Horizontal screw pushing sedimentation centrifuge is referred to as horizontal screw centrifuge, which has been widely used in sludge dewatering treatment of sewage treatment plant. Although different manufacturers of different specifications or models of horizontal screw centrifuges have different equipment structure, equipment material, specifications and operation adjustment mechanism, but

Its basic equipment principle is similar, now carries on the brief introduction to it, in order to facilitate the field user to use and adjust better.

The horizontal screw centrifuge is mainly composed of drum, spiral, differential system, liquid level baffle, drive system and control system.

The horizontal screw centrifuge uses the density difference of solid-liquid two-phase to the settling speed of solid particles under the action of centrifugal force to realize solid-liquid separation. The process of separation is that the sludge and flocculant solution are fed into the mixing chamber through the inlet pipe, where the mixed flocculation is carried out (if the sludge pump is added before or after the pump, the flocculation reaction is advanced). The sludge is accelerated and formed a cylindrical liquid ring layer (liquid ring area) inside the rotor due to the high speed rotation and friction resistance of the rotor (spiral and drum). Under the action of centrifugal force, the specific gravity solid particles settle to the inner wall of the drum to form a mud layer (solid ring layer), and then use the screw and drum to form a mud layer (solid ring layer). The The relative velocity difference of the drum pushes the solid phase to the cone end of the drum. After the liquid level is pushed out (shore area or dry area), the mud slag can be dehydrated and dried, and the supernatant is discharged from the large end of the drum to realize the separation of solid and liquid.

The effect of the mechanical part of the horizontal screw centrifuge is divided into adjustable factors and non-adjustable factors. It can be effectively controlled in use.

Settlement is the centrifuge drum installed at the upper end of the shaft, through the transmission driven by the motor and high-speed rotation. There is a set of disc parts in the drum, the disc. There is a small gap between the disc and the disc. The suspension is attended by a feeding tube located in the center of the drum. When the suspension passes through the gap between the discs, the solid particles sink to the disc by centrifuge to form sediment.

The sediment slips along the surface of the disc and leaves the disc and accumulates in the largest diameter of the drum. The separated liquid is discharged from the outlet. The function of the disc is to shorten the settling interval of solid particles and expand the settling area of the drum, which greatly improves the production capacity of the separator because of the installation of the disc. The solid accumulated in the drum is removed by manual removal after the separator stops, or discharged from the drum without stopping.

There are the following points in the settlement centrifuge, which is different from the filter centrifuge:

The settling centrifuge equipment is turned into a closed barrel. The working principle of the equipment is to separate the solid-liquid two-phase through centrifugal force. The centrifuge of this method is called the settling centrifuge. The sedimentation centrifuge is suitable for a wide range of materials, such as high viscosity of materials and small solid particles, which can meet the requirements of solid-liquid two-phase separation by increasing centrifugal force.

Filter centrifuge equipment drum hole, additional filter media through the method of blocking solid-liquid two-phase separation centrifuge we call filter centrifuge, Filter centrifuge is suitable for small viscosity of materials, solid particles are not easy to deform (such as crystal) solid particles large and small batch production conditions, mostly used for industrial dehydration.

The sedimentation centrifuge can complete two kinds of operations: liquid-solid separation, called clarification operation; liquid-liquid separation, called separation operation. Disc separator is widely used in chemical industry, medicine, light industry, food, bioengineering and transportation because of its compact structure, small area and large producti

What is the price of oily sludge treatment technology equipment? Because the oily sludge composition in each area is different, the solution is different. The price is also different, now our country attaches great importance to environmental protection, decades ago buried oily sludge has also been dug to solve, this kind of oily sludge solution is not the same, the price is not the same. General oily sludge treatment technology equipment manufacturers to solve a ton of oily sludge in 200-300 yuan. In the second half of this year, more and more companies intervene in oily sludge solution, and the price relativity is also reduced.

Technical methods are generally as follows:

1. Automatic feeding: The single bucket sludge bucket lifting machine with unique design scheme is used to consider the transportation of liquid, solid and semi-solid oily sludge, and then the oily sludge is sent immediately from the oily sludge tank to the moving pretreatment equipment to consider continuous feeding. And the bucket lift machine raw material entrance place sets up the junior middle school level pick miscellaneous net slot, can avoid the ribbon, the stick and so on block dirty matter enters the solution system software.
2. Pretreatment: Oily Sludge in Oily Sludge Treatment Technical Equipment According to the interaction between Sludge Sorting Runner and Grate Plate, the sludge of block coalescer is scattered according to the rotation of Sludge Sorting Runner, and more than 20 mm of sludge is pushed into the bulk raw material collection box on one side of the pretreatment equipment by the Sorting Runner. Sludge less than 20 mm is sifted into the sludge pretreatment tank according to the round hole of the Sorting grate plate. According to the mutual effect of oily sludge sorting runner and grate plate, the sludge removal, chemical fiber crushing, symmetrical dispersion, oil slurry storage and transportation are completed.
3. Cleaning: In the oily sludge level II level III cleaning equipment. According to the efficacy of medicine, ultrasonic wave, air floatation machine, mixing and so on, the oily sludge is collected, cleaned and dispersed oil is removed.
4. Solid-liquid separation equipment: high-efficiency environmental protection and energy-saving pig manure dehydrator to complete the separation of solid sludge and liquid.
5. Water and oil solution: oil-bearing sludge treatment technology equipment manufacturers according to the three-level cleaning equipment collected floating oil to the oil storage tank, oil storage tank for precipitation of water can be transported to the storage tank. According to the liquid extracted by high efficiency, environmental protection and energy saving pig manure dehydrator into the water storage tank, the floating oil in the water storage tank can be collected and typed into the oil storage tank, and the boiling water can be reused as a return water.

Scraper centrifuge is a continuous operation, intermittent operation of filter centrifuge, its control mode is automatic control, but also manual control. the feeding, separation, washing, dehydration, unloading and filter cloth regeneration processes during the operation of the centrifuge are generally completed at full speed. the single cycle time is short capacity is large, and the dry filter slag and good washing effect can be obtained.

Is a continuous operation, intermittent operation of the filter centrifuge, its control mode for automatic control, but also manual control. the feeding, separation, washing, dehydration, unloading and filter cloth regeneration processes during the operation of the centrifuge are generally completed at full speed. the single cycle time is short capacity is large, and the dry filter slag and good washing effect can be obtained.

I. Working principles

The main working principle of centrifuge is to produce centrifugal force to realize solid-liquid separation, which is composed of feed, washing, liquid discharge and so on.

II. Preparation before boot

1. Open the door cover and check for screw loosening, especially spindle.

2. hydraulic station oil level should be station should be more than 2/3 of the oil standard thermometer label YB-N46.

The main pressure working pressure of 3. gas control box should be more than 4㎏, the explosion-proof pneumatic valve (feeding valve, cleaning valve) can be opened reliably, and the cylinder pressure of material level detection is 2.5~4㎏.

III. Boot

1. Before boot, make sure the cover is closed and all screws are tightened.

2. first press the feeding speed button, after the speed (speed read from the tachometer) arrived, press the feeding speed on / off, the feeding indicator light.

3. open the feed valve, start feeding at this time, when the material is full, the feeding indicator lights out.

4. if the machine vibration is small, can open separation speed, if the vibration is large, open cleaning speed, and pay attention to observation, if the vibration is serious, please reduce to the feeding speed.

5. according to the properties of the separation material, nitrogen gas should be filled if necessary to prevent the separation and scraping of.

6. depending on the production process, determine the separation time, after the separation, press the scraping speed button.

• After the reaches the scraper, press the discharge button.

8. scraper, scraper rotation > scraper drop > scraper rise, scraper rotation two > scraper drop > scraper rise, scraper reset, scraper end.

9. when feeding and discharging, the operator shall not leave the post. When feeding, mainly observe the vibration of the machine, outlet, discharge, discharge, mainly check whether the outlet is blocked, motor speed is normal. 10. When the machine is running normally, if there are no special circumstances, please do not press the emergency stop button, especially when running at high speed; if pressed, all the work of the equipment will stop.

IV. Automatic operation (selection function)

1. After manual normal, input the relevant data into the man-machine interface (select accessories).

• If an exception occurs during 2. operation, cut back to manual operation until troubleshooting.
• Fault handling method is similar to manual.
• If the vibration is too large in 4. operation, the machine will stop automatically and cut back to manual processing.

V. Shutdown inspection

1. the opening cover must wait for the centrifuge to stop completely, confirm that the screw and hook have been unloaded, the material level detection limit switch indicator light can be opened, can press the open cover button, when the cover and drum 95 degrees, insert the safety pin. If not, check the compressed air pressure to ensure that the level detection plate is not in the position to open the door cover safely. Similarly, the probe board should not be in the probe position when closing the cover.

2. If want to work in the machine, press the emergency stop button after opening the cover.

3. centrifuge running speed is high, rotation inertia is large, operators must always pay attention to safety, to ensure the safety of personnel and equipment.

4. Clean and replace the filter cloth before work or as appropriate, clean up the material above the hopper, material exploration, etc., and remove the material from the liquid outlet.

5. to check the drum weld, fence, shell parts corrosion, timely reporting.

The main function of centrifuge separator equipment is to remove insoluble matter from fluid, whether solid or liquid. This problem comes, a lot of heavy metal pollution ions are soluble, how to do this? GN discusses with you how precipitator flocculant these sewage treatment agents in the horizontal centrifuge solid-liquid separation process how to cooperate and how to choose.

The precipitator reacts to the chemical characteristics of free ions to form insoluble precipitates. The flocculant aggregates the very small solid suspended matter together to form a large particle size polymer. The pretreatment of the fluid facilitates the solid-liquid separation operation of the decanter centrifuge. Combined use of sewage treatment agents such as precipitators and flocculants, the aggregation and deposition of solid particles and the removal of some dissolved organic matter simplify the operation, save the cost, make the removal of pollutants in wastewater treatment more thorough, more efficient, more complete and lower cost.

In order to achieve a good effect of sewage treatment, the selection of chemicals in the treatment of sewage by decanter centrifuge should be specially analyzed for the physical and chemical properties of sewage, and the distribution of sewage ions, the properties of colloid and suspended matter and the concentration of selected agents should be determined. If the pollutants in water are colloidal, inorganic flocculant is the first choice to make the pollutants metastable and condensed. If the floc is small, it is necessary to add polymer flocculant or to use activated silica gel and other coagulants.

Sometimes in-depth analysis of material characteristics will bring unexpected surprises, according to the charge principle of the same sex repulsive phase absorption, The use of negatively charged flocculants to complex positive charge suspended particles with twice the result with half the effort. It is more suitable for positively charged flocculants to capture the particles with very small negative charge in sewage. Of course, to determine whether the charge properties of pollutant particles are the best partners of horizontal centrifuge, sampling and computer experiments are essential.

In the treatment of horizontal centrifuge, the choice of flocculant precipitator is best determined by sampling experiment, and the sewage sample is determined by the test centrifuge equipment, and then the best proportion of the reagent is confirmed by fine adjustment in production.

Treatment processes such as filtration and flotation are often used in wastewater treatment. By using inorganic flocculant and polyelectrolyte coagulant, the treatment capacity is greatly improved by extending the treatment range. Flocculant precipitator and other chemicals combined with the characteristics of wastewater water quality, flocculant can be used alone, or a variety of flocculant compound use or one main and one auxiliary compound use (auxiliary as coagulant aid). In many cases, the combined use of inorganic flocculant and polymer flocculant can obviously improve the coagulation effect and extend the application range of separation and processing of decanter centrifuge.

What is the oil sludge separation equipment? It mainly refers to a kind of high-tech equipment which can separate solid and liquid phases in silt. Industry commonly known as lying snail centrifuge.

I. OVERVIEW

oil sludge separation equipment is a horizontal spiral discharge, continuous operation of settling equipment.

The working principle of this kind of separator is as follows: the drum and screw rotate at the same speed at a certain differential speed, the material is continuously introduced into the inner cylinder of the feed tube, then accelerated into the drum, and under the action of centrifugal force field, Heavy solid matter is deposited on the drum wall to form sediment layer. The solid phase deposited by the feed screw is continuously pushed to the end of the drum cone and discharged through the slag outlet. The lighter liquid phase forms an inner liquid ring, which is continuously overflowed from the overflow port of the large end of the drum and discharged from the machine through the outlet. This machine can feed, separate, wash and unload continuously at full speed. Compact structure, continuous operation, smooth operation, strong adaptability, production Large capacity, convenient maintenance and other characteristics. suitable for separating suspensions with solid-containing particle size greater than 0.005 mm, concentration range of 2-40%. Widely used in chemical, light industry, pharmaceutical, food, environmental protection and other industries.

II. Working Principles

The suspension enters the oil sludge separation equipment from the feed pipe. Under the high speed rotation of the drum, the specific gravity solid is thrown to the drum wall, and the light gravity liquid is squeezed to the center of the drum. Under the action of the differential speed of the screw and the drum, the solid deposited on the drum wall is pushed by the screw conveyer to the small end of the drum outlet, and the liquid is discharged through the large end of the drum overflow hole.

III. Selection

Choosing suitable oil sludge separation equipment can not only solve the problem of oil sludge separation and improve working efficiency, but also save production cost and reduce operating risk. The main factors affecting selection are as follows:

The speed of oil sludge separation equipment: the general oil sludge separation equipment should be above 3000 rpm, the higher the speed, the higher the separation factor of oil sludge separation equipment, the better the separation effect.

Different materials have different physical and chemical indexes, such as wear resistance, corrosion resistance and so on. The lowest material of oil sludge separation equipment abroad is 316 L, or duplex stainless steel, and ceramic synthetic material should be used for components.

Centrifuge differential control: different differential control accuracy is different, and the difference between life and maintenance cost is very large, the higher the differential accuracy, the better the adaptability to the material, so the equipment with high differential precision should be selected.

Length-diameter ratio: the larger the length-diameter ratio of oil sludge separation equipment, the greater the treatment capacity and the smaller the moisture content.

Control system: whether it is automatic programming control, at present, domestic and foreign equipment manufacturers have basically realized the automatic control of the equipment.

Installation power: affecting the control of energy consumption, general domestic equipment energy consumption ratio is high, foreign energy consumption ratio is low.

Processing technology: oil sludge separation equipment belongs to the separation equipment with high precision processing requirements. The product maintenance rate is high and the processing capacity is limited.

This is a brief introduction to the oil sludge separation equipment.

Disc centrifuge separator is a kind of settling centrifuge and a more precise branch of centrifuge equipment. It adopts centrifugal separation principle to design separation performance, which is superior to that of industrial production fluid separation. In addition, disc centrifuge can not only automatically control continuous operation, but also automatically discharge slag.

Common difficult to separate fluid materials, such as colloidal fluids consisting of viscous liquids and fine solid particles or emulsions with very small specific gravity differences, Because the specific gravity of the components in the fluid is very small or the physical characteristics of viscosity are very difficult to separate, this is the time for disc centrifuges to show off.

Disc centrifuge separators are widely used in laboratory, animal and plant protein separation, oil extraction and refining, biochemical pharmaceutical extraction and other operations. Disc centrifuge separators are commonly used in the following industries:

1. Petrochemical oil separation industry: disc centrifuge is often used for marine turbine, diesel engine, power station and other petrochemical fuel and lubricating oil separation and purification;

2. dairy separation and purification industry: disc centrifuge is often used to clarify and purify fresh milk, degreasing, cheese;

3. purification of vegetable oil industry: disc centrifuge is often used for purification and clarification of vegetable oil hair oil, degumming, soap removal, dehydration and dewaxing in vegetable oil refining;

4. beverage industry: beer, beverage, juice and other semi-finished beverage clarification, plant protein extraction, treatment of wastewater produced in production;

5. starch processing industry: starch pulp concentration and grading;

6. pharmaceutical industry: disc centrifuge is often used in biopharmaceutical antibiotics, biochemical pharmaceutical drug extraction purification and concentration, the clarification of traditional Chinese medicine extraction and purification;

7. chemical raw material manufacturing industry: disc centrifuge is often used to purify or clarify chemical raw materials;

8. lanolin industry: extraction and purification of lanolin from wool washing wastewater;

9. latex production industry: purification and concentration of natural rubber latex pulp;

10. Biofermentation: Disc centrifuges are often used to clarify bioengineered fermentation broths, concentrate, extract, liquid-solid, liquid-liquid-solid separation.

The above mentioned content is about a disc centrifuge separator performance and application scope in a simple way. if you are interested in this product, please contact us for detailed information. We have been exploring in the separation field for more than 10 years with ample experience and reference cases. We hope our products will be a great help to your project.

(3) Wet cracking method

The recovery of black liquor from rice straw pulp by wet cracking method is a new technology in China. the black liquor was wet cracked at about 20 MPa,360 c for 15~30 min,. the organic matter in the black liquor was converted into gas, tar, carbon powder and organic acid, and sodium silicate was converted into Si2 precipitation at high CO2 partial pressure. Then the cracking product is separated by sedimentation method under normal pressure, and the separated liquid can be causticized to recover alkali.

(4) SCA- comparison

The basic principle of this method is similar to that of air oxidation method. The black liquid concentrated to 50~60% was separated by instant heat in the thermal decomposition furnace under the condition of insufficient oxygen. The decomposition product was Na2CO3、H2S、C.

(5) Integrated Black Liquid Utilization

Recovery of sulfate turpentine, preparation of humic acid ammonia with black liquor, recovery of tarot oil, preparation of dimethyl alum with black liquor, etc. In addition, lignin can be recovered to produce alcohol and yeast.

2. Pulping Machine Waste Water Recycling

The waste water discharged by pulp beating machine contains the same composition as black liquid, but the concentration is low. Due to the small amount of organic substances (fibers and bases, etc.) contained, it is difficult to recover, but the total solids, suspended matter and BOD5 in the wastewater are still very high, and the direct discharge is still very serious for water pollution, so it needs to be treated. and the main treatment methods include coagulation sedimentation, air floatation, activated sludge, stabilization pond, biofilter and A/O.

3. Paper Machine Wastewater Recycling

The waste water discharged from the paper machine contains a large amount of fiber, if it is not recycled, it will cause a great waste. Therefore, the waste water of the paper machine must be fully recovered and reused. These water parts can be used to dilute pulp (such as white water discharged by case Kun), partly to be used in beating engineering (water absorption tank and waste water pressed by Fu Kun), and waste water that can not be used in beating engineering should be sent to the recovery device for feed recovery.

GN has been working in the waste water treatment industry for more than a decade. We are always doing our best to meet customers’ requirements and designing the most fit product for our clients’ project. In waste water treatment, we are professional. If you have any questions, please feel free to contact our sales team.

I. Sources and characteristics of papermaking wastewater

There is a lot of water in the process of paper making. It takes about 300~500 m3, to produce 1 paper. In paper wastewater, it not only contains a large number of raw materials (about 20% of raw materials are lost with wastewater), but also contains a lot of chemicals and other impurities.

For the limited treatment of papermaking wastewater. First of all, we must understand the water quality of papermaking wastewater. There are three kinds of wastewater from alkaline papermaking:

1. cooking wood pulp (or straw pulp) generated waste liquid, also known as black liquid.

2. beating machine and pulping machine discharged wastewater, called beating wastewater.

3. paper machine wastewater, which can be directly used called white water.

The main pollutants contained in these wastewater are as follows:

1. suspended

Includes collapsible and non-collapsible suspensions, mainly fibers and fine fibers (i.e. broken fiber fragments and miscellaneous cells)

2. biodegradable organic compounds

Including low molecular weight hemicellulose, methanol, acetic acid, formic acid, sugar and so on.

3. refractory organic matter

It mainly comes from lignin and macromolecular carbohydrates in fiber raw materials.

4. toxic substances

Black liquor contains rosin acid and unsaturated fatty acids and so on.

5. acid-base poisons

The ph value of alkali pulping wastewater is 9~10, and that of acid pulping wastewater is 1.2~2.0.

6. chroma

The residual lignin in pulping wastewater is highly colored.

II. Recycling of papermaking wastewater

Because papermaking wastewater consists of three kinds of wastewater: black liquid, pulping machine wastewater and papermaking machine wastewater, its recovery and utilization is mainly aimed at these three kinds of wastewater.

1. black liquor recycling

 (1) Traditional alkali recovery (combustion)

The paper industry uses a large amount of alkali, each production of 1 t pulp needs 200~400 kg caustic soda. About 35% of the black liquor discharged after cooking is inorganic, the main components of which are free NaOH、Na2S、Na2SO4 and other sodium salts combined with organic matter. The purpose of alkali recovery is to convert these sodium salts into NaOH and Na2S recycling to reduce costs and reduce pollution to water bodies.

(2) Wet oxidation

Wet air oxidation refers to the process in which organic matter in wastewater is oxidized and decomposed at high temperature and high pressure, the degree of oxidation depends on the temperature and pressure used. This method is suitable for caustic soda black liquor.

In recent years, with the rapid growth of the food industry, the waste water discharged by it greatly pollutes the environment, and loses a lot of energy and water resources, which in turn restricts its own growth. Due to the severe lack of resources in the face of the world at this stage, it is urgent to choose the appropriate waste water disposal punishment to achieve the goal of water saving and energy saving.

The important source of sewage in food industry is the process of food processing, such as punishment, washing, dehydration, filtration, dispersing and refining, deacidification, deodorization and cooking. Sewage contains a large amount of egg white, organic acids and carbohydrates. Due to the existence of many plankton, dissolved organic matter in water grows rapidly, and humus is easy to occur and accompanied by unpleasant gas. At the same time, copper, lead, manganese, chromium and other metal ions other metal ions in these sewage, and bacteria and coliform bacteria often exceed the national discharge scale.

The important pollutants in wastewater are (1) solid substances, such as vegetable leaves, pericarp, minced meat and poultry feathers, etc .;(2) oil, egg white, starch, colloid, etc .;(3) acid, alkali, salt, sugar, etc. dissolved in wastewater :(4) mud sand and other organic matter entrained by qualitative materials ;(5) pathogenic bacteria, etc. Food industry wastewater is characterized by high organic matter and suspended matter content, easy to erosion, the same usually no toxicity. Its harm is to make the water body eutrophication, so as to cause aquatic animals and fish to die, promote the accumulation of organic matter under the water odor, deterioration of water quality pollute the environment.

Since there are many kinds of food, there are many kinds of material springs, the sewage of food industry has the characteristics of suspended matter, high oil content, heavy metal ions, large COD and BOD value, large range of water quality and quantity change, high content of nitrogen and phosphorus compounds, and high water temperature in some environments. Therefore, the punishment of sewage disposal in food industry is usually to accept solid-liquid dispersion skills to remove suspended matter and drifters from sewage to reach the sewage discharge scale.

Solid-liquid dispersion skills we accept Zhejiang Sanlian environmental protection machine equipment deployment Co., Ltd. LW spiral discharge settling machine. It is important to be used in the field of solid and liquid dispersion in all living wastewater, industrial wastewater, chemical, food, pharmaceutical and similar production industries.

The process of wastewater from the food industry is as follows:

The suspension of wastewater in the food industry enters the drum through the feed pipe from the spiral outlet. Under the action of the centrifuge in which the high speed rotation takes place, the solid particles with large specific gravity are deposited on the inner wall of the drum. After dispersing the clear night through the liquid layer adjustment plate opening overflow and flow drum. The relative activity between the spiral body and the drum (that is, the differential speed) is realized by the differential, and its fineness is controlled by the auxiliary motor, thus realizing the continuous dispersion of the centrifuge to the material.

All kinds of waste water biological disposal punishment system is constantly emerging, the above-mentioned food wastewater is to accept the new solid-liquid dispersion skills, with high use rate, simple installation, wide application scope and other advantages, and has been put into practice in foreign countries, to achieve success. We can learn from the disposal and punishment skills of these ancestors, and trust that with the continuous strengthening of people’s awareness of environmental protection, the water environment of our country will certainly change.