摘要
制革废水因具有较低的碳氮比(C/N),在废水的生物处理过程中厌氧反硝化反应不完全,总氮很难被彻底去除。用乙酸钠作为外加碳源以提高制革废水的反硝化效率,促进总氮的去除。试验结果表明,乙酸钠作为反硝化碳源的最适COD/TN为5.1,在此条件下制革废水的总氮去除率达到95%。与添加常见的葡萄糖碳源相比,在反硝化过程中外加乙酸钠更利于总氮的快速去除。上述结果表明乙酸钠是一种高质碳源,有利于制革废水彻底且快速的反硝化脱氮。较低的水温以及较高的氯离子浓度会导致反硝化速率的下降。但在外加乙酸钠保证碳源充足的前提下,即使水温为15℃或氯离子浓度为10000 mg/L时,制革废水仍可以进行彻底的反硝化反应。
Total nitrogen(TN) in tannery wastewater is difficult to remove completely,because the low C/N ratio of the wastewater leads to inadequate denitrification. Sodium acetate was used as an extra carbon source to improve the denitrification efficiency and the TN removal. The appropriate COD/TN ratio for denitrification using sodium acetate was 5.1,at which the TN concentration of tannery wastewater decreased by 95%. A much faster removal of TN was obtained by adding sodium acetate in denitrification than by adding common glucose. These results showed that sodium acetate was a high-quality carbon source for a complete and rapid denitrification of tannery wastewater. The denitrification efficiency decreased with decreasing temperature and increasing chloride concentration. However,when the carbon source was made sufficient by adding sodium acetate,complete denitrification was still obtained even at 15 ℃ or 10 000 mg/L of chloride concentration.
作者
马小剑
周建飞
曾运航
石碧
MA Xiaojian;ZHOU Jianfei;ZENG Yunhang;SHI Bi(National Engineering Laboratory for Clean Technology of Leather Manufacture,Sichuan University,Chengdu 610065,China;Maydiang(Sihong)Leather Co.Ltd.,Suqian 223900,China;Key Laboratory of Leather Chemistry and Engineering(Sichuan University),Ministry of Education,Chengdu 610065,China)
出处
《中国皮革》
CAS
2020年第4期54-59,共6页
China Leather
基金
国家自然科学基金项目(21878193)
四川省青年科技创新研究团队(2017TD0010)资助项目的资助。
