Increased biogas production at wastewater treatment plants through co-digestion of sewage sludge with grease trap sludge from a meat processing plant

Luostarinen, Sari; Luste, Sami; Sillanpää, Mika

doi:10.1016/j.biortech.2008.06.029

Cited by 292 publications

(159 citation statements)

References 18 publications

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“…These substances inhibit the methanogens if their concentration exceeds a critical value. By overloading the digester with organic matter, the methanogens are also inhibited due to an accumulation of long chain fatty acids (LCFAs) (Angelidaki et al 1992, Rinzema et al 1993, Hwu et al 1998, Miron et al 2000, Kuang et al 2006, Luostarinen et al 2009). In the biogas producing microbial community methanogenic archaea are more sensitive to disturbances than several species of the bacteria.…”

Section: Introductionmentioning

confidence: 99%

Comparison of different procedures to stabilize biogas formation after process failure in a thermophilic waste digestion system: Influence of aggregate formation on process stability

et al. 2012

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Originally published as:Kleyböcker, A., Liebrich, M., Kasina, M., Kraume, M., Wittmaier, M., Würdemann, H. (2012) ABSTRACTFollowing a process failure in a full-scale biogas reactor, different counter measures were undertaken to stabilize the process of biogas formation, including the reduction of the organic loading rate, the addition of sodium hydroxide (NaOH), and the introduction of calcium oxide (CaO). Corresponding to the results of the process recovery in the full-scale digester, laboratory experiments showed that CaO was more capable of stabilizing the process than NaOH. While both additives were able to raise the pH to a neutral milieu (pH > 7.0), the formation of aggregates was observed particularly when CaO was used as the additive. Scanning electron microscopy investigations revealed calcium phosphate compounds in the core of the aggregates. Phosphate seemed to be released by phosphorus-accumulating organisms, when volatile fatty acids accumulated. The calcium, which was charged by the CaO addition, formed insoluble salts with long chain fatty acids, and caused the precipitation of calcium phosphate compounds. These aggregates were surrounded by a white layer of carbon rich organic matter, probably consisting of volatile fatty acids. Thus, during the process recovery with CaO, the decrease in the amount of accumulated acids in the liquid phase was likely enabled by (1) the formation of insoluble calcium salts with long chain fatty acids, (2) the adsorption of volatile fatty acids by the precipitates, (3) the acid uptake by phosphorus-accumulating organisms and (4) the degradation of volatile fatty acids in the aggregates. Furthermore, this mechanism enabled a stable process performance after re-activation of biogas production. In contrast, during the counter measure with NaOH aggregate formation was only minor resulting in a rapid process failure subsequent the increase of the organic loading rate.2

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Section: Introductionmentioning

confidence: 99%

Comparison of different procedures to stabilize biogas formation after process failure in a thermophilic waste digestion system: Influence of aggregate formation on process stability

et al. 2012

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“…More specifically Luostarinen et al (2009) and Kabouris et al (2009) report an increase of methane yield to the order of 60 % and 260 % for grease trap sludge addition (from a meat processing plant in the former study and from restaurants and other facilities in the latter study) of 46 % and 48 % of the total feed volatile solids load respectively. Furthermore Davidsson et al (2008) report an increase on methane yield of 9-27 % when 10-30 % of grease trap sludge (on a VS basis) was digested along with sewage sludge.…”

Section: Introductionmentioning

confidence: 94%

Increase of biogas production through co-digestion of lipids and sewage sludge

Noutsopoulos

Mamais²,

Antoniou³

et al. 2013

Global NEST Journal

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The aim of this study was to assess the feasibility of co-digesting lipids originated from domestic wastewater along with sewage sludge. Three lab-scale single stage mesophilic anaerobic digesters were operated under a constant hydraulic retention time (15 days). One system (C) was fed on a daily basis with sewage sludge and served as the control system and its operation was compared with two experimental systems (E1 and E2). Both experimental systems received mixtures of sludge and lipids with different lipids content (20 % for system E1 and 60 % for system E2 on a VS basis), whereas organic loadings were 2 KgVS m -3 d -1 and 3,5 KgVS m -3 d -1 for systems E1 and E2, respectively.According to the results it can be stated that the addition of lipids to sewage sludge up to 60 % on a VS basis resulted in a significant increase of biogas production without producing any severe effects on the properties of the digested sludge. More specifically biogas production of reactor E1 was 18 % greater than that of reactor C, whereas biogas produced in reactor E2 was even greater (50 % higher than that of reactor C). Finally it is interesting that during start-up a lag phase was recorded at reactor E2 before biogas production initiated, which should be attributed to the time required for growth of acetogenic bacteria capable to degrade LCFA.

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“…The calculations of energy production possibilities are based on the following assumptions and initial values: -The estimated amount of wastewater sludge is based on the number of inhabitants connected to the wastewater network o The number of inhabitants in Kommunar is 17 300 o The number of inhabitants in Tosno is 36 000 o in both cities 75% of the population is estimated to be connected to the wastewater network o the annual yield of wastewater sludge is 34kg DM /person, which is the average wastewater sludge production according to the statistics in Finland [2] -Before combustion, the sludge is dewatered to 30% DM content. The energy need for mechanical dewatering is 0.03 kWh/kg water [14] -The methane yield in the wastewater is 445 m 3 /t TVS [15], [16] -The methane content of biogas produced is 66% [15], [16] -The lower heating value for methane is 35.6 MJ/m 3 The average values were used for the properties of sludge in Kommunar and Tosno respectively. The results for energy production are presented in table 7.…”

Section: Energy Productionmentioning

confidence: 99%

Suitability of Wastewater Sludge for Utilization in the Leningrad Region (Russia)

2017

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Insufficient wastewater treatment causes serious problems for the environment and health in the Leningrad Region. Even though wastewater treatment has been improving during the last decade, almost no attention has been paid to the wastewater sludge treatment. Nutrient emissions from the organic wastes, including wastewater sludge, are among the most significant sources of the eutrophication of the Baltic Sea. Disposal of sludge causes also significant greenhouse gas emissions, polluting local water resources and filling up the landfill sites. Currently the main treatment method of wastewater sludge in Russia is so called aging. This means that sludge is stored in piles from some months up to some years, and after that the sludge is disposed to landfills. In order to develop wastewater sludge treatment, it is essential to know the properties of the material treated. In Russia, wastewater sludge is often expected to contain high amounts of heavy metals. This is a significant challenge for material or energy recovery from the sludge. Different possible treatment methods of wastewater sludge are discussed in this paper. The properties and composition of wastewater sludge from two different municipal wastewater treatment plants are defined and discussed in the paper. The main properties are volatile and total solids, moisture and ash content, inorganic compounds, heavy metal contents, and the lower heating value of dry matter. The effect of the properties on energy and nutrient recovery purposes are evaluated.

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Increased biogas production at wastewater treatment plants through co-digestion of sewage sludge with grease trap sludge from a meat processing plant

Cited by 292 publications

References 18 publications

Comparison of different procedures to stabilize biogas formation after process failure in a thermophilic waste digestion system: Influence of aggregate formation on process stability

Comparison of different procedures to stabilize biogas formation after process failure in a thermophilic waste digestion system: Influence of aggregate formation on process stability

Increase of biogas production through co-digestion of lipids and sewage sludge

Suitability of Wastewater Sludge for Utilization in the Leningrad Region (Russia)

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