MIL OSI Translation. Region: Russian Federation –
The most important task of the reconstruction is the elimination of unpleasant odors associated with the operation of treatment facilities.
The first stage of the comprehensive reconstruction of the Lyubertsy treatment facilities of JSC Mosvodokanal has been completed in Moscow.
“Wastewater treatment plants are, perhaps, the most invisible part of the work of public utilities, but no less important. The Lyubertsy wastewater treatment plant receives half of Moscow’s effluents and is one of the largest in Europe. Probably the largest wastewater treatment plant “, – said
The decision to carry out a large-scale reconstruction of the Lyubertsy Wastewater Treatment Plant was made in 2020. Among the tasks to be solved are improving the quality of wastewater treatment, full automation of production processes, increasing energy efficiency and introducing waste-free production technologies. Another goal of the renovation was to further minimize emissions of unpleasant odor substances.
“In recent years, a lot of attention has been paid to reconstruction, repair and so on. But nevertheless, in the end, they made a decision on a comprehensive reconstruction of all treatment facilities, on the introduction of the most modern technologies and started this work a year ago, went to the construction site, “added Sergei Sobyanin.
The Mayor of Moscow also congratulated the workers of the housing and communal services on their professional holiday.
“Hundreds of thousands of people work in our city, and everything that we see around is in one way or another connected with the work of the communal, housing complex. We drive through the streets and see cleaned roads, repaired sidewalks, planted trees. All this was done by the workers of the housing and communal services. The light that illuminates our city. We come to the courtyards – the courtyards are also equipped with the hands of housing and communal services. We go into the entrance, see how it is cleaned, how it is lit. We come home and use heat, water, light. Everything is done with your hands, ”he said.
Three million cubic meters of wastewater per day
The Lyubertsy Wastewater Treatment Plant (LOS) occupies an area of 173 hectares – this is one of the largest enterprises of this kind in Europe. They are located in the Nekrasovka area. The VOC includes an old block (built in 1963-1966), two blocks at the Novo-Lyubertsy treatment facilities (built in 1984 and 1996), a biogenic element removal block (built in 2006) and an ultraviolet disinfection block (built in 2007).
The productivity of the Lyubertsy treatment facilities is three million cubic meters of water per day. Thanks to the active introduction of water-saving technologies in the urban economy of Moscow, the actual inflow of wastewater from 2010 to 2020 decreased by 40 percent – to 1.5-1.8 million cubic meters per day.
Industrial and domestic wastewater is supplied to VOCs from the northwestern, northern, northeastern and eastern sectors of Moscow, as well as from such cities near Moscow as Khimki, Dolgoprudny, Mytishchi, Balashikha, Reutov, Lyubertsy.
The Lyubertsy treatment facilities operate according to the traditional wastewater treatment scheme, which includes mechanical and biological treatment: the wastewater passes through mechanical grates with openings of five and six millimeters, then sand traps, primary sedimentation tanks, aeration tanks and secondary sedimentation tanks. Part of the purified water is additionally disinfected with ultraviolet radiation.
Waste, which has been caught by mechanical rake screens, is dumped by conveyors into hydraulic washing presses, then it is unloaded into containers and taken to the landfill.
The sludge that forms during water purification goes through several stages of treatment, including methane digestion and mechanical dehydration. After that, it is processed into artificial biosoil and used for reclamation of quarries and landfills of solid domestic waste.
VOCs have been modernized for over 10 years. We went through the following stages:
– in 2006, a biogenic element removal unit with a capacity of 500 thousand cubic meters per day was put into operation;
– in 2007, the first block of ultraviolet disinfection of treated waste water was put into operation. Its productivity is one million cubic meters per day;
– in 2013, a biogas thermal power plant with a capacity of 10 megawatts was put into operation. It provides over 50 percent of the electricity needs of the Lyubertsy Wastewater Treatment Plant;
– in 2013–2017, the main sources of odor were closed;
– in 2017, the mechanical sludge dewatering workshops were reconstructed.
Five stages of reconstruction
Reconstruction of the Lyubertsy Wastewater Treatment Plant is divided into five stages. At the same time, the enterprise continues to work.
The first stage of reconstruction was completed in March 2021. In the course of work, they built:
– a building for mechanical wastewater treatment with additional blocks of thin grids. They allow you to more thoroughly separate wastewater from associated waste;
– new receiving chambers of the first and second blocks;
– new supplying sewer channels;
– unit for decontamination and dehydration of garbage, which is retained in protective gratings;
– 12 new grit traps for the separation of fine impurities;
– 13 additional gas cleaning units to eliminate unpleasant odors.
“The first stage of work has been completed, the mechanical cleaning and sand catcher shop, where we are located, has been put into test operation,” said Alexander Ponomarenko, General Director of Mosvodokanal.
At the second stage, it is planned:
– to build the first block of treatment facilities;
– to repair the primary sedimentation tanks of the second and third stages;
– to build biological water treatment facilities (aeration tanks, secondary sedimentation tanks, centrifuges of the sludge thickening workshop, sludge pumping station), a channel for purified water;
– to build facilities for acidification of raw sludge in the first block;
– to reconstruct the main machine room of the VOC.
QUOTE “The second stage, the largest, is also 60 percent completed. Mechanical treatment facilities have been built, and active construction has already begun, as I have already said, most of the work on the first block of treatment facilities has already been completed. But also during 2021, 2022, 2023, the entire reconstruction of the treatment facilities should be completed. These will be new treatment facilities, with completely new environmental criteria, quality, standards both for the atmosphere and smells, and for water discharges – it will be much cleaner. Taking into account the fact that hundreds of thousands of people live around – residents of the Moscow region and residents of Moscow – of course, this is also an important environmental project, “the Moscow Mayor said.
The third stage will include the following works:
– creation of a system for removing nitrogen compounds using the Anammox technology (using specific bacteria) to remove nitrogen;
– construction of facilities for the removal of phosphorus to obtain mineral fertilizers;
– construction of a unit for heat recovery of the digested sludge (use of the released heat in production processes).
At the fourth stage, it is planned to build a second block of treatment facilities. For this you have to:
– to repair six primary sedimentation tanks of the Novo-Lyubertsy treatment facilities;
– to reconstruct aeration tanks and secondary sedimentation tanks;
– to build a sludge thickening shop and acidification facilities;
– to build a microfilter post-treatment plant with a capacity of one million cubic meters per day.
The fifth stage includes the construction of facilities for the disinfection of treated water with ultraviolet radiation with a capacity of one million cubic meters per day.
During the reconstruction of the VOC, specialists will apply a variety of innovative technological solutions, some of which are for the first time in Russia. For example, a two-stage waste removal from wastewater will improve the reliability of mechanical cleaning, increase waste removal by 50 percent and reduce labor costs for repair work. Construction of aeration tanks using technologies for deep removal of nitrogen and phosphorus will allow achieving the best quality of wastewater treatment.
In the course of pre-design developments, it was decided to abandon the outdated technology of compaction of excess activated sludge in sludge compactors and switch to the technology of thickening of activated sludge in centrifuges. It is widely used in Europe and helps to eliminate phosphorus from the centrate (liquid removed during dehydration).
The construction of a new ultraviolet disinfection unit with a capacity of one million cubic meters per day will make it possible to disinfect 100 percent of wastewater that VOC discharges into water intakes. And thanks to energy-efficient solutions, it will be possible to save up to 13,500 megawatts per year on biological treatment processes.
For the first time in Russia, such technological solutions will be applied as:
– acidification (removal of phosphorus using organic compounds);
– purification of return flows from phosphorus. This will help reduce the load on structures, achieve deeper water purification, and at the same time obtain ecological mineral fertilizers;
– purification of return flows using the Anammox technology (using specific bacteria). The technology will increase the degree of wastewater treatment from nitrogen compounds and reduce the nitrogen load by up to 30 percent.
In the future, the concept of VOC development involves the creation of systems for processing sewage sludge into biofuel and the refusal of its disposal at landfills (waste-free production).
Elimination of unpleasant odors
The most important task of VOC reconstruction is the elimination of unpleasant odors associated with the operation of treatment facilities. To do this, in 2013-2017, 73.4 thousand square meters (area of 10 professional football fields) were blocked off the main sources of odor: primary wastewater settling tanks, supply channels, receiving chambers, sand traps and sludge compactors.
As at the Kuryanovsk wastewater treatment plant, an original development of Russian engineers was introduced at the VOC settling tanks – flat floating ceilings (covers that rise and fall depending on the water level in the sedimentation tanks). Unlike traditional dome-type slabs, flat ones are more compact and economical. Their installation does not require the construction of expensive supports and foundations. The release of hydrogen sulfide (the main source of unpleasant odor) into the air as a result of the installation of floating floors is reduced by 90–95 percent.
History of the issue
Clean water: we talk about the updated Kuryanovsk structures https://www.mos.ru/news/item/38308073/
In addition, as part of measures to eliminate unpleasant odor on VOCs:
– 35 installations for cleaning ventilation emissions were installed. Their efficiency of air purification from hydrogen sulfide is 99 percent. It is planned to install another 22 Ventlit-type installations with a total capacity of 125 thousand cubic meters;
– 79.3 thousand square meters of structures were decommissioned. Among them there are 18 compactors for fermented sludge;
– a single sludge treatment center was created, outdated filter presses were replaced with nine modern high-performance centrifuges (decanters);
– two automated air monitoring stations were opened.
In the future, it is planned to take additional measures to combat odors:
– to build a new unit for processing coarse impurities with processing and disinfection of waste;
– store and transport waste in a closed form in special press-compactors;
– to install 22 additional units of gas cleaning equipment;
– to reconstruct the primary sedimentation tanks, modernize the floors and install an additional gas purification system;
– to divert gases to gas treatment plants at all structures under construction and VOC channels.
Thanks to the implementation of a set of measures to eliminate unpleasant odors at the Lyubertsy Wastewater Treatment Plant, the quality of life of about two million residents of Moscow and the Moscow Region is improving, who, depending on the direction of the wind, periodically experienced discomfort.
EDITOR’S NOTE: This article is a translation. Apologies should the grammar and or sentence structure not be perfect.