Last week , a Latin America environment company focused purchasing several dewatering equipment for their project. The are screw press dewatering machine , Decanter centrifuge and chemical dosing unit. As one of the earliest separation company in China, we have more than 15 years experience on manufacture and equipment development. We exported equipment to more than 76 countries. Till now, GN own 3 manufacture foundation. Equipment application include oil gas, food beverage ,environment industrious. And environment sales is raising quickly. And we are also put more effort on the environment industry and serve our customer.

In these equipment we sold to customer. All these equipment are small treating capacity and mobile unit. Such as the decanter centrifuge. Client take it to the job site for some small treating capacity project, customer do not need to transport the waste into water plant. The decanter can process it well at job site. Which also equipped a bottom tank as buffer to convent customer to connect other equipment for further treatment, because the Decanter centrifuge is not good at separating the particle size smaller than 5um.

Client also purchased 1 unit 201 screw press dewatering machine and 1 unit 202 screw press, the 101 model equipped 1 500L/hour chemical dosing unit to feeding polymer. Screw press dewatering machine is good at separate out the material that solids content less than 5%, especially in some soft bio material. But if the particle is too small smaller than 10um. It is hard for machine to separate, we need to polymer to combine small particle to big one. The automatic chemical dosing unit can adjust and feeding medicine to material ,and help screw press to get better separation effect.

Our advantage is providing customized solution for customer, include select the optimal equipment model to solve problem and save money, and the solution must friendly to environment. If your have similar project demanded to solids-liquid separation, welcome to contact us.

Our Houston branch GN Solids America LLC just sold one dewatering system to local for construction slurry treatment. This system will be used to remove out solids from slurry and recycle water from sludge. The recycled waste will be used again as building material.

This system is not only applicant for construction slurry, but also hydrovac sludge treatment. It is a integrated system, which can sort out different size particle. The system include slurry catching hopper, mining shale shaker, mud cleaner, decanter centrifuge and also chemical dosing unit. The catching hopper has a steel filter in the surface, customer can directly dump waste into the hopper, the hopper will filter out big stone to avoid it damage separation equipment. slurry though the hopper drown into mining shake. It is a big shaker with large treating capacity, in this step. The grave and big size sand, these discharged can be used as building material. Discharged liquid will feed into mud cleaner. The mud cleaner include 10 inch hydrocyclone and 4 inch hydrocyclone. 10 in hydrocyclone is for removing particle size bigger than 60um, 4inch is to remove out bigger there 25um. Mud cleaner also mounted a bottom shaker with high mesh screen, it can separate the fine tiny.
In some project, the slurry after treating by mud cleaner is enough for reuse, but in some special project ,customer will require to get the liquid mucus cleaner much better. So we will feed liquid into Decanter centrifuge for finally separation. Different with shale shaker, it utilize centrifuge force generated in high rotated speed. Different density material under this high G force will be separate off. If the solids particle smaller than 5 um, flocculant will be feed through chemical dosing unit to combine tiny solids into bigger to help Decanter centrifuge to separate out these solids.
Actually, We had provided more than 15 systems in North America. Our system is very popular due to the good separation effect and high cost-effective. Every system is customized production according to client requirement. If you have demanded on our equipment, welcome to contact us.

Last week we shipped out 3 units GN vacuum pump and one screw press dewatering machine to our old client from environment industry. This customer almost purchase all dewatering equipment and pump from GN, The quality of our equipment satisfied client, they are a big fan to GN equipment.
GN Separation and transfer is one brand of ours. GN separation main focus on developing solids-liquid separate and also material transfer. Such our shale shaker, decanter centrifuge, disc centrifuge and screw press dewatering machine. according to the material situation, we can recommend suitable mode equipment to get the best treating result.

GN transfer equipment include centrifuge pump, centrifuge pump, screw conveyor and also GN solids vacuum pump. All these equipment is widely sued in the world. Such as centrifuge pump, it is 100% interchangeable with MISSION Magaum, it is one kind high efficiency and stable machine. GN Solids vacuum pump is our most feature product, it is different with normal pump, which can transfer dry solids size smaller than 75mm, and also have good performance to transfer high solids content material and high viscosity material. The transfer distance can reach 1000 meters. GN is the only China vendor that can manufacture this kind pump. In some material transfer such as oil sludge , sand ,drill cutting, GN vacuum pump is best optional.

Screw press dewatering machine normal to dewater the material that solids content less than 5%, which is especially good at process the organic material and soft material. The discharged solids is very dry, comparing with other kind dewatering machine, screw press is low power consumption and continuous work, easily operate and maintain. In some tiny solids material, we also recommend mix with flocculant to combine small particle into bigger one to help the machine get better dewatering effect.

Not only equipment, GN also can provide whole set separate solution, we are a manufacture with full experience technical department. If you have demanded, welcome to contact us.

In most waste management project, the waste material normal include vary kinds material, not only water, but also oil. This week we delivered one unit tricanter centrifuge to Africa client for the oil tank sludge treatment. Different with 2 phase Decanter centrifuge ,tricanter is 3 phase separator for liquid liquid solids separation. Which principle is same with decant centrifuge. Through the high rotating speed generate the high G force, the different undissolved material will bear different G force due to their density is different. and then the different material will be in different layer. The high density solids will settle down to the bottom of Decanter centrifuge. And the lighter solids will be on the up layer.

The most application of tricanter centrifuge is for oil water solids 3 phase separation. It equipped a centripetal pump inside the centrifuge rotating bowl, and it will pump the oil out of centrifuge. The solids will be push forward and discharged from small end of centrifuge, water discharged from big end. In this Africa project, waste material from the bottom of oil sludge tank. Which include large crud oil ,water and solids. Customer want to separate out the solids , water. And get the clean crude oil.
These waste was flushed thorough high pressure water. And through screw press to feed it into 3 phase decanter centrifuge. Under the more than 2000 G force, water oil and solids will be separated. In some project, we may add the shale shaker to treat the material first to remove out the big size particle, and reduce the solids content. Finally feed it into 3 phase decanter centrifuge. The low solids content will improve the treating capacity of centrifuge and also get good separation performance.

GN can provide the customized solution according to client requirement. shale shaker, Decanter centrifuge , screw press, chemical dosing unit, all these equipment may be used for client project. If you have demanded on these equipment, welcome to contact us, we will be pleased to provide technical support.

One our Canada client asked give out solution for the fermentation liquid separation. This fermentation is from animal manure, client want us remove out the solids as much as possible. It is different with other separation project ,because the solids content is small.

According to the data sheet of material, the solids content is less than 5%, and the most of the particle is smaller than 75um. As usually we will suggest client to add flocculant chemical to material to combine the tiny solids into bigger ,and then feed it into decanter centrifuge. But in this project, it is forbidden to add any chemical medicine. That is the biggest challenge in this project. One other challenge is the flow rate is 25m3/Hour.

In this kind project, 2 phase disc centrifuge is the best optional, but due to the huge treating capacity, we need to use several sets disc centrifuge as it treating capacity is only 8m3/Hour. That will increase the cost of equipment. After discuss with engineer, firstly we will feed the material into decanter centrifuge to reduce the solids content as much as possible, and then feed the liquid into disc centrifuge. The lower concentration liquid will improve the separation capacity of disc centrifuge.
In this project, client have no requirement to the dryness of discharged solids, so we do not need extra dryer facility for further treatment. because the discharged solids from disc centrifuge is very wet, it through the flush water to discharge solids. Different with disc centrifuge ,the discharged solid from Decanter centrifuge is very drey,but the liquid is not as clean as disc centrifuge.
GN Decanter treating capacity from 6 cube meter to 120 cube meter with vary model ,and the disc centrifuge capacity is between 1 cube meter to 25 cube meter. All these capacity is calculated when treat the clean water. We almost can satisfied all the project demanded. If you have demanded on these equipment, welcome to contact us .

Last week we delivered 1 set slurry processing system to customer for their TBM project. Tunnel boring is one very popular system to for the tunnel project , especially for some city subway building. In the boring program, it also need drilling mud to cool the rig machine and flush the solids ,and take it our from the tunnel. This will consume large water to mix the drilling mud. Drilling mud is very expensive and high pollution, it is very necessary to recycle it for reuse.

In this customer project, the job site is at downtown of city. The customer require our system to dryer the solids as much as possible to convenient transportation. And do not allow the liquid out of system and pollute the job site. This project is in winter, so we load all equipment into container to make sure the equipment will work under the best most adapt temperature. For this project, we recommend our GNLW764 Decanter centrifuge and chemical dosing unit .GNLW764 is the biggest Decanter model of GN, the diameter of centrifuge bowl is 760mm , and the length is 4 times of diameter. The wider bowl diameter means the Decanter can generate biggest G force under the same rotated speed. Actually, this model Decanter will generate 3000G force when the speed reach 2600 RPM. The discharged solids will be dry enough. The model Decanter capacity is 140m3/hour, we only need one unit to finish all the slurry processing job.

Except Decanter centrifuge, the automatic chemical dosing unit will mix flocculant and feed it into material. The tiny particle smaller than 5 um will combine into bigger particle by the flocculant influence. It will help decater centrifuge to separate out the solids and get more clarify mud. In the system , you may see the discharged solids from Decanter cent will be directly transfer away by screw conveyor. All the treating process need less labor work.

GN is good at provide the customized solution for drilling mud treatment, we have more than 15 years in this industry, if your project have demanded on our equipment, welcome to contact to us.

China is a leather manufacturing country and consumption country, the output and demand are very huge. The leather industry has caused great pollution to the environment. With the concept of environmental protection deeply rooted in the people, whether the pollution discharge of leather wastewater can be effectively solved directly affects whether the leather industry can continue to survive, develop healthily and steadily.

Leather production is mainly wet operation, through physical, chemical and mechanical processes of various raw materials into finished leather. Because most of the work has water as the medium, the preliminary statistics of each production of 1 ton of raw material skin to discharge 60~120 tons of wastewater. In the process of leather production, there is a huge amount of water consumption and sewage discharge demand. Leather wastewater is a kind of industrial wastewater which is difficult to treat. The application of decanter centrifuge to the treatment of tannery wastewater is a technological progress.

Analysis of tannery wastewater, sewage mainly comes from the wet operation preparation section and tanning section of tannery production, including soaking wastewater in leather soaking section, degreasing section wastewater, soaking and removing ash and washing section wastewater, acid leaching wastewater, chrome tanning process wastewater and dyeing grease wastewater, which makes the converging wastewater contain a large amount of organic matter (protein, dye, grease), inorganic matter (sulphide chromium salt, etc.) and sediment harmful substances such as wool residue oil sludge. The practice shows that good economic and environmental benefits can be obtained by using decanter centrifuge to participate in the treatment of tannery wastewater. It can not only change the working environment of leather processing place, but also make the pollutants stable Standard, and the cost of wastewater treatment per ton can be reduced by nearly half, realizing the win-win of environmental and economic benefits.　

The idea of decanter centrifuge participating in tannery wastewater treatment:

Leather wastewater-coarse filtration pretreatment-dosing precipitation-lying decanter centrifuge solid-liquid separation-material recycling.

Horizontal centrifuge involved in tannery wastewater treatment process:

According to different tannery processes, the general components of sewage were analyzed. Through biochemical method, the organic components were decomposed and transferred, and the inorganic components were flocculated and precipitated by horizontal screw centrifuge. After purification, the water quality is up to standard and the organic compost is used as fertilizer.

decanter centrifuge to participate in tannery wastewater treatment station setup:

The main facilities are grille, pre-regulating tank, primary settling tank, oxidation ditch, secondary settling tank, air floatation tank, sludge thickening tank, sludge scum recovery facility and medicament dosing facility;

Pretreatment: waste water through fine grille can intercept a large number of floating matter, iron oxide and suspended matter, it can achieve the purpose of continuous removal of various shapes of small debris, verify the normal operation of subsequent treatment process equipment, in order to reduce the load of subsequent treatment structures;

Precipitation regulation: the waste water is treated by the grille machine and enters the regulating tank. It adjusts the water quantity and water quality while removing the oil slick in the water through the oil collecting pipe;

Flocculation and precipitation: germicidal disinfection of hypochloric acid, precipitation of metal alkali lime, regulation ph sulfuric acid, flocculant.

Filter press and decanter centrifuge are common solid-liquid separation equipment, the quantity is very large, GN discusses with you the technical advantages of solid-liquid separation production line machine from filter press to decanter centrifuge:

1. Decanter centrifuge without filtering medium

Filter press pressure filtration of filter medium (filter) to separate solid and liquid, need to use high pressure water to avoid filter belt obstruction; decanter centrifuge high speed rotation to produce centrifugal position to separate solid-liquid centrifugal settlement, It is not suitable for filter medium because of filter screen, which bypasses the common filter clogging problem in filter operation.

• Decanter centrifuge is widely applicable

Filter press can also most of the solid-liquid separation, but the oil, viscosity and other strong adhesion of solid-liquid separation needs pre-treatment and incomplete separation; decanter centrifuge separation adaptability, can achieve solid-liquid two-phase separation and solid-liquid three-phase separation, better adaptability to solid-liquid separation.

• Automation of production line of decanter centrifuge 

Filter press is intermittent operation of manual cutting slag, loading and unloading belong to intermittent operation most or need manual coordination is not conducive to the formation of automatic production line to improve production efficiency; decanter centrifuge can realize automatic loading and unloading continuous production automatic loading and unloading can form automatic production line production efficiency.

• Decanter centrifuge parameters adaptive adjustment ability

In the process of solid-liquid separation and dehydration, the belt filter is adjusted according to the working conditions, and the parameters such as speed, tension, dosage and flushing pressure often depend on the experience of the operator, which requires high operation technology.

• Low consumption of pre-treatment material for screw centrifuge

Because the filter filter media (mainly filter) mesh will not be very small, so the particle size should not be too small, small particle size should be added a lot of flocculant complex to synthesize large groups to facilitate filtration, which results in the consumption of additional pretreatment materials In decanter centrifuge, fine sludge can also be separated from water, so the dosage of flocculant is less, saving material input and reducing production cost；

• Decanter centrifuge production line environment is good

In addition to the main filter press, the filter press also needs to add medicine and feed conveyor to flush pump air compressor and other ancillary equipment, covering a large area, the whole machine is difficult to airtight, high pressure cleaning water mist and odor pollution environment, poor production line environment; decanter centrifuge covers a small area of high efficiency, supporting equipment simple complete machine seal operation, workshop environment is good

• Low maintenance requirements for decanter centrifuge

The number of easily damaged parts in the fuselage accessories of filter press is many times that of centrifuge. Maintenance is not only labor intensity but also high cost.

It can be seen from the above comparison that the comparison of decanter centrifuge with filter press under the same processing conditions has great technical advantages, and solid-liquid separation from filter press to decanter centrifuge is the trend of development.

The distillery directly sells / sends the distiller’s grains wastewater produced in the production process directly to the local pig farm, fish farm, shrimp farm, or earthworm farm as the direct feeding fertilizer is the simplest, most direct and economical treatment method. As a result, distiller’s grains wastewater can be digested on the spot without destroying the local ecological environment. It is also a very economical feed source for local third parties such as pig farms and fish farmers and shrimp farmers. Winery can also do not need to invest more cost to consider sewage discharge and a series of environmental issues. This treatment is the mainstream treatment of small and medium-sized distilleries for many years. With the outbreak of African swine fever in our country, the number of pigs in pig farms With the waterfall-style collapse, the demand for distillers’ grains in pig farms, one of the main places to go, has also plummeted, with the result that distilleries in many places have chosen to store the excess grains temporarily after simple solid-liquid separation, waiting for the swine fever epidemic to pass before shipping them to pig farms. But with the outbreak of swine fever, regulatory requirements for the source and quality of feed have increased, and swine fever has continued longer than expected, making it impossible for more and more distilleries to hoard distillers. Other treatments must be considered.

If distiller’s grains can not be sold to local third parties for local digestion, the simplest and most traditional method is biochemical treatment. The so-called biochemical treatment is that after the solid-liquid separation of distiller’s grains wastewater by centrifuge, the wastewater is discharged into a biochemical tank. After a series of steps, such as anaerobic, aerobic, sludge reduction and so on, the BOD and COD content in the wastewater are reduced to meet the national discharge standard. The solid slag (distiller’s grains) separated by centrifuge is dried and treated as solid waste. Using this way to deal with is actually helpless. This treatment is direct and simple, but the time, site requirements, and distiller’s grains are uncertain Processing methods can not become mainstream for a long time. Different distiller’s grains wastewater, in different climates, the time required to treat a batch of distiller’s grains wastewater varies from 10 to 20 days, which requires high land cost and time cost for enterprises. Because it is treated by biochemical method, in different environments, the effect of treatment will not remain the same, so enterprises are required to have strict requirements for the closing of the discharge of sewage. Put an end to the discharge of substandard sewage to the national sewage station into the river to cause second pollution. This is also a drawback and uncontrollable aspect of this treatment.

At present, there are some small wineries in China to “upgrade” the biochemical treatment. After simple solid-liquid separation of distiller’s grains wastewater by centrifuge, the effective substances in the wastewater were enzymatically hydrolyzed (released) by adding bacteria microorganism, and then collected and sold as animal feed nutrition additives by concentration, drying and other treatment methods. Although this method still needs to discharge the remaining sewage after biochemical treatment, it can bring certain economic effect to the enterprise after all. In the long run, this method is more favored by the enterprise. But also because of the complexity of enzymatic hydrolysis, as well as the singularity of bacteria, is doomed to use this “upgraded” biochemical treatment method can not maximize the value of distiller’s grains wastewater, and still need to biochemical treatment of the remaining wastewater, can not achieve 0 discharge. Whether from the management of enterprises or the monitoring of relevant state departments have higher requirements.

The above is small for everyone to bring the current domestic distiller’s grains wastewater treatment status. I hope it will help you. In the next issue, we will explain in detail the treatment methods of distiller’s grains wastewater in foreign countries, and will also share with you the treatment methods of distiller’s grains wastewater which can be discharged 0 in China at present.

When it comes to distiller’s grains, first understand what distiller’s grains are. distiller’s grains are the residue of rice, wheat, sorghum, corn and other grains after fermentation. Wine has always been an indispensable member at the table of our country, so there are many kinds of wine in our country, which corresponds to all kinds of distiller’s grains. The distiller’s grains in our country are generally divided into liquor grains, beer grains and alcohol grains.

The distiller’s distiller’s distiller’s distiller’s distiller’s distiller’s distiller’s distiller’s liquid “. The rice wine we often use in our lives (sometimes called sweet wine) is a kind of distiller’s grains. In addition to rich starch and a small amount of alcohol, wine contains a large number of proteins, amino acids, vitamins, nucleic acids, ribose and other trace elements. So distiller’s grains can be treated as feed or waste sources for animals and plants.

There are now three ways to treat distiller’s grains:

The first is the traditional wastewater biochemical treatment, using anaerobic and aerobic treatment of wastewater to the national discharge standards.

Because it is rich in protein and ribose, wine water becomes super high concentration organic wastewater. The BOD and COD concentration of the existing distiller’s grains wastewater in China is more than 1000 times higher than the discharge standard of our sewage. The BOD concentration of domestic sewage for an average of 100000 people a year is equivalent to the 7 day BOD value of a brewery with 500 m3/d of distiller’s grains wastewater per day. And the scale of 500 m3/d of distiller’s grains wastewater production in China can only be counted as a small brewery, such enterprises are numerous. Such a large amount of high-concentration wastewater can be discharged through a series of biochemical treatments Put standard, brought huge pressure and economic burden to enterprise. At present, anaerobic and aerobic traditional methods are widely used in domestic distilleries to treat distiller’s grains wastewater. The effect of this method is good, and it can generally meet the national secondary discharge standard after treatment, but because this method covers a large area, has more sludge, high operating cost and takes a long time (more than 14 days of single batch), it has been puzzling many small and medium-sized wineries.

The second is direct treatment, which sells distiller’s grains wastewater directly to local farmers or farms for livestock or fish and shrimp, or combines the feces of other animals to cultivate fly maggots and earthworms.

This method may seem very reasonable and environmentally friendly, but it has two disadvantages: one is that fresh wine dregs are fed directly to livestock, poor digestion and absorption, mildew and rotten wine dregs are easy to produce virus damage; the other is that fresh wine dregs have high water content, are difficult to transport, and are prone to spoilage. Third, farmers’ needs also change according to market changes, difficult to stabilize. The fourth is to cultivate fly maggots and earthworms, but because of the long production cycle, it is necessary to build large feeding and processing plants to meet the requirements.

The third is resource reuse, that is, distiller’s grains wastewater is treated by a series of processes (including solid-liquid separation, concentration, biochemistry, drying, fermentation enzymatic hydrolysis, etc.) to achieve zero discharge. The separated and concentrated solids can be processed into feed or fertilizer. The third method is the most environmentally friendly and contributes the most to the society, but at the same time, because of the complexity of the process, the investment cost relative to the technical threshold and equipment is relatively high, which is more suitable for medium and large wineries or centralized processing stations.

The third method can be subdivided into two types: one is physical method, the other is biological method. The physical method is to supply energy to dry the distiller’s grains and distiller’s grains wastewater after solid-liquid separation, to realize zero discharge, to solve the environmental protection problem completely, and then to combine the two after drying into feed or feed additive. The finished product of this method has high yield and good feed value, but the operating cost of equipment investment and energy consumption is very high, so it is difficult to popularize in China. The other is the use of (single / more) microorganisms to ferment or enzymatic hydrolysis of distiller’s grains waste liquid, extract high protein substances, and then make them into feed.