Controlling malodorous emissions of wastewater treatment facilities

Summary

Wastewater treatment facilities feature malodorous emissions into the atmosphere that result from the process of wastewater treatment and contain mercaptans, hydrogen sulfide, ammonia, amines etc. The preventive measures against negative impact of malodorous emissions on the urban development include two stages: collection of the polluted emissions and their subsequent purification. Preventing emissions into the atmosphere and collecting gases are carried out by installing covers on the aeration facilities. The advanced and technically perfect method of air purification is used in «Iatagan» gas converters. The principle of «Iatagan» units operation is based on the combined effect of bulk barrier-streamer discharge and ozone on the molecules of hazardous and malodorous gases. The use of «Iatagan» gas converters is the best solution of the air purification problem at the wastewater treatment facilities.

Key words

air cleansing , sewerage treatment facilities , malodorous emissions , ozone , gas converter

Control over Reeking Emissions from Sewerage Facilities

Summary

The Yatagan plant used for treatment of air for gases generated at sewerage treatment facilities is described. This equipment has been developed by the Ecopromika Co. in cooperation with scientists of the M. V. Lomonosov Moscow State University and the D. I. Mendeleev Russian University of Chemistry and Technology.

Key words

sewerage , hazardous substances , reeking substances , air cleansing , cold discharges , electrocleaning of gases

Why is ozone not used in world practice to control odors
from the wastewater disposal system?

Summary

The reasons that limit possible using ozone to remove hydrogen sulfide and other malodorous substances coming from the wastewater treatment facilities and wastewater pumping stations are analyzed. It is shown that one of the main disadvantages is the long time required to remove malodorous substances to the required low concentrations. The main reaction of ozone interacting with hydrogen sulfide is presented, its rate is analyzed, and it is shown that the typical duration of the reaction ranges from tens of minutes to several hours. The difficulties of using ozone to remove hydrogen sulfide, associated with the chemical resistance of the latter, are presented. The ozone concentrations required for the effective cleaning, and the number of ozone molecules consumed to remove one hydrogen sulfide molecule are estimated. Data are provided on the use of ozone to remove volatile organic compounds, including phenol and formaldehyde. Issues related to the disposal of reaction products and safety precautions of ozone use are also discussed.

Key words

ozonization , air cleansing , sewerage treatment facilities , hydrogen sulfide , ozone , odors