Assessment of content and chemical forms of arsenic, copper, lead, and chromium in sewage sludge compost as affected by various bulking agents

IF 1.8 3区化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR

Main Group Metal Chemistry Pub Date : 2020-01-01 DOI:10.1515/mgmc-2020-0006

Mahboub Saffari, V. Saffari, Hojatollah Khabazzadeh, H. Naghavi

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引用次数: 8

Abstract

Abstract In current study, the effect of various organic substances as bulking agents (BAs) including wheat straw, pistachio hull wastes, and tree leaves at different levels (10, 25, 45% v/v) were investigated on total concentration and chemical forms of Cu, Pb, Cr, and As in sewage sludge (SS) compost prepared by windrow method. According to the results, the composting process (with/without BAs), due to losses of SS mass and volume, increased the total concentration of heavy metals (HMs) compared to the un-composted SS sample (RSS). Evaluation of HMs chemical forms in prepared compost sample without BAs application (CSS) showed that the composting process reduced the mobility factor of As (from 28% to 20%), Pb (from 11.6% to 9.3%), and Cr (from 14.5% to 9.2%) compared to the RSS. Application of three BAs considerably decreased the mobility factor of As (17.5-18.8%), Pb (4.8-7.9%), and Cr (1.4-6.8%) compared to CSS and RSS. Changes of Cu mobility in prepared compost samples showed an unclear trend, however in some treatments, due to transferred organic fraction into exchangeable and carbonate fractions, increasing of this factor was obvious. Generally, the composting appeared to reduce As, Pb, and Cr availability by stabilizing the three metals and making them more stable and less mobile. In addition, the BAs application effect on HMs behavior of SS compost samples were so different and no specific kind of BAs can be recommended as a superior BAs in SS composting process.

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不同膨松剂对污泥堆肥中砷、铜、铅和铬含量和化学形态影响的评估

摘要在本研究中，研究了不同水平（10%v/v、25%v/v、45%v/v）的麦秆、开心果壳废弃物和树叶等有机物作为填充剂（BA）对风排法污泥堆肥中Cu、Pb、Cr和as的总浓度和化学形态的影响。根据结果，与未堆肥的SS样品（RSS）相比，由于SS质量和体积的损失，堆肥过程（有/没有BA）增加了重金属（HM）的总浓度。对未施用BAs的堆肥样品中HMs化学形态的评估表明，与RSS相比，堆肥过程降低了As（从28%到20%）、Pb（从11.6%到9.3%）和Cr（从14.5%到9.2%）的迁移率。与CSS和RSS相比，三种BA的应用显著降低了As（17.5-18.8%）、Pb（4.8-7.9%）和Cr（1.4-6.8%）的迁移率。制备的堆肥样品中Cu迁移率的变化趋势不明确，但在某些处理中，由于有机组分转移到可交换组分和碳酸盐组分，该因素的增加是明显的。一般来说，堆肥似乎通过稳定这三种金属并使其更稳定、流动性更小来降低As、Pb和Cr的可用性。此外，BA对SS堆肥样品HMs行为的应用效果差异很大，在SS堆肥过程中，没有特定种类的BA可以被推荐为优越的BA。

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

Main Group Metal Chemistry CHEMISTRY, INORGANIC & NUCLEAR-CHEMISTRY, ORGANIC

CiteScore

4.10

自引率

27.80%

发文量

审稿时长

4 weeks

期刊介绍： This journal is committed to the publication of short communications, original research, and review articles within the field of main group metal and semi-metal chemistry, Main Group Metal Chemistry is an open-access, peer-reviewed journal that publishes in ongoing way. Papers addressing the theoretical, spectroscopic, mechanistic and synthetic aspects of inorganic, coordination and organometallic main group metal and semi-metal compounds, including zinc, cadmium and mercury are welcome. The journal also publishes studies relating to environmental aspects of these metals, their toxicology, release pathways and fate. Articles on the applications of main group metal chemistry, including in the fields of polymer chemistry, agriculture, electronics and catalysis, are also accepted.