Investigation on extracellular polymeric substances, sludge flocs morphology, bound water release and dewatering performance of sewage sludge under pretreatment with modified phosphogypsum
| Autor: | Ping Ning, Haijun Gao, Longgui Xie, Guo Zhiying, Liping Ma, Nanqi Ren, Quxiu Dai |
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| Rok vydání: | 2018 |
| Předmět: |
Environmental Engineering
0208 environmental biotechnology Phosphogypsum 02 engineering and technology 010501 environmental sciences 01 natural sciences Calcium Sulfate Waste Disposal Fluid law.invention Extracellular polymeric substance Biopolymers law medicine Bound water Dehydration Desiccation Waste Management and Disposal Filtration 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering Sewage Chemistry Ecological Modeling Flocculation Water Phosphorus medicine.disease Pollution Dewatering 020801 environmental engineering Chemical engineering Composition (visual arts) Sludge |
| Zdroj: | Water research. 142 |
| ISSN: | 1879-2448 |
| Popis: | Modified phosphogypsum (MPG) was developed to improve dewaterability of sewage sludge, and dewatering performance, properties of treated sludge, composition and morphology distribution of EPS, dynamic analysis and multiple regression model on bound water release were investigated. The results showed that addition of MPG caused extracellular polymeric substances (EPS) disintegration through charge neutralization. Destruction of EPS promoted the formation of larger sludge flocs and the release of bound water into supernatant. Simultaneously, content of organics with molecular weight between 1000 and 7000 Da in soluble EPS (SB-EPS) increased with increasing of EPS dissolved into the liquid phase. Besides, about 8.8 kg•kg−1DS of bound water was released after pretreatment with 40%DS MPG dosage. Additionally, a multiple linear regression model for bound water release was established, showing that lower loosely bond EPS (LB-EPS) content and specific resistance of filtration (SRF) may improve dehydration performance, and larger sludge flocs may be beneficial for sludge dewatering. |
| Databáze: | OpenAIRE |
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