Use of biogenic sulfide for ZnS precipitation

摘要: Abstract A 600 ml continuously stirred tank reactor was used to assess the performance of a zinc sulfide precipitation process using biogenic solution (the effluent sulfate-reducing bioreactor) as source. In all experiments, proportional-integral (PI) control algorithm pH and (S 2− ) concentration at desired level in precipitator. The pS (defined as: −log [S ]) were optimised chemical Na 2 S 10 −15  M (i.e. 15) found be optimal for precipitation, resulting residual 0.07 mg/l from 3 g/l Zn 2+ influent, both solutions. mean particle size ZnS precipitates 15 6.3 7.5 10.2 μm when S, respectively, indicating that sources are adequate solid–liquid separation by sedimentation. When instead used, efficiency slightly decreased terms (at 20) precipitate 10, 20). This shown attributed presence various substances (phosphate, micro-nutrients, acetate, EDTA) present effluent.