ANAEROBIC DIGESTION OF WASTE ACTIVE SLUDGE (WAS): THE RELEASE AND RECOVERY OF NITROGEN AND PHOSPHORUS

作者：Bi Dong su^*; Guo Xiao pin; Chen Dong hui

来源：Fresenius Environmental Bulletin, 2012, 21(5A): 1283-1289.

• Waste active sludge (WAS)
• Anaerobic digestion
• Nitrogen (N)
• Phosphorus (P)
• Release

This study was conducted to investigate the release of N and P from waste active sludge (WAS) during anaerobic digestion at different pH values and temperatures. Similar to the release of SCOD and solubilization of VSS, the forms of N and P released were shown to be more dependent on pH than temperature. NH4+-N was the most prevalent form released under acidic pH conditions. Due to volatilization, the loss of nitrogen (LN) was most prevalent at alkaline pH. Although more P was released at alkaline pH, the concentration of PO43--P at acidic pH was higher than at alkaline pH because most of P released at acidic pH existed in the form of PO43--P. Further investigation suggested that most of the NH4+-N and PO43--P could be efficiently removed by the crystallization of MAP (MgNH4PO4.6H(2)O), but the soluble rest nitrogen (SRN) and soluble rest phosphorus (SRP) could not, which indicated that it is feasible to recover NH4+-N and PO43--P simultaneously from the digestion supernatant of WAS. However, the recovery efficiency was substantially dependent on the forms of N and P. Accordingly, it is necessary to transform the SRN and SRP into NH4+-N and PO43--P before the crystallization of MAP.

• 出版日期2012
• 单位上海应用技术大学