Automation Equipment for Wastewater Treatment Plant
- Delivery and commissioning
- Flowmeters
- Oximeters and level sensors
- Pressure/Vacuum gauge and manometers
Automation Equipment for Wastewater Treatment Plant
Commissioning is a complex of tasks performed in the period leading up to the start-up of treatment facilities, and includes individual tests of the equipment.
During commissioning, the workability of individual units and treatment facilities in general is checked. As well, the pump, blower and other equipment are adjusted to determine the optimal mode of operation.
Bioxica uses the following equipment for tuning wastewater treatment facilities:
- the pressure - vacuum gauge, the pressure in the manifold compressors;
- manometers, pressure line flushing pump;
- the flowmeters at the outlet of the installation to control the volume of the water;
- float sensors, sewage pumping stations;
- oximeters, in containers are used to measure temperature and concentration of oxygen dissolved in water.
All these devices predict the sewage treatment process as well as adjust process conditions.
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At each stage of wastewater treatment, flow must be controlled. This sets the operating modes of equipment and controls the amount of reagent.
To measure influent, flowmeters are used. One type used in Bioks by Bioxica is an ultrasonic flowmeter with proven reliability.
Ultrasonic flowmeter with contact sensor AKRON-01 stationary.
Electronic unit with LCD display.
Primary transducer with ultrasonic transducers fixed on the tube.
The flowmeter AKRON-01 with LCD display, where the following information is displayed:
- the current measured values:
- the volume of flowing fluid (m3);
- instantaneous flow rate (m3/h);
- flow rate;
- total time of recording;
- date and time;
- the contents of the archive;
- hourly – 2500 entries (over 100 days).
This flowmeter is used to measure flow rate and volume in sonically conductive liquids with a low content of gaseous inclusions in pressure pipelines.
The device measures the time difference between the ultrasonic wave upstream and the downstream controlled liquid based on the instantaneous flow.
The device includes an electronic unit and a transducer-coupled RF cable. The primary transducer consists of two ultrasonic transducers and devices for attaching them to the pipe. The transducer is mounted on the outer surface, and the straight pipe section is kept clean of dirt, rust and paint.
The most important factor when setting up wastewater treatment plants and their constituent sewage pumping station (SPS) is the temperature and the presence of oxygen in the tanks and the ability to adjust the level of wastewater at which the pumps of SPS are switched on and off. This provides automation of wastewater supply to treatment facilities.
To control these factors, oximeters and level sensors are used.
Oximeters
Oximeter “Expert-001”
Oximeter- oxygen analyzer Mark 404
The oximeter is designed to measure temperature and dissolved oxygen concentration in wastewater. It is a compact portable analyzer with a modular design.
Structurally, oximeters are composed of the display unit and a measuring device. The measuring device consists of a measuring probe and an electronic unit which is designed to process the signals from the temperature and oxygen sensors.
The board of the electronic unit is located inside the housing and is matched up with the board display through the connector. The probe consists of a body and an oxygen sensor, which is protected by a perforated packing and a cable. Temperature sensor and temperature compensation elements of the oxygen sensor are located inside the body of the probe.
Level sensors.
The SPS automation system is executed on the controller and provides automatic operation. The automation system checks the wear of pumps, changing their priority to working or backup after each start. When the working pump is stopped, the alarm signal is turned on and the automation turns on the backup pump. At accidental wastewater discharge (working pump doesn’t reduce liquid level inside the housing of SPS), the automation system connects the back-up pump and alarm signal in parallel. This mode of operation will continue until the lower level sensor is triggered. The sensors are suspended in the SPS at the correct height by their own cable. The distance between the sensors must be at least 20 cm apart. Most often the float level sensors are used for this purpose.
Float level sensor ЕММ-10
A microswitch, which is protected by a smooth coating of polypropylene resistant to most corrosive liquids, is used in the level sensor EMM-10. The level control is executed in different versions depending on the environment.
Pressure/vacuum gauges and manometers are important both during commissioning and operation of wastewater treatment plants.
No matter the model of blower, a pressure/vacuum gauge must be installed. It measures the productivity and efficiency of the blower, and alerts the operator to the need to adjust the air supply to the aeration tanks.
Pressure/vacuum gauge
A pressure/vacuum gauge is a device which measures both the vacuum and gauge pressure. The device has a scale, with both positive (absolute) and negative values (vacuum-gauge).
Manometer
The pumps used in wastewater treatment plants are equipped with manometers. They serve primarily to prevent emergencies. For example, the pressure in the pipes, which is determined with manometers, must correspond with the technical requirements. If the pressure level is not controlled, it can break the pipe. Manometers used at wastewater treatment plants must meet strict requirements. Their most important quality is accuracy, as even a very small error may cause a serious accident or a violation of the required process. In addition, they must be resistant to adverse environmental factors and be protected from the effects of high and low temperatures, high pressure, and corrosion.
Materials of pressure/vacuum gauges and manometers’ details:
Housing - steel.
Glass - cast.
Tube spring - copper alloy, iron-nickel alloy.
Holder: copper alloy.
Machine: copper alloy.
