CaO低温预处理作用下市政污泥有机物迁移规律及与黏滞性的关联
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摘要
通过向机械脱水后污泥中添加CaO粉末,在不同预处理时间和温度条件下,测量污泥提取液中蛋白质和多糖的含量,探究不同预处理条件对污泥上清液中有机物含量变化的影响,以及对污泥表面黏附性的影响。测量结果表明,预处理时间的延长会提高污泥上清液中有机物含量;预处理温度的升高也会提高有机物含量;CaO粉末的添加能提高有机物含量,但是添加剂质量分数过高反而会降低有机物含量,如10%CaO添加量时有机物含量反而减少。研究发现,随着CaO引入,污泥表面黏性有明显增加,并推断这和CaO导致的胞内高黏性有机物大量释放密切相关。采用旋转黏度计测量不同CaO含量污泥的黏度值,结果表明,随着CaO添加量的增加,污泥黏性明显降低,但CaO含量达到8%和10%时,污泥混合物的黏度则随时间延长开始增加。
CaO powder was added to the sludge after mechanical dewatering, and the contents of protein and polysaccharides in the sludge extract were measured under different pretreatment time and temperature. The effects of different pretreatment conditions on the content of organic matter in sludge supernatant were investigated, and adhesion properties of sewage sludge werealso explored. The results show that both the increase of pretreatment time and temperature will enhance the content oforganic matter in supernatant. The content of organic matter in the supernatant increases with the increase of CaO powder from 1% to 5%. However, with the further increase of CaO content to 10%, the content of organic matters decreases. It is found that the viscosity of the sludge increased obviously with the introduction of CaO, which may be related to the CaO-induced release of highly viscous organic matter in sludge cells. The viscosity values of sludge with different CaO contents were measured by rotational viscometer. The results show that the viscosity of sludge decreases obviously with increase of CaO addition, but when the CaO content reaches 8% or 10%, the viscosity of sludge mixture begins to increase with time.
CaO powder was added to the sludge after mechanical dewatering, and the contents of protein and polysaccharides in the sludge extract were measured under different pretreatment time and temperature. The effects of different pretreatment conditions on the content of organic matter in sludge supernatant were investigated, and adhesion properties of sewage sludge werealso explored. The results show that both the increase of pretreatment time and temperature will enhance the content oforganic matter in supernatant. The content of organic matter in the supernatant increases with the increase of CaO powder from 1% to 5%. However, with the further increase of CaO content to 10%, the content of organic matters decreases. It is found that the viscosity of the sludge increased obviously with the introduction of CaO, which may be related to the CaO-induced release of highly viscous organic matter in sludge cells. The viscosity values of sludge with different CaO contents were measured by rotational viscometer. The results show that the viscosity of sludge decreases obviously with increase of CaO addition, but when the CaO content reaches 8% or 10%, the viscosity of sludge mixture begins to increase with time.
引文
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[20] 彭晶,郭泽冲,侯玲玲,等.热碱预处理对剩余污泥发酵产酸效能提升的影响 [J].哈尔滨工业大学学报,2012,44(8):43-47.PENG Jing,GUO Ze-chong,HOU Ling-ling,et al.Improvement of acidification performance of waste activated sludge by thermal alkaline pretreatment [J].Journal of Harbin Institute of Technology,2012,44(8):43-47.(in Chinese)
[2] SHENG G P,YU H Q,LI X Y.Extracellular polymeric substances (EPS) of microbial aggregates in biological wastewater treatment systems:a review [J].Biotechnology Advances,2010,28(6):882-894.
[3] 朱睿,吴敏,杨健,等.浓缩污泥中胞外聚合物组分与脱水性的关系 [J].北京大学学报(自然科学版),2010,46(3):385-388.ZHU Rui,WU Min,YANG Jian,et al.Influences of extracellular polymeric substances (EPS) on dewaterability of thickened sludge [J].Acta Scientiarum Naturalium Universitatis Pekinensis,2010,46(3):385-388.(in Chinese)
[4] 王伟之,徐晖,吴兆晴,等.污泥热干燥粘壁的影响因素与机理分析 [J].中国给水排水,2009,25(17):1-4.WANG Wei-zhi,XU Hui,WU Zhao-qing,et al.Analysis on influencing factors and mechanism of sludge adhering behavior during thermal drying [J].China Water & Wastewater,2009,25(17):1-4.(in Chinese)
[5] KRACH K R,LI B,BURNS B R,et al.Bench and full-scale studies for odor control from lime stabilized biosolids:the effect of mixing on odor generation [J].Bioresource Technology,2008,99(14):6446-6455.
[6] NEYENS E,BAEYENS J,DEWIL R,et al.Advanced sludge treatment affects extracellular polymeric substances to improve activated sludge dewatering [J].Hazardous Matericals,2004,106(2-3):83-92.
[7] HURON Y,SALMON T,CRINE M,et al.Effect of liming on the convective drying of urban residual sludges [J].Asia-Pacific Journal Chemical Engineering,2010,5(6):909-914.
[8] DENG W Y,SU Y X.Experimental study on agitated drying characteristics of sewage sludge under the effects of different additive agents [J].Journal of Environmental Sciences,2014,26(7):1523-1529.
[9] LI H,ZOU S X,LI C C.Liming pretreatment reduces sludge build-up on the dryer wall during thermal drying [J].Drying Technology,2012,30(14):1563-1569.
[10] DENG W Y,YUAN M H,MEI J,et al.Effect of calcium oxide (CaO) and sawdust on adhesion and cohesion characteristics of sewage sludge under agitated and non-agitated drying conditions [J].Water Research,2017,110:150-160.
[11] 陈毓荃.生物化学实验方法和技术 [M].北京:科学出版社,2002.
[12] GAUDY A F.Colorimetric determination of protein and carbohydrate [J].Industrial Water Wastes,1962,7(1):17-22.
[13] WERNER S R L,JONES J R,PATERSON A H J.Stickiness during drying of amorphous skin-forming solutions using a probe tack test [J] .Food Engineering,2007,81(4):647-656.
[14] 洪晨,邢奕,王志强,等.无机调理剂与表面活性剂联合调理对污泥脱水性能的影响 [J].化工学报,2014,65(3):1068-1075.HONG Chen,XING Yi,WANG Zhi-qiang,et al.Dewatering performance of sludge modified by inorganic conditioner combined with surfactant [J].CIESC Journal,2014,65(3):1068-1075.(in Chinese)
[15] ROCHER M,ROUX G,GOMA G,et al.Excess sludge reduction in activated sludge processes by integrating biomass alkaline heat treatment [J].Water Science & Technology A:Journal of the International Association on Water Pollution Research,2001,44(2-3):437-444.
[16] 冯凯,黄鸥.石灰调质与石灰干化工艺在污泥脱水中的应用 [J].给水排水,2011,37(5):7-10.FENG Kai,HUANG Ou.Application of lime conditioning and lime drying technology in sludge dewatering [J].Water & Wastewater Engineering,2011,37(5):7-10.(in Chinese)
[17] 洪晨,邢奕,王志强,等.不同pH下表面活性剂对污泥脱水性能的影响 [J].浙江大学学报(工学版),2014,48(5):850-857.HONG Chen,XING Yi,WANG Zhi-qiang,et al.Influence of surfactant conditioning on sludge dewaterability in various PH value [J].Journal of Zhejiang University (Engineering Science),2014,48(5):850-857.(in Chinese)
[18] NEYENS E,BAEYENS J.A review of thermal sludge pre-treatment processes to improve dewaterability [J].Hazardous Materials,2003,98(1-3):51-67.
[19] 杨国友,石林,柴妮.生石灰与微波协同作用对污泥脱水的影响 [J].环境化学,2011,30(3):698-702.YANG Guo-you,SHI Lin,CHAI Ni.The effect of calcium oxide combined with microwave on sludge dewatering [J].Environmental Chemistry,2011,30(3):698-702.(in Chinese)
[20] 彭晶,郭泽冲,侯玲玲,等.热碱预处理对剩余污泥发酵产酸效能提升的影响 [J].哈尔滨工业大学学报,2012,44(8):43-47.PENG Jing,GUO Ze-chong,HOU Ling-ling,et al.Improvement of acidification performance of waste activated sludge by thermal alkaline pretreatment [J].Journal of Harbin Institute of Technology,2012,44(8):43-47.(in Chinese)
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