The pH increase of an acid mine water

Apply 1 m/s as flow velocity so that the total contact time in the channel is 500 seconds. The modeling should be done as Id transport model with 10 cells (dispersivity 0.1 m) and last over 750 seconds. Also take into account the contact with the atmosphere. Therefore, ran the model once with a C02 partial pressure of 0.03 Vol% and a second time with 1 Vol%, both times assuming an oxygen partial pressure of 21 Vol% 02. The latter case corresponds rather to a closed carbonate channel. 

Illustrate the results of the model by presenting the water characteristics over the whole length of the channel at the end of the modeling (pH value, SI calcite, Ca, Fe, C, S042, CaS04°). Additionally indicate the amounts of calcite dissolved and of gypsum and iron hydroxide precipitated. 

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