Bad odors and prevention of formation of Hydrosulfuric Acid (H2S)
Odor pollution is a subject of increasing concern as a cause of discomfort to the population, especially in activities where its most direct environmental impact (solid waste treatment, water purification, etc.) has been progressively reduced. Less attention has traditionally been devoted to gaseous emissions than to liquid and solid emissions, mainly because of the greater risk to human health of the first two. In the case of bad smells are not necessarily accompanied by health effects, although they may be problem generators by directly affecting the quality of life of people, heighten tensions, etc.
The cause of this contamination lies in the release into the atmosphere of certain compounds (volatile organic compounds, nitrogen compounds, amines, …, sulfur compounds, sulfhydric, mercaptans, etc.), even in very low concentrations can cause olfactory discomfort, being able to cause them in points very far from the potential zone of emission. Naturally, the atmosphere plays a fundamental role in this type of olfactory impacts, as it is the vehicle of transmission of species that generate bad smells, as well as enhance or decrease the incidence of them. As with any other chemical species released into the atmosphere, the effective dispersion depends on the atmospheric processes that develop in the surface strata, which in turn are strongly conditioned by the orographic environment and terrain coverage. The treatment of wastewater involves numerous phases, which starts already from the sewerage network and collectors, some of them open to the atmospheric environment, which allows the transfer of those substances that cause the problem of bad smells, generally associated to anaerobic processes. Although fresh sewage emits substances that cause bad smells, most of the chemical species typically associated with these problems originate in environments where all the oxygen and nitrates available in dissolution (anaerobic fermentation conditions) have been consumed. On the other hand, the transfer of substances to the atmospheric environment depends on several factors, including the substance’s own concentration in water, volatilization coefficients, ambient temperature, plant design, etc. Although hydrogen sulfide in isolation is not a sufficient measure of the generation of bad odors due to a water treatment plant, it could be considered that its concentration could generate a very characteristic rotten egg odor.
The hazards of hydrogen sulfide or hydrosulfuric acid in drainage or sewer systems are presented in the following table:
H2S Exposure Limits:
Hydrogen sulphide concentration in the air (ppm): Human Reactions
- 0,2: Odor treshold
- 3 - 5: Strong odor
- 7: Maximum limit on concentration for 8 hour working time
- 10 - 50: Eye Irritation
- 50 - 100: Respiratory system irritation
- 100 - 200: Cough, eye pain and headache
- 300 - 500: Constant life risk
- 500 - 700: Severe irritation of nervous system
- >700: Immediate fainting with breathing paralysis - Death
Activated Carbon Filter Sewage
SUGARPOD activated carbon filters produced by IVERNA are designed to eliminate various types of odors from the sewage system, inspection chambers, septic tanks, wastewater treatment plants, pumping stations … The main function of anti-odor active carbon filters from IVERNA is to minimize the effects of chemicals (odorous and odorless) from sewage systems. Due to the high absorption capacity of the impregnated activated carbon used in the filters, it is possible to return to a daily life without worrying about unpleasant odors. The carbon based material is converted to activated carbon by thermal decomposition using controlled atmosphere and heat. The resulting product has a large surface area per unit volume, and a network of submicroscopic pores where absorption takes place.
IVERNA provides the solution for the operators of large drainage systems and individual wastewater systems both for odors generated during transportation, as well as for their storage and purification.
The anti-odor active carbon filters are also completely maintenance-free and easy to install. They are made of PE-HD plates and pipes of long duration, resistant to the corrosion and dangerous substances guaranteeing an efficient and long-term operation.
SUGARPOD activated carbon filter for wells and manholes: Quick and easy installation under the manhole covers. Minimal maintenance and different sizes to fit perfectly to the opening of each manhole cover.
Active charcoal filter SUGARPOD in chimney: Specially designed for septic tanks, with high resistance PE-HD pipe. We have a chimney version with direct installation on the floor in the opening or exit of air, and another internal version to install in existing chimneys of concrete.