Monthly Archives: April 2017

Using A Walnut Shell Filter As An RO Protection Filter

The purity of boiler feed water can be a critical part of the manufacturing process. This water needs to be free from contaminants in order for the boiler to operate correctly, without frequent shutdown for maintenance. For this reason, a membrane filtration train is frequently used. Unfortunately, the exposure of plant water to the manufacturing process means that the feed water can be contaminated with both high levels of oils and solid material. Frequently, the membrane filtration will need an upstream filter, to extend the life of the filters and protect membranes.

The STiR walnut shell filter was selected by a global tire manufacturer to solve issues related to its’ membrane filtration train. This train includes reverse osmosis and nanofiltration, and was made unviable by high levels of oil in its’ boiler feed water. Oil levels were high enough that the train was taken offline until a solution could be found, and the recirculated water could not be used in the boiler.

Walnut shell media was selected because of its’ ability to remove free oils and greases without causing damage to the media bed. Sand filters and carbon filters may blind prematurely when exposed to free oils, necessitating frequent bed changes. Walnut shells catch oil droplets on their surface, which are easily removed during backwash cycles. This means that a walnut shell media bed does not need to be replaced when exposed to oil, and has a lifespan of approximately 20-25 years.

The walnut shell filter was able to protect the RO system and nanofiltration membranes, significantly reducing the oil load to them. The free oil concentration were reduced from as high as 85 ppm, to less than 1 ppm. This reduced frequency of membrane fouling, reducing the total purchasing cost. It also reduced the maintenance requirement of the membrane filters, while protecting the RO system from oil slugs which had caused it to rapidly foul. Additionally, water heating costs were reduced, as water could now be sent directly back to the boiler.

How To Choose The Best Industrial Water Filtration System For Mining Applications

Over the course of the past few decades concern for the environment has brought about a large number of new regulations concerning the use of water in mining operations. These include how it is accessed, and how it is treated, using industrial water filtration to ensure all waste water generated meets with acceptable standards of cleanliness.

In the mining industry, things like overburden, waste rock, and tailings are considered by many to be among the largest forms of waste generated. However, another major pollution source is the water directly discharged from the mining process, proving that proper industrial water filters are vital to protecting the environment.

The Need For Industrial Water Filtration By The Numbers

According to the latest statistics, over 70% of all pollutants produced by the mining industry (this includes both open pit and underground mining) are emitted via the water used in the process. This water must be processed through high quality industrial water filters in order to avoid the release of toxic materials into the environment. Heavy fines may be levied against those who fail to meet required standards.

Filtra-Systems Offer Superior Industrial Water Filters

There is more to choosing the best industrial water filtration system than cost. The first, and perhaps most important of these is the ability of the industrial water filters you choose to remove the contaminants from the water.

Operating and maintenance costs must also be factored in. Filtra-Systems STiR filter uses a highly efficient mixer and backwash method, while utilizing walnut shells as a filter media to remove contaminants from the water. Walnut shells were chosen for their ability to remove sticky solids and oils from the water, and for their ability to be used for longer periods of time between cleanings. Not only does this increase the effectiveness of our industrial water filters, it also served to reduce operation and maintenance costs.

The STiR system is capable of removing up to 95% of all suspended solids and insoluble hydrocarbons without the addition of chemicals. A single industrial filtration unit can process between 50 and 6500 gpm based on the application, making the STiR filter one of the most effective and efficient industrial water filters on the market today.

If you would like to learn more about Filtra-Systems and our STiR Industrial Water Filter, contact us today. We look forward to hearing from you!

Should You Select Bag Or Cartridge Filters For Your Industrial Application?

When it comes to industrial filtration, there are several different filter types to choose from when working with industrial grade liquids, including both bag filters and cartridge filters. Ultimately, however, the final choice comes down to choosing the right filtration technology to meet the performance demands of your facility, while remaining within your projected operating costs. Both bag and cartridge style filters offer removable media, but the final decision should be based on the application, as each type of media has its advantages and disadvantages.

Bag Filters

Bag filters are often the best choice for any number of industrial applications. These types of filters use a wide range of filtration media based on the application, such as activated carbon, needle felt, and nylon monofilament mesh. The operate by trapping waste solids inside the bag and are considered to be a relatively low-cost form of industrial filtration.

However, these filters have a smaller surface area than most cartridge filters. The low overall operating cost makes bag filters an excellent choice for small batch operations where the cost of a self-cleaning system would not be justified. Along with this, small operations will not have a high bag replacement frequency leading to lower disposal costs. Bag filtration systems tent to produce less solid waste than cartridge filters, making them an excellent choice for applications where the user wants to minimize their volume of waste.

Cartridge Filters

Cartridge filters capture solid contaminants on the outer surfaces of the filter media. These types of filters run the gamut from inexpensive bonded units to more expensive models made from a variety of high-capacity pleated types of media. These filters can be used for a wide range of applications where sub-micron filtration is needed. These include beverage and food production facilities, chemical and paint plants, and applications where the filtration of acids and bases is required. Cartridge filters are also ideal for pharmaceutical applications as well as those in which ultra-pure water filtration is required.