Abstract:The combined alkaline and thermal treatment was used to disintegrate the dewatered sludge. The treatment process was studied and a kinetics model was built. The results showed that alkaline application can significantly promote the sludge disintegration compared with the only thermal treatment, and NaOH has higher efficiency than Ca(OH)2. The best parameters of combined alkaline and thermal treatment are 140℃, 90minutes, and the alkaline dose of 0.25g/g total solid (TS). Under this condition, the soluble chemical oxygen demand (SCOD) has an increase of 41.26% or 198% and the mass reduction ratio can reach 50% and 57% respectively with the assistance of Ca(OH)2 or NaOH. The relationship of the SCOD variation and the treatment temperature (T), duration (t) and NaOH dosage (A) can be described with an exponential model: SCODNa=10178.17[ T ]0.43 [ A ]0.59 t 0.24.
李洋洋, 金宜英, 李欢, 聂永丰. 碱热联合破解污泥效果及动力学研究[J]. 中国环境科学, 2010, 30(9): 1230-1234.
LI Yang-Yang, JIN Yi-Ying, LI Huan, NIE Yong-Feng. Effects and kinetics model of combined alkaline and thermal sludge treatment. CHINA ENVIRONMENTAL SCIENCECE, 2010, 30(9): 1230-1234.