Micro Media Filtration Proving Effective in RO, Ion Exchange Pretreatment
By George Di Falco
Having an effective, durable water pretreatment system in advance of reverse osmosis (RO) or ion exchange systems is the first, most critical line of defense – ensuring smoother, more trouble-free performance downstream. It’s especially true when dealing with today’s RO and ion exchange technologies, which require total suspended solids of 0.1-0.5 mg/L, turbidities of 0.1-1 NTU and silt density index values of less than five, and ideally less than three.
There is no such thing as a standard pretreatment process. Direct media filtration, multimedia filtration, microfiltration and ultrafiltration have all be used successfully. All have their own challenges.
In recent years, multi-media filtration has advanced considerably – now boasting superior filtration relative to conventional media filters and filtration efficiency approaching levels similar to ultra filters and micro filters.
Combining greater filtration efficiency with the durable nature of media filtration means a significant reduction in cleanings, overall downtime, and many other related costs for plants.
One example is a system offered by design and manufacturing firm Eco-Tec Inc. The company’s Spectrum Micro Media system is basically a two-layer depth media filter with a number of features that depart from conventional designs; namely, a coarse media upper layer of either anthracite or nutshells, and a fine micro-media lower layer.
The lower, fine micro-media layer is the key feature compared to conventional designs. While dual media filters typically employ silica sand with an effective size of about 0.35 mm, the Spectrum filter uses a lower layer of high density media with an effective size of less than 0.1 mm.
The flow channels through the micro media are extremely small and the tortuous path of fine channels provides excellent retention of solids. The micro media is much heavier in density than coarse media which ensures that it reclassifies (resettles below the coarse media after backwashing) and is virtually impossible to backwash out of the filter vessel.
Reverse Osmosis System Water Filter - News
Having an effective, durable water pretreatment system in advance of reverse osmosis (RO) or ion exchange systems is the first, most critical line of defense – ensuring smoother, more trouble-free performance downstream.
Unlike a conventional resin filter, which becomes less effective in reducing water hardness as it ages, RO filters provide consistent water quality throughout the product's lifetime. Water filtered by the SGLP2 System can be combined with a controlled
Like perchlorate, hexavalent chromium can be removed from water through reverse osmosis. According to NSF, it can also be removed through distillation and certain types of water filters. EPA proposes to streamline the regulation of additional toxins by
The water can be filtered again with deionization filters and reverse osmosis to remove dissolved solids — such as minerals and salts — and a special filter designed to remove perchlorates can be used as well. The water then passes through an
Like perchlorate, hexavalent chromium can be removed from water through reverse osmosis. According to NSF, it can also be removed through distillation and certain types of water filters. EPA proposes to streamline the regulation of additional toxins by
Articles 20VN | Reverse Osmosis Water Filtration Systems - Which ...
Reverse osmosis water filtration systems come in many varieties. Some seem to work better than others. It really depends on your personal household needs. Taking a look at some of the different types, the pros and cons and the output of the filters will help you to make the best decision for your water filtering needs.
One type of reverse osmosis water filtration system is a reverse osmosis and ultra filtration floor water cooler. This system has 9 stages of filtration, the first of which removes many of the organic contaminants that may cause the water to taste bad and cause an odor. These contaminants include chlorine, pesticides, PCB's, VOCs (volatile organic compounds), insecticides and herbicides.
The second stage removes inorganic compounds such as salts and metals. However this system does remove minerals as well which is one of the disputed areas of water filtration. The minerals that are present in water are considered an essential element for good health. Each stage of the system removes different bacteria and contaminants as well as dirt and rust that may be present in the water. This system has the capacity to clean 1.45 gallons of water per hour.
Another type of reverse osmosis water filter is a portable 3-stage system. This RO water filtration system can provide up to 50 gallons of clean water per day. However, this filter does not have the typical storage tank. This system provides a steady drip of the water that is filtered and you must collect it in your own receptacles. The system is not intended for immediate use of the water as it is filtered.
Still another type of RO water filter is the countertop water cooler. This reverse osmosis water filtration system has 9 stages through which the water passes. The removal of organic contaminants as well as chemical contaminants present in the water you drink is the objective of this system.
It is a countertop system and has a separate hot and cold water power switch. There is an automatic shut off when the water is heated to the required setting and when the tank is empty. The hot water heating capacity is 1.45 gallons per hour and the cooling capacity is 1.95 gallons per hour.
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