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1 材料和方法
1.1 模拟装置构建
Table 1 Filling method for matrix layer in infiltration column
基质层级 | 填充方式 | 填充高度/cm | 设计依据 | |||
1#渗滤柱 | 2#渗滤柱 | 3#渗滤柱 | 4#渗滤柱 | |||
吸附层 | 沸石:蛭石:煤渣=3:3:4(体积比), 分层填装 | 沸石: 蛭石:煤渣=3:3:4(体积比),混合填装 | 沸石: 蛭石:陶粒=3:3:4(体积比),分层填装 | 沸石: 蛭石:陶粒=3:3:4(体积比),混合填装 | 45 | 过滤进水中的悬浮颗粒,吸附氮、磷,增大装置渗透速度,为微生物生长提供空间、养料,同时保证渗透性能防止上层填充物堵塞出水孔 |
渗滤层 | 以草甸棕壤:煤渣:膨润土:稻壳=16:4:1:1(体积比)进行填充 | 75 | ||||
集水层 | 细砂、鹅卵石 | 细砂、鹅卵石 | 细砂、鹅卵石 | 细砂、鹅卵石 | 5 |
Fig. 1 Schematic diagram of infiltration columns
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1.2 供试雨水
1.3 装置运行
1.4 水质分析方法
2 结果与讨论
2.1 渗滤柱持水能力和渗透速度
Table 2 Maximum water holding capacity and average infiltration velocity of each infiltration column
渗滤柱编号 | 最大持水量/% | 平均渗透速度 /(mm·d−1) |
1# | 33.10 | 2 154 |
2# | 32.59 | 1 400 |
3# | 39.73 | 2 992 |
4# | 32.59 | 2 903 |
2.2 渗滤柱对污染物的去除效果
2.2.1 渗滤柱对NH4+-N的去除效果
Fig. 2 Change of NH4+-N concentration with time at different outlet of each infiltration column
Fig. 2 Change of NH4+-N concentration with time at different outlet of each infiltration column
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Fig. 3 NH4+-N concentration at final outlet of each infiltration column
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2.2.2 渗滤柱对TP的去除效果
Fig. 4 Change of TP concentration with time at different outlet of each infiltration column
Fig. 4 Change of TP concentration with time at different outlet of each infiltration column
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Fig. 5 Concentration of TP at final outlet of each infiltration column
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Table 3 Average concentration and removal rate of TP in effluent from infiltration column
渗滤柱编号 | TP去除率/% | 出水口4出水浓度/(mg·L−1) |
1# | 98.13 | 0.075 |
2# | 98.59 | 0.056 |
3# | 98.44 | 0.063 |
4# | 95.63 | 0.175 |
2.2.3 渗滤柱对COD的去除效果
Fig. 6 Change of COD concentration with time at each outlet of infiltration columns 2 and 3
Fig. 6 Change of COD concentration with time at each outlet of infiltration columns 2 and 3
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Fig. 7 Removal rates of COD of each infiltration column
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