摘要
脱硫废水零排放是火电厂废污水管理的重点内容,水泥固化技术作为零排放的最终处置手段具有潜力,其中水泥固化技术工艺简单,制得的固化体性能稳定,应用广泛。为进一步优化水泥固化技术在高盐脱硫废水处理中的应用,基于现有的烟气浓缩脱硫废水及水泥固化技术开展耐久性能试验,将固化体抗压强度作为主要考核指标考察固化效果。首先将脱硫废水与水泥、粉煤灰和河砂拌合制得固化体,养护至特定龄期后检测其抗压强度。通过控制单变量的方法设计正交试验,探究水胶比、泥灰比以及河砂量对固化体抗压强度的影响。结果表明:水胶比对混凝土抗压强度的影响显著,固化组分配比优选的关键在于水胶比,水胶比增大会导致固化体抗压强度下降,水胶比在0.4~0.6为宜;当泥灰比达3.2∶1.0时,固化体抗压强度性能最佳;而河砂量的变化对固化体抗压强度影响较小。同时对重金属离子的浸出率进行分析,证明了固化途径的可行性,为高盐脱硫废水固化研究提供基础数据。
Zero discharge of desulfurization wastewater is the key content of waste water management in thermal power plants.Cement solidification technology has potential as the final disposal means of zero discharge.The cement solidification technology has simple process,stable performance and wide application.In order to further optimize the application of cement immobilization technology in high concentration FGD wastewater treatment,durability research experiments were conducted based on the existing FGD wastewater flue gas concentration and cement curing technology.The compressive strength of the cured body was used as the basis for investigating the curing effect.Firstly,the curing body was made by mixing the FGD wastewater with cement,fly ash and river sand,and the compressive strength was tested after curing to a specific age.The orthogonal experiment was designed by controlling univariate method to investigate the effects of water-cement ratio,cement-ash ratio and river sand amount on the compressive strength of the cured body.The results show that the water-cement ratio has a significant effect on the compressive strength of concrete.The key to the selection of the curing composition ratio is the water-cement ratio,which leads to a decrease in the compressive strength of the cured body if the water-cement ratio increases.The water-cement ratio is controlled at 0.4-0.6.When the mud-cement ratio reaches 3.2∶1.0,the compressive strength performance of the cured body reaches the best state;and the change in the amount of river sand has less effect on the compressive strength of the cured body.At the same time,the leaching rate of heavy metal ions was analyzed to prove the feasibility of the curing method.The research provides basic data for the cement fixation of high salinity desulfurization wastewater.
作者
郑扬帆
黄文耀
杜志坚
乔琳
曲保忠
武凯
马双忱
ZHENG Yangfan;HUANG Wenyao;DU Zhijian;QIAO Lin;QU Baozhong;WU Kai;MA Shuangchen(Guangdong Honghaiwan Power Generation Co.,Ltd.,Shanwei516623,China;Department of Environmental Science and Engineering,North China Electric Power University,Baoding071003,China)
出处
《洁净煤技术》
CAS
北大核心
2022年第5期204-210,共7页
Clean Coal Technology
关键词
脱硫废水
粉煤灰
固化
抗压强度
水胶比
泥灰比
desulfurization wastewater
fly ash
solidification
compressive strength
water-cement ratio
mud-cement ratio
