摘要
本研究采用过氧化钙对活性污泥进行预处理,深入分析了调理过程中污泥过滤脱水性能、絮体结构以及反应动力学的变化特性,探讨了亚铁离子协同过氧化钙处理对污泥特性的影响.结果表明,经过CaO_2处理后,污泥的过滤脱水性能先改善后恶化,当投加量(以TSS计)为20 mg·g^(-1)时,污泥的过滤脱水效果达到最佳.同时,污泥絮体结构变得疏松破碎,其上清液有机物浓度出现了明显的上升,污泥得到了有效裂解.污泥溶解反应过程遵循零级反应动力学模型,反应速率常数为15.2mg·L^(-1)·h^(-1).此外,亚铁离子和CaO_2协同处理可以进一步强化污泥中大分子有机物的裂解释放,同时,反应过程中形成铁离子的絮凝作用可以实现污泥絮体结构的重建,从而改善污泥过滤脱水性能.该研究成果为CaO_2及其联用处理技术在污泥处理过程中的应用提供了必要的理论依据.
The evolution of sludge filteration dewaterability,floc structure and hydrolytic kinetics with calcium peroxide oxidation pretreatment was investigated in this study. The effect of sludge characteristics with combined process of ferrous ion and calcium peroxide was deeply analyzed and the result suggested that the sludge dewatering performance was improved first and then worsened after CaO2 addition. When the dosage was 20 mg·g（-1）,sludge reached its optimal dewaterability. At the same time,sludge was effectively dissolved and the floc structure became loose and broken with the increase of organic matters in the supernatant. Moreover,sludge solubilization process followed the pseudo-zero-order kinetic equation well and the reaction rate of sludge with CaO2 treatment was 15. 2mg·L（-1）·h（-1）. In addition,sludge floc lysis was enhanced by the treatment of ferrous ion and calcium peroxide oxidation,whilst sludge dewaterability was improved due to the reconstruction of sludge floc structure by the iron ions produced. This study provided theoretical basis for application of calcium peroxide pre-treatment and its combining technique in sludge treatment.
作者
白润英
陈湛
张伟军
王东升
BAI Run-ying CHEN Zhan ZHANG Wei-jun WANG Dong-sheng(School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, China State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eeo-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China School of Environmental Studies, China University of Geoseienees, Wuhan 430074, China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2017年第3期1151-1158,共8页
Environmental Science
基金
中国博士后科学基金项目(2016M590733)
中央高校基本科研业务费专项(CUG160824)
国家自然科学基金项目(51678546)
关键词
活性污泥
过氧化钙
亚铁
絮体形态
脱水性
activated sludge
calcium peroxide
ferrous ion
floc morphology
dewaterability
