Printing and dyeing wastewater treatment equipment is a combination of glass steel or carbon steel anticorrosive treatment components. The equipment is equipped with underwater aeration, which is promoted by water flow to form a dual function aeration. During the treatment of sewage, the sewage flows from the top of the device into the aeration area, the aerator is aerated underwater and pushes the flow to stir the sewage. The entered sewage is quickly fully mixed with the original mixed liquid to maximize the change in the quality of the incoming water. The aerator uses the dual functions of water flow promotion and underwater aeration to make the sewage in the aeration area circulate regularly and increase the dissolved oxygen content in the sewage. Due to the continuous circulation of sewage in the aeration area, the water quality at each point in the area is relatively uniform, and the number and nature of microorganisms are basically the same. Therefore, the working conditions of each part of the aeration area are almost the same. This keeps the entire biochemical reaction under the same good conditions. Organic matter is gradually degraded by microorganisms, and sewage is purified. Sewage produced by printing and dyeing is relatively complicated, and it is a type of industrial sewage with a large amount of change. The following editors introduce the issues that need attention in the use of printing and dyeing wastewater treatment equipment. A common problem in the treatment of printing and dyeing wastewater is that the amount of aerobic microorganisms in the biochemical treatment is too small, and the amount of flocculant is not well controlled. In order to achieve the desired effect in the treatment of printing and dyeing wastewater, it is necessary to pay attention to reducing the amount of wastewater from dyeing and washing as much as possible from the dyeing and finishing process. The second is to pay attention to the drainage discharge of printing and dyeing wastewater. The amount of production water used in dyeing and finishing is in, but it is not the polluted sewage that is discharged. Therefore, the diversion of printing and dyeing sewage is adopted. The severely polluted sewage is discharged after being treated by the sewage station, and the lightly polluted sewage is discharged directly or sent to a suitable place for reuse after simple treatment.
Printing and dyeing wastewater treatment equipment is mainly aimed at printing and dyeing wastewater with high chromaticity and difficult to decolorize, and high COD is difficult to reduce design and research and development. The following editors will introduce you to the installation foundation of printing and dyeing wastewater treatment equipment.
1. Foundation: If the printing and dyeing wastewater treatment equipment is placed above the floor, only a concrete floor with the same shape as the equipment needs to be prepared as the foundation. The foundation bearing pressure must be greater than 4T / m2, and at the same time, it is required to be level and level. If the equipment is buried below the ground, the elevation of the foundation must be less than or equal to the elevation of the equipment and ensure that it does not accumulate water when raining. The foundation is generally plain concrete (whether reinforcement is based on local geological conditions).
2. Installation: According to the installation drawing, the position and direction of the box cannot be misplaced, and then connect with the water inlet pipe. Inject clean water into the equipment before use, and check for leaks in all pipes. If not, cover the box with soil until the equipment inspection holes and level the ground. Connect the control box of the electric control box to the water pump and the electric control box to the power supply. When wiring, pay attention to the direction of the fan and the motor, which must be in the same direction as the fan.
Printing and dyeing wastewater treatment technology can be summarized into three major categories, namely physical method, chemical method, and biological method, and each type is divided into several technical units. Coagulation sedimentation and air flotation have a good one-time effect on the treatment of hydrophobic dye wastewater such as sulfurization, dispersion, reduction, and ice dyeing. The COD removal rate is 50% -70%, the chroma removal is 70% -80%, and the acidity, cations, etc. Soluble dyes can be added to the sewage by adding highly dispersed inorganic adsorbents (such as Pengrun soil, etc.) to adsorb air flotation. Anaerobic biological treatment is mostly degradable to different degrees such as direct dyes, reactive dyes, acid dyes, cationic dyes, etc. At the same time, the results of anaerobic test hydraulic retention time 3d and 8h are not much different, indicating that the anaerobic process It is carried out in the initial stage (hydrolysis stage).