The purpose of mechanical drum sieves is to remove solid and water insoluble impurities from the wastewater.
Wastewater is pumped into the automatic drum sieve, which separate the total suspended insoluble solids; the portion of effluents separated from solid inclusions flows into the buffer tank. Depending on industry field or wastewater type, mechanical sieves vary from horizontal to vertical position of drum filters. The drum filter mesh size shall be chosen depending on one’s requirements, keeping in mind the type, volume and pollution density of wastewaters.
Mechanical drum sieves are an integral part of a complex technological process of any kind of industrial or municipal wastewater treatment plants.
Operating principle of rotary filter (sieve) for wastewater treatment form suspended matter originated in terms of technological processes.
Equipment layout: rotary filter (sieve) for initial separation of (suspended) solids from the effluents, screw conveyor for separated suspended matter, dewatering screw press for solids, electronic control system for the listed equipment.
1. Operating principle of rotary sieve with external influx
Image 1. Drum sieve with conveyor and dewatering screw press
Image 2. Dewatering screw press for solids
The application of this component ensures dewatering of filtered sludge up to 26-30 % of filter cake dry matter contents and thus having portable granular dried sludge contrary to non-dewatered.
Image 3. Rotary filter management system
Based on a customer’s desire, system can be equipped with either automatic or manual control.
In case of automatic control, the sieve, screw conveyor and dewatering screw press are managed by a controller, which receives data from the flow sensor in sieve receivers and controls the operation of automatic flushing valves.
Processor * electronic water supplying valve for washing * receiving chamber flow sensor * frequency converter * drum sieve * press drive engine * press level laser sensor.
As a result, the sieve sets in motion when the required level of waste is reached in receiving chamber. If the wastewater level in receiving chamber steadily continues to increase while at the first rotary speed of the drum, it switches to the second (higher) speed automatically. The system shall automatically wash the drum after a certain amount of time. Thus, the washer valve shall open automatically after a certain operational time. When receiving chamber is filled up to a fixed level, dewatering press sets in motion and operates until the receiving chamber is empty, taking into account the additional time for emptying itself.