Beneficial use of lime mud from kraft pulp industry for drying and microbiological decontamination of sewage sludge

Santos, Andreia F.; Vaz, Telma; Lopes, Daniela; Cardoso, Olga; Quina, Margarida J.

doi:10.1016/j.jenvman.2021.113255

Cited by 12 publications

(7 citation statements)

References 22 publications

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“…The same authors found that the size of quicklime also has a different effect on the development of microorganisms-the larger the fraction is, the more difficult it is for it to homogenize with the sludge, so it is necessary to use a higher rate. According to Santos et al 2021 [19], the addition of calcined lime mud (CLM) using a ratio of between 0.05 and 0.15 g CLM/gwb led to the complete elimination of microbiological contamination in almost all cases. Conversely, the use of lime mud (LM) did not seem to act effectively as a sanitary agent.…”

Section: Resultsmentioning

confidence: 99%

“…Environmental conditions such as the active reaction of sludge, salt content, heavy metal content, and temperature can lead to changes in the course of microbial activity in the substrate and, consequently, affect the reproductive capacity of microorganisms [7]. The pathogen microorganisms studied have a strong ability to adapt continuously to changes in the survival environment [11] and may be relatively resistant (especially spore-forming species such as Clostridium perfringens) to commonly used sludge stabilization methods [19]. Other scientists have also found a positive effect on the decontamination of sewage sludge by applying lime [1,10,12,15,24].…”

Section: Resultsmentioning

confidence: 99%

“…The influence of temperature and oxygen on the development of pathogenic and nonpathogenic microflora was observed in laboratory conditions (Figures 2 and 3). At negative and higher positive (70 • C) temperatures, mesophilic microorganisms stopped their development and activity, and psychrophiles and thermophiles (which are less than mesophiles) actively developed in samples cultured at 28 • C. Thermal treatment (100 and 130 • C) without adjuvants reduced microbiological contamination in the sewage sludge [19]. By lowering the temperature to −20 • C and prolonging the cultivation time, the number of microbes decreased.…”

Section: Resultsmentioning

confidence: 99%

“…The main role of liming is to sterilize the sludge from pathogenic microorganisms and parasites. The study by Santos et al 2021 [19] confirmed that lime mud (LM) and calcined lime mud (CLM) can be used as drying additives and sanitizing agents for sewage sludge. According to these authors, the addition of calcined lime mud using a ratio of between 0.05 and 0.15 g CLM/gwb led to the complete elimination of microbiological contamination in almost all cases.…”

Section: Introductionmentioning

confidence: 99%

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Microbiological Control in Decontamination of Sludge from Wastewater Treatment Plant

2022

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Dynamics of the microbiological indicators of fresh sludge from wastewater treatment plants with a concentration of CaO, 10% and 20%, and ash, −30% and 50%, and treated with quicklime, ash, and microbial fertilizer for a 50-day period of composting were studied. The influence of temperature, water content, and oxygen on the development of microbes was established in laboratory conditions. Microbiological analysis included the determination of non-pathogenic (non-spore-forming bacteria, bacilli, actinomycetes, micromycetes, bacteria digesting mineral nitrogen), and pathogenic (Salmonella, Listeria, Escherichia coli, Enterococcus, Clostridium perfringens) microorganisms. Of the beneficial microflora in the sludge before treating, the amount of non-spore-forming bacteria was the highest, followed by bacilli and micromycetes. It was found that actinomycetes were absent in the untreated sludge. Clostridium perfringens occupied a major share in the composition of the pathogenic microflora, followed by Escherichia coli, Enterococcus, and Listeria. The best results for decontamination of the sludge were obtained by adding 20% quicklime and 50% ash. Alkalization of the sludge after treatment led to the destruction of pathogenic microflora but also reduced the number of beneficial microorganisms. The decrease in pH during the study period determined the redevelopment of pathogenic microflora. Combined variants with lime or ash and microbial fertilizer showed better results for the development of non-pathogenic microflora and the destruction of pathogens.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microbiological Control in Decontamination of Sludge from Wastewater Treatment Plant

2022

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“…Additionally, the main disposal method for SS in the United States is also land utilization, and is up to approximately 47% [17]. Furthermore, due to the hazardous substances (heavy metals, organic pollutants) in SS, most countries have established national regulations that control the application of SS land disposal, such as the United States' Code 40 of the Federal Regulations, Part 503, and the European Union's Council Directive 86/278 [1,18]. In China, the application of SS onto farmland and forestland is also regulated by GB 4284-2018 and CJ/T 362-2011, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of Sewage Sludge Application on Plant Growth and Soil Characteristics at a Pinus sylvestris var. mongolica Plantation in Horqin Sandy Land

Bai

Sun

et al. 2022

Forests

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The application of domestic sewage sludge (SS) may affect plant growth and soil quality through altering nutrient availability. However, the effect of SS application on the plant–soil system in sandy soils is poorly understood. In this study, we established SS application treatment plots (SL, 25 t ha−1) and control treatment plots without sewage sludge application (CK, 0 t ha−1). SS was applied to the soil surface of a Mongolian pine (Pinus sylvestris var. mongolica) plantation in Horqin Sandy Land, Inner Mongolia, China, to assess its potential effects on plants and soil. We analyzed tree growth performances (tree height, basal diameter, and diameter at breast height), understory traits (species diversity, coverage, and aboveground biomass), soil physical and chemical parameters (nutrient content, dissolved organic carbon, soil water content, bulk density, pH), and proxies of ecosystem services (soil organic carbon and total nitrogen stocks). The results showed that SS addition not only significantly increased soil nutrient contents, but also markedly enhanced aboveground productivity and plant coverage. Specifically, SS addition decreased soil bulk density and increased concentrations of soil organic carbon, total nitrogen, and total phosphorus and mineral nitrogen, and it also increased soil carbon and nitrogen stocks. Furthermore, the addition of SS significantly increased soil dissolved organic carbon contents and enhanced the fluorescence intensities of dissolved organic carbon components (humic acid-like and UV fulvic acid-like) in the topsoil (0–5 cm). This study provides evidence that SS is an acceptable, and possibly preferred organic fertilizer for improving the soil quality and tree–grass growth of Mongolian pine plantations.

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In-Situ Dehydration Test of Shield Spoil in Mudstone and Pebble Soil Composite Stratum

Zhao,

Wen,

et al. 2023

KSCE J Civ Eng

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Beneficial use of lime mud from kraft pulp industry for drying and microbiological decontamination of sewage sludge

Cited by 12 publications

References 22 publications

Microbiological Control in Decontamination of Sludge from Wastewater Treatment Plant

Microbiological Control in Decontamination of Sludge from Wastewater Treatment Plant

Effects of Sewage Sludge Application on Plant Growth and Soil Characteristics at a Pinus sylvestris var. mongolica Plantation in Horqin Sandy Land

In-Situ Dehydration Test of Shield Spoil in Mudstone and Pebble Soil Composite Stratum

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