Automotive wastewater treatment
Water plays a key role in the automotive industry, especially in surface treatment (conversion coatings), painting, and cleaning processes. These processes require strict quality control and water management to meet operational efficiency and environmental standards. With a wide range of water streams, from oily wastewater to rinse water metals, solvents, paint residues or surfactants, automotive companies benefit from integrated systems that allow separation, reuse and compliance with strict discharge norms.
Water challenges in the automotive industry
Manufacturing a single car can consume thousands of litres of water, and plants produce wastewater laden with pollutants such as zinc, nickel, COD, mineral oils or AOX, which are subject to strict discharge thresholds.
Importantly, automotive sites performing surface treatments fall under the scope of two EU BREFs:
- Surface Treatment of Metals (STM)
- Surface Treatment using Organic Solvents (STS)
Compliance with these BREFs means adhering to BAT-AELs (Best Available Techniques - Associated Emission Levels) for parameters like heavy metals and solvents, and aiming for BAT-AEPLs (Associated Environmental Performance Levels) such as:
- Specific water use in m³/car
- Waste generation in kg/car
- Discharge load per vehicle produced (e.g. kg COD/car, g Ni/car)
Trevi’s approach to automotive wastewater treatment
Trevi’s water treatment in the automotive sector focuses on reuse, precision and compliance. After a detailed analysis of process streams we design custom treatment for as well closed loop systems in processes as end-of-pipe solutions, using techniques like coagulation/flocculation, filtration or membrane separation. Physicochemical treatment (coagulation/flocculation) is used to remove heavy metals, while anaerobic or aerobic biotreatment handles organic pollutants. Advanced methods like membrane filtration, selective ion exchange and evaporation allow recycling of rinse waters as process water.
This results in more stable water consumption cf. BAT-AEPL & effluent cf. BAT-AEL’s, reduced chemical use, and systems that adapt easily to changing production volumes, giving manufacturers better cost control.
Automotive water treatment projects
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