Title: Impact of nitrogen loading rates on nitrogen transformation for anaerobic effluent from latex processing industry

Authors: Do Thi Thuy Phuong; Bui Xuan Thanh; Nguyen Phuoc Dan

Addresses: Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet St., Dist. 10, Ho Chi Minh City, Vietnam. ' Faculty of Environment, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet St., Dist. 10, Ho Chi Minh City, Vietnam. ' Faculty of Environment, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet St., Dist. 10, Ho Chi Minh City, Vietnam

Abstract: This study evaluated the influence of nitrogen loading rates on fate of nitrogen treating anaerobic effluent from latex processing industry using a novel acryl-fibre biomass carrier-bio-fringe (BF) in a swim-bed reactor. At NLR of 0.5 kg N/m³.day, 60% to 70% TKN was converted and the nitrogen ratio N-NO2 / (NO2 + NO3) reached 80% to 90%. At NLR of 1 kg N/m³.day, conversion efficiency of TKN increases by 80% to 95% and the ratio reached 80% to 95%. However, this ratio decreased by 40% to 60% due to the influent alkalinity reduction. At increased NLR of 1.5-2 kg N/m³.day, nitrite and nitrate reduced less than 20 mg N/L. This is due to an increase in NLR and amount of alkalinity available. Reactor pH as high as 8.2-8.6 produced high free ammonia (FA) concentration restricting nitrite production. The COD removal efficiencies were 80-90% and 85-95% at NLR of 0.5-1 kg N/m³.day, respectively. This reduced 75-88% at an increased NLR of 1.5-2 kg N/m³.day.

Keywords: nitritation; swim-bed reactors; nitrogen loading rates; NLR; acryl-fibre biomass carrier biofringe; anaerobic effluent; latex wastewater; wastewater treatment; COD removal; chemical oxygen demand.

DOI: 10.1504/IJGENVI.2012.049372

International Journal of Global Environmental Issues, 2012 Vol.12 No.2/3/4, pp.179 - 189

Received: 17 Jan 2011
Accepted: 12 Sep 2011

Published online: 02 Oct 2012 *

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