The dairy industry is dedicated to the production of milk and processing of by-products such as yoghurts, cheeses, butter, cream … This sector generates a large quantity of process water highly contaminated with organic matter, as well as nitrogen and phosphorus, detergents, acid, oils and greases.
The range of water treatment solutions Salher enables endless options which adapt to any quality and innovation challenge.
Origin of discharge from the dairy industry and its by-products
Wastewater is generated through:
- The manufacturing process.
- Cleaning of tanks, equipment and installations, surfaces (floors, walls), leaks and spills.
- Periodic drainage operations. These operations represent the largest part of water consumption in order to guarantee the required hygiene and quality conditions.
- Sanitary uses.
There are several treatment options depending on the defined strategy, the type of project (wastewater removal, reuse) and the discharge of treated water.
Treatments for dairy sewage
1. Pumping solutions upstream from the plant.
According to the flow, the pumping station could be prefabricated or a civil engineering structure. Salher tanks are manufactured in GFRP according to the Filament Winding method and have the following advantages:
- Complete waterproofness and corrosion resistance,
- High isothermal resistance to changes in temperature,
- High chemical and mechanical resistance enables underground installation in many circumstances (deepness, water-table, etc),
- Light equipment,
- Long-term durability,
- Flexibility which enables multiple shapes and designs in accordance with the requirements of the project or works.
The installation of a screening system for coarse, fine and non-putrescible solids is necessary. Salher recommends a rotary drum sieve with automatic cleaning and an opening size lower than 3mm, such as the Salher brand TA-RO.
3. Advanced primary treatments.
- Equalization tanks, to dampen the speaks of the flow and to control the pH.
- Dissolved Air Flotation, a physicochemical treatment to separate the greases by flotation using a micro bubbles diffusion.
The yields of this process could improve with the addition of coagulants and flocculants, prepared in the UAP (polyelectrolyte preparation plant).
4. Conventional biological secondary treatments.
- Activated sludge treatment (aerobics) with nitrification-denitrification and clarification process.
- Treatment through moving bed or MBBR system (aerobics). Compact technology with lower energy consumption than activated sludge treatment; stable for the BOD / COD and nitrogen removal. The addition of iron salts (iron chloride) is necessary in order to chemically remove the phosphorus.
5. Sludge conditioning.
Once the water has been purified for discharge, we recommend to reduce the maximum volume of sludge. There are several possibilities:
This process eliminates odors through ionization systems and active carbon.
Compact container solution
The containerized solutions of Salher will be customized to meet the requirements of all the customer and the environment in which the WWTP will be installed.
Compact and containerized Salher WWTP can treat a flow of 150 m³/day, equivalent to the level of contamination generated by a city of 82,000 inhabitants.
One of the main advantages is the reduced space in which the different treatment and control equipment are housed to enable comfortable use and supervision by the technical staff.
The 40-foot container is thermally insulated and perfectly adapted to the climate of the site.
Its transport and installation are fast and easy.
- Studies and evaluations,
- Civil engineering,
- Water engineering,
- Commissioning, assistance and in situ technical support,
- Electronics, instrumentation, automation and remote control of the plants,
- Technical support for operation and control,
- Multilingual documentation.
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Engineering – Wastewater treatment – Purification – Liquid/solids separation equipment for industrial and municipal process applications – Surface water – Groundwater – Water Reuse – Drinking Water – Hydrocarbon and Oil Water Separation