Lint interceptors are used in non-private establishments to remove excessive amounts of lint and silt that may interfere with the proper drainage and treatment of waste water. Local plumbing codes generally require the installation of a lint interceptor where there is a sufficient amount of waste material. Typical applications include commercial /institutional laundromats and dry-cleaners. The waste discharge from these facilities usually contain high quantities of lint, silt, dissolved and suspended solids, as well as detergents.
Both UFC and IFC Plumbing Codes require the interceptor be equipped with a debris screen, wire basket or similar device, removable for cleaning, that prevents string, rags, buttons and other materials ½ inch (12.7 mm) or larger from entering the public sewer system.
The purpose of the lint interceptor is to intercept the liquid lint/silt laden wastewater and retain it for a sufficient amount of time, which allows for cool-down, thus promoting separation and fall-out of the lint/silt.
A lint interceptor, or commonly referred to as a "lint trap", is typically located outside of the building and buried below grade. The principle advantage is the cooling effect obtained from the earth. The buried interceptor is typically constructed of precast concrete providing years of continuous service. The interceptor contains several compartments where the lint will coagulate and float to the surface and heavier solids will sink to the bottom. The discharging effluent comprises of the clearer water between these layers.
Interceptor design Considerations
One of the most important features for the successful operation of the lint interceptor is the maintenance program. Regardless of the size or design, an interceptor is only as good as its maintenance program. For this reason, most plumbing codes require the interceptor be installed and located so that it will be easily accessible for inspection, cleaning and removal of intercepted waste products.
There should be an adequate number of manholes to permit access for cleaning all areas of the interceptor. A manhole should be located near the inlet and the outlet. The manhole should not be less than 20" in the least dimension. All manholes should extend to grade. The interceptor should be located near the source of the wastewater for the protection of the piping system. The lint interceptor should be buried so as to intercept the building sewer. Inlet and outlet piping shall be a minimum of 4" or the size of the building sewer, whichever is greater. Most jurisdictions require a sampling well on the discharging side of the interceptor so that an inspector can verify proper treatment or maintenance.
Types of Lint Interceptors
| Park® Model LTSC Lint Interceptor|| The Park® Model LTSSB Solids Interceptor|
| || |
|The Park® Model LTSC Lint Interceptor is a wastewater lint separator featuring one and two compartments, each accessible via 24” diameter manways. A reusable & removable stainless steel screen filter is contained in the effluent compartment to prevent solids from exiting into the public sewer system. All solids are detained inside the separator for removal by a waste disposal service. The separator can detain a large quantity of solid debris over extended amount of time. The Model LTSB Lint Interceptor is ideal for project applications that have no onsite maintenance personnel and are maintained on an infrequent basis.||The Park® Model LTSSB Solids Interceptor is a wastewater solids separator featuring a compact design with a single compartment accessible via a 24” diameter manway. A removable & cleanable stainless steel screen filter basket is contained within the compartment to screen and detain solids from the wastewater before exiting into the public sewer system. The solids are removed and disposed of by removing the basket filter and emptying into a solid waste receptacle. After cleaning, the screen filter is placed back into the separator and placed back into service. The Model SSB Solids interceptor is designed for project applications that have onsite maintenance personnel, who can service the unit on a routine basis.|
Lint interceptors manufactured by Park® are available in precast concrete, steel, or fiberglass construction.
The Park® LT Series Interceptor is manufactured of Class II 4500 PSI precast concrete. Precasting the concrete shell insures that all units achieve structural and physical uniformity. The units are structurally engineered for H-20 truck loading and can be buried without any need for any other structural protection. The unit is of monolithic construction at bottom and walls to insure against joint leakage.
The Park® LTS Series Interceptor is a steel unit and is recommended for application where the lint interceptor is installed in a freestanding position, i.e. in a basement or on a slab.
The Park® LTF Series Interceptor is manufactured with fiberglass or plastic and is used where lightweight construction is required
The lint interceptor should be cleaned (or pumped out) routinely to
prevent the escape of appreciable quantities of lint, silt and suspended
solids. Cleaning should be performed when the interceptor is at 75% of
lint/silt retention. The frequency of cleaning at any given
installation will vary depending on use. Pumping frequencies for
Laundromats usually range from once a month, to once every six months.