Juan Roberto, Hernández Susana, Andrés José M, Ruiz Carmen
Instituto de Carboquímica (CSIC), Miguel Luesma 4, 50018 Zaragoza, Spain.
J Hazard Mater. 2009 Jan 30;161(2-3):781-6. doi: 10.1016/j.jhazmat.2008.04.025. Epub 2008 Apr 15.
The potential value of zeolitic materials (ZM) obtained from a hazardous waste, such as coal fly ash, for the retention of NH(4)(+) present in liquid effluents from a Sewage Treatment Plant (STP) is studied. A wastewater sample was taken from an STP in Zaragoza (Spain) after conventional treatment at the Plant. The water was treated with different amounts of three ZM: NaP1 zeolite, K-F zeolite and K-Chabazite/K-Phillipsite zeolites all of them in powdered and granulated state. The wastewater was treated by two kinds of processes: continuous stirring batch experiments with powdered ZM, and fixed packed bed of granulated ZM in a column. The powdered materials reduced about 80% of NH(4)(+) from wastewater, even in the presence of Ca(2+), which competes with NH(4)(+) for the cation exchange sites in zeolites. Around 70% of NH(4)(+) reduction was achieved with granulated materials. In both cases, moderate ZM/wastewater ratios had to be used to achieve those results, with K-zeolites slightly less effective in NH(4)(+) retention.
研究了从危险废物（如粉煤灰）中获得的沸石材料（ZM）对污水处理厂（STP）液体流出物中存在的NH₄⁺的保留潜在价值。在该工厂进行常规处理后，从西班牙萨拉戈萨的一个污水处理厂采集了废水样本。用不同量的三种ZM处理该水：NaP1沸石、K-F沸石和K-菱沸石/K-丝光沸石，它们均为粉末状和颗粒状。废水通过两种工艺处理：用粉末状ZM进行连续搅拌间歇实验，以及在柱中使用颗粒状ZM的固定填充床。即使在存在与NH₄⁺竞争沸石中阳离子交换位点的Ca²⁺的情况下，粉末状材料也能使废水中约80%的NH₄⁺减少。颗粒状材料实现了约70%的NH₄⁺减少。在这两种情况下，都必须使用适度的ZM/废水比例才能达到这些结果，K-沸石在保留NH₄⁺方面的效果略差。
