Light liquid separators must be inspected for proper technical functionality every 5 years. Light liquids (oils) are legally classified as environmentally hazardous substances; therefore, the testing standard DIN 1999-100 must be applied.

DIN 1999-100 En prescribes monthly self-monitoring, a semi-annual inspection, and a general inspection every 5 years.

If your company generates oily wastewater, it must be separated using a light liquid separator. Light liquid separators are systems that treat wastewater in the form of a basin. The oils are separated by floating to the surface, while the heavier particles of oily sludge settle at the bottom.

A large proportion of installed separator systems can be found in, among other places:

• motorway service areas and rest areas
• car dealerships
• Car dealerships, workshops and car washes
• Gas stations
• Waterworks
• the industry
• Landfills
• Transport companies and airports

A light liquid separator is a system that treats wastewater in the form of a basin through which oils are separated by floating to the surface.

Before commissioning and every 5 years, all operators of a separator system are required to have a complete general inspection carried out by a qualified expert in accordance with DIN 1999-100.

This inspection also includes the tightness of the inlet system, the tanks, and all technical components. The condition of the inner walls of the shaft components and the calibration of the automatic closure system are also examined. The operating log, the availability of technical and regulatory documentation, permits, and proof of disposal of the separated contents of the system are likewise checked.

The actual wastewater flow must also be assessed with regard to its origin, quantity, substances, detergents and cleaning agents, operating and auxiliary materials, compliance with boundary conditions, and, in relation to this determined wastewater flow, the suitability, performance, and dimensioning of the separator system. All deficiencies must be recorded in the comprehensive test report and, if necessary, rectified in consultation with the responsible authority (section 14.6 of the standard).

During the leak test, the separator system is normally filled to ground level. The loss rate is typically 0.25 liters.

Even for systems that are free of defects, the inspection reports, the operating log, and the disposal records must be documented. These documents must be submitted to the responsible supervisory authorities or the operators of the respective municipal wastewater treatment plants upon request (section 14.7 of the standard).