Anaerobic digestion disposal of sewage sludge pyrolysis liquid in cow dung matrix and the enhancing effect of sewage sludge char

Yue, Xia; Arena, Umberto; Chen, Dezhen; Lei, Kaiyuan; Dai, Xiaohu

doi:10.1016/j.jclepro.2019.07.033

Cited by 27 publications

(4 citation statements)

References 42 publications

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“…Additionally, Yue et al (2019) explored the impact of sewage sludge pyrolysis liquid on batch anaerobic digestion of cow manure. They found that adding sewage sludge pyrolysis liquid produced at 550 °C increased biomethane yield by 128.7% compared to the group without addition.…”

Section: Upstream Integration Systemmentioning

confidence: 99%

Materials, fuels, upgrading, economy, and life cycle assessment of the pyrolysis of algal and lignocellulosic biomass: a review

et al. 2023

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Climate change issues are calling for advanced methods to produce materials and fuels in a carbon–neutral and circular way. For instance, biomass pyrolysis has been intensely investigated during the last years. Here we review the pyrolysis of algal and lignocellulosic biomass with focus on pyrolysis products and mechanisms, oil upgrading, combining pyrolysis and anaerobic digestion, economy, and life cycle assessment. Products include oil, gas, and biochar. Upgrading techniques comprise hot vapor filtration, solvent addition, emulsification, esterification and transesterification, hydrotreatment, steam reforming, and the use of supercritical fluids. We examined the economic viability in terms of profitability, internal rate of return, return on investment, carbon removal service, product pricing, and net present value. We also reviewed 20 recent studies of life cycle assessment. We found that the pyrolysis method highly influenced product yield, ranging from 9.07 to 40.59% for oil, from 10.1 to 41.25% for biochar, and from 11.93 to 28.16% for syngas. Feedstock type, pyrolytic temperature, heating rate, and reaction retention time were the main factors controlling the distribution of pyrolysis products. Pyrolysis mechanisms include bond breaking, cracking, polymerization and re-polymerization, and fragmentation. Biochar from residual forestry could sequester 2.74 tons of carbon dioxide equivalent per ton biochar when applied to the soil and has thus the potential to remove 0.2–2.75 gigatons of atmospheric carbon dioxide annually. The generation of biochar and bio-oil from the pyrolysis process is estimated to be economically feasible.

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Section: Upstream Integration Systemmentioning

confidence: 99%

Materials, fuels, upgrading, economy, and life cycle assessment of the pyrolysis of algal and lignocellulosic biomass: a review

et al. 2023

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“…The greatest amount of GHG reduction (19 g CO 2 eq./kg sewage sludge) was observed for the substitution of peat in horticulture. In the case of cascade use in a biogas plant and in agriculture, the substitution of maize silage due to the higher digestion performance (Yue et al, 2019) of 1% could achieve a saving of 15 g CO 2 eq./ kg sewage sludge.…”

Section: Ghg Savings Through Biochar As a Carbon Sequestrator And Nutrient Recyclermentioning

confidence: 99%

Life cycle assessment of sewage sludge pyrolysis: environmental impacts of biochar as carbon sequestrator and nutrient recycler

Gievers¹,

Loewen²,

Nelles

2021

Detritus

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The pyrolysis of sewage sludge is an alternative method to recycle the contained nutrients, such as phosphorus, by material use of the resulting biochar. However, the ecological effects of pyrolysis are not easy to evaluate. Therefore, a life cycle assessment (LCA) was carried out to determine the environmental impact of sewage sludge pyrolysis and to compare it with the common method of sewage sludge incineration. In order to identify the most sustainable applications of the resulting biochar, four different scenarios were analyzed. The modeled life cycles include dewatering, drying and pyrolysis of digested sewage sludge and utilization paths of the by-products as well as various applications of the produced biochar and associated transports. The life cycle impact assessment was carried out using the ReCiPe midpoint method. The best scenario in terms of global warming potential (GWP) was the use of biochar in horticulture with net emissions of 2 g CO2 eq./kg sewage sludge. This scenario of biochar utilization can achieve savings of 78% of CO2 eq. emissions compared to the benchmark process of sewage sludge mono-incineration. In addition, no ecological hotspots in critical categories such as eutrophication or ecotoxicity were identified for the material use of biochar compared to the benchmark. Pyrolysis of digested sewage sludge with appropriate biochar utilization can therefore be an environmentally friendly option for both sequestering carbon and closing the nutrient cycle.

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“…However, the pyrolysis oil contains rich toxic compounds such as phenol, which is harmful to the biological processes. Yue et al (2019) found that the addition of biochar is bene cial to the degradation of pyrolysis oil during its co-anaerobic digestion process. Because the adsorption of pyrolysis oil by biochar decreased the toxicity of pyrolysis oil in anaerobic digester and increased the pyrolysis oil degradation e ciency.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of pyrolysis oil model compound (phenol) with plasma-modified hydro-chars and mechanism exploration

An,

Chen,

Tang

et al. 2023

Environ Sci Pollut Res

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Phenol is one of the important ingredients of pyrolysis oil, contributing to the high biotoxicity of pyrolysis oil. To promote the degradation and conversion of phenol during anaerobic digestion, hydro-chars with high phenol adsorption capacity were produced. The phenol adsorption capabilities of the plain hydrochar, plasma modi ed hydro-char at 25 ℃ (HC-NH 3 -P-25), and plasma modi ed hydro-char at 500 ℃ (HC-NH 3 -P-500), and their adsorption kinetics and thermodynamics were explored. Experimental results indicate that the phenol adsorption capability of HC-NH 3 -P-500 was the highest. The phenol adsorption kinetics of all samples followed the Pseudo-second-order equation and interparticle diffusion model, indicating that the adsorption rate of phenol was controlled by interparticle diffusion and chemistry adsorption simultaneously. By DFT calculations, π-π stacking and hydrogen bond are the main interactions for phenol adsorption. It was observed that an enriched graphite N content decreased the average vertical distance between hydro-chars and phenol in π-π stacking complex, from 3.5120 Å to 3.4532 Å, causing an increase in the negative adsorption energy between phenol and hydro-char from 13.9330 to 23.4181 kJ/mol. For hydrogen bond complex, the average vertical distance decreased from 3.4885 Å to 3.3386 Å due to the increase in graphite N content; causing the corresponding negative adsorption energy increased from 19.0233 to 19.9517 kJ/mol. Additionally, the presence of graphite N in the hydro-char created a positive diffusion region and enhanced the electron density between hydro-char and phenol. Analyses suggest that enriched graphite N contributed to the adsorption complex stability, resulting in an improved phenol adsorption capacity. HighlightsHydro-chars modi ed with plasmas at 500 ℃ exhibits the largest phenol removal rateThe highest N doping in hydro-char achieved at 500 ℃ modi cation Plasma-doped N in hydro-chars is mainly graphite N and pyridine N Increase in graphite N is bene cial for the phenol adsorption Adsorption force for phenol mainly consists of π-π stacking and hydrogen bond

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Anaerobic digestion disposal of sewage sludge pyrolysis liquid in cow dung matrix and the enhancing effect of sewage sludge char

Cited by 27 publications

References 42 publications

Materials, fuels, upgrading, economy, and life cycle assessment of the pyrolysis of algal and lignocellulosic biomass: a review

Materials, fuels, upgrading, economy, and life cycle assessment of the pyrolysis of algal and lignocellulosic biomass: a review

Life cycle assessment of sewage sludge pyrolysis: environmental impacts of biochar as carbon sequestrator and nutrient recycler

Adsorption of pyrolysis oil model compound (phenol) with plasma-modified hydro-chars and mechanism exploration

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