Jing Yang , Li Chen , Liqiong Yang , Xinru Jiang , Liangwei Deng , Xiaoyu Tang , Wenguo Wang
{"title":"有机物的去除减轻了结晶抑制,提高了废水中钾和磷的共回收","authors":"Jing Yang , Li Chen , Liqiong Yang , Xinru Jiang , Liangwei Deng , Xiaoyu Tang , Wenguo Wang","doi":"10.1016/j.envres.2025.121758","DOIUrl":null,"url":null,"abstract":"<div><div>Magnesium potassium phosphate (MPP) hexahydrate crystallization is a promising approach for the simultaneous recovery of potassium and phosphorus. However, organic matter in the wastewater affects the formation of crystals, which reduces the recovery efficiency. This study constructed the optimal conditions for the formation of MPP crystals, on the basis of which the mechanism of the effect of different types of organic matter on crystallization. The results showed that the using MgCl<sub>2</sub> as the magnesium source, potassium and phosphorus recovery efficiencies reached 98.05 % and 99.40 %, respectively, under the following conditions: pH 10, rotation speed of 500 rpm, Mg:K:P molar ratio of 2:1:2, and seed dosage of 5 g/L. Under these conditions, all three organics had an effect on crystallization, with the order of inhibition being sodium alginate > bovine serum albumin > humic acid. Characterization analysis revealed that these organic compounds formed hydrogen bonds with functional groups or complexes with Mg<sup>2+</sup> on the crystal surface, hindering crystal growth and modifying crystal morphology. Finally, when liquid digestate was used as the influent for crystallization reaction, removal of organic pollutants led to significant increase in the potassium recovery efficiency.</div></div>","PeriodicalId":312,"journal":{"name":"Environmental Research","volume":"279 ","pages":"Article 121758"},"PeriodicalIF":7.7000,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Organic matter removal mitigates crystallization inhibition to enhance co-recovery of potassium and phosphorus from wastewater\",\"authors\":\"Jing Yang , Li Chen , Liqiong Yang , Xinru Jiang , Liangwei Deng , Xiaoyu Tang , Wenguo Wang\",\"doi\":\"10.1016/j.envres.2025.121758\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Magnesium potassium phosphate (MPP) hexahydrate crystallization is a promising approach for the simultaneous recovery of potassium and phosphorus. However, organic matter in the wastewater affects the formation of crystals, which reduces the recovery efficiency. This study constructed the optimal conditions for the formation of MPP crystals, on the basis of which the mechanism of the effect of different types of organic matter on crystallization. The results showed that the using MgCl<sub>2</sub> as the magnesium source, potassium and phosphorus recovery efficiencies reached 98.05 % and 99.40 %, respectively, under the following conditions: pH 10, rotation speed of 500 rpm, Mg:K:P molar ratio of 2:1:2, and seed dosage of 5 g/L. Under these conditions, all three organics had an effect on crystallization, with the order of inhibition being sodium alginate > bovine serum albumin > humic acid. Characterization analysis revealed that these organic compounds formed hydrogen bonds with functional groups or complexes with Mg<sup>2+</sup> on the crystal surface, hindering crystal growth and modifying crystal morphology. Finally, when liquid digestate was used as the influent for crystallization reaction, removal of organic pollutants led to significant increase in the potassium recovery efficiency.</div></div>\",\"PeriodicalId\":312,\"journal\":{\"name\":\"Environmental Research\",\"volume\":\"279 \",\"pages\":\"Article 121758\"},\"PeriodicalIF\":7.7000,\"publicationDate\":\"2025-04-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Environmental Research\",\"FirstCategoryId\":\"93\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0013935125010096\",\"RegionNum\":2,\"RegionCategory\":\"环境科学与生态学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENVIRONMENTAL SCIENCES\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Environmental Research","FirstCategoryId":"93","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0013935125010096","RegionNum":2,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENVIRONMENTAL SCIENCES","Score":null,"Total":0}
Organic matter removal mitigates crystallization inhibition to enhance co-recovery of potassium and phosphorus from wastewater
Magnesium potassium phosphate (MPP) hexahydrate crystallization is a promising approach for the simultaneous recovery of potassium and phosphorus. However, organic matter in the wastewater affects the formation of crystals, which reduces the recovery efficiency. This study constructed the optimal conditions for the formation of MPP crystals, on the basis of which the mechanism of the effect of different types of organic matter on crystallization. The results showed that the using MgCl2 as the magnesium source, potassium and phosphorus recovery efficiencies reached 98.05 % and 99.40 %, respectively, under the following conditions: pH 10, rotation speed of 500 rpm, Mg:K:P molar ratio of 2:1:2, and seed dosage of 5 g/L. Under these conditions, all three organics had an effect on crystallization, with the order of inhibition being sodium alginate > bovine serum albumin > humic acid. Characterization analysis revealed that these organic compounds formed hydrogen bonds with functional groups or complexes with Mg2+ on the crystal surface, hindering crystal growth and modifying crystal morphology. Finally, when liquid digestate was used as the influent for crystallization reaction, removal of organic pollutants led to significant increase in the potassium recovery efficiency.
期刊介绍:
The Environmental Research journal presents a broad range of interdisciplinary research, focused on addressing worldwide environmental concerns and featuring innovative findings. Our publication strives to explore relevant anthropogenic issues across various environmental sectors, showcasing practical applications in real-life settings.