Alternating nitrification-denitrification via nitrite for nitrogen removal from soybean wastewater by SBR with real-time control

Article type: Research Article

Authors: WANG, Shu-ying | GAO, Da-wen^; | PENG, Yong-zhen | WANG, Peng | YANG, Qing

Affiliations: Department of Environmental Engineering, Beijing Polytechnic University, Beijing 100022, China | School of Municipal & Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China | College of Forest Resources and Environment, Northeast Forestry University, Harbin 150040, China

Note: [] Corresponding author. E-mail: [email protected]; [email protected].

Abstract: A novel treating technology for nitrogen removal from soybean wastewater was studied. The process for nitrogen removal was achieved by alternating aeration and mixing, combined with real-time control strategies. Results showed that the COD and total nitrogen removal rates are more than 90% and 92% at COD and total nitrogen loads of 1.0–1.2 kg COD/(kgMLSS ˙ d) and 0.20–0.27 kg TN/(kgMLSS ˙ d), respectively. In addition, it could improve sludge setting property. SVI value is less than 70 g/ml during the whole cycles. The method not only may be adapted to treat soybean wastewater with high nitrogen, but also may be applied to treat other high nitrogen wastewater.

Keywords: fuzzy control, nitrification, nitrite, ORP, pH, SBR

Journal: Journal of Environmental Sciences, vol. 16, no. 3, pp. 380-383, 2004