Pneumatic refuse collection system will be trial and tested for islandwide implementation

Pneumatic refuse collection system is becoming popular in developed countries due to its advantage. This system has been in place overseas since the 1960s. However, Singapore has been using the manual method of collecting refuse for more than 40 years. The current method of manual tipping of chute bins to collect refuse are not very efficient. Open chute bins emit foul stench during conveyance of refuse to bin centers. Improvements have to be made.
This project is a collaboration between NUS and a local waste management company, SembWaste. This project did not involve experiments or testing. The purpose of this dissertation attempts to provide an understanding on the feasibility and operations of pneumatic refuse collection system. One of the main areas of study is on SembWaste Enviro-EZ system. Calculations show that sufficient vacuum pressure has to be created in Enviro-EZ before every suction process begins. The required pressure and air velocity to convey refuse is estimated by using simple bulk solids pneumatic conveying system formulas. Pressure losses of free air were calculated using Bernoulli’s Equation. BH350T fan was selected as it fits the power and pressure requirements.
The designs of refuse hopper and refuse container were also discussed. Problems posed by the current system and design considerations were presented. The designs aim to provide user-friendly features to users and cleaning operators. To increase reliability of the system, it is recommended that air flow and prototype experiments be conducted for successful implementation of Enviro-EZ system.

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