Recycling of Dry Cleaning Baths in Compact Physico-Chemical Line
Recycling of the detergent degreasing baths of a metallurgical workshop via a compact physico-chemical line, with buffer tank, coagulation-flocculation and lamella clarifier, to reduce waste and recover oils.
Project information
- Nantiat (Metallurgical industry)
- 2024
- Keywords
- Buffer tank
- Coagulation
- Flocculation
- Clariflocculator
- Lamella clarifier
- Capacity
Tailor-made
According to your speeds and variations.
- Process
Physico-chemical line
Buffer tank, C/F, lamella
- Oils & Waste
Recovered oils
Less waste to process.
- Integration
Compact & modular
Installation in a constrained workshop.
Project Background
In a metallurgical industry, detergent degreasing baths generated large volumes of oil-laden water, which were expensive to treat and environmentally penalizing. It was necessary to separate the oil from the water efficiently, reduce waste directed to specialized channels and preserve the organization of the workshop (trolley passages, limited space), without disrupting production.
Objectives
To design a compact, physico-chemical, ready-to-connect line capable of homogenizing effluents, treating flow variations and maximizing oil recovery. To stabilize wastewater flows, limit the residues to be disposed of and offer a modular solution, simple to operate on a daily basis and optimisable over time.
Technical solution
Implementation of a complete chain: buffer tank for homogenization and flow regulation, coagulation in a static mixer, dedicated flocculation, then compact lamella clarification. Inclined plates speed up solid/liquid separation, while an overhead device allows floating oils to be recovered for recovery. The sludge is sent to suitable containers, the treated water is sent back to the chosen channel (discharge, internal recycling or additional step).
CNC prefabrication & modularity
The equipment (buffer tank, coagulation-flocculation module, lamella clarifier) is prefabricated and tested in the workshop, assembled in ready-to-connect modules. The compact design makes it easy to integrate into a constrained workshop, the modularity allows the line to be quickly adjusted to actual flow rates or new production requirements, and to consider relocation later if necessary.
On-site implementation
Installation of prefabricated modules as close as possible to the production points, with minimal hydraulic and electrical connections. The project focuses on the installation of the buffer tank, the connection of the transfer lines and the installation of sludge containers and oil recovery devices, while preserving circulation (trolleys, work areas).
Commissioning includes calibration of reagent dosages, stirring speeds and flow rates, as well as validation of oil, sludge and treated water circuits with the operations team.
Results
The combination of buffer tank + coagulation–flocculation + lamella clarification ensures a clear oil/water separation. Oils are recovered and recycled, the volumes of waste to be treated in specialized channels are greatly reduced and effluent flows become more stable. In operation, the line is robust, with regular performance and controlled operating costs.
Operation & Maintenance
The operation is based on simple sequences: visual control of the buffer tank, adjustment of reagent dosages, monitoring of levels in the lamella clarifier, periodic oil recovery and management of sludge containers. The operating procedures (emptying, cleaning, safety) are documented for a quick handling.
Maintenance remains limited: a few mechanical components, regular checks of the dosing equipment and visual inspections of the lamella and the buffer tank.
Key figures
- 1 BT66-M buffer tank — homogenization & flow control
- 1 compact clariflocular CFC.DLC — integrated coagulation, flocculation & lamella=
- 2 streams recovered — recovered oils & stabilized treated water
Product focus: Compact Clariflocular (CFC. DLC)
To treat detergent degreasing baths, the compact clariflocculator CFC. DLC combines coagulation, flocculation and lamella clarification in a single module. Installed downstream of the buffer tank, it ensures a clear oil/water separation with a small footprint.
The machine is delivered ready to connect: reagents, static mixer, flocculation area and lamella clarifier are integrated and optimized for oily effluents. The floating oils are recovered at the head for recovery, the sludge is sent to containers, and the treated water is returned to the chosen sector.
- Line C/F + lamella
- Recoverable oils
- Less special waste
- Compact & plug-and-play
- Adapted to flow variations
Product focus: BT66-M buffer tank
Installed upstream of the CFC compact clariflocculator. DLC, the BT66-M buffer tank is the regulating heart of the detergent degreasing processing line. It receives the leaching effluents, homogenizes the mixtures and smooths out the flow variations before coagulation-flocculation and lamella clarification.
The pool is equipped with 316 L stainless steel lift pumps (number adaptable according to needs) and a safety overflow. This device makes it possible to cap peak flows and send effluent to the CFC. Controlled flow and to prevent any risk of overflow in the workshop. A dedicated oil change also facilitates the management of cleaning or prolonged shutdown phases
The result is a stable power supply to the clariflocculator, improved separation performance and a process that is much easier to control on a daily basis
- Flow regulation
- Stainless steel pumps
- Ongoing operation
- Flow smoothing
- Buried version
Steps to collaborate
- Effluent diagnosis — flow rates, loads (oils, suspended solids), daily variations.
- Layout study — workshop plans, circulation, container routing.
- Preliminary design of the physico-chemical line — buffer tank, C/F, lamella designing.
- Design & manufacture — prefabricated modules, shop floor testing.
- Installation & Connections — on-site installation, hydraulic and electrical connections.
- Commissioning & support – reagent adjustment, operating procedures, follow-up of the first weeks.
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BT66-M buffer tank
buffer tank -
Compact Clarifloculator CFC.DLC
Coagulation flocculation
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