聚合硫酸铁和聚丙烯酰胺对藻泥水热炭特征的影响及产物应用潜力

王怡梦; 梁韵仪; 陈丙法; 马亚鑫; 周紫瑜; 何世颖; 谢慧芳; 薛利红; 冯彦房

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中国环境科学 ›› 2025, Vol. 45 ›› Issue (5) : 2587-2597.

固体废物

聚合硫酸铁和聚丙烯酰胺对藻泥水热炭特征的影响及产物应用潜力

王怡梦^1,2, 梁韵仪^2,3, 陈丙法², 马亚鑫^1,2, 周紫瑜¹, 何世颖², 谢慧芳¹, 薛利红², 冯彦房²

作者信息 +

Effects of polyferric sulfate and polyacrylamide on algal mud-based hydrochar and their application potential

WANG Yi-meng^1,2, LIANG Yun-yi^2,3, CHEN Bing-fa², MA Ya-xin^1,2, ZHOU Zi-yu¹, HE Shi-ying², XIE Hui-fang¹, XUE Li-hong², FENG Yan-fang²

Author information +

文章历史 +

摘要

以太湖藻泥为研究对象,选择聚合硫酸铁(PFS)和聚丙烯酰胺(PAM)两种常见絮凝剂,分别在180?220和260℃条件下制备得到不同水热炭.结果表明,随着水热温度升高,藻泥水热炭中碳含量增加,氢和氮含量减少,水热反应过程中脱羧和水解反应占主导地位.PFS的加入使水热炭中铁含量显著提高519.6%~748.3%,并且水热温度升高可使铁的形态由Fe(Ⅲ)逐渐向Fe(Ⅱ)转变,从而增加铁的还原性.PAM在较低温度即发生降解,生成含氧官能团,而PFS则促进了有机质的降解和碳化过程.180℃制备的藻泥基水热炭养分含量较高,水稻种植实验表明,施用藻泥基水热炭不会对水稻生长产生不利影响,其中PAM水热炭可以使水稻植株生物量增加9.0%.基于实地调研数据估算,太湖藻泥转化为水热炭,每年可回收总氮549.8t,总磷130.9t;其中总磷回收量占环太湖河流入湖磷负荷的7.3%.

Abstract

Using Taihu algal mud as the research subject, two common flocculants, polymeric ferric sulfate (PFS) and polyacrylamide (PAM), were selected to prepare different hydrochars at 180℃, 220℃, and 260℃. The results demonstrated that as the hydrothermal temperature increased, the carbon content in the algal mud hydrochar increased, while the hydrogen and nitrogen contents decreased. Decarboxylation and hydrolysis reactions were identified as the dominant processes during the hydrothermal conversion. The incorporation of PFS significantly enhanced the iron content in the hydrochar by 519.6% to 748.3%, and the rise in hydrothermal temperature facilitated the transformation of iron from Fe(III) to Fe(II), thereby improving its reducibility. PAM exhibited degradation at lower temperatures, generating oxygen-containing functional groups, while PFS promoted the degradation and carbonization of organic matter. The hydrochar prepared at 180℃ showed higher nutrient retention. Rice cultivation experiments indicated that the application of algal mud-based hydrochar did not adversely affect rice growth; notably, PAM-based hydrochars increased rice plant biomass by 9.0%. Based on field survey data, it was estimated that converting Taihu algal mud into hydrochar could annually recover 3077.7 tons of total nitrogen and 776.7 tons of total phosphorus. The recovered total phosphorus accounted for 43.1% of the external phosphorus load input into Taihu Lake.

导出引用

王怡梦, 梁韵仪, 陈丙法, 马亚鑫, 周紫瑜, 何世颖, 谢慧芳, 薛利红, 冯彦房. 聚合硫酸铁和聚丙烯酰胺对藻泥水热炭特征的影响及产物应用潜力[J]. 中国环境科学. 2025, 45(5): 2587-2597

WANG Yi-meng, LIANG Yun-yi, CHEN Bing-fa, MA Ya-xin, ZHOU Zi-yu, HE Shi-ying, XIE Hui-fang, XUE Li-hong, FENG Yan-fang. Effects of polyferric sulfate and polyacrylamide on algal mud-based hydrochar and their application potential[J]. China Environmental Science. 2025, 45(5): 2587-2597

中图分类号： X705

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