Abstract：
:Free nitrous acid (FNA) has been shown to enhance the biodegradability of waste activated sludge (WAS) but its effectiveness on the pre-treatment of mixed sludge is not known. This study explores the effectiveness of four different FNA concentrations (0, 2.49, 3.55, 4.62mgN-HNO2/L) and three exposure times (2, 5, 9h) lower than the ones reported in literature (24h) on WAS characteristics and specific methane production (SMP). FNA pre-treatment reduced sludge cell viability below 10% in all cases after an exposure time of 5h, increasing the solubility of the organic matter. The treated mixed sludge was used as substrate for the biochemical methane production tests to assess its SMP. Results showed a significant increase (up to 25%) on SMP when the sludge was pretreated with the lowest FNA concentration (2.49mgN-HNO2/L) during 2 and 5h but did not show any improvement at longer exposure times or higher FNA concentrations.
journal_name
Bioresour Technoljournal_title
Bioresource technologyauthors
Zahedi S,Icaran P,Yuan Z,Pijuan Mdoi
10.1016/j.biortech.2016.06.038subject
Has Abstractpub_date
2016-09-01 00:00:00pages
870-5eissn
0960-8524issn
1873-2976pii
S0960-8524(16)30855-0journal_volume
216pub_type
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