The Nitrogen Removal Performance about ANAMMOX Sludge Immobilized in Polyvinyl Alcohol (PVA) Gel

Abstract

This study evaluated the use of PVA gel to encapsulate slow-growing anaerobic ammonia oxidation (ANAMMOX) bacteria for deammonification in wastewater treatment. Different kinds of granules with ANAMMOX sludge immobilized in PVA gel in different mass concentration 6%, 10%, 15%, 20% were prepared by cross-linking in calcium chloride solution and nitrogen removal experiments were carried out. The results showed that 10% was the best concentration for ANAMMOX sludge to be immobilized in PVA gel when better nitrogen removal performance with ammonia removal rate (ARR) and nitrite removal rate (NIRR) reaching up to 90% and mechanical strength were estimated synthetically. The tolerance experiments in salt-containing waste water showed that the immobilized granules had the better tolerance than ANAMMOX sludge.