Characterization of treatment processes and mechanisms of COD, phosphorus and nitrogen removal in a multi-soil-layering system
Characterization of treatment processes and mechanisms of COD, phosphorus and nitrogen removal in a multi-soil-layering system
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DOI：
10.1111/j.1747-0765.2005.tb00025.x
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发表时间：
2005-04-01
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
使用实验室规模的 MSL 系统研究了 MSL 系统内处理过程的特征，该系统设置在 D10 x W50 X H73 cm 的丙烯酸盒子中，其中包含与 I 渗透性沸石层交替的“土壤混合物块”。为了研究系统内部的处理过程，将COD平均浓度（mg L-1）：70、T-N：12、T-P：0.9的废水以1,000 L m(-2) d(-1)的负荷率引入系统。 MSL系统中的COD、P和N污染物的处理过程是不同的。 6层中的第1层土壤中80%的COD被去除，随着水的向下移动，去除率逐渐增加，最终在系统的最后一层达到90%。土壤混合层下的磷浓度低于渗透层下的磷浓度，可能是因为磷主要被土壤和混合铁颗粒吸附。在系统的下层，水中的P浓度逐渐降低。曝气 MSL 系统中 PO43--P 的浓度通常低于非曝气系统中的 PO43--P 浓度。 NH4+-N在系统上部被吸附并硝化。混合土层下水中的NO3--N浓度低于透水层下的NO3--N浓度，表明反硝化作用主要发生在混合土层中。
Characteristics of the treatment processes inside a MSL system were investigated by using a laboratory-scale MSL system, which was set up in a D10 x W50 X H73 cm acrylic box enclosing "soil mixture blocks" alternating with I permeable zeolite layers. For the study of the treatment processes inside the system, wastewater, with mean concentrations (mg L-1) of COD: 70, T-N: 12, T-P: 0.9, was introduced into the system at a loading rate of 1,000 L m(-2) d(-1). Treatment processes in the MSL system were, different for the COD, P and N pollutants. Eighty percent of COD was removed in the 1st soil layer among the 6 layers, and the removal rate increased as water moved down and finally reached 90% in the last layer of the system. Phosphorus concentration was lower under the soil mixture layers than under the permeable layers, presumably because P was adsorbed mainly by soil and mixed iron particles. The P concentration in water gradually decreased in the lower layers of the system. The concentration of PO43--P was generally lower in the aerated MSL system than in the non-aerated one. NH4+-N was adsorbed and nitrified in the upper part of the system. The NO3--N concentration was lower in water under the soil mixture layers than under the permeable layers, indicating that denitrification mainly occurred in the soil mixture layers.