A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Sustainable Autarky of Food-Energy-Water (Safe-Water)
Abstract Urban wastewaters (UWW) are now being recognized as a resource, rich in nutrients and energy, rather than a waste stream that has to be treated and disposed of at the input of considerable energy and associated environmental emissions. This paper presents an algal-based approach for treating UWWs to the mandated discharge levels in a single step and at the same time, recover net energy, nutrients, and water from UWWs for use in the food-energy-water sectors. The proposed approach entails cultivation of energy-rich algal biomass in primary-settled UWW, followed by hydrothermal liquefaction of the resulting algal biomass to recover its energy- and nutrient-contents. Results from a pilot scale field demonstration project are presented to demonstrate the feasibility of this approach. The pilot scale study conducted at a local wastewater treatment plant confirmed that the discharge standards for biochemical oxygen demand (BOD), nitrogen, and phosphorous could be met with a batch process time of 3 days. Recovery experiments showed that more than 20% of the ammoniacal nitrogen (N-NH3) and more than 90% of the phosphorous (P) in the primary-settled wastewater could be recovered as struvite by the proposed process.
Sustainable Autarky of Food-Energy-Water (Safe-Water)
Abstract Urban wastewaters (UWW) are now being recognized as a resource, rich in nutrients and energy, rather than a waste stream that has to be treated and disposed of at the input of considerable energy and associated environmental emissions. This paper presents an algal-based approach for treating UWWs to the mandated discharge levels in a single step and at the same time, recover net energy, nutrients, and water from UWWs for use in the food-energy-water sectors. The proposed approach entails cultivation of energy-rich algal biomass in primary-settled UWW, followed by hydrothermal liquefaction of the resulting algal biomass to recover its energy- and nutrient-contents. Results from a pilot scale field demonstration project are presented to demonstrate the feasibility of this approach. The pilot scale study conducted at a local wastewater treatment plant confirmed that the discharge standards for biochemical oxygen demand (BOD), nitrogen, and phosphorous could be met with a batch process time of 3 days. Recovery experiments showed that more than 20% of the ammoniacal nitrogen (N-NH3) and more than 90% of the phosphorous (P) in the primary-settled wastewater could be recovered as struvite by the proposed process.
Sustainable Autarky of Food-Energy-Water (Safe-Water)
Khandan, N. (author) / Tchinda, D. (author) / Henkanatte-Gedera, S. M. (author) / Abeysiriwardana-Arachchige, I. S. A. (author) / Delanka-Pedige, H. M. K. (author) / Munasinghe-Arachchige, S. P. (author) / Zhang, Y. (author)
2019-08-07
8 pages
Article/Chapter (Book)
Electronic Resource
English
Algal wastewater treatment , Energy recovery , Nutrient recovery , Mixotrophic algal growth , Pilot scale demonstration Energy , Sustainable Architecture/Green Buildings , Civil Engineering , Sustainable Development , Climate Change/Climate Change Impacts , Water Policy/Water Governance/Water Management , Information Systems Applications (incl. Internet)
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