Estimated steady-state compositions of supernatant liquid during sludge washing

摘要

Steady-state hydroxide, pH, carbonate and bicarbonate levels have been estimated for supernatant liquids during sludge washing and storage. These compositions were needed in order to prepare synthetic solutions for determining inhibitor requirements. The steady-state pH was plotted versus the nitrate concentration and fitted to a logarithmic expression of the form, pH = 10.23 (times) (NO(sub 3)(minus))(sup 0.0178) where (NO(sub 3)(minus)) is the concentration of nitrate in moles/liter. Similar expressions were also developed for calculating the concentrations of carbonate and bicarbonate as a function of the nitrate concentration.