Ammonium nitrogen removal from the permeates of anaerobic membrane bioreactors: economic regeneration of exhausted zeolite

作者：Deng Qiaosi; Dhar Bipro Ranjan; Elbeshbishy Elsayed; Lee Hyung Sool^*

来源：Environmental Technology, 2014, 35(16): 2008-2017.

DOI：10.1080/09593330.2014.889759

• regeneration
• anaerobic membrane bioreactors
• ammonium exchange capacity
• alkaline pH
• natural zeolite

This study revealed that ammonium exchange of natural zeolite could be an economical method of nitrogen removal from the permeates of anaerobic membrane bioreactors (AnMBRs). It was found that the mass ratio of Na (+) to significantly affected regeneration efficiency (RE), not simply NaCl concentration. Batch experiments showed that the mass ratio of 750g Na (+)/g was required to achieve RE over 90% in 2h at pH 9. However, the alkaline regeneration at pH 12 significantly decreased the mass ratio down to 4.2 in batch tests. It was confirmed that the alkaline regeneration only needed NaCl 10g/L (the mass of Na (+) to of 4.2) for RE of 85% in 2h of reaction time in continuous column tests. Economic analysis showed that this alkaline regeneration decreased chemical costs over 10 times as compared with a conventional regeneration method. A significant bottleneck of zeolite processes would be the requirement of substituting exhausted zeolite with virgin one, due to the reductions of ammonium exchange capacity and RE.

• 出版日期2014-8-18