异养硝化-好氧反硝化粪产碱杆菌处理高氨氮污泥厌氧消化液

具有异养硝化-好氧反硝化特性的粪产碱杆菌(Alcaligenes faecalis No.4)直接处理污泥厌氧消化液中的高浓度氨氮时,在60 h内氨氮(原始浓度441 mg/L)去除率约为18%。沼液中碳源验证实验表明,乙酸可作为其优质碳源。因而,可以通过外加乙酸钠的方式来解决污泥厌氧消化液碳源不足的问题。当污泥消化液中添加足够的碳源-乙酸钠使得C/N为10时,Alcaligenes faecalis No.4的脱氮效果良好,氨氮的去除率达到了98%以上。研究结果表明,在利用粪产碱杆菌处理高浓度氨氮沼液时,酸化污泥作为外加碳源的方式具有其理论可行性。

High strength ammonium removal in sludge digestate by Alcaligenes faecalis strain No.4 with heterotrophic nitrification and aerobic denitrification

In this study, Alcaligenes faecalis strain No.4, which is capable of heterotrophic nitrification and aerobic denitrification, was utilized to directly remove high strength ammonium from the effluent of an anaerobic digester with dewatered sludge.Within 60 h, around 18% of the ammonium (with an initial concentration of 441 mg/L) was removed through direct treatment with Alcaligenes faecalis No.4.Among the carbon sources contained in the digestate, acetic acid proved to be most suitable.Thus, the lack of carbon sources in the high strength ammonium treatment system could be counteracted by the addition of sodium acetate.When enough sodium acetate was added to ensure the optimal C/N ratio of 10:1, the ammonium removal rate could eventually reach 98%.Therefore, the acidified sludge could be further proposed to be a potential carbon source due to the highly concentrated acetate generated during acidification.