Chemical removal of malodorous substances at the wastewater treatment facilities

Summary

The removal of foul smells (malodorous substances) in domestic and industrial wastewater treatment systems has been a significant problem being solved in all the developed countries by known methods including chemical treatment of raw sludge. This paper presents the results of pilot tests of VTIAMIN ST-15 domestic complex chemical to prevent the occurrence and spread of foul smells at the wastewater treatment facilities of the Municipal Unitary Enterprise Domodedovo Vodokanal by binding hydrogen sulfide and light mercaptans. Control of the state of the ambient air in the working area was carried out by measuring the concentrations of hydrogen sulfide and, occasionally, of methyl mercaptan. In the course of pilot tests, the effectiveness of chemical treatment was proven, and confirmed by the analyses of an independent laboratory. At a chemical dose of 300 g per ton of sludge with a moisture content of 98–99%, introduced during the periods of discharging raw sludge and excess activated sludge onto the sludge beds, the concentrations of hydrogen sulfide and methyl mercaptan in the working area decreased to the established standards; and after drying on sludge beds for 3.5 months the concentration of these substances in the ambient air did not exceed 0.5 MPC.

Key words

malodorous emissions removal , biological treatment facilities , sludge treatment with activated sludge , VTIAMIN ST-15 chemical

Reconstruction of the Novo-Kur’ianovo wastewater treatment facilities

Summary

The Kur’ianovo wastewater treatment facilities are the European biggest municipal wastewater treatment complex. Being an advanced project for its time (1970-ies) by the XXI century the Kur’ianovo wastewater treatment facilities turned to be obsolescent and needed upgrading. In 2010 the project of upgrading the first and second blocks of the Novo-Kur’ianovo wastewater treatment facilities was launched. The specific features of the design solutions of recovering the capacity of the engineering structures of buildings and facilities of the wastewater treatment plant, of retrofitting nutrients removal process are considered alongside with the aspects of reducing malodorous emissions from the open surfaces of the facilities. Special attention in the project is paid to the selection of process equipment – advanced sludge scrapers, sludge pumps, turboblowers and aeration systems were installed. For the first time floating covers of the primary settling tanks were applied.

Key words

sedimentation tank , aeration , wastewater treatment , sludge disposal truck , sludge scraper , nitrification-denitrification , dephosphatization , aeration tank , acidoficator , malodorous emissions removal , floating cover