Investigation on the adsorption and denitrification performance of modified reed material and its resource utilization

doi:10.19965/j.cnki.iwt.2023-0798

Abstract

Abstract:

In order to explore the resource utilization of nitrate nitrogen in wastewater and the high-value utilization mode of excess reed resources in Baiyang Lake, this paper prepared modified reed straw(MRS) with waste reed straw(RS) as raw material. Through adsorption desorption regeneration experiments, MRS recycling application experiments and SEM, XPS, FT-IR characterization methods, the potential use of MRS in the removal of nitrate nitrogen in wastewater and its recycling was explored. The results showed that the maximum adsorption capacity of MRS for nitrate was 8.54 mg/g, and its adsorption behavior was in line with the Freundlich adsorption isotherm model. The adsorption process was more in line with the pseudo second-order adsorption kinetics model. After 9 adsorption-desorption-regeneration cycles, the adsorption performance of the adsorbent did not significantly decrease, the material adsorbing nitrate nitrogen(MRS-NO₃ ^-) used as fertilizer played a significant role in promoting plant growth, and the pH of the experimental soil did not change. In conclusion,MRS is a low-cost, efficient and harmless nitrate adsorbent. This study preliminarily realized the resource utilization of nitrate nitrogen in wastewater and the high-value utilization mode of excess reed resources in Baiyang Lake through the technical route of adsorption-desorption-regeneration-recycling.

Key words: reed straw, resource utilization, adsorbent, wastewater, nitrate nitrogen

摘要：

为了探究废水中硝酸盐氮的资源化协同白洋淀过剩芦苇资源的高值化利用模式，以芦苇秸秆（Reed straw，RS）为原材料制备胺化改性芦苇秸秆（Modified reed straw，MRS），通过吸附-解吸-再生实验、MRS资源化应用实验和SEM、XPS、FT-IR等表征手段，探究了MRS在去除废水中硝酸盐氮及其资源化方面的潜在用途。结果表明，MRS对硝酸盐氮的最大吸附量为8.54 mg/g，其吸附行为符合Freundlich吸附等温模型，吸附过程更符合拟二级吸附动力学模型，经过9次吸附-解吸-再生循环试验后吸附剂的吸附性能没有明显下降，将吸附硝酸盐氮的MRS（MRS-NO₃ ^-）用作肥料对植株生长起到了明显的促进作用，实验土壤的pH无变化。综上，MRS是一种低成本高效无害的硝酸盐吸附剂，通过吸附-解吸-再生-资源化技术路线初步实现了废水中硝酸盐氮的资源化协同白洋淀过剩芦苇资源的高值化利用模式。

关键词: 芦苇秸秆, 资源化, 吸附剂, 废水, 硝酸盐氮

CLC Number:

TQ424

Changyi LIU, Jiawang TIAN, Haodong ZHANG, Zhe QIN. Investigation on the adsorption and denitrification performance of modified reed material and its resource utilization[J]. Industrial Water Treatment, 2024, 44(8): 122-132.

刘畅益, 田佳旺, 张浩东, 秦哲. 改性芦苇材料的吸附脱氮性能及其资源化探究[J]. 工业水处理, 2024, 44(8): 122-132.

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URL: https://www.iwt.cn/EN/10.19965/j.cnki.iwt.2023-0798

https://www.iwt.cn/EN/Y2024/V44/I8/122

Figures/Tables 19

References 39

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组别	实验条件
空白组	不加吸附剂
对照组	加入12 g MRS
实验组一	加入12 g硝酸盐氮吸附量为3 mg/g的MRS-NO₃ ^-
实验组二	加入12 g硝酸盐氮吸附量为5 mg/g的MRS-NO₃ ^-

组别	实验条件
空白组	不加吸附剂
对照组	加入12 g MRS
实验组一	加入12 g硝酸盐氮吸附量为3 mg/g的MRS-NO₃ ^-
实验组二	加入12 g硝酸盐氮吸附量为5 mg/g的MRS-NO₃ ^-

材料	元素	质量分数/%	原子数分数/%
RS	C	54.43	61.41
	N	0.31	0.30
	O	45.18	38.26
	Cl	0.07	0.03
MRS	C	57.15	65.41
	N	1.28	1.25
	O	36.51	31.37
	Cl	5.06	1.96
MRS-NO₃ ^-	C	53.09	59.82
	N	4.28	4.13
	O	42.06	36.03
	Cl	0.03	0.01

材料	元素	质量分数/%	原子数分数/%
RS	C	54.43	61.41
	N	0.31	0.30
	O	45.18	38.26
	Cl	0.07	0.03
MRS	C	57.15	65.41
	N	1.28	1.25
	O	36.51	31.37
	Cl	5.06	1.96
MRS-NO₃ ^-	C	53.09	59.82
	N	4.28	4.13
	O	42.06	36.03
	Cl	0.03	0.01

温度/℃	Langmuir模型			Freundlich模型
温度/℃	q _max/（mg·g^-1）	K _L	R ²	n	K _F	R ²
15	8.54	0.139	0.976	2.29	1.69	0.998
25	8.43	0.143	0.976	2.43	1.78	0.996
35	8.76	0.122	0.976	2.31	1.66	0.997

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