It is good to enhance the biodegradability of industrial wastewater.
Many factories will have very difficult industrial wastewater, which has the characteristics of high organic matter concentration, poor biodegradability, and complex composition, which affect the limitations of the biological treatment methods used. So, how can we help factories solve the industrial wastewater problem?Catalytic oxidation is a very mature wastewater treatment method, in addition to having a good COD removal rate, it can also enhance the biodegradability of industrial wastewater. Therefore, it is widely used in the pretreatment stage and advanced treatment stage in the treatment projects of chemical wastewater, pharmaceutical wastewater, printing and dyeing wastewater.
For example, a printing and dyeing wastewater is treated by Fenton oxidation method, and the agent for synthesizing Fenton oxidant is relatively cheap, with Feso4·7H2O and H2O2, through the two substances under acidic conditions, the oxidizing ability of ·OH radicals is generated, and then the organic matter in the printing and dyeing wastewater is degraded, and there is a certain flocculation effect to remove the suspended matter in the wastewater.
Due to the limitations of the Fenton oxidation method, such as the long time consuming, the need for acid-base adjustment, and a lot of secondary pollution, it has been criticized by many enterprises. Subsequently, many Fenton-like oxidation methods have been developed, and other methods have been used to reduce the cost of chemical dosage and achieve better wastewater treatment results.
If you like it, like, follow, favorite. Liyuan Environmental Protection will share more wastewater treatment cases and knowledge.
In addition to this traditional and mature catalytic oxidation method, many catalytic oxidation methods have been studied, such as photocatalytic oxidation, ultrasonic oxidation, ultra-limited water oxidation technology, wet oxidation technology and so on.
The catalyst of photocatalytic oxidation is a semiconductor material, including oxides (such as TiO2, Zno and WO3, etc.) and sulfides (such as CDS, Zns, etc.), the principle is to add an appropriate amount of catalyst to the solution to be treated, under the irradiation of ultraviolet rays, to produce light radicals, but also to use the strong oxidation of light radicals to treat organic pollutants.
There are few application cases of this method, because it has the disadvantages of high preparation cost of catalyst, low light use efficiency, and the possibility of producing intermediate products with greater toxins, and the difficulty of catalyst**.
As more and more factories discharge high concentrations of refractory organic wastewater, we need a mature and reliable wastewater treatment process to solve the problem, not only relying on catalytic oxidation, but also other wastewater treatment methods to meet the discharge standards and reduce the cost of wastewater treatment.