建筑废弃物对水体有机物和总磷的去除效果及作用方式

Removal effect and mode of organic matter and total phosphorus in water body by construction waste

文章通过研究加气块、混凝土、砂浆和红砖4种建筑废弃物对水体有机物和总磷(TP)的去除效果和作用方式发现:4种建筑废弃物均可实现水体中有机物和TP的去除,其中加气块(平均去除率>50%,去除量达0.33 mg/g)和红砖(平均去除率>35%,去除量达0.22 mg/g)具有较高的有机物去除效果,砂浆(平均去除率>70%,去除量达0.018 mg/g)和加气块(平均去除率超过45%,去除量达0.013 mg/g)具有较高的TP去除效果;4种建筑废弃物均可能通过水合有机物物理吸附的方式去除有机物,加气块、混凝土、砂浆可能通过磷酸钙类沉淀生成型化学吸附方式去除TP,红砖可能通过磷酸铝类表面络合型化学吸附方式去除TP。该研究有助于深化建筑废弃物用于水污染控制的机理认知并帮助改进其技术参数。

By studying the removal effect and action mode of four kinds of construction wastes,namely aerated block,concrete,mortar and red brick,it is found that all four kinds of construction wastes can remove organic matter and total phosphorus(TP)in water,among which aerated block(average removal rate>50%,removal amount is 0.33 mg/g)and red brick(average removal rate>35%,removal amount is 0.22 mg/g).Mortar(average removal rate>70%,removal amount up to 0.018 mg/g)and aerated block(average removal rate over 45%,removal amount up to 0.013 mg/g)have higher TP removal effect.All four kinds of construction waste may remove organic matter by physical adsorption of hydrated organic matter,aerated block,concrete and mortar may remove TP by precipitation-generating chemical adsorption of calcium phosphate,and red brick may remove TP by surface complexation chemical adsorption of aluminum phosphate.It is helpful to deepen the understanding of the mechanism of construction waste used in water pollution control and help improve its technical parameters.