Bench-Scale Evaluation of Hydrothermal Processing Technology for Conversion of Wastewater Solids to Fuels

Autor: P A, Marrone, D C, Elliott, J M, Billing, R T, Hallen, T R, Hart, P, Kadota, J C, Moeller, M A, Randel, A J, Schmidt
Rok vydání: 2018
Předmět:
Zdroj: Water environment research : a research publication of the Water Environment Federation. 90(4)
ISSN: 1061-4303
Popis: Hydrothermal Liquefaction (HTL) and Catalytic Hydrothermal Gasification (CHG) proof-of-concept bench-scale tests were performed to assess the potential of hydrothermal treatment for handling municipal wastewater sludge. HTL tests were conducted at 300 to 350 °C and 20 MPa on three different feeds: primary sludge, secondary sludge, and digested solids. Corresponding CHG tests were conducted at 350 °C and 20 MPa on the HTL aqueous phase output using a ruthenium-based catalyst. Biocrude yields ranged from 25 to 37%. Biocrude composition and quality were comparable to biocrudes generated from algae feeds. Subsequent hydrotreating of biocrude resulted in a product with comparable physical and chemical properties to crude oil. CHG product gas methane yields on a carbon basis ranged from 47 to 64%. Siloxane concentrations in the CHG product gas were below engine limits. The HTL-CHG process resulted in a chemical oxygen demand (COD) reduction of99.9% and a reduction in residual solids for disposal of 94 to 99%.
Databáze: OpenAIRE