Influence Of Temperature And Time Of Sewage Sludge Incineration On The Mobility Of Heavy Metals

Latosińska, Jolanta

doi:10.37190/epe170409

Cited by 12 publications

(8 citation statements)

References 21 publications

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“…The increase of the temperature of the thermal treatment of sludge, as described by most of the obtained models, has a favourable influence on the decrease of the value of leaching of heavy metals (tab.10-tab.12). The statement above converges with the test results presented in [Latosińska, 2017;Latosińska, 2019, Latosińska et al 2012]. In the mentioned papers, it was proven that the factor decreasing the leaching and the mobility of heavy metals from sewage sludge ash is a higher temperature of sludge Table 10.…”

Section: Resultssupporting

confidence: 83%

The Impact Evaluation of Zeolitization Parameters on the Properties of Sewage Sludge Ash

Latosińska¹

2019

J. Ecol. Eng.

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The incineration of municipal sewage sludge causes the formation of ash, which needs further utilization. The literature gives only few examples of the chemical sewage sludge ash conversion with the hydrothermal method. The effect of conversion depends on the properties of the raw material and the process parameters. According to the domestic and foreign test results of the conversion of fly ash from coal, the fusion method is more effective. The aim of the paper was to evaluate the impact of chemical sewage sludge ash conversion with the fusion method on the chosen properties of the obtained material. The applied conversion parameters were the ratio of sewage sludge ash:NaOH, the concentration of NaOH, the activation time and temperature as well as the crystallization temperature and time. In some of the samples, the introduction of the fusion caused the formation of the following, e.g. (hydroxy)sodalite, zeolite X and zeolite Y, zeolite P, (hydroxy)cancrinite. The temperature of the thermal treatment of sludge, the ratio of ash:NaOH and the crystallization time were the parameters having a statistically significant impact on the effect of zeolitization and the properties of the obtained material, but the changes of their values had little effect on the tested features of the modified ash. On the basis of the leaching of Cd, Cr and Ni from the samples after the conversion it was proven that a higher temperature of the thermal treatment of sewage sludge was favourable for the formation of permanent structures.

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Section: Resultssupporting

confidence: 83%

The Impact Evaluation of Zeolitization Parameters on the Properties of Sewage Sludge Ash

Latosińska¹

2019

J. Ecol. Eng.

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“…This paper focuses on the assessment of SSAB effect on selected soil environment properties with a test plant, i.e., soil moisture and temperature, soil pH, content of toxic elements (As, Cd, Cr, Ni and Pb) in the soil, abundance of heterotrophic bacteria and fungi and occurrence of earthworms (Lumbricidae). The research was based on the following assumptions: (i) soil moisture, temperature and pH, as well as the abundance and availability of P, have a direct bearing on the level of microbial activity in the soil [30] and on the activity of B. megaterium introduced with SSAB, (ii) the form of P fertiliser added to the soil can affect soil acidity, principally through the release or gain of H + ions by the phosphate molecule depending on soil pH [31] and because, under P stress conditions, the plants can change the pH of the substrate through the release of organic acids which dissolve the poorly soluble phosphates [32], (iii) the potential presence of heavy metals and other toxic elements in SSAB may increase their accumulation in soil [33], (iv) the introduction of B. megaterium, as an ingredient of SSAB, to the soil environment could modify soil biology due to an increase in the strain population size followed by the reorganisation of the microbial community structure [34] and the modification of the chemical parameters of the soil environment (acid production) [30], (v) the intensity of microbiological processes [35] and the possible stimulation of crop growth resulting from the application of SSAB could indirectly lead to changes in soil moisture and temperature, (vi) changes in habitat parameters could affect the abundance of earthworms which are soil health bioindicators [36].…”

Section: Introductionmentioning

confidence: 99%

Using an Environment-Friendly Fertiliser from Sewage Sludge Ash with the Addition of Bacillus megaterium

Jastrzębska

Kostrzewska

2019

Minerals

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Sewage sludge ash (SSA) is considered to be a valuable secondary raw material for the production of phosphorous fertilisers. This method of recycling may also be a solution to the problem posed by the growing amount of this waste. An innovative suspension fertiliser (SSAB) was produced from SSA and the phosphorus-solubilising bacteria Bacillus megaterium and was tested in a field experiment in the presence of spring wheat as the test plant in comparison to conventional fertilisers (superphosphate, phosphorite). Two variants of plant protection were also adopted: full chemical plant protection (+PP) and no plant protection (−PP). Besides affecting yield, it was expected that SSAB would not worsen the state of the soil environment. This paper presents SSAB effect on soil moisture and temperature, soil pH, content of toxic elements (As, Cd, Cr, Ni and Pb) in the soil, abundance of heterotrophic bacteria and fungi and the occurrence of earthworms. SSAB did not affect the tested soil characteristics when applied in reasonable doses. Plant protection had an individual effect on soil properties but did not modify the fertiliser action. SSAB may be a potential substitute for P fertilisers produced from non-renewable raw materials in times of shortage. Further long-term research is recommended to confirm these findings.

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“…During incineration, P takes the form of volatile oxides, condensing upon cooling to a temperature of 400-600 • C to form P 4 O 10 , which can clog the filters [80,101]. However, the SS incineration is not a waste-free method because ash still contains HM and cannot be used directly in agriculture as this would pollute soil and impact living organisms [102].…”

Section: Sewage Sludge To Phosphorus By Thermochemical Processesmentioning

confidence: 99%

Phosphorus Recovery from Sewage Sludge Ash Based on Cradle-to-Cradle Approach—Mini-Review

et al. 2021

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The wastewater treatment process generates large amounts of P-rich organic waste (sewage sludge (SS)). The direct application of SS in agriculture, being controversial, is gradually being replaced by incineration, leading to the concentration of both P and heavy metals in the solid residual-sewage sludge ash (SSA). The novel closed-loop, cradle-to-cradle (C2C) approach leads to maintaining P production at current levels and counteracts its depletion in the future. The aim of this review is the presentation of the implementation of the C2C approach for P recovery. The paper focuses on steps that comprise P C2C, starting from the SS properties, being a derivative of wastewater type and treatment processes, to SS pre-treatment and finally leading to certified P-fertilizers production from SSA by application thermochemical or wet chemical extraction technologies. Examples of SSA treatment technologies and the final products are provided. It has been summarized that future research should focus on the production of SSA-based fertilizers aligning with the C2C concept and determining its effect on the various agriculture and horticulture crops.

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Influence Of Temperature And Time Of Sewage Sludge Incineration On The Mobility Of Heavy Metals

Cited by 12 publications

References 21 publications

The Impact Evaluation of Zeolitization Parameters on the Properties of Sewage Sludge Ash

The Impact Evaluation of Zeolitization Parameters on the Properties of Sewage Sludge Ash

Using an Environment-Friendly Fertiliser from Sewage Sludge Ash with the Addition of Bacillus megaterium

Phosphorus Recovery from Sewage Sludge Ash Based on Cradle-to-Cradle Approach—Mini-Review

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