沸石芦苇床除氮中试研究

对沸石芦苇床去除农田回归水和农村生活污水组成的混合污水中的氮进行了中试研究.结果表明,在0.6m/d的水力负荷下,系统对总氮、氨氮、硝酸盐氮、亚硝酸盐氮的平均去除率冬季和春季分别为38.9%和58.2%,93.11%和78.84%,10.01%和48.99%,38.81%和98.45%.春季运行效果明显好于冬季.在相同条件下,总氮、氨氮、硝酸盐氮去除率比砾石芦苇床分别高28%、67%、35%.沸石对氨氮的吸附、离子交换,微生物的哪硝化、反硝化作用是沸石芦苇床系统去除氮的主要途径.

Nitrogen Removal in a Pilot-Scale Zeolite Reed Bed System

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.