WASTE BIOGAS RESIDUAL SLURRY AS AN ADSORBENT FOR THE REMOVAL OF PB(II) FROM AQUEOUS-SOLUTION AND RADIATOR MANUFACTURING-INDUSTRY WASTE-WATER

Waste biogas residual slurry (BRS) was used for the adsorption of Pb(I I) from aqueous solution, over a range of initial metal ion concentrat ions (20-100 mg litre(-1)), agitation times (5-70 min), adsorbent dose s (0.4-5.0 g litre(-1)) and initial pH values (1.5-6.0). The amount of Pb(II) adsorbed (mg g(-1) of adsorbent) increased with increases in t he initial concentration of Pb(II). The applicability of the Lagergren rate equation was also investigated. The process of uptake of Pb(II) by BRS followed the Langmuir isotherm model and the adsorption capacit y was 28 mg g(-1). An almost quantitative removal of Pb(II) from a sol ution (50 ml) containing 100 mg litre(-1) Pb(II) by 5.0 g litre(-1) ad sorbent was observed at an initial pH of 2.5. Application of BRS for t he effective removal of Pb(II) from radiator manufacturing industry wa stewater has been demonstrated.