Adsorption of heavy metals on sonicated activated sludge

Adsorption and toxicity of heavy metals on activated sludge

The adsorption of Cu, Cd, Ni, Zn, and Cr from synthetic solutions on powdered activated carbon (PAC), activated sludge, and dried sludge were investigated under laboratory conditions to assess its ability to remove heavy metals. The adsorption efficiency increased rapidly within the first 30 min and then slowed down as it approached a steady state after 5 h of contact time. The results showed t...

Adsorption of heavy metals by EPS of activated sludge.

Extracellular polymeric substances (EPSs) were extracted by high-speed centrifugation at 20,000 G for 30 min from an activated sludge treating municipal wastewater. Each gram of sludge, as measured in volatile suspended solids (VSS), contained 7.3 mg of EPS, including 6.5 mg of protein (EPSp) and 0.8 mg of carbohydrate (EPSc). The EPSp had a mean MW of 2.0 x 105; about 18% of EPSp had MW over 5...

Inhibition of activated sludge respiration by heavy metals

Inhibition of the respiration microbial activity in the activated sludge caused by heavy metal concentrations (Cr, Cd, Cu and Ni) was studied by means of respirometric method using Strathtox respirometer (Strathkelvin Glasgow).The studied sludge samples were obtained from the two waste water treatment plants with different types of pollution (municipal waste water and domestic waste water). Key...

Nitrification Inhibition by Heavy Metals in Activated Sludge Process

Nitrification is the most sensitive part in the biologic nutrient removal of wastewaters, since the growth rate of nitrifying microorganisms is very lower and strongly dependent on temperature, substrate concentration, oxygen content, pH, and the presence of inhibiting components. This review addresses the nitrification inhibition by heavy metals. This inhibition can be quantified by different ...

Adsorption of Cd(II) by Dried Activated Sludge