May 23

Analysis of actual difference between belt press machine and decanter centrifuge

1 Applicable media problems

Decanter centrifuge is suitable for all kinds of sludge; belt machine is also suitable for all kinds of sludge, but for oily, viscous, remaining activated sludge, it needs a large amount of medicine and dehydration is difficult.

2 The problem of feed control

The decanter centrifuge can automatically adjust the slip and torque according to the change of the feed concentration, and the belt machine must be manually adjusted.

3 Problems of solid recovery rate and dosage

The solid recovery rate of the centrifuge is indeed higher than that of the belt machine, but this does not mean that the solid recovery rate of the belt machine cannot be used if it is low. In fact, the belt filter must be returned to the front and reprocessed.

The dosage of medicament is added. A 15 × 104t / d urban sewage treatment plant designed by the author adopts a decanter centrifuge for dehydration. The measured consumption of PAM per ton of dry sludge after production is 1.7-2.0kg. The lower the consumption of medicine with machine (PAM) is generally 4kg / (t [dry mud]).

4 Power consumption problem

The difference in power consumption is not as claimed by the manufacturer of the machine. It is actually controversial. The decanter centrifuge manufacturers will also say that their centrifuges use less electricity. The author speaks a jargon here: power consumption differs mainly depending on the model and the amount of processing capacity.

The noise of the centrifuge is large, but the noise with the machine is not the machine itself, mainly the sound of washing water, the sound feels better than the centrifuge;

5 The life of the belt press machine

The bearing life of a good-quality belt press machine is theoretically 20a, which is similar to the life of the host machine. The filter belt needs to be replaced frequently. The filter belt is generally replaced continuously for 2000h operation. If it is intermittently operated and maintained well, then it depends on the length of use and shutdown In contrast, regardless of whether it is a domestic or imported belt machine, the filter belt can generally be replaced with a domestic filter belt, so the cost of replacing the filter belt is not high, and the current domestic equipment of the decanter centrifuge is reliable, stable, and easy to maintain and maintain.

In theory, the running time of the belt press machine can also run for 24 hours. Of course, the continuous operation of the belt machine is not as reliable as the centrifuge.

6 Calculation of operating expenses

When the belt filter press dehydration machine manufacturer calculates the dehydration and centrifuge core operating costs, there are many problems in the calculation method used. The operating costs mainly include: pharmaceutical fees, electricity costs and water costs. In addition to the belt machine, there are downtime costs and flushing costs. The author took an 8 × 104t / d sewage treatment plant as an example to calculate the actual operating cost of sludge treatment. Therefore, from the perspective of operating costs, the use of centrifuges and Not higher than with the machine.

7 Investment issues

From the perspective of investment, if the above-mentioned belt integrated machine is an imported high-end product, the full set is about 200,000 US dollars, and the domestic production is lower, while the above set of centrifugal concentration dehydration machine is about 300,000 US dollars, and the domestic production is lower, due to the difference in product grades. Or other specific reasons, the price will be outstanding, but generally speaking, the product of the same grade, the price of the centrifuge is higher than that with the filter, however, because the centrifuge occupies less space, the construction cost of the sludge concentration and dewatering room can be saved In some cases, the two basically offset each other, which means that the investment costs of the belt machine and the centrifuge are similar.

From the above analysis, we can draw the following conclusions: The advantage of the centrifuge is that the mud is dry and the closed environment is good. It can run continuously without flushing water. The advantages of the belt machine are power saving and low noise. Therefore, whether to use centrifuge or belt machine for sludge (concentration) dehydration must be analyzed concretely.

written by Decanter Centrifuge


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