First application in the 1930s in the USA. Percentage of the households using disposers: USA 50%, Central America 5%, Great Britain 4%, Australia 5% (data from 1987 – today in USA up to 80%).
According to several studies, after installation of disposers, no substantial increase in cost of sludge removal in sewage disposal plants occurred. Even though the content of solid substances in waste water increases, operation of sewage disposal plants is not affected by this, since these substances are of organic origin.
Installation of disposers reduces occurrence of rodents, verminous insects and bacteria in all places, where a concentration of biological waste is common.
Noisiness of the disposer ranges from 60 to 90 dB according to the type of operation (from idle run to crushing bones). Idle run 60 dB, run with water flow 63 dB, crushing of bones with water flow 90 dB. Comparison with other kitchen appliances: mixer - blender 65 - 87 dB, vacuum cleaner 60 - 75 dB, refrigerator 47 - 67 dB.
Speed of flow in a sewerage conduit with the diameter of 20,3 cm should be about 0,21 m/s, so that no unwanted sedimentation of crushed organic material occurs.
From an ecologic perspective, represents the use of disposers, so-called waste sorting at source. Wet and dry parts of waste are separated.
Increase in water consumption in an average 4-member family by about
5,5 l / disposer per day, el. energy by 0,050 kWh / disposer per day.
Comparison of water consumption of other appliances:
MMonthly operating costs of the disposer (el. energy and water 6,10 CZK/a 4-member household per month). At the same time, costs of collection of solid household waste will decrease. Cost of collection of solid household waste grows faster than prices of water and electric energy.
Decomposing processes occurring in a septic tank are not negatively affected by installation of a disposer. Requirements of the capacity of the septic will increase by 2,7%.
Degree of organic pollution:
(100% fitting means in all households. This percentage is, of course, decreasing according to the % of fitting.)
Approximately 35 % of household waste is of organic origin and can be disposed of in disposers. This amount can be deducted from the total amount of waste produced by a household.
Disposers markedly decrease the content of wet organic material in the waste for incineration. Volume of slag will be reduced by 17 - 19%.
6 independent studies carried out in 1966 - 1984 state that the daily consumption of water of a disposer is from 3 to 6,64 l, that is 1,7 - 2,7% of water consumed in a household.
Immediate removal of biological waste prevents decomposing processes in waste baskets and thereby reduces malodor in kitchens.
They cannot feed themselves with substances dissolved in water. On the contrary, uncrushed leftovers flushed into a toilet are a great source of food for these rodents.
Tests proved that a sewerage system fitted with a disposer has more favorable conditions for water flow than sewerage without a disposer. Moreover, crushed bones or shells have a cleaning function inside the sewerage system.
Disposers of organic waste of the brand EcoMaster have very low operating costs, in an average household with 4 members it is about 4 liters of water per day (for comparison: one flushing of a toilet takes 6 liters of water). Electric energy consumption per month is similar to switching on one 100W bulb for one hour once a month. Monthly operating costs of a disposer (el. energy and water) = 6,10 CZK / a 4-member household per month.
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