Experimental study on characteristics of consolidation of sludge

Abstract

Sludge dewatering has become an important issue in the sewage treatment industry. The essence of mechanical dewatering is the consolidation and drainage of sludge. Therefore, it is of great significance to study the consolidation characteristics of sludge to improve the dehydration efficiency. Consolidation tests were carried out on the sludge treated with FeCl3 and Fenton reagent, and the consolidation and permeability characteristics of the treated sludge were studied. The sludge shows ultra-high compressibility. The consolidation coefficient of the untreated sludge is 10−7∼10−6cm2/s. After adding 15% FeCl3 (relative to sludge dry weight), the consolidation coefficient of the sludge increased by 5∼8 times, and reached 10−6∼10−5cm2/s after Fenton reaction treatment. The untreated sludge has obvious time deformation characteristics.