Water
To treat industrial water, the use of bacteria is common. The bacteria eliminates organic elements (sugars, proteins, fats…). The bacteria then degrades organic pollution in an aerated environment (aerobic tanks) or a simply agitated environment (anaerobic tanks). It is common to smooth the pollution with buffer tanks to avoid sudden load variations. However, if the production of sludge is important, dewatering can be considered as an option.
This process proposes a biology associates to ultrafiltration membranes (ceramic or organic) to ensure that bacteria and the treated water are separated. As a result, the pollution (organic materials, nitrogen, metals) largely degrades. This can be:
- Used with a fine membrane (Biological + Ultrafiltration + Nanofiltration or Reverse osmosis) -> MBR 30
- Used with granular activated carbon (Biological + Ultrafiltration + Activated carbon) -> MBR 20
- Used alone (Biological treatment + Ultrafiltration) -> MBR 10
Sludge production is reduced by the sludge’s autolysis. The availability rates are excellent. The station’s parts (bio tanks, membrane surfaces,…) are able to adapt to stick at all times to the site’s load.
The robust and reliable processing means attractive performances can be achieved. It can be used for pre-treatment or treatment when the effluent has a light load.
Physical and Chemical Treatments
Using physical and chemical techniques captures many organic or mineral compounds: metals, greases, suspended materials, emulsions…
The treatment usually happens in three steps:
- Chemical – to coagulate / flocculate / precipitate pollution
- Physical – to separate the aggregates that form (clarification, flocculation primarily)
- Dewatering the formed sludge to discharge or reclaim
- Rectangular or circular flotation cells made of stainless steel or resin (separation of light suspended materials thanks to the pressurization system)
- Lamella or classic clarifier
PHYS_CHEM_TECHSHEET.pdfThanks to our operating and design skills, we can provide improvement solutions that are adapted to suit the process. Assessment, optimisation and technical validation can be carried out on-site or in the laboratory.
It is vital to work at the correct pH for this stage to be effective. The coagulation and flocculation stages can be done in manual or automatic preparation for high consumption cases with the help of lyre or a contact tank.
Presse à vis (100kgMS/h)
This involves dewatering the sludges that have formed. The sludges are then evacuated into an external process or recovered (for use in methanation, concentration in metals, etc.).
Dewatering involves the following equipment :
- Centrifuge
- Press filter
- Screw press
This equipment can be housed in a container.
Reverse Osmosis
Ovive partners with many membrane providers which allows us to choose THE right membrane. That’s how we offer all maintenance parts for DT type modules. After all suspended materials are eliminated, the pretreated effluent goes through reverse osmosis.
To meet needs that arise every once in a while, Ovive offers mobile containerized reverse osmosis plants.
The layer collecting the permeate is ‘trapped’ between two membrane layers.
Reverse osmosis technology uses semi-permeable membranes that let water pass, but block and discharge ions and molecules. The effluent is then separated into a stream of pure water (the permeate) and a concentrated discharge (the concentrate).
After studying your ionic balance, Ovive can predict the conversion rate of a reverse osmosis facility.
Fine Screening
This process can be a treatment in itself or a step in a succession of processes.Our operating experience has led us to select systems that are versatile and easy to maintain.
Tamis courbe
Filtration from 500μm to 100μm. These filters are generally used for polishing filtration or to secure the process beforehand. They are also equipped with a self-cleaning system.
EFFLUENTS_FILTRATION_TECHSHEET.pdf
Filtre à poche
Dead-end pressure filtration using bag filters or cartridges, from 2mm to 1μm. These are easy to implement, for small quantities of matter.
Tamis rotatif à alimentation externe + compacteur de déchet
Rotary sieve filtration with an internal or external feed. These are used on heavy load effluents with filtration ranging from 2.5mm up to 250µm and are equipped with an automatic system with an integrated washer and the possibility of a waste compactor depending on the applications.
Specific Adsorbents
Activated carbon is a very porous material that can secure pollution by adsorption on its largest contact surface.
Activated carbon adsorption captures:
- Metals
- COD
- AOX
ACTIVATED_CARBON_TREATMENT_TECHSHEET.pdf
The Ovive ASP is capable of retaining the :
- Phosphorus (in the form of orthophosphate)
- Arsenic
It is often used in the finishing treatment, generally to achieve the standard.
The advantages of adsorbents :
- Pollution is removed from the site by means of a physical medium
- Quick implementation
- Compact plants
- Modularity
