Water movement characteristics in a multi-soil-layering system
Water movement characteristics in a multi-soil-layering system
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DOI：
10.1111/j.1747-0765.2005.tb00009.x
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发表时间：
2005-02-01
影响因子：
2
通讯作者：
Wakatsuki, T
中科院分区：
文献类型：
--
作者：
Sato, K;Masunaga, T;Wakatsuki, T
多层土壤（MSL）系统由以砖状模式排列的土壤单元组成，这些单元被沸石层或具有均匀尺寸的交替颗粒层所包围，从而允许高水力加载率。采用实验室规模的MSL系统（D10 x W50 x H73 cm），研究了MSL系统处理废水过程中水运动、水力停留时间（HRT）和系统重量的变化特征。随着加载速率从1,000 L m(-2) d（-1）增加到5,500 L m(-2) d(-1)，废水优先流入MSL的透水层，这减少了废水与土壤混合层的接触。HRT与负荷率呈负相关。随着加载速率从250 L m(-2) d（-1）增加到6000 L m(-2) d(-1)， HRT从20 h减少到1 h。在污水处理过程中，确定了系统的权重变化，作为系统状态的指标。当重量稳定时，废水的输入输出和有机物的分解呈现平衡状态。当重量增加时，系统开始堵塞。由于堵塞，COD和磷的去除率降低，而硝酸盐的去除率提高。
The Multi-Soil-Layering (MSL) system consists of soil units arranged in a brick-like pattern that are surrounded by layers of zeolite or alternating particles with a homogeneous size that allow a high hydraulic loading rate. Characteristics of the changes in the water movement, hydraulic retention time (HRT) and system weight during the wastewater treatment in the MSL system were investigated using a laboratory-scale MSL system (D10 x W50 x H73 cm). As the loading rate increased from 1,000 to 5,500 L m(-2) d(-1), wastewater preferentially flowed into the permeable layers in the MSL, which decreased the contact of the wastewater with the soil mixture layers. HRT was inversely related to the loading rate. HRT decreased from 20 to 1 h, as the loading rate increased from 250 to 6,000 L m(-2) d(-1). As an indicator of the system condition, the weight variation of the system was determined during the wastewater treatment. When the weight was stable, input and output of wastewater and decomposition of organic matter appeared to be equilibrated. When the weight increased, the system started to clog. Due to clogging, the efficiency of COD and phosphorus removal decreased, while the efficiency of nitrate removal increased.