Nowadays, sewage treatment has been widely used in many fields such as environmental protection, urban landscape, and medical care, and the printing and dyeing industry is also one of them. With the continuous development of the textile industry, the discharge of dye wastewater has also increased sharply. At present, the amount of wastewater discharged from China's textile industry mainly comes from the printing and dyeing industry, and printing and dyeing wastewater is one of the difficulties in industrial wastewater treatment. These wastewater mainly come from processes such as bleaching, dyeing, desizing, and finishing. In addition to containing a large amount of pulp and additives, they also contain various toxic pollutants. In addition, printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, deep color, high alkalinity, and large changes in water quality, which increases the difficulty of its treatment.

How to treat printing and dyeing wastewater in a low consumption and efficient manner has always been a topic of continuous exploration and research in the industry. In this article, we will use a certain water treatment development company as an example to explain how to achieve low consumption, stable, and cost-effective sewage treatment effects through customized solutions. Starting from application requirements, a high standard technical solution is customized. The project adopts advanced sewage treatment equipment, and the main process of the factory area adopts A/O treatment process, which greatly improves the urban water environment and plays an important role in pollution control, protecting local watershed water quality and ecological balance.

In the process of sewage treatment, the stirring process is essential. It can quickly and evenly mix the added chemical reagents with the wastewater, promote collisions between fine particles, and gradually increase their size. In this way, the aggregated particles can be uniformly suspended in the liquid, preventing sedimentation in the flocculation tank. Thus improving the degree of uniform mixing and ensuring good processing results. Because the wastewater treatment plant operates 24 hours a day, wastewater is constantly generated during the operation process and needs to be treated in a timely manner. Once the equipment malfunctions, it may lead to shutdown and even have a huge impact on the environment. Therefore, the treatment of printing and dyeing wastewater requires very strict requirements for equipment reliability and failure rate, even zero failure rate. So, not only do we need to ensure the safety and reliability of the mixer, but we also need to be very strict when selecting components, such as the reduction motor. If the deceleration motor malfunctions, it will directly affect the mixing process, and in severe cases, it will affect the treatment capacity of the wastewater treatment plant, causing irreversible losses. From the perspective of gearbox selection, it needs to be tailored and highly matched with the mixer in order to solve the problem from the source. The special deceleration motor for mixing helps save 50% of electricity consumption. In addition to strict requirements for equipment stability and failure rate, this project also faces some special application environments, such as relatively harsh outdoor water treatment environments and the need to ensure 24-hour continuous operation every day. In addition, the stirring blade is subjected to axial forces of over 7000N and bending moments of 3500N. m, which places higher demands on the output shaft and bearings of the gearbox.

In response to the above situation, this project uses coaxial helical gear reducers, which can ensure continuous operation 24 hours a day. IE3 energy-saving can save electricity for users. These deceleration motors are also equipped with reinforced VL shafts and bearings specifically designed for mixing, which can withstand large radial and axial forces in working conditions. At the same time, with the help of professional verification software, the force situation can be analyzed and calculated to obtain the safety factor and bearing life of the shaft, ensuring the safety of the selection. In addition, Nord also provides RD rain covers suitable for outdoor vertical installation of gearboxes, which have the function of blocking rainwater. Its overall IP66 protection level and KB condensate drain hole can provide protection for harsh working conditions on site. It can not only drain the water entering the motor from the drain hole, but also maintain normal operation within 0-40 degrees Celsius, thus ensuring safe and effective uninterrupted operation of the equipment.