不同回灌堆体和回灌方式对纳滤浓缩液回灌效果的影响

Influence of Different Recirculating Pile and Recirculation Way on Recirculation Effect of Nanofiltration Concentrated Liquor

分别以4 a的老龄垃圾和焚烧厂产生的灰渣为堆体,采用水平和垂直2种回灌方式,研究工程中最适合的回灌参数。结果表明:老龄垃圾堆体中的微生物降解进水中部分COD,使得出水COD有所下降。而炉渣堆体中对进水只有一定的物理截留作用。炉渣堆体对于NH4+有着吸附和离子交换的作用,导致初期出水的NH3-N较低。同时,炉渣堆体的回灌出水中电导率较高,影响后续产生的渗沥液的处理。在回灌方式方面,水平回灌虽然进水的停留时间较长,但是出水的COD和电导率没有太大的变化,NH3-N反而升高。

Taking aged waste with four years and slag from one waste incineration plant as the pile, using horizontal and vertical recirculation ways, the most suitable recirculation parameters were studied. The results showed that microorganism in aged waste file degraded part of COD in the influent to make COD in the effluent fallen, and slag pile only played a certain role of physical interception for the influent. Slag pile also played the roles of adsorption and ion exchange for NH4~ to lead to low concentration of NH3-N of effluent in the initial stage. At the same time, the recirculation effluent of slag pile had higher conductivity to influence the subsequent leachate treatment. In the recireulation ways, although the influent of horizontal recirculation had longer residence time, there was not much change in COD and conductivity of the effluent, and NH3-N rose instead.