FAQ

  1. How can organic municipal wastes be collected?
  2. Can the biogas generated during the sewage treatment process be employed for off-site use?
  3. Can all the organic materials in a digester be broken down by anaerobic digestion?
  4. What is the best temperature for anaerobic digestion?
1) How can organic municipal wastes be collected?
Ans: In some countries, waste separation is done at homes with household waste divided into metal, glass, paper, organic waste, etc. Different waste collectors will pick up the corresponding waste on different days, including organic municipal wastes. In Hong Kong, waste separation at home is not implemented but there have been some pilot programmes to separate the "wet waste" from the "dry waste".
   
2) Can the biogas generated during the sewage treatment process be employed for off-site use?
Ans: Usually no, because the biogas is often only sufficient to meet part of the energy needs of the sewage treatment plant itself.
   
3) Can all the organic materials in a digester be broken down by anaerobic digestion?
Ans: No, materials with high lignin content are not broken down under anaerobic conditions. They require an aerobic process.
   
4) What is the best temperature for anaerobic digestion?
Ans: Anaerobic digestion occurs at different temperatures. The most rapid digestion activities occur under mesophilic and thermophilic temperature conditions with temperatures of about 35oC and 55oC respectively.
   
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