Estimating anaerobic biodegradability indicators for waste activated sludge

Mottet, Alexis; François, Emilie; Latrille, Éric; Steyer, Jean-Philippe; Déléris, S.; Vedrenne, Fabien; Carrère, Hélène

doi:10.1016/j.cej.2010.03.059

Cited by 139 publications

(84 citation statements)

References 36 publications

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“…This has been claimed to be problematic as the composition of municipal wastewater, and thus, the wastewater sludge differs from that of pulp and paper mills (Bhathena et al 2006). In a previous study, municipal wastewater sludge from six different wastewater treatment plants were reported to consist of 0.43-0.82 g gVS -1 of proteins, 0.12-0.30 g gVS -1 of carbohydrates and 0.01-0.09 g gVS -1 of lipids (Mottet et al 2010). In the above study, cellulose, hemicellulose and lignin contents were reported to be 0-3 % of TS, 7-27 % of TS and 3-27 % of TS, respectively (Mottet et al 2010).…”

Section: Pre-treatments To Improve Anaerobic Digestion Of Pulp and Pamentioning

confidence: 99%

“…In a previous study, municipal wastewater sludge from six different wastewater treatment plants were reported to consist of 0.43-0.82 g gVS -1 of proteins, 0.12-0.30 g gVS -1 of carbohydrates and 0.01-0.09 g gVS -1 of lipids (Mottet et al 2010). In the above study, cellulose, hemicellulose and lignin contents were reported to be 0-3 % of TS, 7-27 % of TS and 3-27 % of TS, respectively (Mottet et al 2010). In the present study, 57 % of the secondary sludge TS composed of cellulose, hemicellulose and lignin, while the corresponding value for municipal secondary sludge was mainly between 20 and 33 %, with highest value of 53 % (Mottet et al 2010).…”

Section: Pre-treatments To Improve Anaerobic Digestion Of Pulp and Pamentioning

confidence: 99%

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Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Bayr

Kaparaju

Rintala

2013

Chemical Engineering Journal

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Esitetään Jyväskylän yliopiston matemaattis-luonnontieteellisen tiedekunnan suostumuksella julkisesti tarkastettavaksi yliopiston Ylistönrinteellä, salissa YAA303 toukokuun 23. päivänä 2014 kello 12.Academic dissertation to be publicly discussed, In this thesis, the anaerobic digestion of industrial by-products from meat and pulp and paper industry were studied. These materials, which are treated mainly like wastes, were seen to be potential substrates for anaerobic digestion. Methane yields of ca. 700 dm 3 kg volatile solids (VS)added -1 were obtained for slaughterhouse wastes, alone and in co-digestion with rendering wastes. On the other hand, methane yields of 190-240 dm 3 kgVSadded -1 were obtained in the monodigestion of pulp and paper industry primary sludge, and 150-170 dm 3 kgVSadded -1 in the co-digestion of primary sludge with secondary sludge. In the digestion of slaughterhouse and rendering wastes, mesophilic conditions were more stable, and the feasible organic loading rates (OLRs) were 1-1.5 kgVS m -3 d -1 and hydraulic retention times (HRTs) were 50 d. For pulp and paper mill wastewater sludge, thermophilic conditions were more stable with the feasible OLRs of 1-2 kgVS m -3 d -1 and the HRTs of 14-32 d. The digestion processes of these industrial by-products can easily turn unstable. In the digestion of slaughterhouse and rendering wastes, process imbalance may occur due to inhibition from intermediate products like volatile fatty acids, long-chain fatty acids and ammonia. On the contrary, in the digestion of pulp and paper mill wastewater sludge, the low nitrogen content and low pH may cause problems. It was observed that the more stable digestion process of slaughterhouse waste is achieved by additive of Co, Ni, Se, W, Fe and HCl. In addition, in pulp and paper mill secondary sludge digestion, hydrothermal pretreatment, among the studied 12 single or combined pre-treatments, increased the methane yield by 19-31 %. In conclusion, the digestion of two different kinds of industrial by-products was seen to be feasible, although operational conditions should be optimised and possibly enhancement methods used to ensure the stable digestion processes of these vulnerable organic materials.

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Section: Pre-treatments To Improve Anaerobic Digestion Of Pulp and Pamentioning

confidence: 99%

Section: Pre-treatments To Improve Anaerobic Digestion Of Pulp and Pamentioning

confidence: 99%

Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Bayr

Kaparaju

Rintala

2013

Chemical Engineering Journal

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“…The anaerobic biodegradability of each substrate was calculated by dividing the theoretical SMP (related to COD) by the stoichiometric production of 0.350 L CH 4 g -1 COD at STP conditions 30 . 28 , reports the theoretical oxygen demand and the value of B 0,th of typical substrate components.…”

Section: Characterization Of Complex Substratesmentioning

confidence: 99%

Biovalorization of Brewery Waste by Applying Anaerobic Digestion

Vitanza

Cortesi

Gallo

et al. 2016

Chem.Biochem.Eng.Q.

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In the food industry, the brewing sector holds a strategic economic position: in the year 2013, the beer production of the EU-28 was equal to 383,553,000 hL. The brewing process includes chemical and biochemical reactions and solid-liquid separations, involving the generation of various residues and by-products, among which the major two fractions are brewer's spent grain (BSG), and exhausted brewery yeast (BY). Although until today their main use has been for animal feed, in recent years, several studies have investigated the application of anaerobic digestion in order to revalue the brewery wastes.In this work, specific methane production (SMP) and first-order solubilisation (disintegration + hydrolysis) rates (k sol ) for BSG and BY were evaluated. Biomethanation tests were performed in 5-L fed-batch stirred reactors at several substrate/inoculum ratios.

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“…This methane-rich gas is used to supply heat and electricity for the wastewater treatment process and buildings. Although the biodegradability of WAS by anaerobic digestion varies with certain characteristics such as COD:TOC ratio, carbohydrate, protein and lipid concentrations, the biogas yield is generally relatively low with 50-200 L CH4 kg volatile solids(VS) -1 compared to 600-800 L CH4 kg VS -1 for municipal organic waste [2][3][4]. Pre-treatment of this substrate, however, shows great advantages and may allow an immediate and distinct increase in methane yields [3].…”

Section: Introductionmentioning

confidence: 99%

“…Up to now, several studies have been conducted focusing on either single or combined PT using heat and alkaline reagents. Regarding the temperatures, ranges from 25 to 275°C have been investigated, and for the alkaline reagent, several chemicals [KOH, Ca(OH) 2 , NaOH] in different concentrations were tested [5,9].…”

Section: Introductionmentioning

confidence: 99%

A case study for a cost-benefit-based, stepwise optimization of thermo-chemical WAS pre-treatment for anaerobic digestion

Nagler

Aichinger

Kuprian

et al. 2016

J Mater Cycles Waste Manag

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Waste-activated sludge (WAS) may be considered a resource generated by wastewater treatment plants and used for biogas-generation but it requires pre-treatment (PT) for enhanced biogas-yields and reduced WAS disposal costs. To date, a number of studies on the optimization of such PT focused on improved biogas yields but neglected inferred energy and resource consumption. Here, we aimed to identify the most promising thermo-chemical PT-strategy in terms of net energy output and cost-efficiency by optimizing PT temperature and the amount and sort of the alkaline reagent used. We compared methanepotentials and disposal costs of untreated and treated WAS and conducted an annual cost-benefit calculation. We defined 70°C and 0.04 M NaOH as ideal PT-conditions being both, low-energy demanding and efficient. Applying these conditions, enhanced biogas-yields and improved dewaterability led to reduced electricity and disposal costs of 22 and 27%, respectively, resulting in savings of approx. 28% of the yearly WAS-related expenditures of a wastewater treatment plant. Despite multiple benefits in running costs, the implementation of WAS-PT was not recommendable in the presented case study due to high investment costs.

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Estimating anaerobic biodegradability indicators for waste activated sludge

Cited by 139 publications

References 36 publications

Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Screening pretreatment methods to enhance thermophilic anaerobic digestion of pulp and paper mill wastewater treatment secondary sludge

Biovalorization of Brewery Waste by Applying Anaerobic Digestion

A case study for a cost-benefit-based, stepwise optimization of thermo-chemical WAS pre-treatment for anaerobic digestion

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