What is a Centrifugal Dryer?

Centrifugal Dryers are basically a spin dryer. They are typically used when parts are being processed in bulk. The parts may be placed into an appropriate size basket that then is inserted into the dryer. The Centrifugal Dryers is then closed, turned on and spins the basket at a very high speed to force any liquid, oil, etc. to leave the part. Along with the spinning action drying the parts, an optional heater can be installed to offer adequate time in drying the samples.

Special Centrifugal Dryers features

• Polypropylene liner for corrosive materials
• Stainless Steel Construction
• Automatic lid opening and closing
• Special Sizes

Wastewater Management Initial Steps

I found this great article from Samsco Corp
http://www.samsco.com/information-samsco-evaporation-initial-steps.html


There are two initial steps that companies can take to help reduce their wastewater volumes:

1. Generate less wastewater by better controlling manufacturing processes.
2. Recycle the process/manufacturing waters, if cost-effective and practical.

1. Generate Less Wastewater

Companies should focus on controlling manufacturing variables that can directly reduce wastewater generation. But there is a caveat: manufacturers should be careful that their waste-reduction effort does not create critical and negative manufacturing issues nor erode product quality (produce rejects). The pursuit of environmental compliance should not become the "disposal tail that wags the production dog".

2. Recycling

Recycling is potentially a good approach for reducing wastewater volumes and, when appropriate, reusing process chemistries. This is often the preferred method when handling large volumes of wastewater or when the new process chemistry is expensive.
Traditional methods of recycling can often be time consuming and expensive. In addition, traditional efforts can often generate "out-of-spec" water that is not reusable or dischargeable (see Issues to Consider, for other concerns).
The Samsco WasteSaver™ Vacuum Evaporator and the Samsco EnviroStill Mechanical Vapor Recompression (MVR) evaporator now offer a better alternative to traditional recycling methods.
These technologies produce "distilled water" that typically exceeds most incoming city water specifications. In addition, the concentrated chemistry can often be reused because the process is conducted under vacuum at a relatively low temperature.
For more information see The WasteSaver Vacuum Evaporator and The EnviroStill MVR Evaporator .

Issues to Consider

Heavy commitment to the daily management of wastewater chemistry

• Time
• Discipline
• Manpower
• Training
• Cost

Even if all recycling conditions are consistently met:

• Endpoint of the chemical life of process waters is inevitable
• Spent process waters still require a disposal plan and methodology (typically hauling off-site or evaporation)
• Method is inflexible and cannot handle multiple, varying waste streams

Filter Cylinders

Did you know that cylindrical filters are made of polyester felt that's been treated with resin then baked in an oven?  The oven curing helps to provide the tell-tale rigidity that makes these filters self supporting. Which means there is no need for support screen or springs with cylindrical filters, they stand tall on their own. The most common pore size is a 40 micron for this particular type of oil coalescing filters. However, cylindrical filters can be made in a variety of micron ratings.

Applications for filter cylinders include:

• Breather filters on military equipment
• Air filters prior to air compressors
• Oil coalescing filter

Knit tubing

Some application require more than a standard filter. Some times there is too much "stuff" to be filtered out, and a standard filter clogs too easily. We've found that is when knit tubing can really come in handy. It excels at removing the big particles. 

How to use it?

• Well it could be as easy as tying a piece of kit tubing over top your existing filter. When it gets clogged just remove, clean, and return. This can dramatically increase the life of your more expensive filter.
• Run the solution through the knit tubing, think a nylon on the end of the washing machine hose. Fill it up and throw it away!
• Need your solution to be a uniform consistency? Use knitted tubing to filter out clumps and chunks.  

Those are just a few ideas! 

About Lakeside Water Treatment

Reliable & Innovative Provider of Commercial and Industrial Water Treatment Systems

They have established themselves as a reliable and innovative provider of commercial and industrial water treatment equipment throughout the world.

Their product offerings include water softeners, dealkalizers, demineralizers, filters, reverse osmosis, and condensate polishers. They incorporate other products such as forced air decarbonators, bulk brine silos, regeneration stations, chemical feed systems and neutralization systems, to provide a complete sole source water treatment package to the end user customer. Their technically trained sales and engineering staff, not only provide you with products, but also provide you with sizing and selection assistance in order to make sure that the equipment selected is the best choice for the project.

Lakeside Water Treatment Inc. was founded in 1990 by experienced water treatment professionals. They average over thirty years of industry experience per employee. At the same time the latest in CAD and computer networking technology is being utilized. Their engineering staff has evolved from the water treatment industry bringing together at one facility, the necessary process, controls and manufacturing expertise to produce the type of quality built equipment that you can trust to perform.

They are located on the northwest side of Milwaukee. Customers are welcome, at any time, to tour their facility and learn more about how Lakeside can assist their efforts.

Filter Presses

Filter Presses have been the focus of Met-Chem manufacturing for many years. They have built a solid reputation for building quality Filter Presses and Complete Waste Treatment Systems. Their filter presses have been used in many different industries; from plating and metal finishing to chemical and food processing. Met-Chem Filter Presses feature heavy duty steel construction with polypro gasketed plates. One great feature about Met-Chem's filter presses is that they are always expandable for larger future capacity by adding longer sidebars and additional plates.

Poly Products CorroDuct™ Line

New Product! Poly Products Corro-Ducts™ CORROSION RESISTANT DUCTING

These virgin molded polyethylene Corro-Ducts™.  are made as one piece with NO SEAMS. As we know welds have been known to crack and leak over time, especially in chromic acid and other hazardous chemicals; However that won't happen with these neat Corro-Ducts™.


Each Corro-Duct™ has a “Slip Fit” end so that it will easily slide into the adjacent matting Corro-Duct™. Sealant may be used but is not required. With the variety of combinations available from the interconnecting Corro-Ducts™ it will be easy to maneuver around any obstruction.

Filter Press FAQs

1.         How do I know when the filter press is full?  The diaphragm pump will get to 30 second to one minute intervals between thrusts, indicating that pressure has increased due to solids building up inside the press cavities.  This is your signal that the press is full.

 

3.         What is involved in routine filter press maintenance?  Cloth cleaning, dumping, check hoses and connections.

 

4.         When do the cloths need to be cleaned or replaced?  The filter cake will begin to become wet, slimy and not as dry.  This is your indicator that the cloths need to be cleaned.  (see number 5 for cleaning info).  If you have already cleaned your cloths and your process has not changed but you are still getting slimy filter cake, it may be time to replace your cloths.  Cloth life varies from installation to installation and depends on such variables as frequency of cycles, proper cleaning and maintenance and the type of sludge that is generated.  Generally speaking for most installations cloths can last up to 6 months at the most.

 

5.          Will I need to replace the plates?  Plates generally last years unless they become cracked, broken or warped.  It is good practice to examine the plates during press cleaning and dumping.

 

6.         Can I expand my press for larger loading capacity?  Expansion depends on a couple of factors.  First, if your press is already expandable, meaning you’re your press has a distance piece for expansion to a larger capacity, all you need to do is unbolt the distance piece and add additional plates in the 1-3 button sequence taking care that you add plates in even numbers.  However, if you have a Met-Chem press or your press has notched and bolted sidebars, then  it can also be expanded by removing the sidebars and replacing them with longer sidebars and installing additional plates.  Please note that when adding plates, you must be sure to add them in the 1-3 button sequence in order to provide proper drainage.

 

7.         Can I add more plates to my current press?  You may be able to add a couple of plates without expanding your sidebars if your press is not already expandable but care must be taken to ensure that you have adequate cleaning room when dumping the press and cleaning the cloths.

 

8.         How long is the cycle time?  Cycle time is dependent on solids loading and can take anywhere from 2-4 hours on average.  (Closer to four hours for typical metal hydroxide waste.)

 

9.         What can I do to ensure the driest possible filter cake?  Be sure cloths are cleaned as needed and the air blow-down system is run for a full cycle.  You may also wish to add a sludge dryer to your system.  A dryer accepts filter press cake and dries it further to provide up to a 4:1 sludge reduction.  (for more information on sludge dryers click the following link:  www.metchem.com/sludge_dryer.htm

 

Molecular Sieve

Description:

4A molecular sieve is primarily used for removing moisture from liquefied gaseous materials. Advantages are consistent adsorption speed, higher contamination resistance, stronger crushing increasing cyclic times for extended product life.

4A molecular sieve has a pore size of 4A or 4 angstrom. Any molecule larger than 4A will not be able to be adsorbed. 4 Angstroms are the sodium forms of the Type A crystal structure. The sequence rate of adsorption is argon, krypton, xenon, ammonia, carbon monoxide, C2H4, C2H2, CH3OH, C2H5OH, CH3CN2, CS2, CH3CL, CH3Br, and carbon dioxide.

The advantages of our high quality 4A mole sieve are consistent adsorption speed, and higher contamination resistance, stronger crushing increasing cyclic times which provide an extended product life. 4A Molecular Sieve is primarily for removing moisture from liquefied and gaseous materials.

Applicaitons:

It has become one of the most reliable desiccants for a variety of applications including:

• Refrigerant Drying
• Moisture removal in PU Plastic or Paint
• Natural Gas Drying
• Drying Cracked Gas
• Static drying of insulating glass units, whether air filled or gas-filled.
• Dehydration of highly polar compounds, such as methanol and ethanol.
• Dehydration of unsaturated hydrocarbons (e.g. ethylene, propylene, butadien).

A Sketch of Polypropylene Textile Cloths

Thank you to by: Walter Senney, Met-Chem Group President and Lamports Filter Media

One of the most popular fibers used to manufacture fabric today is polypropylene. It can be woven into a variety of thread counts to allow from loose to tight filtration applications. Polypropylene is good for use in temperatures from 50°F to 180°F (Specification charts show use up to 250°F under limited applications is acceptable, (but I would not recommend it). The acceptable pH range for products filtered with polypropylene material is 2- 12.  Polypropylene can be woven in the following ways:

• Multi-filament uses a number of fibers rolled together prior to weaving the cloth.  This allows for a smooth finish and normally tight filtration. This cloth is normally used for filtration in pressure leaf filters for chemicals, liquid foods and some lower solids wastewater; as well as for anode bags in plating applications.
  
  
• Mono-filament uses a single fiber (like fishing line) to weave the cloth. This allows for a slick non-absorbing cloth that can be used in the same applications as multifilament, but is normally not as tight for filtration.  This type of cloth works well for screening and more open filtration applications.
  
  
• Mono/multi filament blend is a cloth woven out of both fibers, one is woven in one direction, while the other is woven in the other direction. This cloth can give us the best of both worlds in terms of tight filtration and a slick face for ease of cake removal. One of the major uses of this cloth is on filter presses for process filtration and heavy solid waste water applications.  
  
• Felt is the needle punching of these fibers into a thick material used regularly for filtration of paints, coolants and a variety of liquids. Micron ratings can go nominally from 1-100. These felts can be supported by an internal scrim or they can be non-supported.  The supported felts can hang from a ring to filter, while the non-supported must be put in a pressure vessel supported by a basket to avoid blowout. 

This is just a thumbnail sketch of polypropylene textile cloths. These cloths can filter “the birds or the worms” depending on the type and tightness of the weave.