农业环境科学学报2011，Vol.30Issue(4)：733-738,6.
斜发沸石吸附NH4+-N的活化与再生方法研究
NH4+-N Adsorption and Regeneration of Activated Clinoptilolite
摘要
Abstract
A type of suitable clinoptilolite media was used in constructed rapid infiltration system to remove ammonia-N. The mechanisms for ammonia-N adsorption by clinoptilolite, activation of clinoptilolite and regeneration of clinoptilolite were systematically studied. The adsorption isotherm curve of ammonia-N on clinoptilolite was well described by the Langmuir equation:q=0.076 4 Ce/( 1 +0.032 8 Ce). The ammonia-N removal rate of different activation methods on activated clinoptilolite was in the following order: thermalization clinoptilolite ＞ Natype clinoptilolite＞P- type clinoptilolite＞H-type clinoptilolite＞natural clinoptilolite. Compared to other activation methods, thermalization activation resulted in the best adsorption capacity enhancement which was 26.24％ higher than non-activated one. Saturated clinoptilolite could be regenerated by stripping without noticeable loss of capacity. The efficiency of desorption of ammonia-N reached 80.98％ and 65.37％ respectively after twice regeneration, but the efficiency of desorption of ammonia-N sharply decreased after multi- regeneration. Under ratio of water to solid of 25, hydraulic loading of 1.2 m3·m-2·h-1, HRT = 0.5 h and the influent concentration of 3.5～4 mg· L-1, the effluent concentration was better than the class IV of national surface water environmental quality standards (ammonia-N ≤ 0.5 mg· L-1). When water-soil ratio was 96, the adsorption of ammonia-N was saturated. Effect of different hydraulic loading and different column heights were also systematically studied. The experimental results showed that the clinoptilolite was suitable for the removal of NH4+-N in wastewater and with good prospects for application.关键词
斜发沸石/NH4+-N/离子交换吸附/穿透曲线/再生Key words
clinoptilolite/ NH4+-N/ ion exchange/ breakthrough curve/ regeneration分类
资源环境引用本文复制引用
陈辉霞,刘翔..斜发沸石吸附NH4+-N的活化与再生方法研究[J].农业环境科学学报,2011,30(4):733-738,6.基金项目
国家水体污染控制与治理科技重大专项"老城区水环境污染控制及质量改善技术研究与示范"(2008ZX07313-001) （2008ZX07313-001）
