Journal
WASTE MANAGEMENT
Volume 135, Issue -, Pages 79-89Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2021.08.035
Keywords
Wastewater treatment; Sludge; Circular economy; Fertilizer; Life cycle assessment; Kuwait
Categories
Ask authors/readers for more resources
This study evaluates the environmental value of recirculating nutrients from treated sewage sludge to agricultural soils for growing forage, compared to landfilling and incineration. Life cycle assessment methodology is used with consequential and open loop modeling, following ISO 14044 and ILCD standards. The results show a reduction in environmental burden by avoiding virgin nitrogen production in favor of its recirculated counterpart.
The objective of this study is to assess the environmental value of recirculating nutrients from treated sewage sludge by application to agricultural soils to grow forage as opposed to landfilling and incineration. The methodological choices are aligned to the circular economy framework using life cycle assessment. Consequential modeling and open loop modeling were adopted and adhere to ISO 14044 and International Reference Life Cycle Data System (ILCD) standards. The functional unit is defined in terms of the amounts of nitrogen (N), phosphorus (P) and potassium (K) recirculated from the treated sewage sludge produced annually in Kuwait. The results indicate a reduction in environmental burden with respect to fossil fuel depletion, metal depletion and climate change. A total of 95% of the reduction is realized by avoiding virgin nitrogen production and instead using its recirculated counterpart. Considerable amounts of natural gas, coal, dinitrogen monoxide (nitrous oxide, N2O) and copper are consumed during virgin N fertilizer production.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available