Problem- An anaerobic digester is a biological reactor often used to treat wastewater sludges-liquids containing from 0.5% to 5.0% solids. If a digester has a bisulfide [HS-] concentration of 30 mg/L and a pH of 7.7, what is the partial pressure of hydrogen sulfide in the digester gas? Hint: Calculate the H2S(aq) concentration and then use Henry's law. pKa=7.1 for and Henry's law constant for hydrogen sulfide: 0.102 mol/(L•atm). Atomic mass of S: 32 g/mol.
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