Comparative assessment of municipal sewage sludge incineration, gasification and pyrolysis for a sustainable sludge-to-energy management in Greece

Σαμολαδά, Μαρία; Zabaniotou, Α.

doi:10.1016/j.wasman.2013.11.003

Cited by 458 publications

(202 citation statements)

References 36 publications

Supporting

Mentioning

191

Contrasting

Unclassified

Order By: Relevance

“…363 A wider range of temperatures is used in pyrolysis. In 364 conventional pyrolysis processes operating up to 500°C 365 volatilisation is limited (Samolada & Zabaniotou, 2014 As concentrations were essentially the same in the sludge and 385 the PSSC (Table 1) Table 2 463 shows that PSSC contains less Al and more Fe than ISSA 464 samples, which explains the Al-P and Fe-P binding displayed in 465 and dissimilarities between samples. For both materials, a 602 contact time of 30 minutes is optimum to release PO 4 -P into 603 liquid, because P-rich whitlockite is readily dissolvable in acid.…”

Section: Summary 297mentioning

confidence: 98%

Comparison of phosphorus recovery from incinerated sewage sludge ash (ISSA) and pyrolysed sewage sludge char (PSSC)

et al. 2017

View full text Add to dashboard Cite

Section: Summary 297mentioning

confidence: 98%

Comparison of phosphorus recovery from incinerated sewage sludge ash (ISSA) and pyrolysed sewage sludge char (PSSC)

et al. 2017

View full text Add to dashboard Cite

“…The municipal wastewater generally consists of a mixture of domestic, commercial, industrial wastewater and rainwater [1][2][3]. Due to the great variety of inputs and wastes in the sewer systems, wastewater contains certain undesirable components (organic, inorganic and toxic substances), and pathogenic or disease-causing micro-organisms.…”

Section: Introductionmentioning

confidence: 99%

“…Population growth, urbanization, improvement of living conditions, and the increment of the number of inhabitants connected to WWTPs are responsible for the increase of the amount of sewage sludge produced daily (70-90 g of dry sludge/inhabitant equivalent) [10][11][12][13] and the proper disposal of sludge is a serious environmental issue worldwide [3,14]. Generally, the selection of the best disposal route for the sludge from a particular treatment plant requires the identification of the most secure and environmentally acceptable final destination taking into account the local, regional and/or national conditions (technical, economical, political, geographical) [11,15,16].…”

Section: Introductionmentioning

confidence: 99%

“…Traditional disposal alternatives which have been widely tried include landfilling, soil application, incineration and sea dumping [10][11][12][13][14][17][18][19][20] and currently in Europe the most desirable use of treated sludge is in agriculture as a soil fertilizer [21]. Contrary to the European trends, in Greece sludge utilization in agriculture is very limited [3], the vast majority (> 90%) being landfilled, while the respective mean value in EU countries is only 27% [15,[21][22][23]. Recent studies show an increasing trend for agricultural recycling of sludge in most EU countries, including Greece [19], and this could be a reasonable alternative, especially for plants that serve small and medium scale municipalities, for which heavy metal concentrations are anticipated to be low in the generated sludge [22].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Temporal variability of sewage sludge heavy metal content from Greek wastewater treatment plants

Spanos

Ene

Patronidou

et al. 2016

Ecological Chemistry and Engineering S

View full text Add to dashboard Cite

Abstract:The aim of this study was to evaluate the temporal variations of selected heavy metals level in anaerobic fermented and dewatered sewage sludge. Sewage sludge samples were collected in different seasons and years from three municipal wastewater treatment plants (WWTPs) located in Northern Greece, in Kavala (Kavala and Palio localities) and Drama (Drama locality) Prefectures. An investigation of the potential of sludge utilization in agriculture was performed, based on the comparison of average total heavy metal concentrations and of chromium species (hexavalent, trivalent) concentrations with the allowed values according to the Council Directive 86/278/EEC and Greek national legislation (Joint Cabinet Decision 80568/4225/91) guidelines. In this regard, all the investigated heavy metals (Cd, Cr, Cu, Ni, Pb, Zn, Hg) and chromium species Cr(VI) and Cr(III) have average concentrations (dry matter weight) well below the legislated thresholds for soil application, as following: 2.12 mg kg -1 Cd; 103.7 mg kg -1 Cr; 136.4 mg kg -1 Cu; < 0.2 mg kg -1 Hg; 29.1 mg kg -1 Ni; 62.0 mg kg -1 Pb; 1253.2 mg kg -1 Zn; 1.56 mg kg -1 Cr(VI) and 115.7 mg kg -1 Cr(III). Values of relative standard deviation (RSD) indicate a low or moderate temporal variability for domestic-related metals Zn (10.3-14.7%), Pb (27.9-44.5%) and Cu (33.5-34.2%), and high variability for the metals of mixed origin or predominantly resulted from commercial activities, such as Ni (42.4-50.7%), Cd (44.3-85.5%) and Cr (58.2-102.0%). For some elements the seasonal occurrence pattern is the same for Kavala and Palio sludge, as following: a) Cd and Cr: spring>summer>winter; b) Cu, Ni and Pb: winter>spring>summer. On average, in summer months (dry season) metal concentrations are lower than in spring and winter (wet seasons), with the exception of Zn. For Kavala and Palio the results demonstrate that the increased number of inhabitants (almost doubled) in summer time due to tourism does not influence the metal levels in sludge. Comparing the results obtained for similar spring-summerwinter sequences in 2007 and 2010/11 and for the spring season in 2007, 2008 and 2010, it can be noticed that, in general, the average heavy metal contents show an increasing tendency towards the last year. In all the measurement periods, the Palio sludge had the highest metal contents and Kavala sludge the lowest, leading to the conclusion that the WWTP operating process rather than population has a significant effect upon the heavy metal content of sludge. Cr(VI)/Cr(total) concentration ratios are higher for Kavala sludge in the majority of sampling campaigns, followed by Drama and Palio sludge. The metals which present moderate to strong positive correlation have common origin, which could be a domestic-commercial mixed source.

show abstract

“…Pyrolysis of a deposit of sewage favors to energy saving, restoration of materials and production of high-grade materials, providing the decision "without a wastage". Pyrolysis of ooze is an innovative process, which can transform both the crude and digested ooze to useful bioenergy in the form of naphtha and gas, forming biochar as by-product, which is ecologically steady and has the capacity for binding of carbon and conditioning of the soil, and also for the absorptive production [4].Successful seeding and planting efforts on degraded sites, after fertilization and soil cultivation are reasons to believe that natural seeding can supplement or even replace artificial stand establishment [1; 5]. Organic residues contain plant nutrient elements and after adequate treatment are suitable for using as fertilizers [6].…”

mentioning

confidence: 99%

Technological process of sewage sludge de-watering by impulse method and assesment of options to use dried material

Lazdiņa¹,

Lazdiņš²,

Bebre³

et al. 2017

Engineering for Rural Development

View full text Add to dashboard Cite

Abstract. Waste water sewage sludge is one of municipal waste materials that could be used for nutrient recycling in agriculture, plantation forestry or re-cultivated areas. Sewage sludge contains at least 80 % of water and nutrient rich organic materials what could be used for fertilization of bare soils or for energy production instead of landing on landfills. The de-watering process of sludge by using the impulse method has less energy consumption and higher content of dry matter in the final product is reached in comparison with traditional drying. The aim of the study is to elaborate a method for sewage sludge drying, which allows saving the biological value of final organic material. Impulse interval, frequency, air pressure and temperature in the camera are the key factors for an economically effective process and reaching of qualitative final product. The product could be used for fertilization of non-food products, tree planting, perennial grasses for seed production etc. If sludge contains too high concentration of heavy metals, it could be burned for energy production, and just ashes deponent on landfills. The technological and energy consumption aspects of the methods were analyzed. For sewage sludge containing a low content of heavy metals. Drying is more sustainable after -and pretreatment methods before recycling of plant nutrient elements included in sludge organic material for farming. Transport of dried material is more economical as fresh mass, as well dry material does not smell. The barriers for implementation of these technologies into common practice are more political than technical.Keywords: waste water sewage sludge, pneumatic pulse method. IntroductionSewage sludge is one of municipal waste materials that could be used for nutrient recycling in agriculture, plantation forestry or re-cultivated areas. Sewage sludge contains at least 80 % of water and nutrient rich organic materials what could be used for fertilization of bare soils or for energy production instead of landing on landfills [1].Three methods are mainly applied: convective drying, conductive drying and solar drying, each one presenting different characteristics [1]. Thermal drying with the use of a pneumatic pulse method significantly speeds up the drying process of bulk materials [1; 2] and sludge is one of such materials. By using the impulse method less input of energy to the de-watering process of sludge and higher content of dry matter in the final product could be reached. Thermal drying of sewage sludge is not cost effective if heat is supplied from primary energy sources, but can be effective if waste heat obtained during the drying process is used. Appropriate integration can be realized between wastewater treatment plants and power plants operating on production waste, by recycling waste as an energy carrier for drying sewage sludge [3]. The developed quadratic models show that the optimisation of the dosage of air conditioners allows to increase dehydration by 70 %, thereby reducing 50 % and 54 % emission of odou...

show abstract

Comparative assessment of municipal sewage sludge incineration, gasification and pyrolysis for a sustainable sludge-to-energy management in Greece

Cited by 458 publications

References 36 publications

Comparison of phosphorus recovery from incinerated sewage sludge ash (ISSA) and pyrolysed sewage sludge char (PSSC)

Comparison of phosphorus recovery from incinerated sewage sludge ash (ISSA) and pyrolysed sewage sludge char (PSSC)

Temporal variability of sewage sludge heavy metal content from Greek wastewater treatment plants

Technological process of sewage sludge de-watering by impulse method and assesment of options to use dried material

Contact Info

Product

Resources

About