Sewage treatment equipment

Sewage treatment equipment Product Description   Sewage treatment equipment:A decanter centrifuge separates solids from one or two liquid phases in one single continuous process. This is done using centrifugal forces that can be well beyond 3000 times greater than gravity.   Sewage treatment equipment::It consists of a solid cylindirical bowl rotating at high speed, a scroll rotating at the same axis with a slightly different speed, a drive group adjusting the speed difference and the body which carries all the rotating elements.   Sewage treatment equipment: Liquid and suspended solids are fed along the centre line to a distribution room within the bowl and then accelerated into the bowl by centrifugal force through the feeding point. This centrifugal force then causes the suspended solids to settle and accumulate at the bowl wall. Sludge cake is discharged by scroll from the conical part meanwhile clarified liquid flows back along the bowl and is discharged through the cylindirical end of the bowl by plates which can adjust the level of clarified liquid.   A decanter centrifuge is a device, which employs a high rotational speed to separate components of different densities. This becomes relevant in the majority of industrial jobs where solids, liquids and gases are merged into a single mixture and the separation of these different phases is necessary. A decanter centrifuge separates solid materials from liquids in slurry and therefore plays an important role in wastewater treatment, chemical, oil and food processing industries. There are several factors that affect the performance of a decanter centrifuge and some design heuristics to be followed which are dependent upon given applications.   The operating principle of a decanter centrifuge is based on gravitational separation. Naturally, a component with a higher density would fall to the bottom of a mixture, while the less dense component would be suspended above it. A decanter centrifuge increases the rate of settling through the use of continuous rotation, producing a gravitational force between 1000 to 4000 times that of normal gravitational force. This reduces the settling time of the components by a large magnitude, whereby mixtures previously having to take hours to settle can be settled in a matter of seconds using a decanter centrifuge. This form of separation enables more rapid and controllable results   The main application of decanter centrifuges is to separate large amounts of solids from liquids on a continuous basis. They are also used to wash and dry various solids in industry, such as polystyrene beads, clarify liquids and concentrate solids. Table 1.0 displays various examples of the utilisation of decanter centrifuges in various industries.   Generally the decanter centrifuge has more advantages than disadvantages; however there are some limitations when compared to other processes. Advantages: 1.Decanter centrifuges have a clean appearance and have little to no odour problems. 2.Not only is the device easy to install and fast at starting up and shutting down, but also only requires a small area for operation compared to other competitive processes. 3.The decanter centrifuge is versatile as different lengths of the cylindrical bowl section and the cone angle can be selected for different applications. Also the system can be pre-programmed with various design curves to predict the sludge type, while some competitive processes, such as a belt filter press, cannot change the belt type to operate for different sludge types.Its versatility allows the machine to have various functions such as operating for thickening or dewatering. The machine can operate with a higher throughput capacity than smaller machines.This also reduces the number of units required. 4.The device is simple to optimise and operate as it has few major variables and reliable feedback information. 5.The decanter centrifuge has reduced labour costs compared to other processes, as it requires low continuous maintenance and operator attention. 6.Compared to some competitive process such as the belt filter process, the decanter centrifuge has more process flexibility and higher levels of performance. Limitations: 1.The decanter centrifuge cannot separate biological solids with very small density differences, such as cells and viruses.A competitive process that is capable of separating these difficult-to-separate solids is the tubular-bowl centrifuge. 2.The machine can be very noisy and can cause vibration. 3.The device has a high-energy consumption due to high G-forces. 4.The decanter centrifuge has high equipment capital costs. Hard surfacing and abrasion protection materials are required for the scroll to reduce wear and therefore reduce the maintenance of the scroll wear.   The main types of decanter centrifuges are the vertical orientation, horizontal orientation and Conveyor or Scroll. In vertical decanter centrifuges the rotating assembly is mounted vertically with its weight supported by a single bearing at the bottom or suspended from the top.The gearbox and bowl are suspended from the drive head, which is connected to the frame.The vertical decanter allows for high temperature or high-pressure operation due to the orientation and the rotational seals provided at one end. However, this makes the device more expensive than the horizontal decanter centrifuge, which is non-pressurised and open. The advantage of the vertical machine over the horizontal machine is that the noise emitted during production is much lower due to less vibration. In horizontal decanter centrifuges, as shown in figure 1, the rotating assembly is mounted horizontally with bearings on each end to a rigid frame, which provides a good sealing surface for high-pressure applications.The feed enters through one end of the bearings, while the gearbox is attached to the other end and is operated below critical speed.Capacities range up to 40,000 pounds (18,000 kg) of solids per hour with liquid feed rates of up to 300 US gallons (1.1 m3) per minute. The horizontal machine is arranged in a way that slurry can be introduced at the centre of a rotating horizontal cylindrical bowl. The scroll discharge screw forces the solids to one end of the bowl as it is collected on the walls. This orientation is the most common design implemented in industry.    

Model	Diameter of the drum(mm)	Length of the drum(mm)	Speed rotation of the drum(Rpm)	Separation factor	Capacity(m3/h)	Mainmotorpower(KW)	Auxiliarymotorpower(KW)	Outlinedimension(mm)	machineweight(kg)	Formationofdifferentialmechanism
LW250*900	250	900	5400	4000	1-5	11	4	1800*1200*600	1050	planet gear
LW360*1200	360	1200	4200	3550	3-12	15	7.5	2600*1580*1040	2100	Planet gear
LW360*1500	360	1500	4200	3550	3-14	22	7.5	2900*1600*1040	2600	Planet gear
LW420*1750	420	1750	4000	3750	6-30	37/45	7.5/11	3120*1580*1070	3500	Planet gear
LW420*2100	420	2100	4000	3750	6-35	45	11/18.5	3450*1580*1070	4100	Planet gear
LW500*2000	500	2000	3800	4000	10-40	45/55	11/18.5	3600*2300*1400	6500	Planet gear
LW500*2500	500	2500	3800	4000	12-45	55/75	15/18.5	4100*2300*1400	7200	Planet gear
LW550*1900	550	1900	3200	3154	13-50	45/55	15	3400*1810*1110	4600	Planet gear
LW550*2400	550	2400	3200	3154	13-55	55/75	18.5	3900*1810*110	5600	Planet gear
LW650*2000	650	2000	2650	2500	15-65	55/75	18.5	4000*2300*1400	7100	Planet gear
LW450*1800	450	1800	4000	4028	10-35	45	18.5	4400*1350*1460	4200	Planet gear
LW450*2100	450	2100	4000	4028	10-40	45	18.5	4700*1350*1460	4600	Planet gear
LW500*2200	500	2200	3800	4039	15-45	55	22	4400*1400*1480	5000	Planet gear
LW500*2550	500	2550	3800	4039	15-45	75	22	4700*1400*1480	5500	Planet gear
LW550*2200	550	2200	3200	3151	18-55	55	22	4500*1500*1500	5300	Planet gear
LW550*2600	550	2600	3200	3151	18-60	75	22	5000*1500*1500	7500	Planet gear
LW650*2200	650	2200	2650	2553	20-65	75	22	4700*650*1650	7600	Planet gear
LW650*2600	650	2600	2650	2553	20-70	90	37	5100*1650*1650	9100	Planet gear
LW720*2000	720	2000	2540	2600	25-75	90	37	4700*1730*1750	11000	Planet gear
LW720*2500	720	2500	2540	2600	25-80	132	37	5200*1730*1750	12800	Planet gear
LW800*2000	800	2000	2000	1790	35-100	132	45	4750*1800*1830	14000	Planet gear
LW1000*2000	1000	2000	1800	1812	40-120	250	45	4800*2000*2000	17800	Planet gear