Calculate the amount of ammonium in grams that is required per electron equivalent of dichloromethane (CH2Cl2) in wastewater when subjected to aerobic biological treatment if fs = 0.35. Assume there is sufficient oxygen present, CH2Cl2 serves as both an electron donor and carbon source, and ammonia is nitrogen source.

Hint: For the cell synthesis half reaction, you may use bicarbonate anion (HCO3-) on the reactant side with the coefficients for bicarbonate and ammonium being the same.

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