Application of enhanced purification technology for nitrogen and phosphorus removal in low-temperature natural simulated wetland in northern China

doi:10.19965/j.cnki.iwt.2022-0976

Abstract

Abstract:

Aim to strengthen the denitrification and phosphorus removal effect of the wetland system，a multi-habitat natural simulated wetland system with “pretreatment area+main treatment area+post-treatment area” was constructed，and it was supplemented by substrate regulation and slow-release phosphorus removal measures to form an anaerobic/anoxic/aerobic alternate environment. At the same time，the project optimized the packed bed structure，flora/plant configuration and low temperature operation mode of the wetland system to improve the winter operation effect of the wetland system. The results showed that a good microbial environment for denitrification and dephosphorization could be formed inside the multi-habitat natural simulated wetland system，and the phosphorus removal effect of the system could be further improved by supplementary addition of soil/quicklime slow-release phosphorus removal filler. By adopting the technical measures of covering the surface of the packed bed with thermal insulation material and operating at a low water level under low temperature，the temperature under the ice could be controlled at 2-3 ℃，which could further exert the water purification function of low-temperature resistant plants/microbes，comprehensively improving the wetland effluent effect under low temperature conditions. The research results were applied to the natural simulated wetland of Guanting No. 8 Bridge，and achieved the removal effect of 47.78% and 51.67% of TN and TP in the upstream water in the low temperature season. It effectively broken through bottleneck problems，such as the limited purification level of N and P pollutants in traditional wetlands and difficulties in reaching the standard operation of the effluent from the lower wetlands in the low temperature conditions.

Key words: natural simulated wetland, enhanced denitrification, slow-release phosphorus removal, low-temperature operation

摘要：

为强化湿地系统的脱氮除磷效果，构建具有“预处理区+主处理区+后处理区”的多生境仿自然湿地系统，辅以底质调节缓释除磷措施，形成良好的厌氧/缺氧/好氧微生环境，同时为提升湿地系统的冬季运行效果，项目对湿地系统的填料床结构、菌群/植物配置以及低温运行模式进行了优化。结果表明，多生境仿自然系统湿地系统内部能够形成良好的厌氧/缺氧/好氧交替的微生环境，通过辅助添加土壤/生石灰缓释除磷填料，可进一步提高系统的除磷效果；通过采取填料床表层保温材料覆盖、低温冰下低水位运行技术措施，能够将冰下温度控制在2~3 ℃，可进一步发挥耐低温植物/微生物的水质净化功能，综合提升低温条件下的湿地出水效果；研究成果应用于官厅八号桥仿自然湿地，对低温季节上游来水中TN、TP的去除率分别为47.78%、51.67%，有效突破了传统湿地氮、磷污染物净化水平有限、冬季低温条件下湿地出水达标运行困难等瓶颈问题。

关键词: 仿自然湿地, 多生境脱氮, 缓释除磷, 低温运行

CLC Number:

X703.1

Wendong WANG, Lijun WANG, Xiaowei GAO, Xueyan LIU, Yuanyuan LONG, You ZHAO, Tingting CAI, Hui WANG. Application of enhanced purification technology for nitrogen and phosphorus removal in low-temperature natural simulated wetland in northern China[J]. Industrial Water Treatment, 2023, 43(9): 206-212.

王文冬, 王利军, 高晓薇, 刘学燕, 龙元源, 赵佑, 蔡婷婷, 王慧. 北方低温仿自然湿地脱氮除磷强化净化技术应用[J]. 工业水处理, 2023, 43(9): 206-212.

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URL: https://gyscl.magtechjournal.com/EN/10.19965/j.cnki.iwt.2022-0976

https://gyscl.magtechjournal.com/EN/Y2023/V43/I9/206

Figures/Tables 9

Fig. 1 Project location map

Table 1 Monthly water quality status of upstream water before project construction

日期	BOD₅	COD	NH₃-N	TN	TP
总平均	2.4	16.3	0.8	7.9	0.33
2月—4月	3.3	14.8	1.2	10.8	0.32
5月—7月	1.2	15.0	0.4	6.2	0.39
8月—10月	2.7	17.2	0.6	6.0	0.27
11月—1月	2.6	17.8	0.9	8.4	0.35

Table 2 Wetland inlet and outlet water quality indicators

项目	COD	BOD₅	NH₃-N	TP
进水	10~30	1~8	0.1~1.0	0.1~1.0
出水	20	4	1	0.2

Table 3 Different flow guarantee rates of Yongding River from 2006 to 2015

流量/（m³·s^-1）	0.5	1.0	2.0	3.0
保证率/%	92.5	81.7	55.8	36.7

Table 4 Wetland hydraulic parameter design

流量

湿地有效

占地面积/m²

Fig. 2 Wetland system functional zoning layout

Fig. 3 Process flow diagram

Fig. 4 The overall layout of the No. 8 bridge natural simulated wetland

Fig. 5 Water purification effect of natural simulated wetland system

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