1. Grille screen
Due to printing and dyeing wastewater contains a large number of cloth coat, thrum, lint and other tiny suspended solids, of weaving and flies back scouring and bleaching wastewater, jeans rinsing wastewater contains a large number of small fiber suspensions, mixed printing and dyeing wastewater often also contain many relatively large suspended substances, these substances will be on the pump damage influence the main processing, therefore before into the pump and the main structure of the intercept and setting grille interception larger suspended matters, set up a small suspended solids to intercept screen.
A. Grille
The grille is generally used in wastewater water water quality and more complex processing, such as wastewater for 10000 tons of textile printing and dyeing industrial park processing, because the waste water, and suspended particles larger set grille can effectively intercept larger suspended solids, high processing ability, is not easy to be blocked, according to the characteristics of our company does not set the printing and dyeing wastewater by the coarse grid in engineering practice, generally only use fine grid, grid gap usually adopts 1-5mm. grille machine is mainly a rotary machinery grille machine nets chain type rotary grid machine, fixed grid machine, Fanqie type rotating fine grille machine, our company are mainly used reverse rotary the fine grid net machine, rotary machine, fixed chain grille grille machine etc..
B. Screen mesh
Screens are commonly used in water is relatively small, wastewater containing a lot of fine suspended solids such as cloth coat, thread and other and large particles of pumice slag removal, of suspended solids and particulate matter removal rate can reach more than 90%. Engineering practice shows that the gap screen generally 30-60 mesh, installed in the form of the fixed installation, installation angle is 45 DEG, installation angle should not be too large, is caused by water load reduced, the processing capacity is reduced but also increase the investment, too small, easy to cause the mesh plug, increase the slag cleaning difficulty, influence the treatment effect.
2. Grit
Printing and dyeing wastewater of rinsing wastewater (such as jeans rinsing wastewater) containing a lot of mud and sand material such as slag pumice, if not the wastewater grit disposal, often caused by subsequent construction of a lot of blown sand, reduces the subsequent processing to build a pool of soluble, reduces the hydraulic retention time, the hydraulic properties can not meet the design requirements, serious impact on the efficiency of wastewater treatment, especially on the pump caused by wear and reduce the service life of the water pump, increases the operation cost. Therefore, in some printing and dyeing wastewater treatment is very necessary, grit chamber generally can be divided into: flat flow grit chamber, aeration grit chamber, cyclone grit chamber. Our company use the most is the horizontal flow grit chamber, is mainly due to the rinsing wastewater of cowboy slag pumice surface does not contain large amounts of organic matter, so there is no need to the aeration sink pool or swirl sink sand pool, by advective sink sand pool has the advantages of simple operation, management and operation convenient.
In sinking sand pool design process, of rinsing wastewater quality characteristics were full analysis, considering the characteristics of mud and sand particles, sinking sand pool can be divided into two three grit, this can make mud and sand particles by the series of progressive subsidence, and ultimately achieve the removal of mud and sand, and always stay can be designed for 1.5 hours, discharging sand gravity drainage sand and mechanical sand discharge, according to the actual situation of the project determine sand
