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- Title
Influence of N/COD ratios and nitrogen forms on aerobic granulation in sequencing batch airlift reactor.
- Authors
Hoang Nhat Phong Vo; Gia-Ky Le; Thi Minh Hong Nguyen; Thanh-Tin Nguyen; Thanh-Binh Nguyen; Van-Tung Tra; Xuan-Thanh Bui
- Abstract
This study investigated the effects of different N/COD ratios (N as variable) and N forms on (i) the granulation and characteristics and (ii) pollutants removal of aerobic granular sludge. The 10/150 ratio resulted in the highest biomass concentration of 22,000 mg/L. The granules were measurable with the largest size (2.0 mm) in the culture of both forms of NH4+-N and NO3--N (N/COD of 10/150) whilst the sole NH4+-N cultures (N/COD of 5/150 and 30/150) received smaller granules size of 0.2 and 1.1 mm, respectively. The NO3--N source was found as the key factor determining the granule formation. With reference to pollutants treatment, the COD removal efficiencies were above 94% regardless of the N/COD ratios and nitrogen forms. Given this situation, the additional NO3--N of 10/150 ratio (NH4+-N:NO3--N = 1:1) could enhance the granule size and total nitrogen removal.
- Subjects
GRANULATION; BATCH reactors; NITROGEN; POLLUTANTS
- Publication
Desalination & Water Treatment, 2020, Vol 174, p90
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2020.24874