Dewatering performance of sewage sludge under pretreatment with modified corn-core powder
Autor: | Zhiying Guo, Lichun Wang, Quxiu Dai, Liping Ma, Ran Ao, Jing Yang |
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Rok vydání: | 2019 |
Předmět: |
Environmental Engineering
010504 meteorology & atmospheric sciences 010501 environmental sciences Waste Disposal Fluid Zea mays 01 natural sciences law.invention chemistry.chemical_compound Extracellular polymeric substance law medicine Environmental Chemistry Dehydration Waste Management and Disposal Water content Filtration 0105 earth and related environmental sciences Sewage Chemistry Total dissolved solids Pulp and paper industry medicine.disease Pollution Dewatering Sodium hydroxide Powders Sludge |
Zdroj: | Science of The Total Environment. 684:402-412 |
ISSN: | 0048-9697 |
DOI: | 10.1016/j.scitotenv.2019.05.366 |
Popis: | The water retained inside the sludge flocs is the bottleneck for the dehydration of sewage sludge, which hindered the following treatment. In this study, corn core powder was modified (MCCP) using sodium hydroxide (NaOH) and cationic surfactant cetyltrimethylammonium bromide (CTMAB) to break the structure of extracellular polymeric substances (EPS) and cell membrane for enhancing the dewaterability of sewage sludge. The dewatering performance, the properties of the treated sludge, the composition and distribution of EPS were investigated to discuss the dewatering mechanism of sludge. Adding 20% DS (mass of dry solids in sludge) of MCCP reduced the moisture content (MC) and the specific resistance of filtration (SRF) of the sludge by 40% and 55%, respectively. Then, correlation analyses were performed between dewatering indices of sludge and sludge properties. A multiple linear regression model was established which indicated the relationship between MC and the key factors reflecting sludge dewaterability, demonstrating that larger particle size of sludge flocs and more total dissolved solids in filtrate may be propitious to reduce content of bound water in sludge. |
Databáze: | OpenAIRE |
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