Adsorption and recovery of nitrogen and phosphorus in yellow water by natural clinoptilolite and human manure biochar

doi:10.19965/j.cnki.iwt.2024-0596

Abstract

Abstract:

To achieve efficient resource recovery of nitrogen and phosphorus nutrients from yellow water, this study selected natural clinoptilolite and human manure-based biochar as adsorbents. The research systematically investigated the effects of adsorbent dosage and particle size on the adsorption efficiency of nitrogen and phosphorus in yellow water. Furthermore, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were employed to characterize the structural and chemical properties of the adsorbents before and after adsorption. The results showed that both adsorbents could effectively reduce the pH, electrical conductivity, and total dissolved solids (TDS) of yellow water, while also demonstrating certain adsorption capacity for total organic carbon (TOC). Clinoptilolite exhibited strong selective adsorption for NH₄ ⁺-N, and its phosphorus adsorption efficiency increased with higher dosages. The manure-based biochar showed superior nitrogen and phosphorus adsorption performance compared to clinoptilolite, achieving adsorption rates of 78.14%, 79.26%, and 80.48% for NH₄ ⁺-N, TP, and PO₄ ^3--P, respectively. Particle size of clinoptilolite had minimal influence on adsorption performance, with the 50-60 mesh range showing optimal results under experimental conditions. Post-adsorption analysis detected various new organic compounds and nitrogen/phosphorus-containing inorganic salts on the adsorbent surfaces, confirming their adsorption capabilities. The nitrogen-phosphorus loaded clinoptilolite and manure-based biochar can not only serve as slow-release fertilizers for agricultural production but also further promote the resource utilization of yellow water.

Key words: natural clinoptilolite, human manure biochar, yellow water, nitrogen and phosphorus

摘要：

为实现黄水中氮磷等营养物质的高效资源化，选用天然斜发沸石和人粪生物炭作为吸附剂，探究吸附剂投加量、粒径对黄水中氮磷吸附效果的影响，并利用X射线衍射（XRD）与傅里叶变换红外光谱（FTIR）对吸附前后的吸附剂进行表征。结果表明：两种吸附剂均能有效降低黄水的pH、电导率以及溶解性总固体（TDS），对总有机碳（TOC）也有一定的吸附效果。斜发沸石对NH₄ ⁺-N具有较强的选择性吸附优势，对磷的吸附率则随着投加量的增大而升高；粪基生物炭对氮磷的吸附性能优于斜发沸石，对NH₄ ⁺-N、TP、PO₄ ^3--P的吸附率分别可达78.14%、79.26%、80.48%。斜发沸石粒径对吸附效果的影响较小，实验条件下粒径为50~60目时的吸附性能最佳。吸附处理后，在吸附剂表面检测到多种新的有机物及含氮、磷无机盐，证实了两种吸附剂对黄水中的氮磷具有吸附能力。吸附氮磷后的斜发沸石和粪基生物炭不仅可作为缓释肥用于农业生产，还可进一步推动黄水的资源化利用。

关键词: 天然斜发沸石, 人粪生物炭, 黄水, 氮磷

CLC Number:

X703.1

Yanmei YANG, Yuanyang LÜ, Ke CHEN, Jinyuan JIANG, Yajun LI. Adsorption and recovery of nitrogen and phosphorus in yellow water by natural clinoptilolite and human manure biochar[J]. Industrial Water Treatment, 2025, 45(8): 104-112.

杨延梅, 吕远洋, 陈可, 蒋进元, 李雅君. 天然斜发沸石和人粪生物炭吸附回收黄水中氮磷[J]. 工业水处理, 2025, 45(8): 104-112.

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URL: https://gyscl.magtechjournal.com/EN/10.19965/j.cnki.iwt.2024-0596

https://gyscl.magtechjournal.com/EN/Y2025/V45/I8/104

Figures/Tables 7

Fig.1 Effect of adsorbent dosage on pH，EC，TDS and TOC of yellow water

Fig.2 Effect of clinoptilolite dosage on the adsorption of nitrogen and phosphorus in yellow water

Fig.3 Effect of manure-based biochar dosage on the adsorption of nitrogen and phosphorus in yellow water

Fig.4 Effect of particle size of clinoptilolite on pH，EC，TDS and TOC of yellow water

Fig.5 Effect of clinoptilolite particle size on nitrogen and phosphorus adsorption in yellow water

Fig.6 XRD spectra of adsorbent before and after adsorption

Fig.7 FTIR spectra of adsorbent before and after adsorption

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