A Met-Chem clarifier uses a parallel plate design. Water is fed into the inlet trough of the flocculation tank. The wastewater and polymer flocculant are introduced simultaneously in the flocculation mixing chamber, if that option is selected. The flocculated water then flows over the first baffle, then under the second and finally flows to the body of the clarifier. The overflow/underflow allows time for the solids to gain size so that they settle out more easily. The wastewater is then directed to the bottom of the cone and back up through the plate pack. Some solids will settle as the waste stream makes its way to the clarifier cone. However, some particulate will be pushed up to the plate packs. The 60 degree angle of the plates provides a highly effective settling area in a small footprint. As some solids are forced up to the plate pack they start to settle upon each other gradually becoming heavier and ultimately slide down the plate pack to the clarifier cone. The clean water overflows from the effluent port and is suitable to proceed to the drain to city sewer or to an inspection tank. Sometimes a portion or all can be polished and reused. The clarifier sludge is then pumped from the bottom of the clarifier into a sludge thickening tank to feed a Met-Chem filter press.
Showing posts with label Filtration. Show all posts
Showing posts with label Filtration. Show all posts
Tuesday, May 1, 2018
How does a clarifier work?
A Met-Chem clarifier uses a parallel plate design. Water is fed into the inlet trough of the flocculation tank. The wastewater and polymer flocculant are introduced simultaneously in the flocculation mixing chamber, if that option is selected. The flocculated water then flows over the first baffle, then under the second and finally flows to the body of the clarifier. The overflow/underflow allows time for the solids to gain size so that they settle out more easily. The wastewater is then directed to the bottom of the cone and back up through the plate pack. Some solids will settle as the waste stream makes its way to the clarifier cone. However, some particulate will be pushed up to the plate packs. The 60 degree angle of the plates provides a highly effective settling area in a small footprint. As some solids are forced up to the plate pack they start to settle upon each other gradually becoming heavier and ultimately slide down the plate pack to the clarifier cone. The clean water overflows from the effluent port and is suitable to proceed to the drain to city sewer or to an inspection tank. Sometimes a portion or all can be polished and reused. The clarifier sludge is then pumped from the bottom of the clarifier into a sludge thickening tank to feed a Met-Chem filter press.
Tuesday, April 24, 2018
Clarifiers for wastewater treatment, manufactured by Met-Chem are the inclined parallel plate design that are used as part of a wastewater treatment system for solids settling. They are constructed of carbon steel with coal tar epoxy lining on the inside, and epoxy coating on the exterior. The internal plate packs are set at 60 degrees for optimum settling and are constructed of a coal tar epoxy-coated steel shell with plastic plates.
Learn more about industrial clarifiers here >>
Wednesday, February 14, 2018
Filter Press Pumps that can handle the slurry
Filter Press Diaphragm Pumps
Air operated diaphragm pumps are used with filter presses to pump sludge from the bottom of the sludge holding tank into the filter press. These pumps are ideal because they can handle the slurry which is generally about the consistency of a milkshake.
The diaphragm pump usually starts out slowly and gradually ramps up. Once the pump starts to slow back down, (30-60 seconds between thrusts), it is usually an indicator that the filter press is full. At this point the feed pump should be turned off and the valves on the filter press closed as the operator prepares to operate the air-blow-down process.
The diaphragm pump can be manually turned up or an Automatic Pump Control system may be added. This starts the pump at 25 psi, then moves up to 50, 75 and finally 100 psi which is standard operating pressure for the pump.
Met-Chem provides diaphragm pumps in the following sizes: 1”, 1.5”, 2” and 3”. Material of construction ranges from cast iron, aluminum, polypro or stainless steel.
With the purchase of a new Met-Chem filter press Met-Chem can mount your air operated diaphragm pump to the legs of your filter press. This option also includes a flex hose that connects the outlet of the diaphragm pump to the center feed pipe, an air filter, a regulator, and an oiler. We can also provide a mounted diaphragm pump for your existing press.
for more information on Filter Press Pumps visit Met Chem
Thursday, September 25, 2014
Met Chem Inc.
Over the years, Met-Chem has acquired complimentary companies to add to our group of process equipment and replacement parts suppliers. Met-Chem’s equipment manufacturing began with filter presses and clarifiers and gradually grew to include sludge dryers and complete waste treatment systems and component parts.
Their equipment has been used in a variety of industries from plating and metal finishing to chemical, food and beverage processing to name a few. Met-Chem features heavy duty steel construction. Using modern manufacturing processes, the equipment and systems can be tailored to your specific space and system needs.
Call a Met-Chem representative for any of your filtration or wastewater treatment needs; Phone: 216-881-7900 or e-mail: info@metchem.com
And check out Met-Chem's NEW Website! >>
Friday, March 28, 2014
What is a Centrifugal Dryer?
Special Centrifugal Dryers features
- Polypropylene liner for corrosive materials
- Stainless Steel Construction
- Automatic lid opening and closing
- Special Sizes
Tuesday, March 25, 2014
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:
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 .
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:
- Generate less wastewater by better controlling manufacturing processes.
- 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
- 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
Monday, March 10, 2014
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
Thursday, March 6, 2014
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).
Thursday, February 20, 2014
Yarn Fibers
Thank you to Murray Fabrics for Providing this Yarn Fiber Chart!
Murray Fabrics knits tubing out of a wide variety of yarns to fit each customer's individual needs. The different fibers can be used for corrosive situations whether you are dealing with chemicals, extreme temperatures, or fire safety, as well as simple filtration.Fabric Type | Characteristics | |
| Polypropylene | Offers good tensile strength and abrasion resistance. They perform well in organic and mineral acids, solvents and alkalies. Polypropylene is attacked by nitric and chlorosulphonic acids, sodium and potassium hydroxide at high temperatures and concentrations. pH range: 2-12 Temperature: up to 190° F | |
| Polyester | Offers good resistance to most acids, oxidizing agents and organic solvents. Concentrated sulfuric and nitric acids are the exception. Polyesters are dissolved by alkalies at high concentrations. pH range: 2-9 Temperature: up to 325° F | |
| Nylon | Good tensile strength and alkali resistance but is degraded by mineral acids and oxidizing agents. This reaction is accelerated at high concentrations and temperatures. pH range: 2-8 Temperature: up to 250° F | |
| Cotton | Good abrasion resistance and mechanical strength. It is, however, subject to rot, mildew and shrinkage. pH range: 3-10 Temperature: up to 225° F | |
| Acrylic | The resistance of acrylic fibers is excellent in organic solvents, good in oxidizing agents, minerals and organic acids and fair in alkali. Will dissolve in sulfuric acid concentrations. pH range: 4-5 *Subject to other variables Temperature: 260 to 280°F / 125 to 135°C | |
| Nomex* | Resist attack by mild acids, mild alkalies and most hydrocarbons. Resistance to sulfur oxides above the acid dew point at temperatures above 300°F is better than polyester. Flex resistance is excellent. pH range: 2 - 12 Temperature: up to 425°F | |
| Kevlar* |
Kevlar (aramid yarn) is chemically stable under a wide variety of exposure conditions; however, certain strong acids and bases can cause degradation, particularly over long periods of time and at elevated temperatures.
pH range: 5-7
Temperature: Max operating temp 300-500°F / 149-260°C (Does not melt until over 800°F / 427°C) | |
Stock Yarns: cotton, polyester, polypropylene, nylon, acrylic
Special Order Yarns: We can provide Kevlar, Nomex, flame retardant, polyester/cotton blend.
Quantity: Tubing is sold by the pound and is measured by flat width and stretch.
Wednesday, November 13, 2013
Attapulgite Clay Storage
I've been running across a lot of information on attapulgite clay and the proper storage of said clay. Clays are hydroscopic, so it is important to store them in a climate controlled environment. Clay should be packaged in a way that ensures the clay does not absorb moisture during transit or during short storage periods.
For on-site inventory, it's recommended to limit storage to 6 months for standard products and three months for specialty low moisture clays. Also try not to freeze and thaw the clay.
Care should be taken not to store the clay next to chemicals giving off evaporating compounds, as the clay readily absorbs certain vapors.
Monday, October 28, 2013
Filter Resources Page
Below are some links to common filters:
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