Application of integrated chemical-physical processes modelling to aeration treatment of anaerobic digester liquors

摘要

A three phase(aqueous/solid/gas) mixed weak acid/base kinetic model developed by Musvoto et al. Is applied to simulate the physical and chemical processes that occur on aeration of anaerobic digester liquors. Included in the model are the kinetic reactions for (i) weak acid/base dissociations(water, carbonate, ammonium, phosphate, and short-chain fatty acids), (ii) precipitation for struvite, new beryite, amorphous calcium phosphate, calcium and magnesium carbonate, (iii) ion pair formation and (iv) stripping of CO_2 and NH_3 gases. To generate data for model application, batch aeration tests were conducted on two anaerobic digester liquors from (i) a spent wine upflow anaerobic sludge bed(USAB) digester and (ii) a sewage sludge anaerobic digester.