High nitrate nitrogen inorganic wastewater treatment process based on microalgae
MEI Hong1,2， FENG Qianqian1,2， CHENG Kai1,2， ZHANG Guang1,2
(1.College of Civil and Environmental Engineering， Hubei University of Technology， Wuhan 430068， China； 2. Hubei Key Laboratory of Ecological Restoration for River-Lakes and Algal Utilization， Hubei University of Technology， Wuhan 430068， China)
Abstract：In view of the high cost of carbon source and increased carbon emission associated with traditional denitrification processes for treating high nitrate-nitrogen inorganic wastewater， this study aims to reduce treatment costs. Focusing on high nitrate-nitrogen inorganic wastewater from a seamless steel pipe factory， this research employs microalgae-based water treatment technology for pollution reduction and carbon sequestration. It compares the treatment effectiveness of different microalgae， explores the adsorption-regeneration treatment process based on microalgae， and assesses the feasibility of microalgae resource utilization. The results showed that Chlorella FACHB-09 had the best treatment effect on steel pipe wastewater with a nitrate nitrogen concentration of 700 mg·L－1. After four rounds of adsorption and regeneration， the nitrate nitrogen concentration could be reduced to 42 mg·L－1 within 19 days， and 6.6 g dry algae with lipid and protein contents of 26% and 20% respectively could be produced per liter of sewage. The above results show that the application of adsorption-regeneration process based on microalgae can effectively remove nitrate nitrogen from sewage and greatly increase the economic benefits of wastewater denitrification.
2025, Vol. 59 
