to success
since 1997

Distributor / authorized representative that deals with supply & delivery of granular filters to industrial enterprises of Russia

Engineering company ‘Intech GmbH’ LLC (ООО «Интех ГмбХ»), Russia, has been successfully working with a number of Russian industrial enterprises at the local market for more than 20 years. Since the company’s founding, it has acquired immense engineering experience, market reputation, and has realized more than a hundred large-scale projects at the industrial plants in Russia. Our company is continuously in search of new business partners, who consider Russian market investment-attractive and want to boost their sales in the region, as well as expand their field of activities and enter a new international level.

We are interested in cooperation with the manufacturers of granular filters, who are looking for an official and reliable distributor to deal with supply & delivery of their equipment to the industrial plants in Russia.

The company’s top management and sales team are well acquainted with the Russian market, its mentality and laws; they also understand industrial specifics of the financial and economic activities of the Russian customers. All our sales managers have a large customer database, extensive experience of successful sales and well-established connections with the potential buyers of your granular filters. This allows our managers to promptly set out the most promising directions for promotion and to ensure a rapid entry of the products into the promising Russian market. Our employees, who are fluent in English and German, are focused on working at the international market with the supplies of foreign equipment.

Our team of experienced engineers, who can handle the most serious technical problems, constantly keeps in touch with the Russian customers, holds meetings and delivers presentations regarding the latest achievements of our manufacturing partners. They point out the engineering challenges and actively communicate with all the departments at Russian plants. That is why the specifics of doing a business in the Russian Federation are well-known to us, and we also know the equipment of the local industrial plants and their up-to-date modernization needs.

Once we become your authorized representative in Russia, our marketing staff will carry out a market research in order to check the demand for granular filters, will submit a market overview for granular filters that you offer and evaluate the needs for this type of equipment at local plants. Our specialists will also estimate the potential and capacity of this market at local industrial plants. Our IT-team will start developing a website for your products in Russian. Our experts will assess the conformity between your granular filters and customer needs as well as analyze the common reaction to the new goods in general. We will look into the categories of potential customers, and pick out the largest and the most promising plants.

Upon becoming your authorized agent on the territory of Russia, ‘Intech GmbH’ LLC (ООО «Интех ГмбХ»), will obtain certificates, if required, for a batch of the goods, for various types of granular filters in compliance with Russian standards. We can also arrange the inspection in order to obtain TR TS 010 and TR TS 012 Certificates. These certificates provides permission to operate your equipment at all industrial plants of the EAEU countries (Russia, Kazakhstan, Belarus, Armenia, Kyrgyzstan), including the hazardous industrial facilities. Our company is eager to assist in issuing Technical Passports for granular filters as per Russian and other EAEU countries’ requirements.

Our engineering company ‘Intech GmbH’ LLC (ООО «Интех ГмбХ»), collaborates with several Russian design institutes in various industrial segments, which allows us to conduct preliminary design as well as subsequent design works according to the standards, construction rules and regulations that are applicable in Russia and other CIS countries. It also enables us to include your granular filters into the future projects.

The Company has its own logistics department that can provide packing service, handling as well as the most efficient and cost effective mode of transportation of the goods (incl. over dimensional and overweight goods). The goods can be delivered on DAP or DDP-customer’s warehouse basis in full compliance with all the relevant regulations and requirements that are applicable on the Russian market.

Our company has its own certified specialists who will carry out installation supervision and commissioning of the delivered equipment, as well as further guarantee and post-guarantee maintenance of granular filters. They will also provide necessary training and guidance for the customer’s personnel.

Granular filters. A brief overwiew

Granular filters are used for wastewater treatment after the water has been settled. There are two types of granular media filters:

  • pressure filters;
  • gravity filters.

Pressure granular filters are used for wastewater treatment. Wastewater does not come in contact with the atmosphere, which prevents corrosion and oxidation. Gravity granular filters are used for treatment at machine-building plants and refineries.

As a filter medium, natural and man-made materials can be used as a part of these filters. Natural filter materials include sand, gravel, anthracite coal, expanded clay, etc. Man-made filter materials include polystyrene, nitron, lavsan, etc. Natural materials are used in a crushed form, while man-made ones are used in crushed or fibrous forms.

Pressure granular filters are subdivided into vertical and horizontal filters. Generally, such filters are made as a reservoir designed to operate at a pressure of 0.6 MPa. Filters are placed horizontally in order to expand filtration surface. Filtration takes place in the downward direction; filtration rate is 4 to 17 m/h. Filtration time depends on the quality of wastewater and varies from 8 to 40 hours.

Drawing of vertical pressure-type filter with granular layer

Stages of granular filter’s operation cycle:

1. supply of water for clarification; 2. discharge of washing water; 3. outlet for clarified water; 4. outlet of the first filtrate; 5. supply of compressed air; 6. supply of washing water; 7. circular manhole; 8. elliptical manhole; 9. top distribution device; 10. filter layer; 11. connecting tube designed for hydraulic charging/discharging of filter.

The efficacy of filtration is increased by adding Al2(SO4)3, a coagulating agent, and a polyacrylamide flocculating agent into water. Filters are cleaned through a drainage system in the upward direction. Washing rate is 10 to 12 l/(s·m2), provided that the size of sand particles is 0.7-0.8 mm.

Pressure-type filters performance is given in the table below.

Charge material Grain size for charge, mm Inhomogeneity coefficient (maximum) Filtration rate, m/h Washing rate, l/s·m²
water air
Quartz sand 0.8-1.8 1.8 11 7 16
1.5-2.5 2 14 7 21
Anthrafilt 0.8-1.8 1.8 11 7 14
1.5-2.5 2 14 7 18
Note: supporting gravel layers are absent.

The filtration area of pressure granular filters is determined from the formula:

F = Q / (m·υp - 3,6·n·W·t1 - n·t2·υp)

Q is average daily capacity of a plant, m3/day; m is running time of a plant, h; υp is rated speed of a filtration, m/h; n is a number of washings performed by each single filter at a normal working mode within 24 hours; W is washing rate, l/(s·m2); t1 is washing time, h; t2 is filter idle time during washing, h (take as 0.33 h).

Filters with granular or loose filter membrane

A vessel, equipped with a lattice-like bottom, is the simplest filter. A cake layer, formed on the bottom, is used as a filter medium in such a filter. The pressure is created by the pressure in a hydrostatic liquid column during filtration.

This type of filters is something between a filter and a settling tank, since such filters can better remove liquid from residues, than settling tanks. However, despite this fact, it is impossible to remove all the liquid because a certain amount of liquid is always retained on the surface and in the pores of solid particles. Moreover, a certain amount of liquid is also left due to the effect of capillary forces between the solid particles.

The value of capillary forces in the granular filter membranes can be defined using the data of the following table:

Height of capillary water rise
Granular filter membrane Height of water rise at 150
Clay up to 2 m
Sand (middle grain size) 40 cm
Sand (large grain size) 0 cm

The surface adhesion depends on the viscosity, which, in its turn, depends on the temperature. The liquid viscosity falls as the temperature rises, whereby it makes sense to perform filtration at an elevated temperature to achieve a better liquid runoff.

In case when it is undesirable to keep the filtrate, which is held between the particles, in the residue, the filtrate can be removed by washing the residue with washing liquid. The washing liquid is supplied in the same direction as the filtered suspension. It is important for the washing layer to have no breaks or cracks, due to which washing liquid cannot uniformly wash the residue to a good quality.

The grain size of a filter membrane depends on the size of solid particles to be separated. That is, the thinner the solids to be separated, the finer the grain of the filter membrane should be. Coal, slag, quartz sand, crushed marble, coke, asbestos, and ore can be used as a granular filter membrane.

When choosing a granular material, it is necessary to take the form of suspensions to be filtered into account. Salt solutions and almost all acids are filtered using fine quartz sand because it is almost insoluble in the filtered medium and does not form a chemical bond with it. Crushed marble or straight limestone is typically used as a filter membrane if filtration of alkaline liquid is required.

Coarse-ground charcoal is the best medium for filtration of liquids that contain resins. The cleaning of liquids from resins is also determined by the phenomenon of adsorption.

When the filter operates, the granular layer becomes contaminated. As a result, the capacity is reduced. To clean it, water is run through the granular filter in the upward direction. In some cases, the filter is not only washed, but it is also purged with air or mixed with special mechanical agitators.

Sand filters, which are typically used for water treatment, are the most popular granular filters. Such filters are made as vessels with several layers of quartz sand or gravel. Sand filters can be pressure filters, which means they can operate under a certain pressure (about 1.5-2 kgf/cm2), created by a conventional pump, or open filters that operate under the pressure of the hydraulic liquid column, the height of which is 1-1.5 m.

A pressure sand filter is composed of a vertical vessel filled with sand. This vessel contains a manifold, from which tubes with openings are branched in two directions. There is a device design for washing of sand layer, which is located in the lower part of the conical bottom of the vessel. At that, the sand, located at the bottom of the unit, is transported by a water jet through the pipe in the upwards direction; at the same time, the sand is being washed. The washing water is removed through the pipeline afterwards. The liquid incoming for filtration is supplied under a certain pressure, and it passes through the sand layer. Then, that liquid is collected through the pipeline and manifold, and is removed from the manifold through the pipeline.

Granular gas filters

Granular filters of this type can operate at elevated (up to 400 degrees Celsius) temperatures, and, in cases of using special steel, they can operate at high (up to 700°C) temperatures as well. Therefore, they are often used for high temperature gases treatment.

To remove dust from gas, the gas passes through a filling layer of granules. The granules height is 100 mm, and their size ranges from 2 to 5 millimeters. The filter layer is cleaned by mechanical stirring in combination with backblowing. During backblowing, dusty air passes through cyclone separator and is mixed with raw gas.

Granular filters are widely used in high-temperature gases treatment, they separate sticking abrasive and high-resistance dust. They are used when using bag filters and electrostatic precipitators is unreasonable.

There are two main types of granular filters: 1) bulk filters; 2) rigid porous filters.

A filter layer of granular bulk filters is composed of granules of spherical shape (sand, expanded clay, gravel, crushed rock, sawdust, etc.), depending on the requirements posed by a process. Grains, the size of which is from 0.2 to 2.0 millimeters, must form together a filter layer w height of up to 10-15 centimeters.

Granular filters have a number of significant advantages. They have a simple and easy design; they can treat high-temperature gases, as well as clean air that contains various corrosive media and a relatively high concentration of dust. In addition, except for filtration, filter granules can perform a number of other functions, for example, they can act as a sorbent, heat carrier or catalyst.

Depending on types of collected dust and mode of operation, granular filters can provide for the degree of gas treatment from 95 to 99% at a filtration rate of 10 to 40 meters per minute. At that, their flow resistance is from 1300 to 3000 Pascals.

Rigid porous filters are usually made of ceramics or cermet. Although they have a significant advantage, as they are highly resistant to high temperatures (up to 1300 degrees), yet these filters are very expensive, rather badly exposed to regeneration and, on top of that, they have a very high flow resistance.


Upon becoming the official distributer of fabric filters, our company ‘Intech GmbH’ LLC (ООО «Интех ГмбХ»), carries out the following: finds the buyers of your products on the market, conducts technical and commercial negotiations with the customers regarding the supplies of your equipment, concludes contracts. Should a bidding take place, we will collect and prepare all the documents required for the participation, conclude all the necessary contracts for the supply of your equipment, as well as register the goods (fabric filters) and conduct customs clearance procedures. We will also register a certificate of transaction (Passport of Deal) required for all foreign trade contracts in the foreign currency control department of the authorized Russian bank so that currency transaction could be effected. If required, our company will implement an equipment spacing project in order to integrate your equipment into the existing or newly built production plant.

We are convinced that our company ‘Intech GmbH’ LLC (ООО «Интех ГмбХ»), will become your reliable, qualified and efficient partner & distributor in Russia.

We are always open for cooperation, so let’s move forward together!