Disinhibition of the ammonium nitrogen in autothermal thermophilic aerobic digestion for sewage sludge by chemical precipitation

作者：Yuan, Haiping; Xu, Changwen; Zhu, Nanwen^*

来源：Bioresource Technology, 2014, 169: 686-691.

DOI：10.1016/j.biortech.2014.07.016

• Sewage sludge
• Ammonium nitrogen disinhibition
• Autothermal thermophilic aerobic digestion (ATAD)
• Magnesium ammonium phosphate (MAP) precipitation
• Stabilization

Magnesium ammonium phosphate (MAP) precipitation was introduced to remove ammonium nitrogen (NH4+-N) in autothermal thermophilic aerobic digestion (ATAD) in this study by addition of MgCl2 center dot 6H(2)O and NaH2PO4 center dot 2H(2)O. The results showed that the lowest NH4+-N concentration was found in the D2 digester after 2nd day dosing treatment and 38.12% of VS removal efficiency was obtained after 15 days ATAD treatment. Sludge stabilization was achieved in the D2 digester 6 days earlier than the non-dosing digester when 8.7 g/L MgCl2 center dot 6H(2)O and 6.7 g/L NaH2PO4 center dot 2H(2)O were added into the digester. Furthermore, the highest VS removal efficiency of 40.03% was observed after 21 days digestion in D2 digesters. Therefore, MAP precipitation was an effective method for the ammonium nitrogen disinhibition when 8.7 g/L MgCl2 center dot 6H(2)O and 6.7 g/L NaH2PO4 center dot 2H(2)O were added into on the 2nd day after the digester startup.

• 出版日期2014-10
• 单位上海交通大学