Full scale co-digestion of wastewater sludge and food waste: Bottlenecks and possibilities

Nghiem, Long D.; Koch, Konrad; Bolzonella, David; Drewes, Jörg E.

doi:10.1016/j.rser.2017.01.062

Cited by 277 publications

(139 citation statements)

References 50 publications

(75 reference statements)

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“…This is also confirmed by Nghiem et al (2017): in his recent work, the author mentions that, despite the rapid increase in the number of co-digestion studies at laboratory scale in the literature over the last couple of years, the number of pilot-and full-scale studies is still very limited. Table 6 shows a list of best practices in WWTPs; the same examples are described in detail in the paragraph below.…”

Section: Braun Et Al 2002mentioning

confidence: 72%

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Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Gandiglio

Lanzini

Soto

et al. 2017

Front. Environ. Sci.

104

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The present work provides an overview of technological measures to increase the self-sufficiency of wastewater treatment plants (WWTPs), in particular for the largely diffused activated sludge-based WWTP. The operation of WWTPs entails a huge amount of electricity. Thermal energy is also required for pre-heating the sludge and sometimes exsiccation of the digested sludge. On the other hand, the entering organic matter contained in the wastewater is a source of energy. Organic matter is recovered as sludge, which is digested in large stirred tanks (anaerobic digester) to produce biogas. The onsite availability of biogas represents a great opportunity to cover a significant share of WWTP electricity and thermal demands. Especially, biogas can be efficiently converted into electrical energy (and heat) via high temperature fuel cell generators. The final part of this work will report a case study based on the use of sewage biogas into a solid oxide fuel cell. However, the efficient biogas conversion in combined heat and power (CHP) devices is not sufficient. Self-sufficiency requires a combination of efficient biogas conversion, the maximization the yield of biogas from the organic substrate, and the minimization of the thermal duty connected to the preheating of the sludge feeding the anaerobic digester (generally achieved with pre-thickeners). Finally, the co-digestion of the organic fraction of municipal solid waste (OFMSW) into digesters treating sludge from WWTPs represent an additional opportunity for increasing the biogas production of existing WWTPs, thus helping the transition toward self-sufficient plants.

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Section: Braun Et Al 2002mentioning

confidence: 72%

“…Furthermore, a 10% reduction in the entering OFMSW has been accounted because of material losses in the pre-treatment stage which should be installed onsite (Nghiem et al, 2017). Mass balances at the inlet of the digester before and after the addition of co-digestion are presented in Table 9.…”

Section: Sludge Co-digestion With Ofmswmentioning

confidence: 99%

Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Gandiglio

Lanzini

Soto

et al. 2017

Front. Environ. Sci.

104

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“…Neste sentido, existem oportunidades para utilizar a capacidade destes reatores e codigerir resíduos alimentícios e lodos promovendo a recuperação de energia e uma série de outros benefícios econômicos e ambientais (NGHIEM et al, 2017).…”

Section: Introductionunclassified

Redução Das Cargas Orgânicas De Biomassas Residuais De Uma Indústria Alimentícia Por Meio De Tratamento Anaeróbio

Hasan

Leite

Pallaoro

et al. 2018

R. gest. sust. ambient.

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RESUMOA adoção de técnicas de tratamento de efluentes é essencial para que o setor agroindustrial, amplamente desenvolvido no Brasil, seja sustentado e ampliado considerando os impactos de suas atividades e as limitações ambientais existentes. O presente estudo caracterizou biomassas residuais de uma indústria alimentícia, objetivando monitorar parâmetros de Demanda Bioquímica de Oxigênio (DBO5), Demanda Química de Oxigênio (DQO) e a relação entre estes, para identificar a biodegradabilidade de amostras submetidas ao processo de digestão anaeróbia. O intuito foi avaliar a eficiência na remoção das cargas orgânicas, expressas sob a forma de DQO e DBO5, por meio de sua conversão em biogás. Os resultados apresentaram valores na relação DQO/DBO5 menores que 2,5 indicando biodegradabilidade das amostras e, portanto, o tratamento biológico foi considerado adequado. Os percentuais de remoção de DQO e DBO nas amostras variaram de 53,0 a 68,6% e 84,0 a 94,8% respectivamente, demonstrando eficiência no tratamento adotado e resultando em um rendimento médio de 0,22 LBiogás.g -1 DQO e teor médio de metano de 68,5%.

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“…As a result, oil has been added by some researcher to enhance biogas production while problems were also reported. The LCFAs adsorption onto the biomass caused many operational challenges; digester foaming, flotation, biological bulking, odours, oxygen mass-transfer difficulties, increased effluent concentrations of organic matter, which may result in substrate and product transport limitation, clogging of gas collection and handling systems, blockage of pipes and pumps [1,9,13,22,23,[29][30][31][32]. Similarly, a high concentration of lipid can cause process instability through sludge flocculation (biomass wash out), direct inhibition, VFAs overload, and physical fouling of equipment [30,33].…”

Section: Introductionmentioning

confidence: 99%

Effect of Oil Content on Biogas Production, Process Performance and Stability of Food Waste Anaerobic Digestion

Awe

et al. 2017

Waste Biomass Valor

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The primary cause of anaerobic digester failure includes accumulation of inhibitory substances and intermediate products such as volatile fatty acids (VFAs), free ammonia (NH 3 + ), and ammonium (NH 4 + ). They (except VFAs) are however required as essential nutrients for bacteria growth. The current study specifically investigated the effect of oil content on the biogas production and the stability of anaerobic digestion of food waste. Two lab scale reactors were designed with different organic loading rates and feeding adjustment of used oil addition to testing the effects of lipids on biodegradation and biogas production. The results indicate that, at 2.0 g VS L −1 d −1 , the addition of oil (5% v/v), caused the reactor failure, whereas, at 4.0 g VS L −1 d −1 , the reactor remained stable for 10 days before the accumulation of VFAs, which resulted in low pH, and thus reduced the biogas and methane production. The addition of NaOH to reactivate the reactors can only improve pH, alkalinity and negatively increased viscosity, but there was no significant effect on biogas production and VFAs concentration. An effective solution to reactivate the reactors was achieved by recirculating 50% of both reactor's effluent back to the reactors. This resulted in biogas recovery and stable process performance of the reactors. Surprisingly, NH 4 + -N remained stable (1400 mg L −1 ) throughout the period, far less than the critical concentration of 3000 mg L −1 . On the contrary, the low NH 4 + -N couldn't contribute to buffering the reactor's high VFA concentration during the unstable period, thereby raising new questions on its roles in anaerobic digestion process.

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Full scale co-digestion of wastewater sludge and food waste: Bottlenecks and possibilities

Abstract: Full scale co-digestion of wastewater sludge and food waste: bottlenecks and Full scale co-digestion of wastewater sludge and food waste: bottlenecks and possibilities possibilities

Cited by 277 publications

References 50 publications

Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Enhancing the Energy Efficiency of Wastewater Treatment Plants through Co-digestion and Fuel Cell Systems

Redução Das Cargas Orgânicas De Biomassas Residuais De Uma Indústria Alimentícia Por Meio De Tratamento Anaeróbio

Effect of Oil Content on Biogas Production, Process Performance and Stability of Food Waste Anaerobic Digestion

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