摘要
以钌钛铱电极为阳极电解预处理污泥,研究其脱水机理、直接氧化的影响和电解过程中可能产生的氧化物质以及氧、过氧化氢、臭氧和羟基自由基对污泥胞外聚合物(EPS)的影响。在外加电场作用下会产生O_(2)和OH^(-),但不产生H_(2)O_(2)和O_(3)。O_(2)对多糖(PS)和蛋白质(PN)的降解无明显影响;OH^(-)含量与电流密度呈正相关,且EPS的降解主要是由OH^(-)氧化引起的。水含量(WC)的降低主要归因于OH^(-)对絮凝体结构和细胞膜的攻击和破坏,增加了EPS的质量浓度,并且降解了一部分PN和PS。经电解处理的污泥毛细管抽吸时间(CST)高于未处理的污泥,归因于电解过程中EPS质量浓度的增加和污泥絮体尺寸的减小。污泥中的HgO在电脱水过程中更多地进入水相并被氧化,元素汞在OH^(-)的作用下被氧化成Hg^(2+)。
The sludge was pretreated by using Ti/RuO_(2)-IrO_(2)electrode as the anode,the dewatering mechanism,the influence of direct oxidation and the potential oxidizing substances produced in the process of electrolysis,such as oxygen,hydrogen peroxide,ozone and hydroxyl radicals,on the extracellular polymeric substance(EPS)of sludge was studied.There were O_(2)and OH^(-)produced but no H_(2)O_(2)and O_(3)under an external electric field.O_(2)had no obvious effect on the degradation of polysaccharides(PS)and proteins(PN);OH^(-)content was positively correlated with current density and the degradation of EPS was main caused by oxidation of OH^(-).The reduction of the water content(WC)was mainly attributed to the OH^(-)responsible for attacking and disrupting floc structure and cell membranes,increasing the concentration of EPS,and degrading some PN and PS.The capillary suction time(CST)of the sludge treated by electrolysis was higher than those of the untreated sludge due to the increase in EPS content and the decrease in the size of sludge floc during electrolysis.The HgO in the sludge entered the water phase more and was oxidized during the electric dehydration process,and the elemental mercury was oxidized into Hg^(2+)under the action of OH^(-).
作者
朱兵
庾小芳
李新
唐楚寒
王希红
王梓阳
李森
ZHU Bing;YU Xiaofang;LI Xin;TANG Chuhan;WANG Xihong;WANG Ziyang;LI Sen(Kela Oil and Gas Development Department of Tarim Oilfield Branch Company,Aksu Xinjiang 842008,China;Guizhou Merit Environmental Technology Co.,Ltd.,Guiyang Guizhou 550001,China;Guizhou Normal University,Guiyang Guizhou 550025,China)
出处
《当代化工》
CAS
2024年第5期1110-1121,共12页
Contemporary Chemical Industry
基金
国家自然科学基金项目(项目编号:22266009)
贵州师范大学博士研究基金项目(项目编号:GZNUD[2019]6号)
贵州省科技计划项目(项目编号:黔科合支撑[2024]一般118)。
