摘要
研究钙矾石法对反渗透浓水硫酸根的去除效果,探讨pH、氯化钙投加量n(Ca/S)、偏铝酸钠投加量n(Al/S)、初始硫酸根质量浓度等因素对硫酸根去除效果的影响。结果表明,对于硫酸根质量浓度为1015 mg/L的反渗透浓水,通过钙矾石法可将其中83.44%硫酸根去除;试验最佳工艺参数为pH=12.0、n(Ca/S)=4、n(Al/S)=0.7;三者对试验影响的排序为pH>n(Al/S)>n(Ca/S),其中pH是关键因素,在处理效果中起绝对主导作用,偏铝酸钠投加量次之。对于初始硫酸根质量浓度不同的废水,处理效果有明显差异,在初始硫酸根质量浓度为1090~1550 mg/L内,随着硫酸根初始质量浓度增加,硫酸根去除率逐渐增大。该方法的弊端在于残留钙离子质量浓度较大,后续可通过投加碳酸钠将残留钙转化成碳酸钙以实现其资源化利用。
The removal efficiency of sulfate from reverse osmosis concentrated water by ettringite method is studied,and the effects of pH value,calcium sulfate ratio n(Ca/S),aluminum sulfate ratio n(Al/S),initial sulfate concentration and other factors on the reaction are explored.The results show that for reverse osmosis concentrated water with a mass concentration of sulfate of 1015 mg/L,the removal rate of sulfate can be increased to over 80%through the ettringite method.The optimal process parameters are as follows:pH=12.0,n(Ca/S)=4,n(Al/S)=0.7.The ranking of the impact of the three factors on the experiment is as follows:pH>n(Al/S)>n(Ca/S),with pH being the key factor and playing a dominant role in the treatment effect,followed by aluminum content.This method has significant differences in treatment efficiency for wastewater with different initial sulfate concentration.Within the range of initial sulfate mass concentration of 1090~1550 mg/L,as the initial mass concentration of sulfate increases,the removal rate of sulfate gradually increases.The disadvantage of this method is that the mass concentration of residual calcium is relatively high,and subsequently residual calcium can be converted to calcium carbonate by adding sodium carbonate to achieve its resource utilization.
作者
程军
CHENG Jun(Huaihu Power Co.,Ltd.Tianji Power Plant,Huainan 232000,China)
出处
《湖南电力》
2024年第4期68-72,共5页
Hunan Electric Power
基金
国家电力投资集团有限公司科技项目(TC2019HD03)。
关键词
钙矾石
硫酸根
正交试验
偏铝酸钠
ettringite(AFt)
sulfate
orthogonal test
NaAlO_(2)
