厩肥对粉煤灰宏观元素释放规律影响的研究

Effects of Cattle Manure on Release of Macro- Elements in Bottom Ash

通过淋洗试验研究了粉煤灰中宏观元素的活化过程。试验结果显示,粉煤灰与厩肥的混合明显地降低了淋出液的pH以及Ca,Al和Si的浓度,但增大了EC(电导率)以及K,Mg,Na,S,P和Fe的浓度。其混合物的孵化处理显著地增大了初始淋出液的EC以及Ca,Mg,K和S的浓度。在2个孔隙体积内,从处理1～4(即粉煤灰,粉煤灰与石灰混合物,粉煤灰、石灰与厩肥混合物及其孵化)中淋洗出的可溶盐分别占它们各自总淋溶盐量的29.1%,53%,71.8%和78.2%。因此,对粉煤灰与厩肥混合物或其堆肥进行初步淋洗处理后再应用于农田,将有效地减小粉煤灰处理与应用对水土环境的影响和冲击。

Disposal and reutilization of bottom ash from power plant is one of the main problems in environmental conservation. The activation and release process of major elements in bottom ash was studied under leaching conditions. The experimental treatments were: bottom ash; the mixture of bottom ash and lime; the mixture of bottom ash, lime and cattle manure as well as its different incubation periods. The experimental data indicated that the mixture of bottom ash with cattle manure remarkably decreased both pH values, and concentrations of Ca, Al, and Si, but increased EC and concentrations of K, Mg, Na, S, P and Fe in the leachate. Furthermore, the incubation treatment of the mixture greatly increased initial EC and concentrations of Ca, Mg, K, and S in the leachate. Within the first 2 volumes, the released soluble salts in leachate accounted for 29.1, 53, 71.8 and 78.2% of the total dissolved salts in Treatments 1 ( 4, respectively. Therefore, it may be suggested that the influence and impact of bottom ash application and disposal process on environment be effectively eliminated or reduced, if the mixture of bottom ash with the cattle manure or their compost is preliminarily leached before it is applied to farmland.