Acidification and alkali precipitation for phosphorus recovery from municipal digested sludge

IF 1.7 4区环境科学与生态学 Q4 ENVIRONMENTAL SCIENCES

Water and Environment Journal Pub Date : 2023-12-27 DOI:10.1111/wej.12915

İsmail Yigit Seckin, Mahmut Altiner, Birol Kayranli, Turan Yilmaz

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引用次数: 0

Abstract

Municipal digested sludge (MDS) has considerable phosphorus content that is between 1% and 15% in dry matter and it is a potential source for phosphorus recovery. A high amount of MDS is generated from sewage treatment plants in large cities and has many environmental concerns with its organic and inorganic constituents. In this study, phosphorus was recovered by precipitation with Ca(OH)₂ and NaOH. Acid pretreatment was applied to MDS with H₂SO₄ and 58.7% of phosphorus was extracted from the solid phase to the liquid phase at pH 2. Up to 99% of dissolved phosphorus in the liquid phase was recovered with Ca(OH)₂ and NaOH. Almost similar phosphorus precipitation rates were achieved with both bases but higher phosphorus contents (17% as P₂O₅) in precipitates were obtained by NaOH. The product obtained in this study can serve as a high-quality raw material substitute for the low-grade phosphate rocks (<15% P₂O₅) commonly utilized in the phosphate industry. Furthermore, this research presents a practical, environmentally friendly and cost-effective approach for sustainable sludge management and phosphorus production.

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酸化和碱沉淀法回收城市消化污泥中的磷

市政消化污泥（MDS）的磷含量相当高，干物质含量在 1%到 15%之间，是一种潜在的磷回收来源。大城市的污水处理厂会产生大量的 MDS，其有机和无机成分引起了许多环境问题。本研究采用 Ca(OH)2 和 NaOH 沉淀法回收磷。用 H2SO4 对 MDS 进行酸性预处理，在 pH 值为 2 时，58.7% 的磷从固相被提取到液相中。两种碱的磷沉淀率几乎相似，但 NaOH 的沉淀物中磷含量更高（以 P2O5 计为 17%）。本研究获得的产品可作为磷酸盐工业常用的低品位磷矿石（P2O5 含量为 15%）的优质原料替代品。此外，这项研究还为可持续污泥管理和磷生产提供了一种实用、环保且经济高效的方法。

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

Water and Environment Journal 环境科学-湖沼学

CiteScore

4.80

自引率

0.00%

发文量

审稿时长

18-36 weeks

期刊介绍： Water and Environment Journal is an internationally recognised peer reviewed Journal for the dissemination of innovations and solutions focussed on enhancing water management best practice. Water and Environment Journal is available to over 12,000 institutions with a further 7,000 copies physically distributed to the Chartered Institution of Water and Environmental Management (CIWEM) membership, comprised of environment sector professionals based across the value chain (utilities, consultancy, technology suppliers, regulators, government and NGOs). As such, the journal provides a conduit between academics and practitioners. We therefore particularly encourage contributions focussed at the interface between academia and industry, which deliver industrially impactful applied research underpinned by scientific evidence. We are keen to attract papers on a broad range of subjects including: -Water and wastewater treatment for agricultural, municipal and industrial applications -Sludge treatment including processing, storage and management -Water recycling -Urban and stormwater management -Integrated water management strategies -Water infrastructure and distribution -Climate change mitigation including management of impacts on agriculture, urban areas and infrastructure