Desalination of dredged sediments for beneficial use: a case of study for raising agricultural peatlands

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES Journal of Soils and Sediments Pub Date : 2024-09-16 DOI:10.1007/s11368-024-03875-x
Maria Barciela-Rial, Wouter van der Star
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Abstract

Purpose

Sediments from marine areas contain salt, limiting beneficial use possibilities. This study investigates the impact of rinsing with fresh water on ion concentration and organic matter (OM) content in marine sediments, and how salinity hinders water release under induction.

Methods

In a lab simulation, marine sediment was mixed with fresh water (1:6 volume ratio) for 5 min at 285 rpm using a HOBART planet N-50 Mixer. An adapted Thermogravimetric Analysis (TGA) procedure determined the OM content and the temperature at which all water was released.

Results

Mixing sediment with fresh water reduced ion concentrations. Monovalent ions like sodium and chloride were released immediately, while higher valence ions like sulfate and phosphate were released gradually. Rinsing with fresh water also reduced OM content. A second mix with the salty supernatant water did not further reduce salinity or OM.

Conclusion

Determining OM content in salty sediments requires continuous mass loss monitoring to identify the temperature at which all water is removed. For agricultural reuse, maintaining nutrient levels and OM while reducing salt content to prevent groundwater salinization is crucial. Supernatant water should be removed promptly after rinsing to halt nutrient removal. The results of this study contribute to beneficial reuse of dredged sediment.

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对疏浚沉积物进行脱盐处理以实现有益利用:提高农用泥炭地的研究案例
目的来自海洋地区的沉积物含有盐分,限制了有益利用的可能性。本研究调查了用淡水冲洗对海洋沉积物中离子浓度和有机物(OM)含量的影响,以及盐度如何阻碍诱导下的水释放。方法在实验室模拟中,使用 HOBART 行星 N-50 混合器将海洋沉积物与淡水(体积比为 1:6)在 285 rpm 的转速下混合 5 分钟。结果将沉积物与淡水混合可降低离子浓度。钠和氯等单价离子立即释放,而硫酸根和磷酸根等高价离子则逐渐释放。用淡水冲洗也降低了 OM 含量。结论要确定含盐沉积物中的 OM 含量,需要对质量损失进行持续监测,以确定去除所有水分的温度。对于农业回用而言,在降低含盐量以防止地下水盐碱化的同时保持营养水平和 OM 至关重要。冲洗后应及时去除上清水,以阻止营养物质的去除。本研究的结果有助于疏浚沉积物的有益再利用。
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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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