Abstract
The concept of treating low strength municipal wastewater and the resultant sludge in a single unit was tested using a synthetic feed and two anaerobic filters. These two filters were started-up separately using a stepped incremental loading until an organic loading rate (OLR) of 4 kg COD m−3 d−1 was achieved. The integrated double filter unit (i.e. operated in series) was then operated at this OLR until steady state had been achieved. The process was then operated at OLRs of 3, 4, 6 and 8 kg COD m−3 d−1 and at each rate the sequence of primary and secondary filters was alternated. An examination of the specific methane yields showed that the secondary digesters produced more gas than the theoretical value based on COD. An examination of the biomass in the filters showed the secondary digester contained less biomass than the primary digester. Taken together these results suggested that sludge digestion was taking place in the secondary digester and that the concept of AADF merited further evaluation.
Original language | English |
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Pages (from-to) | 337-342 |
Number of pages | 6 |
Journal | Environmental Technology (United Kingdom) |
Volume | 20 |
Issue number | 3 |
DOIs | |
Publication status | Published - 1 Mar 1999 |
Externally published | Yes |
Keywords
- Anaerobic digestion
- Double filtration
- Sewage treatment