Behavior of Phosphorus during Sewage Sludge Ozonation

IF 2.1 4区环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL

Ozone: Science & Engineering Pub Date : 2022-02-02 DOI:10.1080/01919512.2022.2035212

Yanfang Liu, Wei Gao, Sijie Yin, X. Lou, Gong Li, Haoyun Liu, Zaixing Li

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Abstract

ABSTRACT Since phosphorus (P) is a nonrenewable element essential for life, it is extremely important to understand its potential supply sources. This paper describes the behavior of P during the ozonation of waste activated sludge (WAS) as it is an important pool of P. Also, we investigated whether ozonation of WAS could be an effective method for both P recovery in solution and its bio- and plant-availability in solid residues based on the analysis by the Standards, Measurements, and Testing Program. The results showed that P was enriched in WAS at concentrations above 23 mg/g. Phosphorus transferred from the solid phase to the liquid phase, and the total P content in the liquid phase increased from 1.67 to 40.68 mg/L as the ozone dosage increased from 0 to 0.20 g O3/g MLSS. PO4 3–P was the main form of P in the liquid phase after ozonation, which is beneficial for P recovery. The P fraction analysis revealed that the released P mainly came from apatite P (AP) during ozonation. Additionally, P was more available in solid residues as the proportion of bio-available P (non-apatite inorganic P (NAIP) + organic P (OP)) improved from 73.6% in the raw WAS to 91.7% at an ozone dosage of 0.20 O3/g MLSS. In addition, the solid residues were suitable for plant availability at a moderate Fe/P ratio (0.91) after ozonation. Thus, ozonation is recommended as the preferable solution to achieve an advanced P supply in both the liquid phase and solid residues.

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污水污泥臭氧化过程中磷的行为

摘要磷是一种不可再生的生命必需元素，因此了解其潜在的供应来源至关重要。由于废活性污泥(WAS)是一个重要的磷池，本文描述了它在臭氧化过程中的行为。此外，基于标准、测量和测试程序的分析，我们研究了WAS的臭氧化是否可以成为一种有效的方法，既可以回收溶液中的磷，也可以回收固体残留物中的生物和植物可利用性。结果表明，磷在浓度大于23 mg/g时富集。随着臭氧用量从0 g O3/g MLSS增加到0.20 g O3/g MLSS，磷从固相转移到液相，液相中总磷含量从1.67 mg/L增加到40.68 mg/L。臭氧氧化后液相中磷的主要形态为PO4 - 3-P，有利于磷的回收。磷组分分析表明，臭氧氧化释放的磷主要来自磷灰石磷(AP)。此外，当臭氧用量为0.20 O3/g MLSS时，固体残渣中生物有效磷(非磷灰石无机磷(NAIP) +有机磷(OP))的比例从原was的73.6%提高到91.7%，磷在固体残渣中的可利用性更高。另外，臭氧化处理后的固体残渣在中等铁磷比(0.91)下适合植物利用。因此，臭氧氧化被推荐为在液相和固体残留物中实现高级P供应的首选解决方案。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Ozone: Science & Engineering 环境科学-工程：环境

CiteScore

5.90

自引率

11.10%

发文量

审稿时长

2 months

期刊介绍： The only journal in the world that focuses on the technologies of ozone and related oxidation technologies, Ozone: Science and Engineering brings you quality original research, review papers, research notes, and case histories in each issue. Get the most up-to date results of basic, applied, and engineered research including: -Ozone generation and contacting- Treatment of drinking water- Analysis of ozone in gases and liquids- Treatment of wastewater and hazardous waste- Advanced oxidation processes- Treatment of emerging contaminants- Agri-Food applications- Process control of ozone systems- New applications for ozone (e.g. laundry applications, semiconductor applications)- Chemical synthesis. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees.