GN Solids Control have been in waste management business from the time we spent R&D, resource & found to develop the vertical cuttings dryer, which also make us get through the bad time, when the oil price hit the floor. Now more and more countries are strict on environmental protection, though we have done a lot of things wrong, now we are going to fix it.
Oil sludge treatment, soil remediation is this kind of project, a capricious dump when the old projects are done, now more hassels need to be fixed. Oil dumps, waste mud, damaged soil etc. As a pioneer for waste management, GN have spent 2 years on TDU, thermal desorption unit research and development, now almost done.
The oil sludge treatment is more a system work, with shale shaker, decanter centrifuge, flocculant unit, heating tanks etc, to separate the solids into different phase.
As most of the oily sludge is a mixture of oil, water and soil, this oily sludge treatment is always a 3 phase separation process. Rather than a 3 phase decanter centrifuge, GN proposed a series modular equipment to do this 3 phase separation job with high efficiency. GN oily sludge treatment system has followed 3 main functions: solids and liquid separation, demulsion process and oil water separation. All the functions are realized within different tank and skid module.
Well this is not the whole system, it is part of it. This time in Uganda, a Chinese service company have packaged GN equipment, and now it is running.
With more and more experience, and upated equipment, GN will be able to supply better and better solution for the environmental protection.
The first mud recycling system was used for construction project in UK, it was designed as a mobile unit to the construction site, to save hassle of dirty mud. Normally that was one way to do it, another way is more often happend in Singapore, with a vacuum truck, the mud is transported to a certain place, and all the mud will be handled there.
This is sort of new business, as it happend because people now care more and more about the environment.
Lots of this kind of projects in other place also, such as Australi, and this time US. This client have their own exist mud system, to extend their business, they need one more system. The desin principle is mud similar as the one they already have.
For this one, shale shaker with a small tank as scalping unit, then the mud cleaner sitting in a bigger tank beside this unit, as next stage. After the desilter cleaning, the mud goes to the centrifuge, for better separation, whilst the polymer will be added, to help dosing the small particles. Then most of the solids bigger than 5micron can be separated.
Well normally the cut point of the shaker is 400 micron, the desander would be 75micron, desilter 25micron, decanter centrifuge is 2~5 micron. It is separated stage by stage.
A small dosing unit also included in this system, for chemical enhancing, GN have several different modular design, one is put all into a 20ft container, as dewatring container; then like this one, just keep it simple, a stand unit; also can put all chemical dosing, and centrifuge in one big container. Either way have the same purpose.
After grinding mill, need dewater the solids, with strong acid. That was the situation we had, then cooperated with client, we worked together to find a solution. For shale shaker feeding, we choose vertical Netzsch pump, after the shale shaker, the fluids to a small intermediate tank, sucked by a horizontal Netzsch pump, feeding to the GN decanter centrifuge.To achieve higher capacity, and higher G force, this time we choose a 18in decanter centrifuge, which is GNLW453, with varible speed, the model: GNLW453-VFD, this model is equipped with a variable frequency control panel to realize the different rotary speed. By adjusting the speed, feeding rate, liquid level inner the bowl, the operator could adjust dryness of the discharged solids and clarity of the effluence. The shaker and decanter centrifuge need to be seated on a mud tank so that the liquid discharged could be collected properly. The tank is divided into 2 compartments for collect the effluence respectively from shaker and centrifuge. A mono pump is also fixed on the tank skid for transferring the sludge from tank #1 to centrifuge for further process. For this system, GN have required the materil from Vietnam to the real testing inside factory, before shipment, doing which to make sure the result is as expected. Before getting into this separation system, the operator would have a pit to collect the flushing sludge and then use a pump transfer to the shaker unit. GN’s equipment are widely used in many industries for solids and liquid separation like drilling fluids recycling, dredging slurry separation, crude oil storage tank bottom flushing water recycling etc. Welcome different applications wherever need solid / liquid separation, GN is ready to help.