EurekaMag.com logo
+ Site Statistics
References:
53,214,146
Abstracts:
29,074,682
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The roles of nitrogen dissimilation and assimilation in biological nitrogen removal treating low, mid, and high strength wastewater


Journal of Environmental Engineering and Science 6(5): 483-490
The roles of nitrogen dissimilation and assimilation in biological nitrogen removal treating low, mid, and high strength wastewater
Nitrogen dissimilation (nitrification and denitrification) and assimilation (uptake by cell growth) under different operational conditions (chemical oxygen demand (COD) and dissolved oxygen (DO)) were evaluated in a sequencing batch reactor (SBR) system. Nitrogen dissimilation played an important role for nitrogen removal at low to mid CODs, while nitrogen assimilation became more significant with biomass concentration steadily increasing at high COD. Specific denitrification rate increased at low to mid COD (C:N < 15), but decreased at high COD (C:N > 20). Both COD and C:N ratio should be kept in proper ranges to obtain sufficient biomass concentration for nitrogen assimilation in treatment systems. With alkalinity being consumed in nitrification and produced-in denitrification, effluent alkalinity indicated the corresponding nitrogen concentrations under different COD loadings. Delta Alk between influent and effluent was also well correlated with assimilation and dissimilation. The discrepancy between Delta Alk(Theory) and AAlk(Experi) was less than 15 mg/L when dissimilation played a predominant role in nitrogen removal, while the discrepancy increased to 30 mg/L when assimilation became dominant.

(PDF same-day service: $19.90)

Accession: 017472885

DOI: 10.1139/s07-001



Related references

Biological nitrogen removal of high-strength ammonium industrial wastewater with two-sludge system. Water Research 37(17): 4211-4221, 2003

Aerobic granules formation and simultaneous nitrogen and phosphorus removal treating high strength ammonia wastewater in sequencing batch reactor. Bioresource Technology 171: 211-216, 2015

Effect of influent COD/N ratio on biological nitrogen removal (BNR) from high-strength ammonium industrial wastewater. Process Biochemistry 39(12): 2035-2041, 2004

Acrylonitrile removal from synthetic wastewater and actual industrial wastewater with high strength nitrogen using a pure bacteria culture. Water Science and Technology 43(2): 349-354, 2001

Evolution of N-converting bacteria during the start-up of anaerobic digestion coupled biological nitrogen removal pilot-scale bioreactors treating high-strength animal waste slurry. Bioresource Technology 100(14): 3678-3687, 2009

Organic and nitrogen removal in a two-stage rotating biological contactor treating municipal wastewater. Bioresource Technology 93(1): 91-98, 2004

Advanced nitrogen and phosphorus removal in A2O-BAF system treating low carbon-to-nitrogen ratio domestic wastewater. Frontiers of Environmental Science & Engineering in China 5(3): 474-480, 2011

Carbon and nitrogen removal from low-strength domestic wastewater with a two-stage submerged biological filter. Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances & Environmental Engineering 42(5): 641-647, 2007

Biological nitrogen removal in a step-feed CAST with real-time control treating municipal wastewater. Water Science and Technology 61(9): 2325-2332, 2010

Biological phosphorus and nitrogen removal in a full scale sequencing batch reactor treating piggery wastewater. Water Science & Technology 40(1): 199-206, July, 1999