Printing and dyeing wastewater treatment of different pre-treatment analysis – p
Textile-dyeing wastewater has a large amount of water with high organic pollutant content, alkaline, water quality changes in major characteristics, is a tricky one industrial wastewater, wastewater containing dyes, sizing, additives, oil, acid alkali, fiber impurities, sand substances, salts, etc.. Currently used for Dyeing Wastewater Treatment The main methods of physicochemical, biochemical, chemical and several technology integration approach. The pretreatment of wastewater treatment is mainly to improve the water quality, removal of suspended solids and sedimentation of the impurities can be directly regulate water quality and quantity of waste water, reducing water temperature and improve the overall effectiveness of wastewater treatment to ensure the stability of the entire treatment system Therefore, in printing and dyeing wastewater pretreatment has an extremely important position.
Currently used for the pretreatment of dyeing wastewater treatment process are: grid, screen, grit chamber, regulation of water and water quality, temperature and so on. Depending on the water quality of printing and dyeing wastewater using different pretreatment to remove part of the pollutants, improve water quality, improve follow-up processing unit of treatment effect.
1. Grilles, screen As printing and dyeing waste water contains a lot of wool cloth, thread, fiber dust and other small suspended solids, flown by weaving back scouring and bleaching wastewater, rinse water all carry some intrinsic cowboy a lot of small fiber suspensions, mixed printing and dyeing wastewater often also contain a number of relatively large suspended matter and water, these substances would Pump Damage to the main treatment implications. Therefore, enter the pump and the main structures to intercept prior to their set suspended solids larger grille block, set the screen to intercept small suspended particles.
A, grill Grid is generally used in large amount, and the water is quite complex printing and dyeing wastewater treatment, such as tons or more textile industrial park wastewater treatment, because the large quantity of such waste water, and suspended solid particles larger Only set the grid can effectively intercept the larger suspended solids, increased processing power, and clogging. For printing and dyeing wastewater characteristics, our company set up in engineering practice is not only rough grid, but also used for the gate 1 ~ 5mm slit gap of fine grid. Grill machine mainly rotary mechanical grating machine, net-transfer chain grill machine, fixed grill machine, rotary tangential fine grid machines.
B, screen Screen is usually used in relatively small amount of water, waste water contains a lot of small suspended particles in wastewater treatment, such as: wool fabric, thread, etc., but also can remove large particles of pumice slag, on the suspended solids and large particles material removal rate could reach 90%. Engineering practice shows that the screen is generally 30 to 60 mesh, install the form of a fixed installation, the installation angle of 30 ~ 45 °. Perspective is not easy to install too large, too large it will cause excessive water load reduction, capacity reduction, while increasing part of the investment; too small screen is easy to cause blockage, increased the difficulty of cleaning residue affect the treatment effect.
2. Spigot Dyeing wastewater rinse water (such as denim rinse water) contains large amounts of sediment substances such as pumice slag, if you do not grit their wastewater treatment, follow-up structures often result in a large number of sand, would also reduce the follow-up treatment tank pool capacity, reduce the hydraulic retention time to allow the hydraulic characteristics can not meet the design requirements, resulting in serious impact on wastewater treatment efficiency, in particular, will cause pump wear, reduced pump life and increase operating costs. Therefore, in some printing and dyeing wastewater treatment set grit is necessary. Grit chamber generally divided into: advection grit chamber, grit chamber, vortex grit chamber. Our company is the most widely advection grit chamber, mainly due to the pumice denim rinse water surface without a lot of organic residue, so no need to use grit chamber or vortex grit chamber, grit chamber operation by advection Simple, easy operation and management.
In the grit chamber design process, the water quality characteristics of the rinse water had a full analysis of the characteristics of fine sediment particles, grit chamber can be divided into two to three grit, this will enable the sediment particles by class step by step the number of settlement, and ultimately achieving the purpose of removing sediment.
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