Evaluation of the effectiveness of the use of humic substances as washing agents of oil-contaminated soils

This paper is based on recent articles regarding applications of humic substances (HSs). HSs are natural organic materials, which have a number of potential applications. Furthermore, HSs are cheap, widespread and obtainable from bio-waste materials. HSs can be used as organic compound sorbents or in detoxification. They are applied as organic additives due to their positive effect on soil and plants, even under stress conditions. HSs reduce water consumption and minimise environmental problems. HSs are utilised for the remediation of multi-metal contaminated soils and as substitutes for synthetic washing agents. From an environmental engineering point of view, it is beneficial to remove HSs from municipal management, where they are undesirable (by-products of disinfection) and to utilise them where they are valuable. The aim of this article is to provide a greater insight into research about the applications of HSs.

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Detoxifying Capacity of Oxidized Humic Substances in Oil-Contaminated Soils

Chemistry and Technology of Fuels and Oils ◽

10.1007/s10553-021-01271-6 ◽

2021 ◽

Author(s):

N. A. Likhacheva ◽

E. A. Zakharova

Keyword(s):

Humic Substances ◽

Contaminated Soils

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Liquid Fertilizers with Organic Substances - Agrochemical Effects Obtained by Application

Revista de Chimie ◽

10.37358/rc.18.6.6350 ◽

2018 ◽

Vol 69 (6) ◽

pp. 1478-1484

Author(s):

Carmen Sirbu ◽

Traian Cioroianu ◽

Nicoleta Marin ◽

Bogdan Rujoi

Keyword(s):

Humic Substances ◽

Contaminated Soils ◽

Rapid Development ◽

Agricultural Practices ◽

Climatic Conditions ◽

Gravimetric Analysis ◽

Organic Substances ◽

Efficiency Increase ◽

Calcium Magnesium ◽

Physical And Chemical

The fertilization methods and technologies rapid development using extra-radicular fertilizers and liquid fertilizers with or without organic substances is due to both their controlled application possibilities depending on the vegetation phases, crop, agrochemical background, and nutrition deficiencies and efficiency increase of the indices regarding the fertilization costs -economical results The best agricultural practices application, compatible with the new climatic conditions, can actively contribute to environment preservation and protection at the same time with crops constancy and production capability securement. Fertilizers application with solid or liquid humic substances ensures all the needed compounds and minerals for creating and maintaining a fertile soil. At the same time their efficiency depends on multiple factors that include temperature, humidity, previous agricultural practices, soil physical and chemical characteristics, pesticides or other polluting products residues, microbial population present in the soil and the activity it develops. The humic compounds mediate pesticides and toxins degradation and contaminated soils biological reparation rests on humus help in microbial degradation. The paper presents the results obtained by radicular application of two experimental NPK type fertilizers with humic substances at the sunflower crop in vegetation pots. The fertilizers have been physically and chemically characterized and agrochemically tested as compared to an unfertilized control and two fertilized controls with a complex 15.15.15 NPK fertilizer in 120 and 180 kg/ha doses. The experimental fertilizers were applied in portions upon crops sowing and during vegetation in three 200, 300, respectively 400 liters fertilizer/ha and ensured significant gains as compared to the controls.The extracted humic substances and the fertilizers were physically and chemically characterized as well as through differential thermal gravimetric analysis and FT-IR spectrometry. The vegetal material and the sunflower seeds were analyzed regarding the nitrogen phosphorus, potassium, calcium, magnesium, zinc, copper, iron, and manganese contents.

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Evaluation of the effectiveness of humic substances use as washing agents of oil-contaminated soils

Environmental Protection in Oil and Gas Complex ◽

10.33285/2411-7013-2019-6(291)-22-26 ◽

2019 ◽

pp. 22-26

Author(s):

N.Yu. Grechishcheva ◽

◽

D.R. Fekhretdinova ◽

V.P. Murygina ◽

S.N. Gaydamaka ◽

...

Keyword(s):

Humic Substances ◽

Contaminated Soils

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Flushing of Soils Highly Contaminated with Cd Using Various Washing Agents Derived from Sewage Sludge

Energies ◽

10.3390/en15010349 ◽

2022 ◽

Vol 15 (1) ◽

pp. 349

Author(s):

Barbara K. Klik ◽

Dorota Kulikowska ◽

Zygmunt M. Gusiatin

Keyword(s):

Organic Matter ◽

Sewage Sludge ◽

Humic Substances ◽

Contaminated Soils ◽

High Efficiency ◽

Process Efficiency ◽

Clay Loam ◽

Flow Rates ◽

Sandy Clay Loam ◽

Sandy Clay

The suitability of sewage-sludge derived washing agents (SS_WAs) (dissolved organic matter DOM; humic-like substances HLS; soluble humic substances SHS), was assessed for removing Cd from highly contaminated (300 mg/kg) sandy clay loam and clay. The soils were remediated via column flushing at two flow rates, 0.5 and 1.0 mL/min. The stability of the flow velocity (FV) depended on the type of SS_WA and decreased in the following order: DOM > HLS > SHS. Cd was most effectively removed during the first hours of flushing, and the process proceeded with a first-order kinetics. The overall process efficiency was higher at flow rate of 1.0 mL/min than at 0.5 mL/min and ranged from 65.7 (SHS) to 75.5% (DOM) for the sandy clay loam and from 64.7% (SHS) to 67.8% (DOM) for the clay. However, all SS_WAs at both flow rates removed the most mobile Cd fraction (F1) with an efficiency above 90%. Flushing improved soil characteristics in terms of the content of organic matter, humic substances and nutrients. Among all SS_WAs, DOM was the most suitable for remediation of highly Cd-contaminated soils due to high efficiency of Cd removal, the high stability of its FV during flushing and the simple manner of DOM recovery from sewage sludge.

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