Influence of Decreasing Supplementation to Transformation of Chemical Forms of Ni, Zn and Cu During Composting of Sewage Sludge

Sidełko, Robert

doi:10.54740/ros.2021.041

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…over 24 hours. It can be concluded from available literature that in practice, the above parameter value falls within 0.6÷1.9 m 3 /kg o.m./day range (Sidełko et al 2011). Different optimum aeration rates have been reported in previous studies.…”

Section: Introductionmentioning

confidence: 74%

Numerical model for simulating the hydraulic parameters of the aeration system ensuring equal oxygenation of the compost heap

Sidełko,

Boruszko

2024

Archives of Environmental Protection

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The aim of the work was to develop a mathematical model using equations of fluid mechanics that describe the dynamics of air flow in a part of the compost aerating system integrated with a stationary reactor. The results of the simulation show that adjusting the flow resistance along the entire length of the compost aerating duct, depending on the distance from the connection of the duct with the fan's pressure conduit pipe through gradually increasing the air outflow area by increasing the number of repeatable gaps, yields a uniform pressure distribution above the grate. The process parameters used for computation were relevant to composting a subscreen fraction separated from mixed municipal waste using 80 mm mesh screen (Fr<80 mm) under real conditions. Microsoft EXCEL 2010 software and STATISTICA version 13.3 by StatSoft were used for numerical and statistical analysis of the test results. The research results are presented in four tables and five figures and discussed in the text of the article. During tests performed in real conditions, various variants were tested for reactor filling level and air outflow active surfaces in subsequent grate parts (Fc (i)). It was found that the target waste layer thickness i.e. 3.0 m and Fc (i) changes, in accordance with the values of the developed model, result in a stable pressure distribution pd, amounting to 1506 Pa and 1495 Pa at the grate front and end part.

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Section: Introductionmentioning

confidence: 74%

Numerical model for simulating the hydraulic parameters of the aeration system ensuring equal oxygenation of the compost heap

Sidełko,

Boruszko

2024

Archives of Environmental Protection

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“…Proces kompostowania jest ważny także ze względu na niskie koszty budowy instalacji procesowych oraz duży potencjał proekologiczny. Proces ten wykorzystywany jest do stabilizacji odpadów oraz do produkcji kompostu [3]. Jego…”

Section: Wprowadzenieunclassified

Mathematical Modeling and Simulation Analysis of a Bioreactor with Forced Aeration

Przysiężnik,

Bartecki

2023

PAR

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The composting process is commonly used in waste management as a method of converting or stabilizing organic waste. Due to the complex, non-linear nature of biological and physicochemical phenomena involved, this process is relatively difficult to predict and control. The control is usually aimed at obtaining the final product, that is, the compost that meets legal standards. The article presents a simple mathematical model of the composting process with forced aeration, which will potentially facilitate the control task. A second order model was developed, with two inputs signals. Based on the mathematical model in the form of the state equations, the computer model of the bioreactor was built in the MATLAB/Simulink environment, which was then used to conduct different simulation tests. It was shown that it is possible to control the process using forced aeration, directly influencing the temperature changes in the bioreactor, and consequently also the time of obtaining the final product of the reaction. The analysis of the dynamic properties of the process performed using its model linearized about some nominal state trajectory shows the changes in its internal stability—starting from the unstable character in the initial phases of the reaction, through stabilization in its intermediate phase, up to the asymptotic stability, ending in the stable equilibrium state.

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Use of Additives in Composting Promotes Passivation and Reduction in Bioavailability of Heavy Metals (HMs) in Compost

Ejileugha,

Onyegbule,

Osuoha

2023

Reviews Env.Contamination (formerly:Residue Reviews)

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Composting influences heavy metal (HM) speciation by transforming the exchangeable and reducible forms of HMs to oxidisable and residual forms, promoting the redistribution of HMs to a more stable form thereby reducing their mobility, leachability, and bioavailability. This enhances HM passivation hence reducing environmental contamination and possible HM-related toxicity. In this review, we explored the impact of additives/ameliorants on HM passivation during composting and the reduction in HM bioavailability in compost. Using additives in composting improved the passivation of HMs and reduced the bioavailability through several mechanisms. Additives may not reduce total HM concentration but reduce the bioavailable concentration, which is of importance in risk assessment. However, vermicomposting is exceptional, as it reduces total HM concentration. Improving humification and microbial activity is at the heart of HM passivation in composting. Overall, conditions and substances that promote humification, thermophilic phase, and improve microbial community structure enhance HM passivation in compost. Combining suitable composting additives depending on HMs of interest and vermicomposting the final compost is most likely to yield the best result in reducing HM bioavailability cum total concentration to achieve a safe final product.

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Influence of Decreasing Supplementation to Transformation of Chemical Forms of Ni, Zn and Cu During Composting of Sewage Sludge

Cited by 3 publications

References 14 publications

Numerical model for simulating the hydraulic parameters of the aeration system ensuring equal oxygenation of the compost heap

Numerical model for simulating the hydraulic parameters of the aeration system ensuring equal oxygenation of the compost heap

Mathematical Modeling and Simulation Analysis of a Bioreactor with Forced Aeration

Use of Additives in Composting Promotes Passivation and Reduction in Bioavailability of Heavy Metals (HMs) in Compost

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