Effects of different SRT on anaerobic digestion of MSW dosed with various MSWI ashes

Incineration has become an attractive option for municipal solid waste (MSW) management, due to its several benefits. In fact, it allows volume and mass reduction of waste and energy recovery from MSW combustion. Nevertheless, MSW incineration (MSWI) produces three main types of residues: bottom ash (BA), fly ash (FA) and air pollution control (APC) residues, which require an adequate handling. BA is the most significant by-product from MSWI and is generally considered as nonhazardous waste. Instead, FAs are included as hazardous wastes because are characterised by high content of chlorides, heavy metals and organic compounds. The aim of this paper was to examine the characteristics of MSWI solid residues, the management and reuse of these wastes and their environmental assessment from a life cycle perspective. It was noted that the main components that make up the residues are lead and zinc as well as oxides, mainly CaO, SiO 2 and Al 2 O 3 . Furthermore, it is necessary to take into account the presence of PCDD/F which characterised FA and APC residues, mainly due to chlorine content. Chemical and physical properties of those residues make possible their reuse as construction material, as adsorbent, as well as in geotechnical and agricultural applications. Nevertheless, several studies have demonstrated that a drawback of the reuse of MSWI residues is the existence of heavy metals in elevated concentrations which may affect the environmental quality. In this regard, many studies were aimed to assess the environmental impact related to the introduction of MSWI residues as secondary material in several fields of application.

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“…Besides, some studies have shown that FA heavy metal content could improve biogas production in landfills (Lo et al 2012).…”

Section: Landfill Cover Materialsmentioning

confidence: 99%

Environmental sustainability assessment of the management of municipal solid waste incineration residues: a review of the current situation

Margallo

Taddei

Hernández-Pellón

et al. 2015

Clean Techn Environ Policy

120

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“…A major way of paper waste recycling is in paper mills, but some other uses are being investigated such as construction materials (Folorunso and Anyata, 2007;Sutcu et al, 2014), animal bedding (Ward et al, 2000), composting (Alvarez et al, 2009) or as a fuel (Brummer et al, 2014;Li and Liu, 2000). Many studies have been carried out about the anaerobic digestion of pulp and paper sludge (Lin et al, 2011;Meyer and Edwards, 2014;Priadi et al, 2014;Szeinbaum, 2009) and municipal solid waste (MSW) (partially composed by paper and cardboard) (Kayhanian and Rich, 1995;Lo et al, 2012). In anaerobic digestion, hydrolysis appears to be the rate-limiting step highly particulate waste, like paper waste (Palenzuela Rollón, 1999).…”

Section: Introductionmentioning

confidence: 99%

Mechanical pretreatment of waste paper for biogas production

et al. 2017

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In the anaerobic digestion of lignocellulosic materials such as waste paper, the accessibility of microorganisms to the fermentable sugars is restricted by their complex structure. A mechanical pretreatment with a Hollander beater was assessed in order to reduce the biomass particle size and to increase the feedstock' specific surface area available to the microorganisms, and therefore improve the biogas yield. Pretreatment of paper waste for 60min improves the methane yield by 21%, from a value of 210ml/gVS corresponding to untreated paper waste to 254ml/gVS. 30min pretreatment have no significant effect on the methane yield. A response surface methodology was used to evaluate the effect of the beating time and feedstock/inoculum ratio on the methane yield. An optimum methane yield of 253ml/gVS was achieved at 55min of beating pretreatment and a F/I ratio of 0.3.

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“…Lo et al [49] investigated different solid retention time (SRT) on municipal solid waste (MSW) anaerobic digestion with various MSW incinerator fly ash and bottom ash addition. Results showed that biogas production rates (BPRs, ∼200 to ∼400 cm 3 /g VS) with organic loading rate of ∼0.053 g VS /g VSreactor (Day 1 -435, SRT 20 days, SRT20) at BA 12 g/d and BA 24 g/d dosed bioreactors increased after adaptation.…”

Section: Effect Of the Materials Pretreatment On Biogas Productionmentioning

confidence: 99%

Assessment of Biological Degradability of the Waste Produced by Food Industry

Samešová

Poništ

Hybská

et al. 2021

Ecological Chemistry and Engineering S

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Organic waste from production processes is unutilised potential for the production of energy from renewable sources. The submitted paper studies the conditions of anaerobic degradation of selected waste from food industry (diary and distillery) when biogas is produced. Both types of organic waste have low pH values. Ash form municipal incineration as a material for the treatment of pH of waste was used. Except for the pH increase during anaerobic degradation, ash also serves as a source of macroelements for inoculum microorganisms. Kinetics of anaerobic biological digestion of organic material based on the change of pressure and biogas production depending on the ash addition (change of pH) of input samples was observed. Beside these tests, degradability of the waste was assessed by limiting biologically degradable ratio, BR and specific speed of degradability, q. pH values were adjusted with different amounts of ash (0.5; 1.8; 2.7 g/g of dry matter of organic material). Results of the research confirmed that the addition of optimum amount of ash has a positive effect on anaerobic degradation of organic materials.

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Effects of different SRT on anaerobic digestion of MSW dosed with various MSWI ashes

Cited by 25 publications

References 37 publications

Environmental sustainability assessment of the management of municipal solid waste incineration residues: a review of the current situation

Environmental sustainability assessment of the management of municipal solid waste incineration residues: a review of the current situation

Mechanical pretreatment of waste paper for biogas production

Assessment of Biological Degradability of the Waste Produced by Food Industry

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