Print

Processing capacity of sludge dewatering decanter centrifuge

on . Posted in News

There are two important factors that will affect the processing capacity of sludge dewatering decanter centrifuge and the  consumption of flocculant during the sewage treatment: sludge properties and sludge concentration. When the sludge property changes greatly, it is necessary to adjust the applicable flocculant in time to match the sludge dewatering operation; when the sludge concentration changes, it is necessary to adjust the flocculant supply flow in a timely manner, so that it can meet the treatment effect and Prevent wastage.

     The specific method is to often observe the mud effect, and then appropriately reduce the supply flow of the flocculant working fluid. You can reduce the frequency of the flocculant dosing pump every time by about 0.5-1.0Hz, and observe the mud cake and supernatant status and torque data after a few minutes , According to the situation, decide whether to continue to reduce the dosing pump frequency until the most economical dosing pump operating frequency is found. Or you can increase the frequency of the mud pump about 0.5-1.0Hz each time to observe and adjust. Conversely, when the sludge concentration increases, the adjustment is made in the opposite direction.

In addition, the decanter centrifuge structure determines the high requirements for the quality of the mud feed. There should not be a large amount of large-sized particulate and fibrous material in the mud feed, otherwise it will easily cause equipment clogging, increased vibration, and affect the treatment efficiency. Therefore, the sludge must be crushed and filtered before entering the centrifuge.

Any sludege dewatering decanter centrifuge has a maximum processing capacity requirement. This requirement has two aspects of data reference guidance:

A. The maximum load of dry solids that can be processed is the maximum weight of non-volatile solids processed per hour, expressed in KGDS (dry solids) / h;

B. The maximum treatable hydraulic load, that is, the sludge flow into the equipment, is expressed in m3 / h, and the product of the sludge concentration (solid content) is the dry solid load.

      Under the condition of normal sludge concentration, it should be ensured that the maximum treatment dry solid load is 70% -90% of the theoretical load set by the equipment factory trademark. It is necessary to avoid the equipment utilization rate being too low, or the equipment loss caused by long-term operation under high load. Speed ​​up and shorten the maintenance cycle. In the case of excessive equipment load, any increase in the amount of flocculant will not improve the treatment effect. It is manifested as unsatisfactory mud biscuits. The supernatant carries high solids and the recovery rate decreases. Sediment overflow causes equipment wear, dynamic balance damage and increased vibration. Sometimes, due to the increase in sludge concentration, when the sludge is fed according to the original flow rate, the actual sludge load exceeds the acceptable load index of the equipment, and the treatment effect decreases. At this time, it is necessary to gradually reduce the frequency of mud feed and observe the effect. After the effect is stabilized, continue to try to control the flow rate of the flocculant to the most economical dosage. Conversely, when the concentration of sludge decreases, the flow of sludge should be gradually increased, and the flow rate of the dosing pump should be adjusted at the same time. If the concentration of influent sludge is too low, although the dry solid load of the equipment is not high, the hydraulic load is very large. Under the high hydraulic load, the incoming low-concentration sludge cannot form a mud ring layer of uniform thickness, and the settled solids will be heavily The supernatant carries overflow, which directly affects the treatment effect and treatment efficiency.