answer solid waste - DECEMBER 2014 QUESTION 7 a Oxidation...

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DECEMBER 2014 QUESTION 7 a) Oxidation process. Example, the cynide waste are oxidized and store in a slurry storage tank. Reduction process. Example, the chromate waste are reduce and store in a slurry storage tank Neutralization process. Example, the alkaline and acid waste are neutralized and stored in slurry storage tank b) The plastic contain stabilizer and other chemical which need to be removed before recycle. Recovering individual plastic resins does not yield much resin because only small amount resin use per product The cost of oil to produce petrochemical for making resin is low which the cost of virgin resin are 40% lower than the recycled resin c) Government make give and take program. The people who sent the plastic to recycle will be paid according to the weight of plastic. Provide bin for collecting plastic in house area JUNE 2014 a) Contrast of Landfill Incinerator advantage The cheapest method and the most convenient method Can reduce the amount of waste of 90% by volume and 75 % by weight disadvantage Can cause water pollution- leachate overflow to the underground water. Can cause soil contamination-the leachate contain heavy metal will devalue the soil. The small amount of pollutant contain heavy metal and acid like furan and dioxin may release to atmosphere which can cause birth defect and cancer.
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  • Summer '14
  • Neutralization, Waste, source reduction, plastic contain stabilizer, slurry storage tank

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