What is the role of dissolved oxygen in sewage treatment?
What is dissolved oxygen? What is the relationship between dissolved oxygen and microorganisms?
Oxygen dissolved in water is called dissolved oxygen. The organisms and aerobic microorganisms in the water body rely on dissolved oxygen for their survival. Different microorganisms have different requirements for dissolved oxygen. Aerobic microorganisms need to supply sufficient dissolved oxygen. Generally speaking, dissolved oxygen should be maintained at 3mg/L, and the minimum should not be lower than 2mg/L; facultative microorganisms require dissolved oxygen in the range of 0.2-2.0mg/L while anaerobic microorganisms require the range of dissolved oxygen to be below 0.2mg/L.
What does dissolved oxygen (DO) mean?
Dissolved oxygen (DO) represents the amount of dissolved oxygen in water, expressed in mg/L. Different biochemical treatment methods have different requirements for dissolved oxygen. In the facultative biochemical process, the dissolved oxygen in water is generally between 0.2-2.0mg/L, while in the SBR aerobic biochemical process, the dissolved oxygen in water is generally between Between 2.0-8.0mg/L. Therefore, the aeration volume and aeration time should be small and the aeration time should be short when the facultative tank is operated; while the aeration volume and aeration time are much larger and much longer when the SBR aerobic tank is operated, and we use the contact Oxidation, dissolved oxygen is controlled at 2.0-4.0mg/L.
What factors are related to the content of dissolved oxygen in wastewater?
The concentration of dissolved oxygen in water can be expressed by Henry's law: when the dissolution equilibrium is reached: C=KH*P
Among them: C is the solubility of oxygen in water at the dissolution equilibrium; P is the partial pressure of oxygen in the gas phase; KH is the Henry coefficient, which is related to temperature; increase aeration to make the dissolution of oxygen close to equilibrium, and at the same time, activated sludge will consume water of oxygen. Therefore, the actual amount of dissolved oxygen in wastewater is related to water temperature, effective water depth (affecting pressure), aeration rate, sludge concentration, salinity and other factors.
Who provides the oxygen needed by microorganisms in the biochemical process?
The oxygen required by microorganisms in the biochemical process is mainly provided by the aeration device.
How to accurately measure the dissolved oxygen value?
Use a dissolved oxygen meter for real-time online monitoring.
What kind of dissolved oxygen meter can accurately and real-time feedback the dissolved oxygen content in sewage treatment?
Fluorescent dissolved oxygen is more suitable for sewage treatment, because it will not be interfered by other ions in sewage, does not consume oxygen, is not limited by flow rate, does not require frequent calibration, low maintenance, longer service life, and can be monitored online for a long time.
What are the advantages of cloud-based IoT fluorescence dissolved oxygen sensor?
1) Master the core technology, unique and leading fluorescent materials, sensitive response and more accurate measurement.
2) It has its own machining center and CNC machine tools.
3) There is a team of experts from Germany.
