改良填料折流式生物滞留系统对雨水中氮磷削减的效果

冉阳; 付峥嵘; 马满英; 王冶; 叶青勇

doi:10.12153/j.issn.1674-991X.20210290

改良填料折流式生物滞留系统对雨水中氮磷削减的效果

doi: 10.12153/j.issn.1674-991X.20210290

冉阳^1,,
付峥嵘^1, ,,
马满英¹,
王冶¹,
叶青勇²

1.
湖南工业大学土木工程学院
2.
湖南智谋规划工程设计咨询有限责任公司

基金项目: 湖南省株洲市科技计划基金资助项目（No.2020-022）；湖南省株洲市科技计划基金资助项目（No.2019-022）

详细信息

作者简介:
冉阳(1997—)，男，硕士研究生，研究方向为海绵城市生物滞留技术，2499533280@qq.com

通讯作者:
付峥嵘(1974—)，男，副教授，博士，研究方向为绿色建筑、海绵城市生物滞留技术，441680332@qq.com

中图分类号: X52,TU992
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- 被引次数: 0
出版历程
- 收稿日期: 2021-07-05
- 网络出版日期: 2022-07-15

Effect of amended filler fold-flow bioretention system on nitrogen and phosphorus reduction in rainwater

1.
School of Civil Engineering, Hunan University of Technology
2.
Hunan Zhimou planing engineering design consultation Co., Ltd

摘要

摘要:
针对生物滞留池对雨水中氮、磷去除效果不稳定，甚至出现负去除现象，开展改良生物滞留系统的研究。通过构建直流式和折流式2种生物滞留系统，分别填充传统填料、羟基铝蛭石污泥颗粒（HAVSP）改良填料，搭建传统填料直流式生物滞留柱（1#）、改良填料直流式生物滞留柱（2#）、改良填料折流式生物滞留柱（3#）3个模拟试验柱；比较了3个模拟试验柱对雨水中氮、磷的去除效果，并探讨了羟基铝蛭石污泥对生物滞留填料的改良作用。结果表明：HAVSP改良填料折流式生物滞留系统对氮、磷的削减效果比传统填料和改良填料直流式生物滞留系统的削减效果更加明显，且在350 mm淹没出流高度时对氮、磷削减效果最佳，总氮和硝态氮去除率最高可达76%和77%。
- 生物滞留系统 /
- 改良填料 /
- 直流式 /
- 折流式 /
- 脱氮 /
- 除磷
Abstract:
The study on the amended bioretention systems was conducted in view of the instability and even the negative removal of N, P in rainwater by the bioretention tanks. By constructing two systems of straight-flow and fold-flow bioretention, traditional fillers and hydroxy-aluminium vermiculite sludge particle (HAVSP) were filled respectively. Three simulation test device columns were set up, of which Number1 was a traditional filling straight-flow bioretention column, Number2 was a modified filling straight-flow bioretention column, and Number3 was a modified filling fold-flow bioretention column. The removal effect of nitrogen and phosphorus in rainwater under three simulated experimental devices was compared, and the improvement effect of hydroxy-aluminium vermiculite sludge on bioretention filler was discussed. The results showed that the reduction effect of nitrogen and phosphorus in HAVSP amended filler fold-flow bioretention system was more obvious than that in conventional filler and amended filler straight-flow bioretention system, and had the best effect on nitrogen and phosphorus reduction when the outflow height was 350 mm, with total nitrogen and nitrate-nitrogen removal rates up to 76% and 77%, respectively.
- bioretention system /
- amended filler /
- straight-flow /
- fold-flow /
- nitrogen removal /
- phosphorus removal

HTML全文

图 1 生物滞留试验柱及剖面图

注：图中数字为试验柱尺寸，mm。

Figure 1. Biological retention test column numbering and profile

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图 2 1#和2#试验柱出水不同形态氮与总磷浓度及去除率

Figure 2. Concentrations and removal rates of different forms of nitrogen and total phosphorus of 1# and 2# test column effluent

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图 3 3#试验柱不同淹没出流高度出水各形态氮与总磷浓度及去除率

Figure 3. Concentrations and removal rates of different forms of nitrogen and total phosphorus in effluent at different submerged outflow heights of 3# test column

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图 4 HAVSP扫描电镜图

Figure 4. SEM image of HAVSP

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图 5 红外光谱和XRD表征

Figure 5. FTIR spectra and XRD images of HAVSP

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表 1 生物滞留试验柱内填充的物质

Table 1. Materials filled in bioretention test column

结构	厚度/ mm	传统填料生物滞留池	改良填料生物滞留池
覆盖层	70	树皮和有机质	树皮和有机质
种植土壤	250	校园绿化带土壤	校园绿化带土壤
填料层（上层）	450	沙子	石英砂
填料层（下层）	200	沙子	90%沙+5%木屑+5%HAVSP
砂滤层	90	粗砂（直径1~2 cm）	粗砂（直径1~2 cm）
排水层	100	砾石（直径12~35 mm）+DN25穿孔管	砾石（直径12~35 mm）+DN25穿孔管

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表 2 模拟雨水的污染物来源及浓度

Table 2. Sources and concentrations of pollutants in simulated rainwater mg/L　

进水浓度	水质指标
进水浓度	总氮（TN）	氨氮（NH₃-N）	硝态氮（NO₃-N）	总磷（TP）
低浓度	4	1	1	1
中浓度	8	2	2	2
高浓度	16	4	4	4

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表 3 HAVSP主要元素组成

Table 3. Main element composition of HAVSP

元素	质量百分比/%	质量百分比偏差/%	原子百分比/%	元素	质量百分比/%	质量百分比偏差/%	原子百分比/%
Fe	6.12	0.14	1.75	P	0.07	0.03	0.03
Al	8.21	0.08	4.86	N	0.00	0.52	0.00
Si	10.42	0.09	5.93	C	41.32	0.32	54.96
Ca	0.08	0.03	0.03	O	31.50	0.24	31.46

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