Comparison of three different wastewater sludge and their respective drying processes: Solar, thermal and reed beds – Impact on organic matter characteristics

Collard, Marie; Teychene, Benoît; Lemée, Laurent

doi:10.1016/j.jenvman.2016.05.070

Cited by 47 publications

(21 citation statements)

References 35 publications

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“…(120 hours). In the samples of Collard et al [20], on the other hand, heat-drying at 120°C decreased the percentage of humin; 59% in Original, 59% in HD-85, and 30% in HD-120.…”

Section: Fractionation Of Organic Matter By Chemical Extractionmentioning

confidence: 83%

“…Different from our samples treated beyond the drying period, the water content of the heatdried sewage sludge produced at wastewater treatment plants varies from less than 10% [3,6,20] to more than 60% [21]. If sewage sludge was heat-dried homogeneously and the content of water in the end-product was relatively high, we can assume that the sludge temperature during the heat-drying treatment did not exceed 100°C.…”

Section: Summary Of the Heating Effects On Mineralized N In Organic Wmentioning

confidence: 87%

“…Figure 14 shows the procedures for separating humic substances into fulvic acid, humic acid, and humin fractions. [20] were added to the figure, which were obtained from heat-drying of sewage sludge at 85 and 120°C. However, only a rough comparison between two datasets is possible, because Collard et al used a slightly different extraction method (the IHSS method) and also removed lipids with a mixture of dichloromethane and methanol before extracting humic substances.…”

Section: Fractionation Of Organic Matter By Chemical Extractionmentioning

confidence: 99%

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An Overview of the Effects of Heat Treatments on the Quality of Organic Wastes as a Nitrogen Fertilizer

Moritsuka¹,

Matsuoka²

2018

Nitrogen in Agriculture - Updates

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Sewage sludge is often heat-dried to eliminate water and pathogens. However, heat-drying can also change the form of nitrogen (N). To improve our understanding of this phenomenon, we examined the heat-induced changes in the rate of N mineralization from soils and organic wastes. Published results revealed that the response to the heating temperature differed between soils and organic wastes. As the heating temperature increased to 200°C, the rate of N mineralization increased in soils but decreased in organic wastes. In organic wastes such as sewage sludge, the content of mineralized N tended to decrease sharply when heating temperatures increased to 150-200°C. Furthermore, our results obtained from heat-drying of sewage sludge at 180°C indicated that the rate of carbon (C) mineralization decreased with increasing heating period after the sludge temperature reached 180°C. The C in sewage sludge heated at 180°C for 120 hours after complete drying contained more humin and aromatic C than that in sludge that was heat-dried at 180°C without the additional heating period. These results suggest that the heat-drying treatment can be divided into the drying and denaturing periods and that the temperature of the sludge, not that of the reactor, affects the quality of the end-product.

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“…(120 hours). In the samples of Collard et al [20], on the other hand, heat-drying at 120°C decreased the percentage of humin; 59% in Original, 59% in HD-85, and 30% in HD-120.…”

Section: Fractionation Of Organic Matter By Chemical Extractionmentioning

confidence: 83%

Section: Summary Of the Heating Effects On Mineralized N In Organic Wmentioning

confidence: 87%

Section: Fractionation Of Organic Matter By Chemical Extractionmentioning

confidence: 99%

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An Overview of the Effects of Heat Treatments on the Quality of Organic Wastes as a Nitrogen Fertilizer

Moritsuka¹,

Matsuoka²

2018

Nitrogen in Agriculture - Updates

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“…Concerning the macronutrients, the UM samples contain significant higher levels of nitrogen when compared to AD samples (p < 0.05). However, the phosphorus content in both sample types is quite variable, but with agronomic interest [6,26]. Nevertheless, it is necessary to evaluate its bioavailability when applied to the soil.…”

Section: Discussionmentioning

confidence: 99%

Effect of Thermal Drying and Chemical Treatments with Wastes on Microbiological Contamination Indicators in Sewage Sludge

Santos

Matos

et al. 2020

Microorganisms

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This work aims to evaluate the microbiological contamination of sewage sludge (SS) collected in urban wastewater treatment plants (WWTP) from Portugal. Two types of SS were considered: urban mixed (UM) and from anaerobic digestion (AD). The two types of samples were characterized in relation to the main physical and chemical parameters, as well as the microbiological contamination (Escherichia coli and Salmonella spp). Then, sanitation tests were conducted through thermal drying and chemical treatments. Towards a circular economy, industrial alkaline wastes (green liquor dregs -GLD, lime mud, coal fly ash, eggshell) were tested as alternatives to lime. Only six out of nineteen samples complied with the legal limits for both microorganisms. However, drying at 130 • C sanitized selected samples below the E. coli limit, regardless of the initial moisture or contamination. Additionally, CaO (obtained from eggshell) led to the complete elimination of E. coli at any dosage studied (0.05-0.15 g/g SS wet basis ). GLD evidenced the ability to reduce E. coli contamination at room temperature, but not enough to comply with the legal limit. In general, this work highlights the need to sanitize the SS before its application to the soil, and the positive role of some wastes on this goal.

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“…In a waste water treatment plant, where sludge treatment is an essential processing step in waste water management systems, recent studies stated that the disposal and treatment of the sludge takes up a share of more than 50% of the construction and operation costs [14][15][16]. Sludge treatment with solar dryers is a comparatively simple technology, and has achieved quite good results with regard to the specific energy consumption [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Drying Characteristics of Biogas Digestate in a Hybrid Waste-Heat/Solar Dryer

Maurer

Müller

2019

Energies

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The use of biogas plants has increased sharply in recent years. A typical biogas plant of 500 kWel produces approx. 10,000 t of digestate per year, with a moisture content of more than 90%. For the purpose of reducing the transport mass and increasing the nutrient concentration, the digestate has to be dried. Using renewable energy is a way to treat biogas digestate without any additional fossil energy requirement for drying. In this study a solar greenhouse dryer was modified to use additional waste-heat from the combined heat and power unit (variant S-CHP), as well as the exhaust gas from a micro turbine (variant S-CHP-MT). The hybrid waste-heat/solar dryer achieved a moisture content for the digestate of 10.9%, and 10.5%, after 13 d of drying for variant S-CHP-MT and S-CHP-MT, respectively. Due to the higher energy input by additional use of the micro turbine, the specific energy consumption is higher for the variant S-CHP-MT. In general, the results showed that the combination of solar energy and waste-heat from electricity generation of a biogas plant is a suitable way to reduce the moisture content of the digestate to a safe level for further handling and storage.

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Comparison of three different wastewater sludge and their respective drying processes: Solar, thermal and reed beds – Impact on organic matter characteristics

Cited by 47 publications

References 35 publications

An Overview of the Effects of Heat Treatments on the Quality of Organic Wastes as a Nitrogen Fertilizer

An Overview of the Effects of Heat Treatments on the Quality of Organic Wastes as a Nitrogen Fertilizer

Effect of Thermal Drying and Chemical Treatments with Wastes on Microbiological Contamination Indicators in Sewage Sludge

Drying Characteristics of Biogas Digestate in a Hybrid Waste-Heat/Solar Dryer

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