Odor Control in Sewage plants

Odor Control

Odor Control in Sewage plants

The Municipal Sewage Plant in Lillesand, Norway, with operator Rune Eriksen (1993).

All anaerobic sewage plants have odors of mercaptans, hydrogen sulphides and methane, to mention but a few. In addition bacteria is all over. It is further known that operators exposed to such gases and some bacteria suffer in long terms exposures.

Miltec is now looking into a new process with the intent to produce an odor free plant and where the deposited sludge is also odor free.

There are numbers of well-known chemical processes to do so, from injection of air/oxygen into the tanks, to addition of oxidative chemicals.

The first technique is cheap but less effective. Addition of chemicals is effective but expensive.

Miltec did in 1993 a test where hydrogen-per-oxide was added to the incoming sewage water. This eliminated the odors completely, the sedimentation became more effective and the consumption of additive chemicals was minimized.

The use of hydrogen-per-oxide was abundant due to the hazards risk, as it is a very oxidative chemical and only to be handled by experts.

However, new techniques have been developed and results will be published later.