Knowing which thread to choose for your sewing project is a key part of a successful outcome. Thread that is too small or weak can result in a project that falls apart; thread too wide or coarse can split or tear the fabric. Here is some guidance on choosing the correct sewing thread for your […]
Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications including packaging and labeling, textiles (e.g., ropes, thermal underwear and carpets), stationery, plastic parts and reusable containers of various types, laboratory equipment, loudspeakers, automotive components, and polymer banknotes. An addition polymer made from the monomer propylene, it is […]
Polyethylene, often referred as PE, is the most common plastic.The annual global production is around 80 million tonnes.Its primary use is in packaging (plastic bags, plastic films, geo- membranes, containers including bottles, etc.). The properties of polyethylene can be divided into mechanical, chemical, electrical, optical, and thermal properties. Mechanical properties: Polyethylene is of low strength, […]
As we know, PTFE is kind of the superman in filter materials choosing due to its marvelous chemical properties. Moreover, with the over rising of water and energy issue, PTFE has established its solid reputation for its numerous applications. PTFE’s advantages at a glance: Property Value Density 2200 kg/m3 Glass temperature 388 K Melting point 600 K Thermal […]
There are several filtration methods : simple or gravity, hot and vacuum filtrations. The selection of the appropriate method is typically dictated by the nature of the experimental situation. The answers to each these questions help dictate what type of set up is required. Are you collecting the solid or the filtrate (solution) ? If […]
Backwashing of the filters is the single most important operation in the maintenance of the filters. If the filter is not backwashed effectively, problems may occur that may be impossible to correct without totally replacing the filter media. These problems could be caused by improper backwashing procedures: Mud Balls Mud balls are formed by the […]
When a filter is subjected to rapid changes in flow rate, the turbidity of the effluent may be affected, and the dirtier the filter media, the greater the effect. When a plant flow changes, the filter flow also has to change to produce the water needed. If an increase is necessary, the flow should, if […]
There are three major types of filter problems. They can be caused by chemical treatment before the filter, control of filter flow rate, and backwashing of filters. Chemical Addition Before Filter Coagulation and flocculation stages of the water treatment must be monitored continuously. Adjustments in the amount of coagulant added must be made frequently to […]
When water passes through a filter, the floc sometimes is torn apart into smaller particles that penetrate deeply into the filter media, causing premature turbidity breakthrough. This requires more frequent filter backwashing of the filter and large volumes of backwash water to be able to remove the floc that has penetrated deeply into the filter […]
When filtration is started after backwash, the filtered water should be wasted until the turbidity in the effluent meets standards. Depending on the type of filter, this may last from two to 20 minutes. This wasting is needed as some suspended material remains in the filter media following the backwash. The media needs to become […]
