Covered anaerobic ponds
In the past decade, synthetic floating covers on
anaerobic ponds have been installed worldwide to
trap odour and biogas (Dague et al., 1990; Safley &
Westerman, 1992). These systems occupy a niche
between existing anaerobic ponds on the one hand
and the more sophisticated high-rate anaerobic systems
on the other. Compared to traditional,
uncovered anaerobic ponds, covered ponds offer the
performance of the former, but reduce odour
release and permit the capture of the methane-rich
gas. The main advantage of this technology compared
to traditional digesters is the lower capital
costs