How to make the return water of the centrifugal dehydrator clear

How to make the backwater clear, first of all, don't look for the reason on the equipment, at least the reason on the equipment is secondary, mainly to see whether the selection of the agent is appropriate.

1. Molecular weight. If the molecular weight is too large, polyacrylamide encapsulates sludge particles, flocculation repels each other, flocculation effect is poor, and the effect of filtration or centrifugation is also poor.

Second, ionicism. The ionicity of cationic polyacrylamide is the charge density carried by the molecular chain of cationic polyacrylamide. The choice of cationic ionization often determines the sludge dewatering effect.

Different industries produce different sewage sludge, so the cationic polyacrylamide ionization used is also different. If the ions are too low, the sludge floc is not compact enough, and if the ions are too high, the sludge floc will have an excessive charge and be repulsed. For example, urban sewage should be high in organic matter, and the Rihui Environmental Protection Sample Laboratory and the Market Research Department have proved that high ionic polyacrylamide is often used, and the effect of 50 degrees and 60 degrees is better.

Paper mills can use 20 degrees and 30 degrees cationic polyacrylamide. In addition, the desliming equipment often has requirements for cationic polyacrylamide, generally speaking, the desliming centrifuge has slightly higher ionization requirements than the filter press.

The above are the most important factors affecting the use of Rihui polyacrylamide, and then which agent is more suitable through small tests. The small-scale test method is as follows: the selection of Rihui polyacrylamide model is generally for the sludge to be treated, which needs to be selected in the laboratory.

Polyacrylamide solutions with different molecular weights and ionic degrees are prepared in the laboratory, mixed with the treated sludge under the same conditions, and then the flocculation effect is observed, such as the size of the floc and the moisture content of the floc.

Hope the above is helpful to you!

Does it mean supernatant? The easiest way is to reduce the quick check, increase the liquid ring layer, and increase the rotational speed.

Centrifugal sludge dewatering machine has been widely used in sludge dewatering treatment in sewage treatment plants. Although different manufacturers of different specifications or models of centrifugal sludge dewatering machine have different equipment structure, equipment material, specifications and operation adjustment mechanism, etc., but its basic equipment principle is similar, it is now briefly introduced, so that on-site users can better use and adjust.

The centrifugal sludge dewatering machine is mainly composed of a rotating drum, a screw, a differential system, a liquid level baffle, a drive system and a control system.

The centrifugal sludge dewatering machine uses the density difference between the solid and liquid phases to accelerate the sedimentation speed of the solid particles under the action of centrifugal force to achieve solid-liquid separation. Due to the high-speed rotation and frictional resistance of the rotor (spiral and drum), the sludge is accelerated inside the rotor and forms a cylindrical liquid ring layer (liquid ring area), under the action of centrifugal force, the solid particles with a large specific gravity settle to the inner wall of the drum to form a mud layer (solid ring layer), Then use the relative speed difference between the spiral and the drum to push the solid phase to the cone end of the drum, and after the liquid level is pushed out (shore area or dry area), the sludge can be dehydrated and dried, pushed to the slag discharge port for discharge, and the supernatant is discharged from the large end of the drum to achieve solid-liquid separation.

The working principle, product introduction, product type, product characteristics, and scope of application of sludge dewatering machine.

Centrifugal dehydrator operation method:

1. Put the materials that need to be dehydrated evenly into the bean cube, pay attention to balance, uniformity and overload.

2. After about 90 seconds of starting the motor, the machine reaches normal operation, and the outlet pipe begins to discharge a large amount of water.

3. The machine runs for about 6-8 minutes, and the outlet pipe basically has no water outflow, so the power supply can be cut off, and after 1-2 minutes, slowly brake the opening and closing arm brakes in several times, and the machine stops.

4. Do not put materials in the process of machine operation, so as not to throw out the materials and hurt people and things by the high-speed rotating drum.

Centrifugal dehydrator daily work maintenance:

1. The operator must be familiar with the structure, performance and operation methods of the machine.

2. Before starting the machine, turn the bean to check the operation of the bean.

3. The feeding should be evenly distributed, so as not to cause excessive vibration of the machine due to excessive weight.

4. During normal operation, do not brake the opening and closing arm to avoid damage to the Lanling belt and other parts.

5. No items can be placed on the top cover to avoid accidents after starting.

6. Once an abnormal phenomenon is found during operation, the power supply should be cut off immediately, and the brake should be stopped for inspection.

7. The machine must be overhauled regularly, filled with lubricating oil, and overhauled at least once every six months.

Centrifugal dewatering equipment is a kind of washing equipment, which is a kind of equipment that adopts centrifugal methods such as inner cylinder rotation and throws out the water contained in the object through the centrifugal force generated by high-speed rotation.

For example, it is composed of a screw conveyor with a hollow shaft, and the sludge is fed into the drum by the hollow shaft, and is immediately thrown into the hub cavity under the action of centrifugal force generated by high-speed rotation. The specific gravity of sludge particles is large, so the centrifugal force generated is also large, and it is thrown on the inner wall of the rotor hub to form a solid layer; The water density is small, the centrifugal force is also small, and only the liquid layer is created on the inside of the solid layer.

Under the slow push of the screw conveyor, the sludge of the solid layer is transported to the cone end of the first class, and is continuously discharged through the outlet around the first place, and the liquid is discharged from the fourth overflow of the weir to the outside of the first place, and is discharged out of the dehydrator after collection.

Workflow. The sludge after conditioning the rubber plume is introduced into the fine screen of the screening and separation tank, and a large amount of upper liquid is filtered out after slow rotation and churning, so as to achieve the function of concentration and reduction, improve the processing energy of the machine and shorten the operation and processing time. The sludge thickener adopts the form of semi-centrifugal rotary filtration, and implements assembly line operations such as sludge feeding, dosing, mixing, reaction, and wet sludge output in the whole thickening and dewatering system. The process is as follows:

Thickening tank sludge sludge conditioning and stirring evenly Centrifugal water filtration screening and separation Thickened sludge enters the dewatering machine for further dewatering treatment.

I have a stacking dehydrator, which is more energy-efficient than the traditional centrifugal dehydrator, which consumes one-twentieth of the energy of the centrifuge, and I am not interested.

1. Foreign objects are wrapped around the bottom of the outer wall of the dehydration tank.

When the spinning bucket rotates at high speed, the small thing will throw the gap between the top of the swimming bucket and the end cover into the bottom of the outer wall of the dehydration bucket, and then tightly wrap it around the shaft between the bottom and the water seal, so that the motor cannot run and cause the dehydration to be unable to dehydrate.

2. Capacitor failure.

After the power supply of the washing machine, the motor of the dehydration bucket makes a "buzzing" sound without turning, at this time, you can unplug the power plug, check whether the capacitor is invalid, or replace it with a new product; If the motor starts running normally, the fault is on the capacitor.

3. The shaft sleeve and shaft of the dehydration motor are locked.

After the washing machine is energized and started, the shaft drives the shaft sleeve to form friction between the sleeve bowl and the sleeve tablet, which will make the dewatering bucket motor rotate slowly or cannot be started. At this time, the shaft failure needs to be taken out and repaired, and the fault can be eliminated after reassembly.

4. Dehydration motor failure.

Failures such as coil burnout and wire disconnection of the dehydration motor of the washing machine will cause it to fail to work properly. The damage of the motor coil is mainly due to moisture, mostly caused by the damage of the water sealing bowl or the serious wear of the shaft sleeve that causes water to leak into the motor coil. For this kind of fault, the water seal must be inspected, and if the water seal is found to be damaged or the water seal sleeve is seriously worn, it should be replaced one by one.