Use of spray nozzles to recover dissolved methane from an Upflow Anaerobic Sludge Blanket (UASB) reactor effluent.

Publisher: IWA Publishing Country of Publication: England NLM ID: 9879497 Publication Model: Print Cited Medium: Print ISSN: 0273-1223 (Print) Linking ISSN: 02731223 NLM ISO Abbreviation: Water Sci Technol Subsets: MEDLINE

Publication: <1998->: London : IWA Publishing
Original Publication: Oxford ; New York : Pergamon Press, 1981-

Methane* ; Sewage*; Anaerobiosis ; Bioreactors ; Waste Disposal, Fluid/methods

Methane is a powerful greenhouse gas and a source of energy. Recovering this gas means lower greenhouse gas emission and potential reduction of energetic costs. The lack of full-scale results, the use of different methodologies to detect dissolved methane (d-CH 4 ) and the fact that no process to remove d-CH 4 from anaerobic effluents is energetically or economically viable at full-scale urged a different approach to the problem. To avoid methodological interference and facilitate comparison of results the Standard Test Method number D8028-17 published by ASTM International can be used to determine d-CH 4 . The use of real anaerobic reactor effluent also helps results to be compared. In this study, 80 samples from a full-scale anaerobic reactor showed an average concentration of dissolved methane of 14.9 mg·L ^-1 , meaning an emission of 229 kg of CO 2 eq·h ^-1 and an average of 113.5 kW wasted. Using spray nozzles, an alternative to the methods being researched, the average methane recovery was 11.5 mg·L ^-1 of CH 4 , an efficiency of 81.6%, meaning 177 kg of CO 2 eq·h ^-1 emissions avoided and 87.9 kW of recoverable energy.

0 (Sewage)
OP0UW79H66 (Methane)

Date Created: 20220315 Date Completed: 20220317 Latest Revision: 20220317

20231215

wst_2022_028

10.2166/wst.2022.028

35290230