GN solids America

The company who provides environmental
protection service may have the business for dredging in rivers or lakes. Many
years’ soil sedimentation down to the water bottom, leaves falling into the
water and then rot, and the trash threw into the water will make the river bed
higher and higher which leading the pollution of the water and even the cutoff
of the river flow. Therefore, we need find a solution to take out the sand,
silt and trash at the bottom of water to make the water clean.

To take the solid stuff out from the water,
we need a solid and liquid separation system to do this job. As a leading
manufacturer of solids control equipment, GN solids control luckily
jointed a project to make the lake water clean inside a residence district.
There is a dredging boat that can take the solid mixed with water from bottom
of the lake, the dirty slurry was sucked out and delivered on to the land with
smelly smell.

The slurry is fed via a steel wire box
where large size solid stuff will be blocked and collected. Then the liquid
will be pumped to GN’s solids control system. In this system, GN designed 3
stages for solids control including shale shaker,
de-sander and de-silter. Both the de-sander and
de-silter are equipped with underflow shaker that could make the discharges
from cyclone much dryer. After treated by the de-silter cyclones, the solid
stuff with size larger than 15-20 microns will be removed. And the rest solid
in the slurry is difficult to remove by using mechanical machinery.

Flocculation is a good method to gather the
ultra fine solids in the slurry. Add the flocculation agent into the slurry as
per certain ratio and then fully mix with mud agitators. The
flocculated slurry will need several times for sedimentation and then will be
pumped to belt filter press for final dewatering process. The solids will be
discharged with a thin cake shape, and the water could be discharged directly
back to later or river.  

The advantage of the filter press is to
make the solids much dryer, and disadvantage is high cost and small treating
capacity. Some other contractor will use decanter centrifuge to do the final
dewatering job on consideration of its larger treating capacity.

We are negotiating our first AD grit removal contract (potential 3000 ton). We will use the unit that is on the way for this.
We are putting a package together for sewage sludge, consisting mainly of rags and grit separation. First process will be the removal of the rags and for this we will have to make adjustment to a single deck shaker by adding spray bars underneath the shaker deck to be able to clean the mesh if it gets blocked. We can do this as a retrofit here but would prefer if it can be designed and constructed in your factory. We will need a buffer tank with pump to feed the spay bars incorporated in the unit ( fresh water fed). Video attached. We are looking at shaker:
GNZS703E-DZ  one or two units to match 240m3 desander
After removal of the rags we have to deal with the grit and believe this should be done with a standard desander unit. GNZJ703E-D1S8N/ GNZJ703E-2S12N
We might want to add on to this a desilter unit or small centrifuge. The water for the spray bars can come from fresh water supply and does not have to be recycled as disposal of water is not a problem at sewage treatment plants.
All to be mounted on a tank with appropriate compartments.

We might need a suction pump (chopper pump type) to chop rags up to smaller bits and to deposit on the first shaker.
Ideally none of the units to be longer than 2500mm so we can fit it broadways onto the lorry deck, together with walk ways and access ladder.

Before starting today’s article, we would like
to tell that the decanter centrifuge mentioned here is 2 phase type centrifuge
used in to separate the solids and liquid where the slurry is coming from the
drilling site. The slurry includes drilling fluids, oil sludge and so on.

Decanter Centrifuge Applications

On drilling site, the decanter
is used in solids control system as the final stage solids
control equipment to remove the fine solids in the drilling mud or to recover
the barite in drilling fluids. While the decanter centrifuge can also be used
as a machine to polish the effluence discharged from the vertical cuttings
dryer in waste
cuttings management system
. In the dewatering system, we can also find the
decanter centrifuge that is used to treat the flocculated slurry in which the
ultra fine solids can be separated out.

How to Operate Decanter Centrifuge as per

GN’s 2 phase decanter centrifuge is always
used to separate solids and liquids. According to different request, we can get
the different discharges. If you want to get much dryer solids, you can
increase the feeding capacity, increase the rotating speed, adjust the liquid
level plate to a low position or reduce the differential speed. By doing any
one mentioned before, you can make the solids discharged much dryer. And if you
reduce the feeding rate, reduce the bowl speed, fix the liquid level plate on
the bowl big end to a high position or increase the differential speed, you can
get a much clear liquid. Sometimes, you need make adjustment for several of the
factors at the same time to get the expected result according the project
request. In dewatering system, the amount of flocculation agent added in the
fluids would change the dryness of the discharged solids and liquid.

GN’s latest C version decanter centrifuge
with VFD control
is an ideal machine to do all the above jobs, as it can be adjusted
easily via HMI system to run at RPM from 0 to more than 3000.

GN Solids Control has been working in the
solids control equipment design and manufacturing for many years, with an
engineer team of more than 20 years experiences, GN Solids Control is familiar
with the solids
control shale shakers
, and also more professional in shaker screens than
other shaker screen companies.

The shaker screen’s quality affects the
shale shaker’s performance:

1. When the screen mesh is of better
material and well sealed, the service life of each screen is longer, and
enhances the whole efficiency of shale shakers. GN Solids Control use high
quality SS304 or SS316 for mesh cloth material of shaker screen
from reliable supplier.                                             

2. the rubber chosen for the shaker screens
Is important also, if the rubber is too hard, it couldn’t serve well for
sealing and the cushion function is less active. While if the rubber is too
soft, it could be easily worn. GN has tested its shaker screens on their own
shakers and also GN clients has used GN screens on their shakers of many

3. the glue used between the screen mesh
and screen frame is important also, GN Solids Control chooses
an brand from North American supplier for the glues.

4. the screen frame material and screen
frame welding determines the service life of shaker screens. For shaker screen
frames GN has 2 options, the steel frame one and the composite material one. Both
welt by professional

Now, some of GN produced shaker screens are
for GN’s own shakers, and some are ordered by old clients for other USA or
European brands. Some other equipment manufacturers ask GN to help design the
suitable structure for their customized and special screens. And GN screens are
enjoying good fame. If you have inquiry, welcome to visit our website or
contact sales directly.

GN Solids Control is China leading manufacturer
of compact design mud recycling
/ cleaning system
for HDD, CBM drilling and water well drilling. GN mud
desanding plant for micro tunneling, piling and other trenchless activities is
also sold well.

GN 500 GPM mud recycling system for HDD and
water well drilling has be dispatch for Middles East. The system is catering
for mobile unit, and can be used for water well drilling, horizontal
directional drilling (HDD), Coal bed methane (CBM drilling), as well as oil and
gas drilling.

Equipment included in the 500GPM Mobile
unit mud system:

1) GNZS703E-ZD shale shaker, 1 ea

It is a linear motion shale shaker with 3
panels. The shaker is equipped with back type feeding box for a lower feeding
height. In case the mud will be flowed to shale shaker directly through

Features of GNZS703E shale shaker

a. It utilizes the most reliable linear
motion for a stable performance.

b. The shaker model utilize pretention
screen, Each screen mounted by 2 ea wedge for fast screen changing.

c. The shale
shaker deck
of GNZS703E shaker is made from stainless steel material for a
better performance of anti-abrasive and longer lifetime.

d. The dumpling spring of the shaker is
steel material internal for more stronger and better performance of vibration
desorption. The spring external is protected with rubber sleeve to prevent
fingers involved in during operation.    

e. The vibration model is chose from
worldwide famous brand: Italy Oil or Martin.

2) GNZJ703E-8S desilter mud cleaner

It is the combination of a shale shaker
GNZS703E and 8 ea 4’’ desilter cone assembly. The 4’’ desitler cone is made
from PU material for long lifetime.

And the cone assembly is removable. In case
needed, the Operator can bolt off the desilter cone assembly and mounted a
feeder box and use it as a separator shale shaker.

3) Slurry pump 1 ea. In case mud maybe stocked
in mud pit, a slurry pump is used as backup.

3) Mud tank 1 ea. The mud
tank is equipped with container block for easy mounted and clocked on the