In this study, the nitrogen removal efficacy of a pilot-scale zeolite reed bed system was tested for the treatment of agricultural wastewater and domestic wastewater etc. At a mean hydraulic loading of 0.6 m/d, the total nitrogen, ammonia, nitrate, nitrite in winter and spring were reduced across the system by 38.9% and 58.2%, 93.11% and 78.84%, 10.01% and 48.99%, 38.81% and 98.45%, respectively. The system performance in spring was much better than in winter. Under the same conditions, the total nitrogen, ammonia, nitrate removal rate of zeolite reed bed were 28%, 67%, 35% higher than that of gravel reed bed. The ammonia adsorption and ion exchange on zeolite and biological nitrogen removal through nitrification and denitrification were the main removal mechanism of nitrogen in the zeolite reed bed.
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