![]() Usually, there is a partial rubber closure, known as a splashguard, on the top of the disposal unit to prevent food waste from flying back up out of the grinding chamber. ![]() Sharp cutting edges in the grind ring break down the waste until it is small enough to pass through openings in the ring, and sometimes it goes through a third stage where an Undercutter Disk further chops the food up, whereupon it is flushed down the drain. Two swiveling and sometimes also two fixed metal impellers and mounted on top of the plate near the edge then fling the food waste against the grind ring repeatedly. Inside the grinding chamber there is a rotating metal turntable onto which the food waste drops. Universal motors, also known as series-wound motors, rotate at higher speeds, have high starting torque, and are usually lighter, but are noisier than induction motors, partially due to the higher speeds and partially because the commutator brushes rub on the slotted commutator. The added weight and size of induction motors may be of concern, depending on the available installation space and construction of the sink bowl. Induction motors rotate at 1,400–2,800 rpm and have a range of starting torques, depending on the method of starting used. Operation Ī high- torque, insulated electric motor, usually rated at 250–750 W ( 1⁄ 3–1 hp) for a domestic unit, spins a circular turntable mounted horizontally above it. Modern wastewater plants are effective at processing organic solids into fertilizer products (known as biosolids), with advanced facilities also capturing methane for energy production. The premise behind the proper use of a disposer is to effectively regard food scraps as liquid (averaging 70% water, like human waste), and use existing infrastructure (underground sewers and wastewater treatment plants) for its management. Burned in waste-to-energy facilities, the high water-content of food scraps means that their heating and burning consumes more energy than it generates buried in landfills, food scraps decompose and generate methane gas, a greenhouse gas that contributes to climate change. Rationale įood scraps range from 10% to 20% of household waste, and are a problematic component of municipal waste, creating public health, sanitation and environmental problems at each step, beginning with internal storage and followed by truck-based collection. Some local authorities in Britain subsidize the purchase of garbage disposal units in order to reduce the amount of waste going to landfill. In Sweden, some municipalities encourage the installation of disposers in order to increase the production of biogas. In the United States, some 50% of homes had disposal units as of 2009, compared with only 6% in the United Kingdom and 3% in Canada. In 2008, the city of Raleigh, North Carolina attempted a ban on the replacement and installation of garbage disposers, which also extended to outlying towns sharing the city's municipal sewage system, but rescinded the ban one month later. After a 21-month study with the NYC Department of Environmental Protection, the ban was rescinded in 1997 by local law 1997/071, which amended section 24-518.1, NYC Administrative Code. For many years, garbage disposers were illegal in New York City because of a perceived threat of damage to the city's sewer system. Many localities in the United States prohibited the use of disposers. InSinkErator spent considerable effort, and was highly successful in convincing many localities to rescind these prohibitions. In many cities in the United States in the 1930s and the 1940s, the municipal sewage system had regulations prohibiting placing food waste (garbage) into the system. Hammes' claim is disputed, as General Electric introduced a garbage disposal unit in 1935, known as the Disposall. His InSinkErator company put his disposer on the market in 1940. He applied for a patent in 1933 that was issued in 1935. ![]() Hammes, an architect working in Racine, Wisconsin. The garbage disposal unit was invented in 1927 by John W. The disposal unit shreds food waste into pieces small enough-generally less than 2 mm (0.079 in) in diameter-to pass through plumbing. A garbage disposal unit installed under a kitchen sink.Ī garbage disposal unit (also known as a waste disposal unit, garbage disposer, garburator etc.) is a device, usually electrically powered, installed under a kitchen sink between the sink's drain and the trap. ![]()
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