摘要
为了进一步优化含铬废水的处理,文章采用经24 h培养的硫酸盐还原菌(SRB)菌群对含Cr(Ⅵ)废水进行吸附去除实验,研究了SRB对Cr(Ⅵ)吸附的影响因素,对去除过程进行动力学和热力学分析。实验结果表明:在Cr(Ⅵ)浓度为10 mg/L条件下,SRB菌群在摇床温度为35℃,pH=3时Cr(Ⅵ)的去除效果最好,去除率可达93.75%。去除过程符合准二级动力学反应模型,表观吸附活化能为16.853 kJ/mol,此结果表明吸附过程以物理吸附为主。以SRB菌群为吸附剂,其对铬的吸附结果与Langmuir等温吸附模型更相符。吸附热力学结果为?G<0、?H<0、?S<0,说明吸附反应为自发进行,放热且熵减小的过程。
The sulfate-reducing bacteria(SRB)cultured in 24 hours were used to absorb Cr(Ⅵ)-containing wastewater.The factors affecting the optimal adsorption conditions of Cr(Ⅵ)were studied,and the kinetics of the removal process was analyzed.The experimental results show that the SRB flora has the best removal effect when the Cr(Ⅵ)concentration is 10 mg/L and the pH value is 3 at a shaking temperature of 35℃,and the removal efficiency can reach 93.75%.The removal process conformed to the pseudo second-order kinetic model.The apparent activation energy was 16.853 kJ/mol.It shows that this adsorption process is based on physical adsorption.The simulation of the adsorption process of chromium with SRB was consistent with the Langmuir isotherm model.The adsorption thermodynamic results were?G<0,?H<0,?S<0.,indicating that this adsorption reaction was a spontaneous process that emits heat and the entropy decreases.
作者
王浩东
李群
杨琦
WANG Haodong;LI Qun;YANG Qi(School of Engineering Technology,China University of Geosciences in Beijing,Beijing 100083,China;School of Water Resources and Environment,China University of Geosciences in Beijing,Beijing 100083,China)
出处
《环境科学与技术》
CAS
CSCD
北大核心
2018年第A02期37-42,共6页
Environmental Science & Technology
基金
国家水体污染控制与治理科技重大专项(2015ZX07406005-001)
中央高校基本科研业务费专项资金(2652013087)
关键词
硫酸盐还原菌
六价铬
吸附
动力学
热力学
sulfate-reducing bacteria
hexavalent chromium
adsorbtion
kinetic
thermodynamic