Multifractal scaling of crack images from pyroligneous acid dried sludge

► We use pyroligneous acid to treat the sludge by natural way. ► The same can be converted into bio-food or manure to the vegetation. ► This is not only a big advantage but also big remedy for waste management. ► Especially for the tanneries which are not using chrome method in the process of tanning. ► Fractal and multifractal analysis characterized the sludge surface, quantify the fracture and investigate the roughness.