| 酸碱与农业生物质骨料对污泥脱水效能的影响 |
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| 引用本文： | 郭绍东,梁恒,瞿芳术,朱雷,汪恂,李圭白.酸碱与农业生物质骨料对污泥脱水效能的影响[J].哈尔滨工业大学学报,2019,51(2):16-21. |
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| 作者姓名： | 郭绍东 梁恒 瞿芳术 朱雷 汪恂 李圭白 |
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| 作者单位： | 武汉科技大学城市建设学院,武汉,430000;城市水资源与水环境国家重点实验室(哈尔滨工业大学),哈尔滨,150090 |
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| 基金项目： | 国家重点研发计划项目(2016YFC0305404) |
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| 摘 要： | 为改善污泥脱水性能,在不同pH条件下考察3种农业生物质即小麦秸秆粉末(WSP)、玉米秸秆粉末(CSP)及稻壳粉末(RHP)对污泥脱水的影响.采用毛细吸吮时间(CST,tCS)及污泥比阻(SRF,FSR)等表征污泥脱水性能,用粒径和Zeta电位考察污泥性质的变化,通过离心液浊度,胞外聚合物质(EPS)含量、束缚水和泥饼结构来解释协同作用机制.实验结果显示,当pH控制在3时,污泥脱水效果最好,深度脱水后泥饼含水率下降到61. 5%;分别投加WSP、CSP及RHP时,污泥FSR分别下降到7. 32×10~8,7. 41×10~8及8. 29×10~8s2/g. pH小于2或pH从8升高到11时tCS和FSR都显著升高;在投加0. 75 g/g DS WSP、CSP及RHP后,也不能改善污泥脱水效果. pH低于2或者碱性条件使污泥释放更多有机物质和浊度,污泥脱水效果恶化严重.酸及生物质改善污泥脱水性能的机理为酸(pH=3)促进污泥分解EPS释放束缚水,而生物质作为骨料提供水分孔道.
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| 关 键 词： | 污泥脱水 农业生物质 酸碱条件 骨料 |
| 收稿时间： | 2017/10/18 0:00:00 |
Effects of acid and alkali and agricultural biomass as skeleton builder on sludge dewaterability |
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| GUO Shaodong,LIANG Heng,QU Fangshu,ZHU Lei,WANG Xun and LI Guibai.Effects of acid and alkali and agricultural biomass as skeleton builder on sludge dewaterability[J].Journal of Harbin Institute of Technology,2019,51(2):16-21. |
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| Authors: | GUO Shaodong LIANG Heng QU Fangshu ZHU Lei WANG Xun and LI Guibai |
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| Affiliation: | Urban Construction Institute, Wuhan University of Science and Technology, Wuhan 430000, China,State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology, Harbin 150090, China,State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology, Harbin 150090, China,Urban Construction Institute, Wuhan University of Science and Technology, Wuhan 430000, China,Urban Construction Institute, Wuhan University of Science and Technology, Wuhan 430000, China and State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology, Harbin 150090, China |
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| Abstract: | Three agricultural biomasses, wheat stalk powder (WSP), corn stalk powder (CSP), and rice husk powder (RHP) were used to enhance sludge dewaterability at different pH values. Capillary suction time (tCS), filtration resistance (SRF, FSR), etc. were used to characterize sludge dewatering performance. Sludge particle size and Zeta potential were investigated to reflect the changes of sludge properties. Turbidity, extracellular polymeric substance (EPS), bound water, and sludge cake structure were used to explain the mechanism of synergistic effect. The results showed that the optimum sludge dewatering performance was achieved when the pH value was 3 with a dewatered sludge cake moisture content of 61.5% under 2 MPa pressure. When WSP, CSP, and RHP were dosed separately, FSR decreased to 7.32×108, 7.41×108, and 8.29×108 s2/g, respectively. Sludge tCS and FSR increased remarkably with pH values lower than 2 or ranging from 8 to 11, and 0.75 g/g DS biomass could not improve sludge dewaterability, especially under strong alkali conditions. Strong acidity and alkali made sludge release more turbidity and organic matter which would block sludge cake and filter medium. The mechanism of acid and biomass improving the sludge dewatering performance of sludge is that acid (pH=3) promotes sludge extracellular polymerization (EPS) decomposition, while biomass provides water pore channels for dewatering as skeleton builder. |
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| Keywords: | sludge dewatering agriculture biomass acid and alkali skeleton builder |
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