Application of constructed wetlands to control rainwater runoff pollution from the water source

doi:10.3969/j.issn.1000-5641.2024.01.006

Abstract

Abstract:

In this study, constructed wetland structures were established using different substrates (gravel and aerated concrete), with or without cannas planting. Subsequently , the effects of different working conditions on rainwater runoff pollution were investigated through small experiments. The cost of the constructed wetland with aerated concrete and cannas (4.20 yuan/working condition) was slightly higher (1.00 ~ 2.90 yuan/working condition higher) than those under other working conditions. However, in both cycles of operation (i.e., alternating operation for 30 h and drying for 48 h), the average removal rates of ${\rm{NH}}_4^+ $-N, ${\rm{NO}}_3^- $-N, TN, ${\rm{PO}}_4^{3-} $, TP and COD_Cr were 73.3%, 47.0%, 85.4%, 56.4%, 76.0%, and 65.5%, respectively. These values were higher than those under other working conditions by an average of 10.9% ~ 18.8%. Thus, this constructed wetland structure had the best effect and the highest cost performance. Therefore, it is suitable for promotion and application.

Key words: drinking water source, rainwater runoff pollution, constructed wetland, non-point pollution source, water supply security

CLC Number:

X506

Ting LIU, Wenxi ZHU, Chengjin CAO, Difang WANG, Haochen DU, Mengzhuo LI, Minsheng HUANG, Yan HE, Yating ZHANG, Xintong LI. Application of constructed wetlands to control rainwater runoff pollution from the water source[J]. Journal of East China Normal University(Natural Science), 2024, 2024(1): 50-57, 156.

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湿地编号	填充基质	植物种植
W1	加气混凝土	无
W2	砾石	无
W3	加气混凝土	美人蕉
W4	砾石	美人蕉

水质指标	雨水径流 EMC 值/(mg·L^–1)	EMC 设计值/(mg·L^–1)	配水浓度/(mg·L^–1)
COD_Cr	100 ~ 800	500	750
TP	0.26 ~ 1.00	0.5	0.75
${\rm{NH}}_4^+ $-N	0.6 ~ 2.6	1.5	2.25
${\rm{NO}}_3^- $-N	0.2 ~ 0.9	0.5	0.75

降雨历时t/min	雨水径流系数Ψ	暴雨重现期P/a	设计流量Q/(mL·min^–1)
60	0.3	1	21.8

基质类型	成本	规格	使用量	总成本/(元/工况)
砾石	0.25 元/kg	3 ~ 5 mm	6 kg/工况	1.30
加气混凝土	4.80 元/块	600 mm × 200 mm × 200 mm (碎渣 8 ~ 10)	2 kg/工况	3.20
美人蕉	0.20 元/根	5 根/株	2 株/工况	1.00

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