Chemical-physical treatments
Hot forging
Company introduction
The metalworking company produces automotive gear parts in north-west Italy.
Company requests
In the process of steel hot forging, the company uses graphite as a release agent. The water polluted with graphite and oil is treated in a small evaporator. Treatment is expensive and inefficient and the system needs to be improved.
Problem
The presence of oil (sometimes in considerable quantities) together with graphite makes the wastewater particularly hard. The evaporator takes 24 hours to treat 500 liters per day of wastewater and the water produced is a minimal amount. The energy cost is high and the operator is forced to stop and clean the evaporator weekly.
Solution
The preliminary study took some time to establish the best combination of products to manage the process. The wastewater (about 1mc per day) is treated through a very compact DP1 system. The dosage of chemical products insure the separation of oil and graphite from the water that can be inlet in the cooling tower.
Technical conclusions
The customer doubled the volume of treated wastewater, drastically reduced energy consumption, reduced about 90% the cost of disposal and substituted the evaporator with a much less expensive installation.