Catalytic Activated Carbons for Dechlorination and Dechloramination

Do they really work and, if so, how?

  1. Which is not a form of ’free chlorine’ in water?
    1. HOCl
    2. OCl-
    3. Cl2
    4. Cl-
  2. What is the common term for chlorine in a chloramine compound?
    1. Combined chlorine
    2. Free chlorine
    3. Total chlorine
    4. Residual chlorine
  3. What is the advantage of chloramines over chlorine for disinfection?
    1. Chloramines have stronger oxidizing action.
    2. Chloramines produce fewer disinfection byproducts.
    3. Chloramines are less expensive than chlorine.
    4. Chloramines do not have the same objectionable taste as chlorine.
  4. By which mechanism does activated carbon remove chlorine from water?
    1. Size exclusion by pores
    2. Adsorption to active sites
    3. Absorption by pores
    4. Reaction with active sites
  5. Why is activated carbon less effective in removing chloramines than free chlorine?
    1. Chloramines are larger molecules.
    2. Chloramines are weaker oxidants.
    3. Chloramines don’t adsorb.
    4. Chloramines are more reactive.
  6. Why is finer mesh activated carbon likely to be better at removing chloramines than a coarser mesh?
    1. Finer mesh can trap smaller molecules.
    2. Less carbon can be used.
    3. More surface area available
    4. Less acidic residue
  7. According to US Patent 4,624,937, which result of pyrolysis is correlated with higher chloramines removal capacity?
    1. Increased nitrogen content of the carbon
    2. Decreased pore size of the carbon
    3. Decreased acid oxide residue in the carbon
    4. Finer mesh size of the carbon
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