期刊
ENVIRONMENTAL POLLUTION
卷 284, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.117495
关键词
Nitrogen circulation; Ammonium adsorption; Ammonium recycling; Prussian blue; Hexacyanoferrate; Granulated adsorbent; Sewage water; Digested sludge filtrate
资金
- New Energy and Industrial Technology Development Organization (NEDO) [JPNP18016]
A highly selective adsorbent based on copper hexacyanoferrate was developed to recover ammonium ions from sewage water, demonstrating stable performance with the ability for repeat use.
One of the strategies to realize a nitrogen cycle society, we attempted to recover ammonium ions from industrial wastewater, especially sewage water with adsorbent materials. We have developed an adsorbent with high ammonium selectivity based on copper hexacyanoferrate and granulated it as pellets. Using a compact column system filled with this granule adsorbent, ammonium ions were recovered from sewage containing 1000-1500 mg-NH4+/L ammonium ions. Despite the coexistence of many metal ions, the adsorbent selectively and stably adsorbed ammonium ions. Furthermore, it was shown that the saturated adsorbent can be regenerated by flowing a potassium ion solution through a column adsorbent to desorb ammonium ions. In other words, the column can be used repeatedly, and there was almost little deterioration in adsorption even after 250 cycles. In addition, it was shown that by increasing the number of stages of this column, it is possible to sufficiently reduce the ammonium in the adsorbent solution and recover the concentrated ammonium solution.
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