Oily sludge treatment systems are quite important solutions for the oil and gas industry, especially for the refineries. A professional solution can help the contractor to separate the oil, water and solids, and finally reuse the water, recycle the oil and reduce the solids discharge’s volume and damage for the environment.

Based on the requested treating capacity, GN Solids Control designed 3 models of OST systems GNOST-01, GNOST-05 and GNOST-15. All three models are combined by 3 steps for separation, with only difference as each equipment capacities. The treating procedures are functioned by following steps:

1. Shale shaker. Shale shaker can take out the most particles in the sludge by using suitable screen mesh sizes. In case the sludge has a high viscosity or the oil is wrapping on the solids so tightly, we can use pre-heating facilities and pre mixing for the sludge to break the linkage between the oil and solids for easier separation.

2. Decanter centrifuge. Decanter centrifuge is used to remove the particles from 2 to 5 microns with a high rotating speed, comparing with other equipment to separation, the decanter centrifuge is quite efficient and the separation is thoroughly.

3. After the decanter centrifuge, there should be a disc stack or a three phase centrifuge for the separation of oil, water and solids. Here before entering this step, the solids particles become no quite a lot. The main function is to separate the water from oil.

Here, for this client in Beijing, GN Solids Control provided a system of GNOST-15, including a GNZS594F shale shaker, a big bowl centrifuge GNLW-554ET and a three phase centrifuge GNSX-554ET. And there is a chemical dosing unit together with the whole system and preheating and pre-mixing devices before the sludge comes into shale shaker and decanter centrifuge.