Currently, our communal economy is experiencing certain difficulties. Communication fell into decay, the quality of purification of industrial and domestic wastewater deteriorates. Therefore, it is often often necessary to reconstruct and modernize the sewage facilities and business communications based on new technologies.

During the reconstruction of existing wastewater treatment plants, the main condition is the optimization of capital costs, achieving the effective work of all technological sites and reduced operation costs. One way to improve the efficiency of enterprises is the use of energy-saving technologies and high-quality equipment.

It is no secret that the main operational costs of sewage treatment plants are the cost of electricity, the lion's share of which is aeration costs.

To achieve maximum efficiency and reduce electricity costs associated with aeration processes, it is necessary to competently approach the choice.

Due to the fact that the wastewater treatment structures do unevenly need to reduce or increase air supply for aeration, depending on the concentration of oxygen dissolved in it. To minimize the cost of electricity required for work blowers for sewage treatment facilities It is necessary to regulate the performance of blowing units, depending on the need for oxygen. The blowing station should have a fairly wide range of regulation and submit to the system the required amount of air with minimal electricity costs, thereby saving not small means for paying expensive electricity. This can be achieved by competent selection blower Kaeser. .

A number of sewage treatment plants have averaging basins that provide uniform wastewater supply for subsequent purification, and it would seem, in this case there is no need to regulate air supply to aeration, but there are many other factors that affect the supply of the required amount of air. The main factor affecting the change in air supply is the temperature.

The density of the air and the concentration of dissolved oxygen in it substantially depend on temperature. Accounting for this, namely, setting up the change in the supply of air to aeration by ambient temperature is a powerful potential for saving electricity.

Literate selection blowers for sewage treatment facilities it is the key to future enterprise economy, highly efficient production due to a significant reduction in operating costs. The blowing station configuration directly depends on the operating conditions. When selecting blowers for sewage treatment facilities it is necessary to take into account all: air humidity, height above sea level at the place of installation of the blower, the temperature of the surrounding and suction air, pressure loss in the air network.

To take into account all these factors and correctly pick up the blower helps special software.

Blowers for water treatment facilities Kaeser they have a different design that allows you to install them close to each other (maintenance is carried out from the front side of the unit), thanks to this aggregates, there is a significantly less area for installation.

Moreover blowers for wastewater treatment plants it can be made performed for exploitation outside the room and placed directly on the street, near the aerotank. Thus, there is no need to build or reconstruct the premises for the placement of the blower station, as well as the subsequent costs associated with the operation of the room.

Installation blowers for aeration on the street Directly near the aerotank allows you to avoid costs not only for the construction of premises for the placement of aggregates, but also significantly reduces the length of the pneumatic train. In this case blowers for aeration Work even more efficiently, since there are practically no pressure losses on the highway and less drive power is required to supply the required amount of air.

Applying a systematic approach to the selection blowers for sewage treatment facilities , given all factors affecting the process of air supply, you can achieve the desired result, significantly reduce operating costs and increase the energy efficiency of the object.

Blowers for sewage treatment plants are used for two technological processes:

• For aeration. The aeration process is a forced saturation of wastewater by air to stimulate the reproduction of aerobic bacteria. These beneficial bacteria decompose biomass contained in water, on methane and carbon dioxide. Such a process occurs on all major structures in Russia. Depending on the volume of incoming stocks, aeration intensity is changing the performance of blower performance.
• The removal of biogas formed as a result of decomposition by bacteria organic substances contained in wastewater. The biogas consisting of methane and carbon dioxide is pumped up with a cistern blower and is delivered to the consumer.

To solve the tasks of Zebrikon JSC offers two types of blowers for sewage treatment plants: rotary and screw. With their help, you can solve all the tasks set in the shortest possible time. Employees of our company may choose blowers for sewage treatment plants directly to the technical task of customers.

Specifications

Modular execution

In some cases, when the customers have a separate room for installing blowers, our company proposes to solve this task by mounting equipment in block containers. In this case, you get an autonomously working compressor station for the production of low pressure compressed air completely ready-to-use. All systems are mounted inside the container. To start the station, you only need to bring electricity and display the air supply network to the shared collector.

How to order equipment

If you need a blower for sewage treatment facilities, and you are ready to buy it, our company has the opportunity to put it on you on favorable terms. Zemanikon JSC is a supplier of this equipment in the territory of the Russian Federation. Employees of our company will correctly select you the desired equipment that will fully comply with your technical assignment. In addition, we are ready to carry out installation, commissioning work and successfully launch the equipment into operation in the customer's territory. Under an additional agreement, our service engineers will spend after-sales service of compressors during the entire operation of the equipment.

Air Bowers for aeration in WasteWater Treatment

Keywords:bioLogical Treatment, Air Bowers, Aeration

Biological Treatment Today Is One of the Most Environment-Friendly Methods of Treatment of Industrial and Municipal Wastewater. Saturation of the Treated Water with Oxygen Is a Mandatory Condition for An Efficient Aerobic BioLogical Treatment Process. This is Achieved with Air Bowers Designed for Compression and Delivery of Vacuum.

Description:

Blowers for aeration when cleaning wastewater

Biological cleaning is currently one of the most eco-friendly water treatment methods of both industrial and household wastewater. For the effective flow of the process of aerobic biological purification, the saturation of oxygen purified by oxygen is a prerequisite. This uses blowers intended for compression and air injection, as well as to create a vacuum.

When choosing equipment for wastewater treatment facilities, blowers pay special attention. Air flow rate required for wastewater treatment depends on the need of the process in oxygen, the necessary efficiency of removal of pollutants, as well as from the cleaning technology used. The required amount of air supplied during purification in aerotanes depends on the composition and temperature of wastewater, the geometric characteristics of aerotanes, such as aerators used.

The estimated working pressure to create blowers should be taken on the basis of the depths of the aerators in the aerotanks and the pressure loss in the aircase network and the aerators themselves.

The range of the required blower performance, depending on the specified conditions, can differ significantly and range from several cubic meters of air to tens of thousands. At the same time, regardless of the size, blowers used for wastewater aeration must comply with the following requirements.

1. Aeration is one of the most energy-processes. Up to 70% of energy on wastewater treatment facilities is consumed by aeration systems. Accordingly, one of the most important requirements is the high energy efficiency of used blowers. According to the requirements of regulatory documents, it is necessary to consider the possibility of disposal of compressed air heat for the needs of the wastewater treatment station. It is recommended to use blower equipment that allows you to regulate the flow of the air supplied. This is due to the daily and seasonal unevenness of the flow of wastewater, as well as changes in both the temperature of wastewater and the air temperature coming to the blowers. When using biological removal technologies, nitrogen and phosphorus it is recommended to provide a flexible or step control of the air supply system in aerotanks using automation tools.

2. Blowers must have a minimal impact on environmental environment. Class of compressed air cleanliness is regulated according to GOST R ISO 8573-1-2016 "Compressed air. Part 1. Pollution and purity classes ", which is identical to the international standard ISO 8573-1: 2010 *" Compressed air. Part 1. Pollution and cleanliness classes "(ISO 8573-1: 2010). Currently, we are recommended for use of oil-free blowers. The absence of oil has a beneficial effect on maintaining the vital activity of bacteria and microorganisms in the processing of sewage precipitate, the air of which does not contain particles of oil. Especially unacceptably the air content in the event that water after cleaning must be reused.

3. The blower should work as silent as possible, since the increased level of noise negatively affects the personnel involved in the operation of equipment of wastewater treatment facilities.

4. The blower must be calculated for operating conditions, that is, to be resistant to corrosion, temperature drops and the effects of atmospheric precipitation.

5. Blowers should be different in operation.

Yu.V. Gneexes (General Director of Vistaros LLC)

The fact that from 60 to 75 percent of the energy consumption of sewage treatment facilities (KOS) of cities and large industrial enterprises is coming to supply air to the aeration system. This article discusses issues of possible energy consumption saving in the aeration system through the use of energy-efficient system elements.

Energy savings reserves in the aeration system are huge, they can be 70% or more. Consider the main elements of this system that significantly affect energy consumption. If you drop issues such as the need to maintain in good working condition of air supply pipelines, etc., then these include:

1. The presence of primary septic tanks on the KPS, which make it possible to reduce the biological need for oxygen (BOD) and the chemical need for oxygen (CCD) of the effluent on the entrance of aerotanks. As a rule, primary sumps are already present on most major braids.
2. The introduction of a denitrification nitrification process that allows you to increase the amount of dissolved oxygen in the return active ILE. This process is increasingly implemented in the construction and reconstruction of the COP.
3. Timely service and replacement of aerators.
4. The use of controlled optimal power blowers, the introduction of a unified control system for all blowers.
5. The use of specialized control valves in the air distribution system by aerotanes.
6. Introduction of the control system of each valve and all valves according to data from dissolved oxygen sensors installed in aeration pools.
7. The use of air flow meters to stabilize the air distribution process and optimizing the setpoint at the minimum level of dissolved oxygen for the valve management system.
8. Introduction to an additional feedback control system for ammonium sensor at the output of aerotanes (applied in certain cases).

The first two points (primary sumps and the introduction of nitrification-denitrification) are to a greater extent to the issues of capital construction on the COP and in this article are not detailed. The following are issues of the introduction of modern high-tech modules and systems that allow to achieve a significant reduction in electricity consumption on the COP. These modules and systems can be embedded both in parallel with the decision of the first two items and independently of them.

The main consumer of electricity in the air supply system for aeration is blowers. Their correct choice is the basis of energy saving. Without this, all other elements of the system will not give the desired effect. Nevertheless, we will start not with blowers, and we will follow the order in which you need to select all modules.

Aerators

One of the main characteristics of aerators is the specific effectiveness of dissolving oxygen, measured as a percentage per meter of the depth of the aerators. For modern new aerators, this value is 6% and even 9%, for old aerators it can be 2% and lower. The design of the aerators and the applied materials determine the life of their operation without loss of efficiency, which for modern systems is from 6 to 10 years and more. The choice of design, the number and arrangement of the aerators is carried out according to such parameters as BODs and ICPs of the input in the system of aeration, in terms of the volume of incoming effluents per unit of time and by the construction of aerotenkov. If we are dealing with the reconstruction of the brain with very old aerators in poor condition, then, in some cases, only the replacement of the aerators and the installation of relevant blower aerators will reduce energy consumption by 60-70%!

Blowers

As mentioned above, the blowers are the main element that saves electricity consumed. All other elements allow you to reduce the need for air supply or reduce airflow resistance. But if at the same time leave the old unmanaged blower with low efficiency - there will be no savings. If there are several unmanaged blowers at aeration, then theoretically, optimizing other elements of the system and achieve a reduction in the need for air supply, can be derived from operation and translate several blowers from among those previously involved and, thus achieve reduction in energy consumption. You can also try to compensate for the daily fluctuations in the needs of the aeration system in oxygen by simply on or disconnecting the backup blower.

However, the use of a controlled blower is much more efficient to use a block of several controlled compressors. This makes it possible to provide air supply in accurately compliance with the need that changes significantly during the day, and also changes depending on the season and other factors. The usual constant air supply by unmanaged blowers is always redundant and leads to overvoltage of electricity, and in some cases to violation of the technological process of nitrification-denitrification due to excess oxygen in the aerotanks. At the same time, the lack of supplying air leads to exceeding pollutants in stock at the outlet of the oscillation of the maximum permissible concentrations (MPC), which is unacceptable.

Accurate control of air supply in constant control of the dissolved oxygen level in aerotanks (and in some cases - and with constant automatic control of ammonium concentrations and other pollutants in stock at the outlet of the aerotanes) provides an optimal level of power consumption with a guaranteed compliance of purified stocks with existing standards.

The need to prevent multiple blowers in the block (for example, two large and two small) is related to the fact that the aircraft regulation range is strongly limited. It is within, at best, from 35% to 100% power, more often from 45% to 100%. Therefore, one controlled blower can not always provide an optimal air supply, taking into account the daily and seasonal needs of the need. Today, three types of blowers are the most famous: rotary, screw and turbo.

The choice of the desired blower type is made mainly according to the following parameters:

- the maximum and nominal need for air supply - depends on the parameters of installed aerators, which in turn are chosen on the basis of their effectiveness and from the need of the entire aeration system in dissolved oxygen, as described above;

- The required maximum excessive pressure at the blower outlet is determined by the maximum possible depth of the aeration pool of aeration, or rather the depth of the arrangement of aerators, as well as pressure losses when passing air through the pipeline and through all elements of the system, such as valves and so on.

As a rule, each controlled blower has its own control unit, it is also important to have a common control unit by all blowers, providing optimal mode of operation. Management in most cases is carried out by pressure at the output of the blower unit.

Controlled air valves

If in the system one blower (or blower block) delivers air to only one aeration pool, then you can work without air valves. But, as a rule, at aeration stations, the blower unit will deliver air for several aerotanes. In this case, air valves are needed at the entrance to each aerotenk to regulate the distribution of the air flow. Additionally, the valves can be used on pipes that distribute air supply to different zones of one aerotane. Previously, swivel dampers managed by manually used for these purposes. However, remotely controlled valves must be used to effectively manage auction.

An important characteristics of the controlled valves include:

1. Linence control characteristics, i.e. The degree of compliance with the change in the valve drive position (actuator) by changing the air flow through the valve in the entire control range.
2. Error and repeatability of testing by actuator with a set airflow setpoint. Determined by the quality of the valve (linearity of the control characteristics), drive and drive control system.
3. Fall pressure on the valve in the operating range of disclosure.

The pressure drop on the swivel dampers during partial opening can be very significant and reach 160-190 mbar, which leads to large additional energy consumption.

If even the highest quality, but universal valves are used in the system (designed for both water and air), the drop in the pressure on such valves in the operating disclosure range (40-70%) is usually 60-90 mbar. Simple replacement of such a valve on a specialized Vacomass Elliptic air valve will result in additional economy than 10% of electricity! This is due to the fact that the pressure drop on Vacomass Elliptic in the entire operating range does not exceed 10-12 mbar. An even greater effect can be achieved when using Vacomass JET valves for which the pressure drop in the operating range does not exceed 5-6 mbar.

Managed Specialized Air Valves

Vacomass. FirmsBinder Gmbh., Germany.

Often, in the place of installation of the controlled valve, the pipeline is made to apply the optimal size valve. Since the narrowing and expansion is performed in the form of a pipe of Venturi, this does not lead to an essential additional pressure drop on the area with the valve. At the same time, the smaller diameter valve operates in the optimal opening range, which ensures the control lineability and minimization of the pressure drop on the valve itself.

Dissolved oxygen sensors and valve control system

BA1 - aeration pool 1; Ba2 - aeration pool 2;

PLC software and logical controller;

BV - Block Blower;

F - air flow meter; P - pressure sensor;

O2 - Dissolved Oxygen Sensor

M - Drive (actuator) air valve

SOZ - Prize control system (valve)

SUV - blower management system

The figure shows the most common control circuit of the air supply process for several aeration pools. The quality of flow cleaning in aerotanks is determined by the presence of the desired amount of dissolved oxygen. Therefore, for the main controlled value, as a rule, the concentration of dissolved oxygen [mg / liter] is taken. One or more dissolved oxygen sensors are installed in each aerotane. The control system sets the setpoint (set by the average value) of the oxygen concentration, with such a calculation so that the minimum actual oxygen concentration is guaranteed to ensure the low concentration of harmful substances (for example, ammonium) in the exit of the aeration system - within the MPC. If the incoming volume of effluents in a particular aerotenk decreases (either its BOD and COD decreases), then the need for oxygen is reduced. Accordingly, the amount of dissolved oxygen in the aerotank becomes higher than the setpoint and, by signal from the oxygen sensor, the valve control system (SUS) reduces the disclosure of the corresponding air valve, which leads to a decrease in air supply to the aerotane. At the same time, it leads to an increase in pressure P at the output of the blower unit. The signal from the pressure sensor enters the blower management system (suv), which reduces the air supply. As a result, the power consumption of blowers is reduced.

It should be noted that to solve the problem of energy saving, a well-thought-out optimal setting of a given minimum concentration of dissolved oxygen in the SOZ is very important.

An equally important and reasonable setting of a given pressure p at the outlet of the blower block is not important.

Air flow meters

The main task of air flow meters in aeration system from the point of view of energy saving is to stabilize the air supply process, which makes it possible to lower the concentration of dissolved oxygen for the control system.

The air supply system from the blower unit into several aerotanes is quite complicated, in terms of management. In it, as in any pneumatic system, there are mutual influence and delay when working out control effects and signals from feedback sensors. Therefore, the actual concentration of dissolved oxygen constantly fluctuates near the specified value (setpoint). The presence of air flow meters and the general management system of all valves allows to significantly reduce the system reaction time and reduce oscillations. What, in turn, makes it possible to lower the setpoint, without concern to exceed the ammonium MPC and other harmful substances in stocks at the yield. From the experience of the company Binder GmbH, Introduction to the data management system from flow meters allows you to obtain additional energy savings about 10%.

In addition, if the process of the phased reconstruction of the aeration system is underway, in which the aerators, valves, valve control system and air flow meters, while maintaining the old blower, and then go to the selection of new controlled blowers, the actual air flow data will help produce the optimal The choice of blowers, which leads to substantial savings when purchasing and exploiting them.

A distinctive feature of Vacomass flow meters of the company Binder GmbH is their ability to work on short direct areas "to" and "after" due to special technological solutions, as well as installed directly in the Vacomass valve block.

Ammonium sensor

The ammonium concentration sensor can be installed in the channel at the output of the wastewater from the aerotane system to control the quality of cleaning. In addition, the introduction of indications from ammonium sensor into the control system allows you to further stabilize the system and obtain additional energy savings due to further decrease in the concentration setting of dissolved oxygen.

An example of the organization of the air supply control system in aerotanks with feedback on the dissolved oxygen sensor (DO) and ammonium (NH4).

The aeration of wastewater is the saturation of the liquid with oxygen, giving life to bacteria that processes toxins, organic substances, forming il. Bubble streams are created by diffusers installed at the bottom of the water reservoir.

Large volumes of compressed air are required with continuous operation of the equipment, to provide which can - blowers for aeration.

equipment requirements

Compressors for treatment facilities are selected based on the following conditions:

1. The first thing to pay attention to choosing a compressor is the depth of the reservoir. Every 10 M of the fluid column creates a pressure of 1 bar. Accordingly, the blower for sewage treatment plants should create a working pressure sufficient to pump air to the bottom level. As a rule, the depth of treatment facilities does not exceed 7 meters (0.7 bar - 70 kPa), thus, for aeration, most of the centrifugal models and VRMT blowers manufactured by LLC "Thermomechanics" are suitable for auction.
2. Productivity, which is calculated based on the size of the reservoir, the number and characteristics of diffusers. The volume of the required air can be from 100 to 50 thousand cubes per hour.
3. "purity". The air should not contain impurities of lubricating cooling fluids, which will adversely affect the vital activity of bacteria.
4. Easy and reliability. The low pressure compressor has to work in nonstop. For water aeration, suitable machines with direct drive from the engine shaft, without gearboxes and clinorem. The centrifugal blowers of the tremomechanics plant, have a resource more than 100 thousand hours of continuous operation.
5. Low noise. Magnificent wastewater treatment plants, serving villages of private households, commercial enterprises receive increasingly distribution. Proximity to housing, eliminates the use of equipment exceeding sanitary standards for noise levels. The acoustic indicators of the vortex and centrifugal superchargers of the thermomechanics are in the range of 50-75DB, which fully meets the requirements of SanPiN.
6. Efficiency. Power consumption directly depends on the efficiency and power of the supercharger engine. Rotary blowers for aeration have a higher efficiency, however, "voracious" vortex, possess the advantage of noise, reliability and purity of the injected air

In order to not overpay for electricity, you need an accurate calculation of a sufficient amount of air per unit time, knowing which, the blower is selected of a certain performance.

The use of automatic control systems also allows you to reduce the engine time, and accordingly, accounts for electricity.

How to choose

To buy the optimal type and model of the blower, minimize the costs of wastewater aeration, call the thermomechanics plant sales department, or order a call back at a convenient time.

The service engineer will perform preliminary air flow calculations, will offer the equipment most suitable for a specific situation.

Product prices are voiced at the request of the client, after coordinating the blower model, or the technical task for designing the installation.