A meta-analysis of metal biosorption by suspended bacteria from three phyla

Biosorption of heavy metals by bacterial biomass has been the subject significant research interest in last decades due to its efficiency, relatively low cost and minimal negative effects for surrounding environment. In this meta-analysis, biosorption efficiencies different strains Cu(II), Cd(II), Zn(II), Cr(III), Mn(II), Pb(II) Ni(II) were evaluated. Optimum conditions process such as initial metal concentration, temperature, pH, contact time, type, dosage phyla, evaluated each metal. According results, removal follows: Cd(II) > Cr(III) Zn(II) Cu(II) Mn(II). Firmicute phyla showed highest overall (living dead) efficiency metals. Living Proteobacteria had best performance. was significantly more efficient than dead biomass. The maximum achieved at pH values between 6 7.5. High temperatures (>35 °C) reduced increased ions. non-essential occurred with short times (<2 h). Essential Zn Cu efficiently removed long durations (>24 mean capacity 71.26 125.88 mg g?1. No publication bias existed according Egger’s Begg’s test results.