Mechanical workshops generate effluents containing **lubricating oils with significant levels of COD** (Chemical Oxygen Demand), **hydrocarbons, metals and suspended solids**. These workshop wastewaters may come from a variety of operations such as cutting and drilling, molding, cleaning of mechanical parts, paint shops, maintenance, drainages from settling and sludge tanks, and from a variety of industries such as **automotive, aerospace, furniture, appliances**, and many others. These effluents are thus very variable in terms of quality and composition and must be treated properly before disposal since they are a highly pollutant waste, both for the environment and the workplace. ## Oil emulsions in mechanical and workshop wastewater: how we treat oily wastewater A proper management of the **automotive industry wastewater** or of the **aerospace industry wastewater** can be problematic because of their polluting potential and because of the high quantity of water they contain. In **exhausted metalworking wastewater**, that can be called “**oily emulsions**” or “**oil-water emulsions**” for disposal purposes, the oil fraction improves their lubricating capacity, while water increases their cooling capacity. In addition to the oily component, **additives** (i.e. additives for high pressure operations, biocides, corrosion inhibitors, etc.) can also be incorporated, thus the wastewater generated by the mechanical industry, and the metalworking sector in general, has a **high conductivity** and contains: - suspended solids - heavy metals - phosphates - surfactants Even with the best management procedures, the **mechanical industry water-based fluids** do not last indefinitely and require treatment and disposal: EVALED® has developed **wastewater treatment technologies that can dispose of these specific effluents**. ## Mechanical wastewater treatment by evaporation EVALED® wastewater evaporation systems are very easy to operate and can be easily included in the plant after an oil-skimmer. Their energy consumption is negligible (especially for the RVF series), and this makes them a very **competitive treatment alternative for workshop wastewater**. Evaporation allows to achieve different goals: - high quality of distillate - **water recovery** and **water reuse** - **ZLD (Zero Liquid Discharge)** when possible - significant reduction of volume of the waste to be disposed of. On the basis of the average needs in metalworking and mechanical wastewaters treatment, most of the EVALED® references worldwide are installations of: [ ![IDRASCREEN](/sites/g/files/dvc4826/files/styles/content_push_teaser/public/image/2024/04/Idrascreen_cover.jpg.webp?itok=V7yh8YtG) ](/en/daf-technologies/idrascreen-screen-filters "IDRASCREEN") [IDRASCREEN](/en/daf-technologies/idrascreen-screen-filters "IDRASCREEN") Compact fine screening units [READ MORE](/en/daf-technologies/idrascreen-screen-filters "READ MORE") [ ![](/sites/g/files/dvc4826/files/styles/content_push_teaser/public/image/2023/05/RV-F-60-Series-evaporators-for-industrial-wastewater-treatment.jpg.webp?itok=fy6AIeu6) ](/en/evaporators/rv-mvr/rv-f-series "RV F evaporators for industrial waste water treatment") [RV F evaporators for industrial waste water treatment](/en/evaporators/rv-mvr/rv-f-series "RV F evaporators for industrial waste water treatment") Evaporators with mechanical vapour recompression and forced circulation [READ MORE](/en/evaporators/rv-mvr/rv-f-series "READ MORE") ## Application & products MECHANICAL TREATMENTS | Application | Evaled | ADDED VALUE | |---|---|---| | Exhausted oil emulsions | RV, AC, PC | Oil recovery, water reuse, disposal cost reduction | | Moulds release liquids baths | RV , AC, PC | Oil recovery, water reuse, disposal cost reduction | | Quenching baths | RV, PC | Water reuse, disposal cost reduction | | Tumbling baths | RV , PC | Water reuse, sludge reduction | | Parts rinsing waters | RV, AC, PC | Water reuse, disposal cost reduction | | Precious metals waste water streams (laundry & washings) | PC | Metal recovery, disposal cost reduction | | IE regeneration | RV , AC, PC | ZLD, water recovery | | RO concentrates | RV, AC, PC | ZLD, water recovery, sludge reduction | ![](/sites/g/files/dvc4826/files/styles/media/public/image/2023/06/Specialties.jpeg.webp?itok=VZv66rA9) Capabilities ### Capabilities Mechanical parts workshops (Precious metals, Precision, Instrumentation) Automotive (Car, Trains, Motorbikes) engine and main parts production – Tier ½ Aviation engine and main parts production Automotive sub-suppliers – Tier 3/4 Aviation sub-suppliersFurniture mechanical parts production Appliance mechanical parts production Heating & Plumbing parts production Wire production (Copper/Steel/Alu) Defence mechanical parts production Engineering companies [ ![](/sites/g/files/dvc4826/files/styles/content_push_teaser/public/image/2023/05/Steel%20factory.png.webp?itok=RSBTrzJK) ](/en/references "Case studies") REFERENCES [Case studies](/en/references "Case studies") Discover the portfolio of our solutions and implementations around the world. [READ MORE](/en/references "READ MORE") [ ![](/sites/g/files/dvc4826/files/styles/content_push_teaser/public/image/2022/11/EVALED_Evaporator_medicine_Healthcare_1.jpg.webp?itok=EFI1a3Eb) ](/en/daf-technologies "Evaporators") Our Products [Evaporators](/en/daf-technologies "Evaporators") Discover our EVALED® evaporators families and series. [READ MORE](/en/daf-technologies "READ MORE") [ ![](/sites/g/files/dvc4826/files/styles/content_push_teaser/public/image/2024/04/DAF_cover.jpg.webp?itok=Jo3ba_Dd) ](/en/green-knowledge/daf-technology "The DAF technology") [The DAF technology](/en/green-knowledge/daf-technology "The DAF technology") Flotation is a physical process where water is separated from the suspended solids to be reused. [READ MORE](/en/green-knowledge/daf-technology "READ MORE") [ ![](/sites/g/files/dvc4826/files/styles/content_push_teaser/public/image/2024/04/idraflot_multi_DAF_flotation_quality_service_0.jpg.webp?itok=wrb1FZvb) ](/en/services/after-sales "After-sales") [After-sales](/en/services/after-sales "After-sales") A comprehensive after-sales service and technical support programme for flotation units management. [READ MORE](/en/services/after-sales "READ MORE") [ ![](/sites/g/files/dvc4826/files/styles/content_push_teaser/public/image/2023/05/Steel%20factory.png.webp?itok=RSBTrzJK) ](/en/references "Case studies") REFERENCES [Case studies](/en/references "Case studies") Discover the portfolio of our solutions and implementations around the world. [READ MORE](/en/references "READ MORE")