摘要
面向煤化工高盐水资源化处理的技术需求,结合钙、镁、硅、氟等杂质大量共存的水质特点,实验研究了一条以两步法化学沉淀(加碱调pH沉淀,加碳酸钠沉淀)为主的无机杂质协同去除技术路线。结果表明,在控制pH≥11.1的条件下,化学沉淀可将钙、镁、硅协同去除至20、5、4.7 mg/L以下;选择氢氧化钙调pH还可同时取得显著除氟效果,但氟离子去除率随原水硫酸根浓度在16.1~64.3 g/L间的递增而由93.0%逐渐下降至62.2%。当协同除氟不能满足产水要求时,验证了增加一步铝盐絮凝沉淀将氟离子除至20 mg/L以下的可行性。
To meet technical requirements of resource treating for the high-salt wastewater of coal chemical industry,and according to quality characteristics of this wastewater which contains large amounts of impurities such as calcium,magnesium,silicon and fluorine,this paper experimentally studied on a technical route for the synergistic removal of inorganic impurities.The technical route is mainly composed of two chemical precipitation steps by adjusting the pH with alkali and adding sodium carbonate.Results of this study show that contents of calcium,magnesium and silicon could be respectively reduced to less than 20 mg/L,5 mg/L and 4.7 mg/L,due to synergistic actions in the process of chemical precipitation with the pH of 11.1 or more.Meanwhile,if calcium hydroxide was used to adjusting the pH,an obvious synergistic removal effect of fluorinion could be observed.However,the removal rate of fluorinion gradually decreased from 93.0%to 62.2%when the sulfate concentration in raw water gradually raised from 16.1 g/L to 64.3 g/L.In case of that the synergistic removal was not enough for reducing fluorinion content to less than 20mg/L,a flocculation sedimentation process with polyaluminium chloride was added after the chemical precipitation and was proven to be effective.
作者
王伟
仝胜录
刘捷
熊日华
WANG Wei;TONG Shenglu;LIU Jie;XIONG Rihua(National Institute of Clean-and-Low-Carbon Energy,Beijing 102211,China)
出处
《水处理技术》
CAS
CSCD
北大核心
2022年第6期30-33,共4页
Technology of Water Treatment
基金
国家能源集团科技创新项目(GJNY-21-83)。
关键词
高盐水
无机杂质
协同去除
high-salt wastewater
inorganic impurities
synergistic removal
