Engineering aspects of arranging odor removal at the wastewater treatment facilities of Mosvodokanal JSC

Summary

The arrangement of odor removal at the wastewater treatment facilities is a technically challenging and expensive task. In the process of the implementation a number of problems arise that the technical staff of the treatment facilities has not previously run into. The experience of Mosvodokanal JSC in implementing the odor removal program at the wastewater treatment facilities in Moscow is discussed. Currently, as part of the comprehensive upgrade of the main treatment facilities – Kurianovskie, Liuberetskie, Zelenogradskie and Butovskie, as well as during the construction of new small and medium-sized wastewater treatment facilities in New Moscow, the necessary covering of open storage tanks is being carried out. The systems for collecting vent emissions from under the cover are equipped with modern air ventilation systems for removing malodorous substances. At present, the total background of emissions of malodorous substances on the premises of the treatment facilities has been reduced dozens of times providing for the elimination of odors over the nearby areas of the city. In 2021 it is planned to complete the entire set of measures to remove malodorous substances at the Kurianovskie and Liuberetskie wastewater treatment facilities of Mosvodokanal JSC.

Key words

malodor emissions , atmospheric air quality regulations , physical and chemical methods of malodor control , photosorption-catalytical method , cover of the storage tanks , floating covers

Methods of odor control in the systems of wastewater transportation and treatment

Summary

At present odor is considered as an environmental pollution factor that produces a negative impact on human being. In the urban environment one of the main odor releasing sources are the facilities for wastewater transportation and treatment. The advanced approaches to the odor regulation and control at the wastewater treatment facilities are considered. The basic requirements to the methods of odor control are formulated. A review of the most widely used methods – thermal, biological, chemical (including ozonation), sorption, photocatalytical, electrodischarge, direct photolysis, is presented. Practical use of these methods showed that none of them used separately provided for meeting the requirements set to malodor control in the systems of wastewater transportation and treatment; therefore combinations of different methods shall be used. Examples of industrial-scale approbations of the combined most dynamically developing photosorption-catalytical method are given.

Key words

malodor emissions , atmospheric air quality regulations , olfactometry , physical and chemical methods of malodor control , photosorption-catalytical method

On the choice of methods for removing malodorous substances from vent emissions of the transportation and wastewater treatment system

Summary

Over the past seven years, Mosvodokanal JSC has been actively implementing a program on eliminating the emission of malodorous substances at the wastewater transportation and treatment facilities: wastewater treatment facilities, wastewater pumping stations, etc. As part of the program, the necessary covering of open storage tanks (receiving chambers, discharge canals, grit chambers, primary settling tanks, etc.). Various methods of removing malodorous substances have been approbated including experimental-industrial and pilot tests. Based on the results of the field trials of various installations for removing malodorous substances from air, as well as with account of the technical and economic assessment of the operating costs, Mosvodokanal JSC is introducing sorption systems based on the photosorption-catalytic purification method. The implementation of the program ensured a tenfold reduction in the general background of malodorous substances on the premises of the facilities providing for the elimination of odors in the nearby residential areas of the city.

Key words

biofilter , adsorption , scrubber , atmospheric air quality regulations , photosorption-catalytical method , industrial methods of removing malodorous substances , cost of removing malodorous substances , electric-discharge technologies