| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 679284 | Bioresource Technology | 2016 | 6 Pages |
Abstract
Rice husk biochar modified by FeCl3 (MRB-Fe) was used to enhance sludge dewaterability in this study. MRB-Fe preparation conditions and dosage were optimized. Mechanisms of MRB-Fe improving sludge dewaterability were investigated. The optimal modification conditions were: FeCl3 concentration, 3Â mol/L; ultrasound time, 1Â h. The optimal MRB-Fe dosage was 60% DS. Compared with raw sludge, the sludge specific resistance to filtration (SRF) decreased by 97.9%, the moisture content of sludge cake decreased from 96.7% to 77.9% for 6Â min dewatering through vacuum filtration under 0.03Â MPa, the SV30% decreased from 96% to 60%, and the net sludge solids yield (YN) increased by 28 times. Positive charge from iron species on MRB-Fe surface counteracted negative charge of sludge flocs to promote sludge settleability and dewaterability. Meanwhile, MRB-Fe kept a certain skeleton structure in sludge cake, making the moisture pass through easily. Using MRB-Fe, therefore, for sludge conditioning and dewatering is promising.
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Authors
Yan Wu, Panyue Zhang, Haibo Zhang, Guangming Zeng, Jianbo Liu, Jie Ye, Wei Fang, Xiying Gou,