Odour Causes :
Any place or process in which wastewater is collected, conveyed or treated has the potential to generate and release nuisance odours to the surrounding area. In most instances, the odours associated with collection systems and primary treatment facilities are generated as a result of an anaerobic or "septic" condition. This condition occurs when oxygen transfer to the wastewater is limited such as in a force main. In the anaerobic state, the microbes present in the wastewater have no dissolved oxygen available for respiration. This allows microbes known as "sulphate-reducing bacteria" to thrive. These bacteria utilize the sulphate ion (SO4-) that is naturally abundant in most waters as an oxygen source for respiration. The by product of this activity is hydrogen sulphide (H2S). This by product has a low solubility in the wastewater and a strong, offensive, rotten-egg odour. In addition to its odour, H2S can cause severe corrosion problems as well. Due to its low solubility in the wastewater, it is released to the atmosphere in areas such as wet wells, head works, grit chambers and primary clarifiers. There are typically other "organic" odorous compounds, such as mercaptans and amines, present in these areas, but H2S is the most prevalent compound.
Solids handling facilities are another significant odour problem area. In bio solids dewatering and treatment processes, the bio solids commonly undergo extreme turbulence, pH adjustment and/or thermal treatment. Depending on the nature of the bio solids stream and the treatment used, the odour compounds released can consist of any combination of the following compounds in a wide range of concentrations: ammonia, amines, hydrogen sulphide, organic sulphides and mercaptans.
Odour Control Methods:
There are many different technologies that can be applied to control odours from wastewater collection and treatment systems. These technologies can be split into two main groups: vapour-phase technologies, used to control odorous compounds in the air or gas; and liquid-phase technologies, used to control odorous compounds in the liquid wastewater itself. Vapour-phase technologies typically are used in point-source applications such as wastewater treatment plants and pump stations or for the treatment of biogas. Liquid-phase technologies typically are used in collection systems where control of both odours and corrosion are concerns and/or where multiple point odour control is an objective.
Our company is highly experienced in both technologies and offer solutions ranging from simple addition of odour destroying chemicals to building highly sophisticated gas scrubbers and&/or Bio Filter systems.
If you have any odour problem in your treatment plant or sewer lines, just get in touch with us and we will be more than happy to serve you