Journal
ECOLOGICAL ENGINEERING
Volume 37, Issue 9, Pages 1425-1429Publisher
ELSEVIER
DOI: 10.1016/j.ecoleng.2011.03.029
Keywords
Subsurface wastewater infiltration system; Sewage treatment; Nitrification and denitrification; Hydraulic loading rate
Funding
- Ministry of Science and Technology of the People's Republic of China [2008ZX07208-008-04]
- National Natural Science Foundation of China [50908151, 51008198]
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The subsurface wastewater infiltration (SWI) system proved to be an effective and low-cost technique for decentralized sewage treatment in areas without adequate domestic treatment facilities. Field-scale experiments were conducted through a deep SWI system, with effective depth of 1.5 m, under hydraulic loading rates of 0.040, 0.065, 0.081 and 0.10 m(3)/m(2) d. Taking the hydraulic and treatment efficiencies into consideration, the hydraulic loading rate of 0.081 m(3)/m(2) d was recommended. Under this condition, NH3-N, TN, and COD removal efficiencies were 86.2 +/- 3.0, 80.7 +/- 1.9 and 84.8 +/- 2.1%, respectively. In the effluent. NH3-N concentration declined to 2.3-4.4 mg/L, accounting for 63.2-65.6% of TN. NO3-N concentration increased from 0.2 to 0.3 mg/L in the influent to 2.0-2.5 mg/L in the effluent. The nitrifying bacteria number declined with increased depth, while the amount of denitrifying bacteria increased. The analysis of results about the nitrifying and denitrifying bacteria distribution indicated that the most effective ranges for nitrification and denitrification process were 0.3-0.7 m and 0.7-1.5 m, respectively. (C) 2011 Elsevier B.V. All rights reserved.
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