PURPOSE, TYPES OF PURIFICATION FACILITIES AND CLEANING METHODS

Man uses water in the course of his life for various needs. With its direct use, it becomes contaminated, its composition and physical properties change. For the sanitary well-being of people, these effluents are diverted from settlements. In order not to pollute the environment, they are processed at special complexes.

Fig.7 Wastewater treatment plant of OAO Tatspirtprom Usad distillery Republic of Tatarstan 1500 m3/day

Cleaning steps:

• mechanical;
• biological;
• deep;
• UV disinfection of wastewater and further release into the reservoir, dehydration and disposal of sediments.

Production of beer, juices, kvass, various drinks

Cleaning steps:

• mechanical;
• physical - chemical;
• biological and further release into the mining collector;
• collection, dehydration and disposal of sludge.

Also read articles on this topic.

STORM WASTE TREATMENT FACILITIES

VOC is a combined tank, or several separate tanks for the treatment of storm and melt runoff. The qualitative composition of storm drains is mainly oil products and suspended solids from industrial production and residential areas. They, according to the law, must be cleared to VAT.

The device of stormwater treatment facilities is being modernized every year, due to an increase in the number of cars, shopping centers, and industrial sites.

A standard set of equipment for storm water treatment plants is a chain of a distribution well, a sand separator, a gasoline oil separator, a sorption filter and a sampling well.

Many companies currently use a combined wastewater treatment system. Single-case VOC is a container divided inside by partitions into sections of a sand trap, an oil trap and a sorption filter. In this case, the chain looks like this: a distribution well, a combined sand and oil trap and a sampling well. The difference is in the area occupied by the equipment, in the number of containers and, accordingly, in price. Free-standing modules look bulky and are more expensive than single-case ones.

The principle of operation is as follows:

After precipitation or snow melt, water containing suspensions, oil products and other contaminants from industrial sites or residential (residential) areas enters the gratings of rainwater wells and then collects through collectors in an averaging tank if storage-type VOCs are present, or immediately after a distribution well are fed to storm sewer treatment plants.

The distribution well serves to send the very first dirty drain for cleaning, and after a while, when there is no more pollution on the surface, the conditionally clean drain through the bypass line will be discharged into the sewer or into the reservoir. Storm drains pass the first stage of treatment in a sand trap, in which gravitational settling of insoluble substances and partial ascent of free-floating oil products take place. Then, through the partition, they flow into the oil trap, in which thin-layer modules are installed, due to which suspended substances settle to the bottom along the inclined surface, and most of the oil particles rise to the top. The last stage of cleaning is a sorption filter with activated carbon. Due to sorption absorption, the rest of the oil particles and small mechanical impurities are captured.

This chain allows you to provide a high degree of purification and discharge purified water into the reservoir.

For example, for oil products up to 0.05 mg/l, and for suspended solids up to 3 mg/l. These figures fully comply with the current standards governing the discharge of treated water into fishery reservoirs.

SEWAGE TREATMENT FACILITIES FOR THE VILLAGE

Currently, a large number of autonomous settlements are being built near megacities, which allow you to live in comfortable conditions "in nature", without breaking away from the usual city life. Such settlements, as a rule, have a separate water supply and sewerage system, since there is no way to connect to the central sewerage system. The compactness and mobility of such treatment stations avoids huge installation and construction costs.

However, despite their small size, the modules contain all the necessary equipment for complete biological treatment and disinfection of wastewater to achieve the quality indicators of treated wastewater that meet the requirements of SanPiN 2.1.5.980-00. The undoubted advantage is the complete factory readiness of block containers, the simplicity of their installation and further operation.

WASTE PLANTS FOR THE CITY

Large city - large sewage treatment facilities of KOS. It is logical, because the consumption of wastewater entering for processing directly depends on the number of inhabitants: the rate of water disposal is equal to the rate of water consumption. And for a large volume of liquid, appropriate containers and reservoirs are needed. This fact generates interest in the design and operation of such CSSs.

When designing the sewer networks of a settlement, the load on the pipelines is taken into account, which are selected based on the passage of the required amount of runoff. In order not to bury pipes of a very large diameter, through which the contaminated liquid would be transported to the vast areas of treatment facilities, several wastewater treatment plants are being built in large cities.

Thus, the metropolis is divided into several "cities" (districts), and a treatment station is designed for each of them.

A clear example is the treatment facilities in the capital of Russia, among which there are Lyubertsy with a capacity of 3 million m 3 / day - the largest in Europe. The main block is the old modernized OS, providing half of the power of the station, the other two blocks - 1 million m 3 / day and 500 thousand. m 3 / day.

The peculiarities of the construction of such wastewater treatment plants are the increased size of structures compared to the sewage system of other cities: sedimentation tanks with a diameter of 54 meters, and channels comparable to small rivers.

From the point of view of technology, everything is standard: mechanical cleaning, settling, biological treatment, secondary settling, disinfection. You can read on our website.

The main feature is only in what form the structures have for these stages of processing. For example, Moscow, as you know, was not built immediately, but it has always been a great source for treatment facilities. Reinforced concrete structures were built, which today have undergone several reconstructions and upgrades. Due to the decrease in the amount of diluted clean water, some of the previously built facilities are mothballed or used for other purposes. This is also the peculiarity of the OS device: the old sand trap channels become an intermediate reservoir, the aeration tank corridor is transformed and works a little differently.

The main thing that significantly distinguishes the OS of large cities from their smaller brothers is closed structures.

In other words, a roof is mounted on all structures built in the 60-70s. This is done in order to eliminate the smell that can spread to new buildings, which, in turn, have arisen due to the geographical expansion of the metropolis. And if earlier the wastewater treatment plant was significantly removed from the city, now it is located near new residential complexes.

For the same reason, sprayers are installed on such OSes, which release special substances that neutralize the odors of wastewater.

Any treatment plant is a complex interconnection of processes. Of course, they will cope with their task 100%, but there is no need to complicate their work. Waste - in the trash, plumbing - for its intended purpose.

Water disposal- a complex of technological processes, engineering structures and equipment for the removal of waste, storm and melt water from settlements, industrial facilities, agriculture and transport infrastructure.

Water disposal should be considered in two aspects - the actual removal of wastewater from the place of formation to the place of discharge and the treatment of wastewater before being discharged into a water body.

The history of the development of wastewater disposal in Russia is relatively young - no more than two centuries ago, with the advent of low-rise construction and dense urban development, goldmen appeared on the streets - professional collectors of sewage, which were taken out of the city in barrels. The Zolotar case was replaced by a sewer network for the discharge of sewage, i.e. household and household wastewater into the river flowing through the city. Water disposal into a water body was first carried out without treatment, by the end of the 19th century. with cleaning in the filtration fields and only in the 30s. 20th century in Russia, namely in Moscow, high-tech treatment facilities for urban sewerage appear. The general and strict requirement for water disposal was the place of construction of treatment facilities and, accordingly, to the point of release of treated wastewater into the river - always below the city outside the dense population. In the era of intensive civil construction and urbanization of the Russian population, this principle of construction began to be violated: for example, Moscow covered all its wastewater treatment plants and wastewater outlets with dense housing developments. This is also practiced in other cities of Russia.

Wastewater or runoff from cities is extremely diverse in composition and sanitary and environmental hazards; they can be classified into seven groups:

From the types of wastewater considered, liquid radioactive waste was removed, which is isolated and subject to special treatment and disposal of radioactive concentrate.

Within each group, the composition and properties of wastewater are very diverse.

Wastewater Treatment Methods

Bringing wastewater to the standard indicators for the composition of pollutants is carried out at treatment facilities using various technological stages of treatment, among which are the following:

1. mechanical treatment is the primary stage of the wastewater treatment process, at which coarse pollutants (solid impurities) are removed during settling, filtration or flotation processes. Coarse particles are removed by gratings, sieves, sand traps, grease traps, oil traps, settling tanks and other engineering structures;
2. chemical treatment - various chemical reagents are added to wastewater that react with pollutants. Such reactions include oxidation and reduction; reactions leading to the formation of compounds that precipitate; reactions accompanied by gas evolution;
3. physical and chemical treatment - during these processes, finely dispersed, dissolved inorganic and organic substances are removed from the wastewater composition. This group includes such technologies as electrolysis and electrocoagulation, coagulation, flocculation, etc.;
4. biological purification is based on the ability of microorganisms to use organic pollutants as a source of nutrition, leading to complete (mineralization) or partial destruction of the structure of substances, i.e., their removal. Biological wastewater treatment can be carried out in bioponds, filtration fields, aerotanks (reservoirs with forced aeration and a high density of communities of microorganisms, protozoa, invertebrates), membrane bioreactors.

Wastewater treatment plant

In Russia, direct responsibility for the choice of treatment technology rests with the operating organizations, referred to in our country as “vodokanals”. This term is derived from two words: water supply and sewerage. Such a combination of two industries of different types of activity is uncharacteristic for the EU countries, the USA and Canada. Water supply is the production and supply of a commodity (clean drinking water); sewerage, i.e., water disposal is the provision of sanitary, hygienic and environmental services.

One of the largest wastewater treatment plants in the world are the wastewater treatment plants serving Moscow. Kuryanovskiye and Lyuberetskiye wastewater treatment facilities are capable of removing 3.125 and 3.0 million m 3 of wastewater daily, respectively. Treatment facilities of greater capacity are located only in China and a few cities in the United States.

Impact on water bodies

Each identified group of wastewater has an impact on the ecological situation in the water body - the recipient. The local consequences of polluted wastewater disposal can become an environmental and sanitary problem for large river basins and sea coasts.

For example, the metropolis of Moscow with the actual number of people living in the city at the same time, about 18-20 million people, has a decisive influence on the quality of water in the Oka-Volga basin. At present, half of the expenditure of the river. Moscow is urban wastewater, including surface runoff.

The discharge of sewage from settlements into small rivers often completely forms the composition and flow of water in the river. For example, the flow of water in the river. The desna increases from 0.92 to 1.66 m 3 /s after the discharge of wastewater from the Yuzhnobutovsky treatment facilities (OS), into the river. Pekhorka - from 1.16 to 8.40 m 3 / s after the Lyubertsy OS, in the river. Similar - from 1.85 to 2.70 m 3 / s after the Zelenograd OS.

Waste water quality

At present, for a number of reasons, the sewage treatment facilities of the municipal sewerage of the cities of the Russian Federation are not able to fully fulfill their main function - to purify wastewater, bringing it to standard indicators. In the Russian Federation in 2011, the total volume of wastewater discharges amounted to 48,095 million m 3, of which only 3.8% are legally treated and 33% (15,966 million m 3) are polluted (including 6.86% are discharged without treatment at all) . More than 60% of wastewater discharges into water bodies fall on the share of municipal sewage treatment facilities, and only 13-15% of them are classified as treated according to the norm.

Despite the tendency to reduce the volume of polluted wastewater, this does not lead to an improvement in the quality of wastewater.

The main problems of wastewater treatment in the Russian Federation

If in the largest cities the problems of water disposal are being systematically solved, then in medium, small and in most large settlements, the treatment facilities of the city sewerage are in a state of decline. The main reasons for the low efficiency of treatment facilities: lack of budgetary funds for the reconstruction and modernization of treatment facilities; non-compliance with the technological regime of their operation; non-compliance of the composition of incoming wastewater with treatment technologies; significant physical deterioration of existing treatment facilities.

G.V. Adzhienko, V.G. Adzhienko

WASTEWATER TREATMENT FACILITIES.

Wastewater treatment plants, as the name suggests, are designed to treat wastewater. Their main purpose is to treat wastewater to a level suitable for further use. Wastewater treatment methods are varied and depend on the type of wastewater, polluting factors and the level of pollution.

Purification - treatment for the purpose of destruction or removal of harmful substances from waste water. The release of wastewater from pollution is a rather complex process that can be compared with production. It contains raw materials (waste water) and finished products (purified water).

Wastewater treatment plants are installed on drains of various types.

Household drains- formed as a result of human activity. Drains come from plumbing fixtures (wash basins, sinks, toilet bowls, etc.) of residential buildings, institutions, public buildings. Domestic sewage is dangerous because it is a breeding ground for pathogenic bacteria.

Industrial waste- formed in enterprises. The category is characterized by the possible presence of various impurities, some of which significantly complicate the purification process. Industrial wastewater treatment plants are usually complex in design and have several treatment stages. The composition of such structures is selected in accordance with the composition of the effluents. Industrial wastewater can be toxic, acidic, alkaline, with mechanical impurities.

Storm drains- due to the method of formation, they are also called superficial. Effluent of this type is a liquid that collects on roofs, roads, squares during precipitation. Stormwater treatment plants usually include several stages and are capable of removing various types of impurities from the liquid, mainly mechanical and sorption treatment. Stormwater runoff is the least hazardous and least polluted of all.

Water purification systems are vital for human settlements. The consequences of dumping untreated wastewater are detrimental to nature. Dirty water that has fallen into a reservoir destroys an established ecosystem: aquatic plants, microorganisms, fish die, and soil is poisoned. The damage is done to pets and ultimately to human health.

In 2010, modern equipment was installed - filter presses. Thanks to the new units, the volume of sludge treated has increased.

Sewer treatment facilities OS, KOS, BOS.

One of the main ways to protect the natural environment from pollution is to prevent the ingress of untreated water and other harmful components into water bodies. Modern treatment facilities are a set of engineering and technical solutions for sequential filtration and disinfection of polluted effluents with a view to their reuse in production or for discharge into natural water bodies. For this, a number of methods and technologies have been developed, which will be discussed below.

More about wastewater treatment technology

Since centralized sewerage systems are not laid in all places, and some industrial enterprises require preliminary preparation of wastewater, today local sewer facilities are very often equipped. They are also in demand in private houses, suburban cottage towns and detached residential complexes, industrial enterprises, workshops.

Wastewater differs in the source of pollution: household, industrial and surface (occurring from atmospheric precipitation). Household drains are called household fecal. They consist of contaminated water removed from showers, toilets, kitchens, canteens and hospitals. The main pollutants are physiological and household waste.

Industrial effluents include water masses that were formed during:

• performance of various production and technological operations;
• washing of raw materials and finished products;
• equipment cooling.

This variety also includes water pumped out of the bowels during the extraction of minerals. Industrial waste is the main source of pollution here. They may contain toxic, potentially hazardous substances, as well as waste that can be recovered and used as secondary raw materials.

Surface (atmospheric) effluents most often contain only mineral contaminants, minimal requirements are imposed on their purification. In addition, wastewater is classified according to the concentration of various pollutants. These characteristics influence the choice of method and number of purification steps. To determine the composition of the equipment, the need for construction, as well as the capacity of various types of structures, a calculation is made of the production of wastewater treatment.

Basic cleaning steps

At the first stage, mechanical wastewater treatment is performed, the purpose of which is filtration from various insoluble impurities. For this, special self-cleaning grids and sieves are used. The retained waste, together with other sludge, is sent for further processing or taken to landfills along with municipal solid waste.

In the sand trap, fine particles of sand, slag and other similar mineral elements are deposited under the influence of gravity. In this case, the filtered composition is suitable for further use after processing. The remaining undissolved substances are reliably retained in special settling tanks and septic tanks, and fats and oil products are extracted using grease traps, oil traps and flotators. At the mechanical treatment stage, up to three quarters of mineral contaminants are removed from waste streams. This ensures the uniformity of the liquid supply to the next stages of processing.

After that, biological cleaning methods are used, performed with the help of microorganisms and protozoa. The first structure where water enters at the biological stage is special primary settling tanks, in which suspended organic matter settles. At the same time, another type of settling tanks is used, in which activated sludge is removed from the bottom. Biological treatment allows you to remove more than 90% of organic contaminants.

At the physico-chemical stage, the dissolved impurities are removed. This is done using special techniques and reagents. It uses coagulation, filtration, and settling. Along with them, various additional processing technologies are used, including: hyperfiltration, sorption, ion exchange, removal of nitrogen-containing substances and phosphates.

The last stage of treatment is chlorine disinfection of the liquid from the remaining bacterial contaminants. The diagram below shows in detail all the stages described, indicating the equipment used in each stage. It is important to note that treatment methods for various industrial enterprises differ depending on the presence of certain pollutants in wastewater.

Features and requirements for the arrangement of treatment facilities

Domestic sewage is classified as monotonous in composition, since the concentration of pollutants depends only on the volume of water consumed by residents. They contain insoluble impurities, emulsions, foams and suspensions, various colloidal particles, and other elements. Their main part is mineral and soluble substances. For the treatment of domestic wastewater, a basic set of treatment facilities is used, the principle of operation of which is described above.

In general, domestic sewers are considered simpler, since they are built to treat wastewater from one or more private houses and outbuildings. They do not require relatively high performance. For this purpose, specially designed installations are used that provide biological wastewater treatment.

Thanks to them, in suburban housing it became possible not only to equip a shower room, bathroom or toilet, but also to connect various household appliances. Typically, such installations are easy to install and operate, do not require additional components.

For industrial effluents, the composition and degree of pollution vary depending on the nature of the production, as well as options for using water to provide the technological process. In the production of food products, wastewater is characterized by high pollution with organic substances, therefore, biological treatment is considered the main method of treating such water. The best option can be called the use of an aerobic and anaerobic method or a combination of both.

In other industries, the main problem is the treatment of oil and fat-containing effluents. For such enterprises, special oil separators or grease traps are used. But the most safe for the environment are water-circulation systems for the purification of polluted water. Such local treatment complexes are installed at car washes, as well as at manufacturing enterprises. They allow you to organize a closed cycle of water use without its discharge into external water bodies.

Special systems and methods are used to determine the method of organizing cleaning and choosing a specific facility (there are many enterprises, so the process must be individualized). Equally important is the price of equipment and work on its installation. Only experts will help you choose the best option for each case.

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City wastewater treatment plant

1. Appointment.
Water treatment equipment is designed to treat urban wastewater (a mixture of domestic and industrial wastewater from public utilities) to the standards for discharge into a fishery reservoir.

2. Scope of application.
The capacity of the treatment facilities is from 2,500 to 10,000 cubic meters per day, which is equivalent to the flow of wastewater from a city (village) with a population of 12,000 to 45,000 people.

Estimated composition and concentration of pollutants in the source water:

• COD - up to 300 - 350 mg/l
• BODtotal – up to 250-300 mg/l
• Suspended solids - 200 -250 mg/l
• Nitrogen total - up to 25 mg / l
• Ammonium nitrogen - up to 15 mg / l
• Phosphates – up to 6 mg/l
• Oil products – up to 5 mg/l
• Surfactant - up to 10 mg / l

Normative cleaning quality:

• BODtotal – up to 3.0 mg/l
• Suspended solids – up to 3.0 mg/l
• Ammonium nitrogen - up to 0.39 mg / l
• Nitrite nitrogen – up to 0.02 mg/l
• Nitrate nitrogen - up to 9.1 mg / l
• Phosphates – up to 0.2 mg/l
• Oil products - up to 0.05 mg/l
• Surfactant - up to 0.1 mg / l

3. Composition of treatment facilities.

The technological scheme of wastewater treatment includes four main blocks:

• mechanical cleaning unit - to remove large debris and sand;
• complete biological treatment unit - to remove the main part of organic contaminants and nitrogen compounds;
• block of deep post-treatment and disinfection;
• precipitation processing unit.

Mechanical wastewater treatment.

To remove coarse impurities, mechanical strainers are used, which ensure the effective removal of contaminants with a size of more than 2 mm. Sand removal is carried out on sand traps.
Waste and sand removal is fully mechanized.

Biological cleaning.

Nitri-denitrifier aerotanks are used at the stage of biological treatment, which provides parallel removal of organic substances and nitrogen compounds.
Nitri-denitrification is necessary to ensure discharge standards for nitrogen compounds, in particular, its oxidized forms (nitrites and nitrates).
The principle of operation of such a scheme is based on the recirculation of a part of the sludge mixture between the aerobic and anoxic zones. In this case, the oxidation of the organic substrate, the oxidation and reduction of nitrogen compounds do not occur sequentially (as in traditional schemes), but cyclically, in small portions. As a result, the processes of nitri-denitrification proceed almost simultaneously, which makes it possible to remove nitrogen compounds without using an additional source of organic substrate.
This scheme is implemented in aerotanks with the organization of anoxic and aerobic zones and with the recirculation of the sludge mixture between them. The sludge mixture is recirculated from the aerobic zone to the denitrification zone by airlifts.
In the anoxic zone of the aeration tank of the nitri-denitrifier, mechanical (submersible mixers) mixing of the sludge mixture is provided.

Figure 1 shows a schematic diagram of the aerotank of the nitri-denitrifier, when the return of the sludge mixture from the aerobic zone to the anoxic zone is carried out under hydrostatic pressure through a gravity channel, the supply of the sludge mixture from the end of the anoxic zone to the beginning of the aerobic zone is carried out by airlifts or submersible pumps.
Initial wastewater and return sludge from secondary clarifiers are fed into the dephosphatization zone (oxygen-free), where hydrolysis of high-molecular organic contaminants and ammonification of nitrogen-containing organic compounds take place in the absence of any oxygen.

Schematic diagram of the aeration tank of a nitri-denitrifier with a dephosphating zone
I – dephosphatation zone; II - zone of denitrification; III - nitrification zone, IV - settling zone
1 - waste water;

2- return sludge;

4- airlift;

6- sludge mixture;

7- channel of circulating sludge mixture,

8 - purified water.

Further, the sludge mixture enters the anoxic zone of the aerotank, where organic contaminants are also removed and destroyed, nitrogen-containing organic contaminants are ammonified by facultative activated sludge microorganisms in the presence of bound oxygen (oxygen, nitrites and nitrates formed at the subsequent purification stage) with simultaneous denitrification. Further, the sludge mixture is sent to the aerobic zone of the aerotank, where the final oxidation of organic substances and the nitrification of ammonium nitrogen occur with the formation of nitrites and nitrates.

The processes taking place in this zone necessitate intensive aeration of treated wastewater.
Part of the sludge mixture from the aerobic zone enters the secondary settling tanks, and the other part returns to the anoxic zone of the aerotank for denitrification of oxidized forms of nitrogen.
This scheme, in contrast to traditional ones, allows, along with the effective removal of nitrogen compounds, to increase the efficiency of the removal of phosphorus compounds. Due to the optimal alternation of aerobic and anaerobic conditions during recycling, the ability of activated sludge to accumulate phosphorus compounds increases by 5-6 times. Accordingly, the efficiency of its removal with excess sludge also increases.
However, in the case of an increased content of phosphates in the source water, in order to remove phosphates to a value below 0.5-1.0 mg/l, it will be necessary to treat the purified water with an iron- or aluminum-containing (for example, aluminum oxychloride) reagent. It is most expedient to introduce the reagent before the post-treatment facilities.
Waste water clarified in the secondary settling tanks is sent for additional treatment, then for disinfection and further into the reservoir.
The principal view of the combined structure - the aerotank of the nitri-denitrifier is shown in fig. 2.

Post-treatment facilities.

BIOSORBER- installation for deep post-treatment of wastewater. More detailed description and general types of installations.
BIOSORBER– see the previous section.
The use of a biosorber makes it possible to obtain water purified to the MPC standards of a fishery reservoir.
The high quality of water purification on biosorbers makes it possible to use UV installations for disinfection of wastewater.

Sediment treatment facilities.

Given the significant volume of sediments formed in the process of wastewater treatment (up to 1200 cubic meters / day), in order to reduce their volume, it is necessary to use facilities that ensure their stabilization, compaction and mechanical dehydration.
For aerobic stabilization of precipitation, structures similar to aeration tanks with a built-in sludge thickener are used. Such a technological solution makes it possible to exclude the subsequent decay of the formed sediments, as well as to reduce their volume by about half.
A further reduction in volume occurs at the stage of mechanical dehydration, which involves preliminary thickening of the precipitates, their reagent treatment, and then dehydration in filter presses. The volume of dewatered sludge for a station with a capacity of 7000 m3/day will be approximately 5-10 m3/day.
The stabilized and dehydrated sludge is sent for storage in sludge beds. The area of ​​sludge beds in this case will be approximately 2,000 sq.m (the capacity of the treatment plant is 7,000 cubic meters per day).

4. Constructive design of treatment facilities.

Structurally, the treatment facilities for mechanical and complete biological treatment are made in the form of combined facilities based on oil tanks with a diameter of 22 and a height of 11 m, covered with a roof and equipped with ventilation, internal lighting and heating systems (heat carrier consumption is minimal, since the main volume of the facility is occupied by source water, temperature within the range not lower than 12-16 degrees).
The productivity of one such facility is 2500 cubic meters per day.
An aerobic stabilizer with a built-in sludge thickener is made in a similar way. The diameter of the aerobic stabilizer is 16 m for stations with a capacity of up to 7.5 thousand cubic meters per day and 22 m for a station with a capacity of 10 thousand cubic meters per day.
To accommodate the post-treatment stage - based on plants BIOSORBER BSD 0.6, installations for disinfection of treated effluents, a blower station, a laboratory, amenity and utility rooms, a building 18 m wide, 12 m high and long is required for a station with a capacity of 2500 cubic meters / day - 12 m, 5000 cubic meters / day - 18, 7500 - 24 and 10000 cubic meters / day - 30 m.

Specification of buildings and structures:

1. combined structures - aeration tanks nitri-denitrifiers with a diameter of 22 m - 4 pcs.;
2. industrial and amenity building 18x30 m with a post-treatment unit, a blower station, a laboratory and amenity premises;
3. combined structure aerobic stabilizer with a built-in sludge thickener with a diameter of 22 m - 1 pc.;
4. gallery 12 m wide;
5. silt pads 5 thousand sq.m.