Enhancement of dewatering performance of digested paper mill sludge by chemical pretreatment

International Conference on Water Resource and Environment 2016

地球科学;生态环境科学

Lin, Y.Q.^1 ; Zeng, C.^1,2 ; Wu, H.H.^1 ; Zeng, B.X.^1

College of Natural Resources and Environment, South China Agricultural University, Guangzhou

510640, China^1

State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai

200092, China^2

关键词: Average particle size;    Chemical pre-treatment;    De-watering efficiencies;    Dewatering performance;    Dewatering properties;    Extracellular polymeric substances;    Sludge dewaterability;    Solid liquid separation;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/39/1/012069/pdf
DOI  :  10.1088/1755-1315/39/1/012069

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The wide application of anaerobic digestion (AD) for waste sludge results in a huge amount of digested sludge, while the appropriate reuse of digested sludge depends on effective solid-liquid separation. Thus, chemical (acid/alkali) pretreatment effects on dewaterability of digested paper mill sludge (DPMS) for better downstream reuse based on enhanced solid- liquid separation were investigated in this research. The dewatering properties of paper mill sludge (PMS) were also investigated to elucidate the impact of AD on sludge dewaterability. The results indicated that a higher DPMS dewaterability was noted with acid pretreatment (pH5). A 41.37% moisture content and 74.41% dewatering efficiency were determined for DPMS after acid (pH5) pretreatment within 25 min. In addition, a 7.13 mg•g-1 VSS of extracellular polymeric substances (EPS) and 101.50 μm of average particle size were observed. It was also observed that both EPS concentrations and particle sizes were key parameters influencing DPMS dewaterability. Lower EPS concentrations with larger average particle sizes contributed to enhanced sludge dewaterability. Moreover, dewaterability of PMS was higher than that of DPMS, which illustrated that AD would decrease the sludge dewaterability.