Rabu, 5 Ogos 2009
Waste Produced in Malaysia
According to Global Environment Centre (GEC), solid waste is one of the three major environmental problems in Malaysia. It plays a significant role in the ability of Nature to sustain life within its capacity. Currently, over 23,000 tonnes of waste is produced each day in Malaysia. However, this amount is expected to rise to 30,000 tonnes by the year 2020. The amount of waste generated continues to increase due to the increasing population and development, and only less than 5% of the waste is being recycled.
Nowadays, population of Malaysia is growth rapidly as well as the growth of economic of the country. This is then due to the increased number in producing of municipal solid waste. According to Mohd Suffian Yusuf, it is estimated about 19,000 tonne of solid waste produced in Peninsular Malaysia per day and averagely the solid waste produced is 0.85 kg / capita / day. Moreover, it is averagely about 76% of the waste is collected and 5% of the waste is recycled, and disposal.
Nazri Yahya mentioned that, it is predicted that generation of solid waste expected to reach 30,000 tones per day in 2020. Likewise, Ninth Malaysia Plan estimated about 45% of the waste is made up of food waste, 24% of plastic, 7% is paper, 6% of iron and glass and others made of the rest.
Therefore, the environmental problem can be reduced by inventing alternative method based on 4 R’s concept (recycle, reuse, reduce and refuse). Nowadays, the ecological trend aims at limiting the use of natural raw material and this increases the interest in the use of alternative materials, or waste, coming from industrial activities, which, in this way, gain a non negligible economic, energetic and environmental value. Take for example, concentration on 6% of iron and glass waste, which is the lowest portion of waste produced, but it still can contribute to the increases percentage of recycling materials as promoted by the Ninth Malaysia plan towards ear 2020, which is recycling up to 22%. This is to solve the problem of lack places of landfilling and also leachate problem.
There is studied done by Wang Her-Yung, (2009, Waste Management, Vol 29, pp. 335-341), the concrete properties due to the used of LCD glass sand. He encountered that the LCD glass function similar to fine aggregates in producing concrete properties. He also proved that concrete properties due to the effects of LCD is strengthen that natural concrete.
Therefore, this idea can be one of the alternative way to support waste management concept, which is by replacing LCD glass to recycle glass to be used in producing a concrete. This can support 2R's recycle and reduce the amount of the glass waste.
However, there should be experimental to be set up in order to study and analyze the properties of concrete by using glass as the sand.