摘要
针对造纸废水好氧处理中钙离子(Ca^2+)浓度过高影响生化过程和后续膜处理的问题,在实验室模拟废水曝气,研究Ca^2+存在对COD去除效果的影响;对厌氧出水进行曝气实验,探究曝气量对钙去除效果的影响;分析表征造纸废水液相中Ca^2+浓度和固相污泥中钙的形态,探究造纸废水曝气池中钙的迁移转化规律.结果发现:Ca^2+的存在会影响活性污泥的活性,进而导致曝气过程中COD的去除率从71.76%降至36.94%;厌氧出水曝气初始阶段内曝气量越大,Ca^2+的去除率越高;Ca^2+浓度从厌氧出水到二沉池出水过程中逐渐下降,从游离态转变为CaCO3的结合态而除去.
Aiming at the problem that high concentration of Ca^2+in aerobic treatment of paper mill wastewater affects the biochemical process and its subsequent membrane treatment,this study firstly analyzed the effect of Ca^2+on the removal of COD in the experiment of calcium removal by the simulated wastewater.Then the anaerobic effluent was used to investigate the effect of aeration rate on calcium removal.The concentration of Ca^2+in the liquid phase of paper mill wastewater and the form of calcium in the solid phase sludge were finally characterized to explore the migration and transformation of calcium in the aeration tank of paper mill wastewater.The results show that the presence of Ca^2+has a negative influence on the active sludge,resulting in a significant decrease of removal rate of COD from 71.76%to 31.94%.In the process of anaerobic effluent aeration,the Ca^2+removal rate increased with the aeration rate at the beginning.From the anaerobic to secondary sedimentation pond,the Ca^2+concentration reduction occurs gradually during the process of aerobic treatment.The calcium mainly was transformed into calcite after it entered the solid phase from the liquid phase.
作者
崔明启
张弛
陈逸帆
徐新华
徐清凉
赵炳军
程丽华
CUI Mingqi;ZHANG Chi;CHEN Yifan;XU Xinhua;XU Qingliang;ZHAO Bingjun;CHENG Lihua(College of Environmental&Resource Sciences,Zhejiang University,Hangzhou 310058;Zhejiang Jingxing Paper Co.,Ltd,Jiaxing 314214;MOE Engineering Research Center of Membrane&Water Treatment Technology,Zhejiang University,Hangzhou 310058)
出处
《环境科学学报》
CAS
CSCD
北大核心
2020年第6期2128-2135,共8页
Acta Scientiae Circumstantiae
基金
国家水体污染控制与治理科技重大专项(No.2017ZX07206⁃002)
中央高校基本科研业务费专项资金资助项目。
关键词
造纸废水
曝气
CA2+
迁移转化
去除
paper mill wastewater
aeration
Ca2+
migration and transformation
removal