Comparative energy and carbon footprint analysis of biosolids management strategies in water resource recovery facilities

Zhao, Gang; Garrido-Baserba, Manel; Reifsnyder, Samuel; Xu, Jiang; Rosso, Diego

doi:10.1016/j.scitotenv.2019.02.024

Cited by 36 publications

(22 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Sludge thickening and dewatering together showed carbon emissions of 114.3 kg CO 2 -eq/t sludge, and attributed to electricity consumption. The transport of LS to cement plant provided negligible contribution (0.7%) to the overall emissions, and it was in accordance with the results for other sludge management alternatives [32,33].…”

Section: Carbon Footprint Resultssupporting

confidence: 87%

Feasibility and Carbon Footprint Analysis of Lime-Dried Sludge for Cement Production

Zhao

Lin

et al. 2020

Sustainability

Self Cite

View full text Add to dashboard Cite

Cement manufacturing and the treatment of sludge are considered both energy-intensive industries and major greenhouse gas (GHG) emitters. However, there are still few studies on comprehensive carbon footprint analysis for adding municipal sludge in the cement production. In this study, the lime-dried sludge blended with calcium oxide at the mass mixing ratio of 10% was utilized as raw material for the preparation of Portland cement. The chemical and physical properties of sludge were analyzed. A set of carbon footprint calculation methods of lime-drying treatment of sludge and reuse in cement kilns was then established to explore the feasibility of coprocessing lime-dried sludge in cement kilns. The results showed lime-dried sludge containing CaO, SiO2, Al2O3, and Fe2O3 was ideal for cement production as raw material. However, the water content of lime-dried sludge should be strictly limited. The lime-drying process presented the biggest carbon emission (962.1 kg CO2-eq/t sludge), accounting for 89.0% of total emissions. In the clinker-production phase, the lime-dried sludge as raw material substitute and energy source gained carbon credit of 578.8 and 214.2 kg CO2-eq/t sludge, respectively. The sludge used for producing cement clinker could reduce carbon emissions by 38.5% to 51.7%. The addition ratio of lime and stacking time in the sludge lime-drying process could greatly affect the carbon footprint of coprocessing lime-dried sludge in cement kiln.

show abstract

Section: Carbon Footprint Resultssupporting

confidence: 87%

Feasibility and Carbon Footprint Analysis of Lime-Dried Sludge for Cement Production

Zhao

Lin

et al. 2020

Sustainability

Self Cite

View full text Add to dashboard Cite

show abstract

“…The urban WWTPs can be an important part of circular sustainability thanks to integration with the concept of reuse of biosolids (BS), namely treated biological SS (Neczaj and Grosser, 2018). In this context, WWTPs can be reoriented to function as water resource recovery facilities (WRRFs) (Cornejo et al, 2019;Zhao et al, 2019). In fact, traditional WWTPs are focused on the goals of human health and environmental protection; in the WRRFs the goal of resource recovery, through subsequently BS reuse, is added (Cornejo et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Biosolids: What are the different types of reuse?

Collivignarelli

Canato

Abbà

et al. 2019

Journal of Cleaner Production

143

View full text Add to dashboard Cite

“…Therefore, China has been generating a large amount of sludge [2]. As of 2019, the daily wastewater-treatment capacity in China has reached 2.1×10 8 m 3 /d, and the total sludge production in 2019 is estimated roughly at 1.3×10 7 ton DS/year. Sludge, as the by-product of wastewater treatment, has many toxic substances such as pathogens, heavy metals, and some organic contaminants, which can cause serious environmental pollution [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Megacity-Scale Analysis of Sludge Management and Carbon Footprint in China

Zhao¹,

Tang²,

Zhou³

et al. 2022

Pol. J. Environ. Stud.

Self Cite

View full text Add to dashboard Cite

With the growing capacity of wastewater treated, a large amount of sludge has been generated in China. Shanghai has 42 wastewater treatment plants (WWTPs), with a total design capacity of 8.5×10 6 m 3 /day. The sludge production per Capita is higher than in other Chinese regions. The sludge management strategy has changed drastically over the past three years in Shanghai. As to the sludge treatment, deep dewatering technologies such as filter-press dewatering and vacuum filter-press dewatering are the most used methods. On the other hand, the ratio of sludge anaerobic digestion and aerobic composting is very low due to the poor sludge quality. Regarding sludge disposal, sludge landfill has been phasing out, but the ratio of sludge incineration has increased significantly. The carbon footprint results show landfill alternatives generally have more greenhouse gas (GHG) emissions than sludge incineration and land use alternatives. The average CO 2 per ton dry solids (DS) has reduced from 0.91 in 2019 to 0.67 ton CO 2 /t DS in 2020 thanks to the optimization of sludge disposal. This study suggests deep dewatering treatment followed by incineration is considered the reasonable and sustainable sludge management scenario in a megacity.

show abstract

Comparative energy and carbon footprint analysis of biosolids management strategies in water resource recovery facilities

Cited by 36 publications

References 49 publications

Feasibility and Carbon Footprint Analysis of Lime-Dried Sludge for Cement Production

Feasibility and Carbon Footprint Analysis of Lime-Dried Sludge for Cement Production

Biosolids: What are the different types of reuse?

A Megacity-Scale Analysis of Sludge Management and Carbon Footprint in China

Contact Info

Product

Resources

About