Trash screens are fences that filter debris in streams, rivers, and lakes. They come in different designs and materials, such as metal or plastic. Screens need regular cleaning to avoid blocking the waterway. External screens are common in streams, while internal screens are used in drainage systems. Water-powered and turbine-driven screens are more complex and automatically remove waste.
A trash screen is a type of fence used to filter debris in the path of a stream. This is a handy tool for keeping streams, rivers and lakes free of trash and unwanted elements. The basic design of all refuse screens is similar, but the internal, external and turbine screens meet different needs. Screens can also be made from different materials.
A basic stream waste screen is made of any type of mesh material that allows water to pass through but retains large pieces of debris. A trash screen is usually made of the same materials as many fences, such as metal or plastic. Depending on the waterway and the amount of pollution it passes through, screens often need to be cleaned on a regular basis to avoid blocking the waterway.
A trash filter is normally constructed of non-corrosive metal wire. Usually, it’s a section of aluminum fence. The size of the openings can be controlled by the type of fence used, such as a backyard fence with larger holes or a wire mesh fence with smaller openings. In addition to metal fences, plastic fences can also be used, such as those used for snow fences. This method is less expensive than metal but runs the risk of deteriorating more quickly due to constant exposure to water and pressure.
The most common type of trash can is the external screen. These screens are placed in the middle of a stream, usually at its narrowest point. The fence is anchored by metal posts that go deep into the ground. The screen spans the width of the waterway and normally goes below the waterline as well. Ideally, any bits of debris floating along this path will be captured by the screen to avoid further contamination.
Internal screens are popular for drainage systems. When it rains, most cities have water run off to the street and this water is eventually filtered into a nearby stream. Many communities place screens within the drainage system to catch any debris that has passed from street level to prevent it from reaching the waterway.
A more complex type of waste screener is the water-powered and turbine-driven waste screener. This self-contained piece of machinery has a water wheel that is turned by the flow of the stream. This wheel powers a turbine that uses a screen to sweep water and automatically remove waste.
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