sensor to measure Sewage

Modern sewage treatment technology can be divided into primary, secondary and tertiary treatment processes according to the degree of treatment.
In the process of sewage biological treatment, there are certain requirements for sewage quality, water temperature, dissolved oxygen in water, pH value, etc. As an important device for measuring water body data, various water quality sensors provide technical support for water pollution control and water safety in the process of sewage treatment.
1. Dissolved oxygen sensor
Too high dissolved oxygen (greater than 4mg/L) will accelerate the consumption of organic substances in sewage, and cause the aging of activated sludge and the proliferation of filamentous bacteria due to lack of nutrients in microorganisms. Long-term high dissolved oxygen will reduce the flocculation performance and adsorption capacity of activated sludge.
If the dissolved oxygen is too low (less than 1.5mg/L), the life activities of microorganisms will be inhibited, resulting in the decay, disintegration and deterioration of microorganisms; it will affect the respiration of microorganisms and the purification ability of activated sludge, and the sludge will float and decay until swell.
2. PH sensor
The pH value will affect the charge of the microbial cell membrane in the activated sludge of sewage treatment, thereby affecting the activity of enzymes in the process of nutrient absorption and metabolism by microorganisms; changing the availability of nutrients in the growth environment and the toxicity of harmful substances.
3. ORP sensor
ORP is the difference between the redox potential of the indicator electrode and the redox potential of the comparison electrode in the liquid, which can give a comprehensive indicator of the redox state of the entire system.
*If the ORP value is low, it indicates that the content of reducing substances or organic pollutants in the wastewater treatment system is high, the concentration of dissolved oxygen is low, and the reducing environment is dominant.
*If the ORP value is high, it indicates that the concentration of organic pollutants in the wastewater is low, the concentration of dissolved oxygen or oxidizing substances is high, and the oxidizing environment is dominant.
ORP is an important direction for the development of automatic control technology and anaerobic precise control in sewage treatment plants, which is of great significance for saving energy, controlling the metabolic pathways of anaerobic microorganisms and improving the treatment effect.
4. Ammonia nitrogen sensor
Ammonia nitrogen in wastewater refers to nitrogen in the form of free ammonia and ionized ammonium, mainly from the decomposition of nitrogen-containing organic matter in domestic sewage, industrial wastewater such as coking and synthetic ammonia, and farmland drainage.
Due to the oxidation of NH4+-N, the concentration of dissolved oxygen in the water body will decrease, resulting in the water body turning black and smelly, and the water quality declining, which will affect the survival of aquatic animals and plants.
5. Residual chlorine sensor
Residual chlorine means that after chlorine is put into water, in addition to consuming a part of the chlorine amount by interacting with bacteria, microorganisms, organic matter, inorganic matter, etc. in the water, there is still a part of the chlorine amount left. Chlorine-containing disinfectants generally refer to disinfectants that dissolve in water to produce hypochlorous acid with microbicidal activity.
The high residual chlorine content is easy to kill biological activity, affecting the normal operation of the sewage biochemical treatment unit, and the poor sewage treatment effect will lead to the risk of exceeding the standard of effluent quality.