硝酸盐存在对硫自养/电化学氢自养组合工艺还原高氯酸盐性能影响  

Effects of NO_3^--Appearance on Perchlorate Reduction of The Combined Process of Electrochemical Hydrogen Autotrophy and Sulfur Autotrophy

作　　者：赵堃[1,2] 张健[1,2] 王森[1] 郑栋[1] 王雪礁 李志伟[1] 高孟春[1,2] 

机构地区：[1]中国海洋大学海洋生态与环境教育部重点实验室,山东青岛266100 [2]中国海洋大学环境科学与工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2017年第4期100-105,共6页Periodical of Ocean University of China

基　　金：国家自然科学基金项目(21077096)资助~~

摘　　要：评价了进水NO_3^--N浓度变化对硫自养/电化学氢自养还原高氯酸盐性能的影响。研究结果表明,与进水NO_3^--N浓度为0mg/L相比,进水NO_3^--N浓度为10mg/L时对硫自养/电化学氢自养组合工艺还原ClO_4^-效果无明显影响,进水NO_3^--N浓度为30和50mg/L时硫自养段和电化学氢自养段出水ClO_4^-浓度明显增加。进水中NO_3^--N和ClO_4^-硫自养还原和氢自养还原过程存在着竞争关系,ClO_4^-还原过程出现了滞后,相同的硫自养和氢自养条件下NO_3^--N比ClO_4^-优先被还原。硫自养段出水pH在7.40~7.98范围内变化。在氢自养段将硫自养还原NO_3^--N和ClO4产生的H+作为电化学产氢还原NO_3^--N和ClO_4^-的前驱物,使电化学氢自养段出水pH升高,从而有效地解决了硫自养段出水pH降低的问题。The effects of NO3--N concentration on perchlorate reduction were evaluated in electrochemical hydrogen autotrophy and sulfur autotrophy. Compared with 0 mg/L NO3--N, the ClO4 reduction efficien- cy had no obvious variation at 10 mg/L NO3--N in the combined process of electrochemical hydrogen autot- rophy and sulfur autotrophy. The ClO4- concentration from both electrochemical hydrogen autotrophy and sulfur autotrophy showed obvious increase at 30 and 50 mg/L NOT-N. As a competitive relation existed in the electrochemical hydrogen autotrophy and sulfur autotrophy of NO3--N and ClO2, the ClO4-reduction process was inhibited under the appearance of NO3--N, suggesting the NO3--N reduction were preferential to theClO4-reduction under the same conditions of hydrogen autotrophy and sulfur autotrophy. The efflu- ent pH from the sulfur autotrophy varied between 7.40 and 7.98. H＋ from the sulfur autotrophic reduction of NO3--N and C104 became the precursor of the electrochemical hydrogen autotrophic reduction of NO3--N and ClO4-, which resulted in the increase of pH from electrochemical hydrogen autotrophy and settled the problem of excessively high pH from the sulfur autotrophy.

关 键 词：硝酸盐 高氯酸盐 硫自养还原 电化学氢自养还原 

分 类 号：O611.65[理学—无机化学]