Our Chemical-Physical Treatment Plant in Bremen, retrofitted with state-of- the-art technology in 2005, can deal with about 190 000 m³ of liquid waste annually.
The Chemical-Physical Treatment Plant is designed to deal with liquid wastes that could otherwise cause harm to the environment. In the plant, these liquids are either separated into their individual components or neutralised to render them harmless.
For example, emulsions from the metal working industries are delivered by suction vehicles or in small casks holding up to 1 000 litres. These are then drained, over vibrating screens, into one of 3 deep tanks. The vibrating screens remove contaminants and rejects which are larger than 4 mm in size. The exhaust air generated during this process is cleaned using a filter system prior to releasing the air into the environment.
Separation of oil and water
With the addition of acids, the delivered emulsions are chemically separated into their components, water and oil. Following on from this, the oil phase is physically separated from the water phase using a cascade system. Both phases move on to be treated further: oil in the decanter plant and water in the cracking plant.
Decanter Plant - Cleaning of oil
The oil, split from the emulsion, is heated with a recuperator and further separated using a decanter. Outputs are oil, water and sludge. The Water, separated during this stage, is also fed into the cracking plant for treatment. The recovered oil is collected for thermal utilisation or to be further refined.
Cracking Plant - Water treatment
The acidified water, generated during the initial process of cracking the emulsion, needs to be neutralised with the application of several chemicals. After the analysis in our own laboratory and observance of the relevant discharge parameters, the neutralised water phase is finally drained into the sewer system of the City of Bremen.
Drainage of sludge
The sludge produced during the neutralization stage, is further dewatered with the use of a membrane filter press. The final sludge is either landfilled or treated thermally, depending on its composition.
E-Mail: Ralf.Duesmann@nehlsen.com Phone: +49 421 6266 247