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Pyrolysis can lower the environmental impacts and improve resource utilization. A multi-stage comprehensive assessment model was developed to assess the economic feasibility of sludge pyrolysis. The indicator of gross process yield was used to evaluate the energy conversion efficiency of the different pathways. A comprehensive techno-economic analysis was used to quantify the technical and economic performance of the pathway through uniform monetary measurement standards. Sensitivity analysis was used to determine the uncertainty and risk. The pathway with the highest gross process yield was selected to assess the feasibility using comprehensive techno-economic analysis considering different value. The estimated break even selling price of bio-oil was very close to the average crude oil of recent five years when considering economic, social, and environmental value. The main key factors affecting the economics of system were crude oil price, bio-oil lower heating value, bio-oil yield, and energy consumption of the pyrolysis process. [ABSTRACT FROM AUTHOR]

To improve nutrients removal from real centrate wastewater and enhance the microalgae biomass production, cultivation of Chlorella vulgaris in lab and a pilot-scale photobioreactor with waste glycerol was studied. The results showed the optimal concentration of the crude glycerol was 1.0 g L −1 with the maximum biomass productivity of 460 mg L −1 d −1 TVS, the maximum lipid content of 27%, the nutrient removal efficiency of all above 86%, due to more balanced C/N ratio. The synergistic relationship between the wastewater-borne bacteria and the microalgae had significant good influence on nutrient removal. In pilot-scale wastewater-based algae cultivation, with 1 g L −1 waste glycerol addition, the average biomass production of 16.7 g m −2 d −1 , lipid content of 23.6%, and the removal of 2.4 g m −2 d −1 NH 4 + -N, 2.7 g m −2 d −1 total nitrogen, 3.0 g m −2 d −1 total phosphorous, and 103.0 g m −2 d −1 of COD were attained for 34 days semi-continuous mode. [ABSTRACT FROM AUTHOR]