the water quality for the desired application, but to make water SAFE for use. Destruction or deactivation of pathogenic micro-organisms results in stopping their reproduction and growth; and is referred to as disinfection. Chlorination, ozone, ultraviolet light, and chlorine dioxide are primary methods used for disinfection and are normally implemented as a post-treatment step. The method of disinfection is determined by the specific needs and requirements of each project. At Wise Water Ways we often make use of ultraviolet (UV) light due to its strong germicidal (inactivating) ability and the fact that no chemicals are required. Although UV sterilization is an excellent way to disinfect water containing bacteria, viruses, and protozoans, it does not have a residual effect.
In applications where the water needs to be stored for a period or transported through extensive reticulation networks, chlorine disinfection will rather be implemented to ensure zero bacterial and virus activity post treatment.
To address the corrosive nature of various water sources, remineralization is implemented as post-treatment step. At Wise Water Ways we most commonly make use of calcite filters to remineralize water with low pH and alkalinity and/or water sources that have a low mineral content. Calcite (Calcium carbonate, CaCO3) is a natural substance used to increase the alkalinity of the water. Water is fed through the calcite filter, slowly dissolving the calcite to increase the alkalinity and pH level of the water. This process will stabilise and buffer the water in changing conditions and, thereby, prevent corrosion. Other methods of remineralization and pH correction are also implemented in the form of chemical dosing, as and when required.
Media Filtration Systems. Media Filtration System Cape Town. There are different water filtration solutions for different applications and the solution will depend on the end use and the water source. RO Water overs a wide range of different media filtration solutions for water filtration including diwater softeners and media filters for a wide variety of applications including whole house water filtration, reverse osmosis pretreatment and post treatment, and commercial industrial uses. Our water softeners and media filters are equipped with automatic control valves for hassle-free regeneration and backwash cycles. RO Water is also a stocking distributor of media filtration and ion exchange water treatment equipment. RO Water Systems filtration equipment features an excellent design with high-quality components to offer high performance. Our systems are designed for the longest lifespan with minimum energy consumption. Experience greater savings with lower maintenance and operation costs when you install our media filtration equipment.
Hyper Filtration Efficiency with filtration efficiency in the 3 to5-micron range, enhanced performance results in downstream cost savings for chemicals, filter cartridges, membrane cleaning, membrane life, etc. Higher Flow Rate, allows significant savings in initial equipment costs when compared to traditional media. The turbidity removal media allows for peak flow rates up to 20 gpm/ft2. Superior Water Clarity. Traditional sediment filtration media rely on mechanical straining to remove suspended solids for turbidity reduction. The turbidity media incorporates straining as well as ion exchange, sedimentation and flocculation to produce crystal clear water down to < 0.1 NTU of turbidity. Water Savings the loading capacity of this media is up to 1.5 times greater than multi-media and up to 2.8 times greater than sand filters. This results in longer run times with less frequent backwashing, resulting in significant water savings. Website Design Services
A media filter is a type of filter that uses a bed of sand, peat, shredded tires, foam, crushed glass, geo-textile fabric, anthracite, crushed granite or other material to filter water for drinking, swimming pools, aquaculture, irrigation, stormwater management, oil & gas operations, and other applications. One design brings the water in the top of a container through a “header” which distributes the water evenly. The filter “media” start with fine sand on the top and then graduatingly coarser sand in a number of layers followed by gravel on the bottom, in gradually larger sizes. The top sand physically removes particles from the water. The job of the subsequent layers is to support the finer layer above and provide efficient drainage. As particles become trapped in the media, the differential pressure across the bed increases. Periodically, a backwash may be initiated to remove the solids trapped in the bed. During backwash, flow is directed in the opposite direction as normal flow. In multi-media filters, the layers in the media re-stratify due to density differences prior to resuming normal filtration.
Media Filtration System
Filtration is used in combination with coagulation for the removal of particulates. This prepares the water for use as potable, boiler or cooling make-up. Clarifier effluents of 2-10 NTU may be improved to <1 NTU by conventional sand filtration. Modern mixed media, AFM and zeolite filters offer effective filtration down to as little as 5 micron. We stock a variety of filter medias for different applications, including specialized medias such as DMI-65 for iron removal and Aquastab for pH and alkalinity rectification. A mixed media filter refers to a type of filter bed which is graded by size and density. Coarse, less dense particles are at the top of the filter bed, with finer, more dense particles nearer to the bottom. Down-flow filtration allows deep, uniform penetration of particulate matter into the media bed and permits high filtration rates and long service runs. The smaller less dense particles tend to remain at the bottom of the filter even after high-rate back washing. Thus, the different media layers remain intact in the mixed media filter bed.