According to the Order of the Ministry of Regional Development, Construction and Housing and Communal Services of Ukraine dated December 12, 2017 No. 316, new central rules for the acceptance of wastewater into the sewage system were approved. Based on these rules, water utilities should develop local acceptance rules that take into account local characteristics of the reception and treatment of wastewater, and also determine the class of pollutants that can be discharged into the sewage system. These requirements are more stringent than the previous ones.

That is why we offer project development and turnkey construction of innovative local treatment facilities for dairy enterprises, taking into account their specifics.

Ecodevelop is a development company and has experience in the development and construction of industrial complexes of varying complexity (biogas, biodiesel production and industrial waste treatment). Our general partner for industrial wastewater treatment is Global Water & Energy (GWE).

GWE is a solution provider for the global market for industrial wastewater treatment, water reuse and clean energy production. GWE has one of the broadest portfolio of technologies for industrial wastewater management, recycled water supply and renewable energy generation / utilization – from anaerobic wastewater treatment and conversion of organic waste into energy to a line of first-class aerobic technologies. Hundreds of plants around the world and more than 40 years of successful application experience can cope with the most difficult tasks of effluents and the conversion of organic waste into energy.

Together with GWE Ecodevelop carries out the design, technological development and maintenance of systems based on patented technologies and provides a complete turnkey service package, including construction, installation of the entire system and commissioning.

Based on our experience for the dairy industry, we offer two-stage local treatment facilities based on the FLOTAMET ™ -M anaerobic technology and the FLOTOX ™ aerobic technology. The biggest advantage of this solution is the lack of a physico-chemical preliminary purification step. This technology is practically insensitive to the presence in the drains of fats and suspended solids in a sufficiently large amount. Moreover, these substances are not removed in the form of a sludge, which must then be disposed of, but processed directly into biogas. Due to this, the biogas yield is significantly increased in comparison with standard solutions. Equally important is the fact that the resulting amount of waste from treatment facilities, namely the excess of anaerobic and aerobic activated sludge, is significantly reduced. It is also worth noting that the main advantage of FLOTOX ™ aerobic technology is the use of floating type aerators for aeration. Due to this, a significant (2-5 times) reduced energy consumption compared to the use of blowers.

Drains from milk processing plants are characterized by a high content of COD and suspended solids. Such drains are excellent for biogas production under anaerobic conditions. This allows you to make a profit in the process of wastewater treatment, producing biogas, burning in a cogenerator with the generation of electricity and heat, or using it for your own needs by replacing natural gas with biogas.

For the after-treatment of effluents from COD and hanging substances, as well as purification from nitrogen and phosphorus, aerobic technologies should be used.

It is proposed to perform local treatment facilities (VOCs) on the basis of two stages:

  • anaerobic FLOTAMET ™ -M

  • aerobic FLOTOX ™

Anaerobic stage

The FLOTAMET ™ process consists of an ANAMIX ™ mixed anaerobic reactor, followed by a sludge flotation step using SUPERFLOT ™ Biogas – BIOGAS. Flotation anaerobic sediment separation works particularly well in areas with high concentrations of suspended solids (TSS) and / or fats, oils and greases (FOG), or in high salt wastewater. It is suitable for effluents with COD values ​​of up to 100,000 mg / l and even higher and can handle individual effluent streams or a combination of several.

In the ANAMIX ™ portion of the FLOTAMET ™ Reactor, actual anaerobic treatment occurs. It is a fully mixed reactor equipped with a mixing system to prevent sedimentation and flotation of sludge. Dissolved and suspended organic matter is largely decomposed by anaerobic bacteria and converted into biogas. Since this is an anaerobic technology, a very small increase in sludge occurs during this process, which ensures the minimum amount of waste to be disposed.

The effluent from the reactor enters through a waste collection tank into a special SUPERFLOT ™ flotation chamber – BIOGAS. In the SUPERFLOT ™ – BIOGAS installation, the anaerobic biomass that leaves the anaerobic reactor with treated effluents is separated from the treated effluent by flotation and returned to the reactor. As the anaerobic biomass returns to the reactor, the sludge retention time is increased, and the total mass of microorganisms available for processing can be increased.

Therefore, the size of the anaerobic treatment system can be significantly reduced. A higher biomass concentration also gives additional process stability and resistance to peak loads or abnormal operating conditions. From time to time, excess sludge is removed and disposed of as necessary.

The principle of operation of the Dissolved Biogas Flotation Unit (DBF) SUPERFLOT ™ – BIOGAS is similar to the Dissolved Air Flotation System (DAF), but biogas is used instead of air for flotation. Compared to DAF, the DBF has a hermetically sealed, odorless separation system and ensures that there is no influence of dissolved air, as occurs when using DAF in an anaerobic process.

In this highly efficient particulate separation process, the small biogas bubbles needed for proper flotation are created by recirculating a clean DBF stream through a saturator tank in which the biogas dissolves under pressure.

After the circulation stream is injected into the SUPERFLOT ™ – BIOGAS installation, a sudden release of pressure leads to the formation of small biogas bubbles that float to the surface, entraining sediment flakes and separating the sediment from the anaerobic runoff.

Since biogas is used instead of air, the system is a completely enclosed structure that prevents odors and ensures optimal performance. Transparent roof elements are used to control the operation of the flotation unit. SUPERFLOT ™ – BIOGAS can also be supplied with a bottom auger to remove sludge in cases where a large amount of heavy solid particles accumulate in the flotation unit.

Aerobic stage

Highly efficient and capable of generating very high-quality discharges, aerobic biological wastewater treatment processes were once the solution used to treat most types of industrial effluents. Currently, with a much greater emphasis on energy efficiency and minimization of residual quantities (i.e. waste sludge), they are mainly limited to diluted industrial wastewater and municipal use, as well as as a stage of post-treatment of wastewater after anaerobic treatment. However, with strict discharge requirements, it is still not possible to develop a complete biological treatment for any type of wastewater without using at least one aerobic step.

In the processes of aerobic biological purification, organic pollution is converted into carbon dioxide and water. The process requires active aerobic biomass and the supply of a significant amount of oxygen to the reactor for processing. The disadvantage is that the supply of necessary oxygen is often very energy intensive, especially when it comes to industrial wastewater. Another disadvantage is the significant production of excess sludge, which must be controlled and ultimately disposed.

The FLOTOX ™ system consists of an aerotank and a SUPERFLOT ™ – AIR dissolved air flotation unit for sediment separation. Organic pollutants (COD, BOD) and ammonia are removed by aerobic treatment.

It is also worth noting that the main advantage of FLOTOX ™ aerobic technology is the use of floating type aerators for aeration. Due to this, a significant (2-5 times) reduced energy consumption compared to the use of blowers.

In SUPERFLOT ™ – AIR, wastewater / sludge is introduced together with a recycled clean wastewater in which air dissolves at high pressure. Floating sludge is removed by a surface scraper.

If you are interested, write to us by e-mail or call and our specialists will prepare a commercial offer for you.

Source of information: GWE

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