Analysis of aluminum sulfate in waste water treatment in the use of chemical

In most small and medium sized production and processing plant and sewage treatment plant is the most applied chemical precipitation wastewater treatment , wastewater coagulation treatment, waste PVC stabilizer  water treatment and waste water and oxidation treatment . Wastewater chemical treatment including wastewater ozonation treatment , waste water electrolysis treatment , waste water treatment chemical precipitation , coagulation wastewater treatment , waste water treatment and waste water oxidation and treatment method. The chemistry of aluminum sulfate in wastewater treatment and in what kind of role does occur , it is also how to play that role yet.
In the role of the water chemical treatment
 Aluminum sulfate in water chemistry, most of the time based coagulants appear . It contains varying amounts of crystal water : Al2 (SO4) 3.18 H2O where n = 6,10,14,16,8 and 27 , commonly used is Al2 (SO4) 3.18 H2O molecular weight of 666.41 , the proportion of 1.61 , the appearance of white , shiny crystals . Aluminum sulfate soluble in water , acidic aqueous solution at room temperature solubility is roughly 50%? PH value of 2.5 or Stearates  less. Solubility in boiling water to 90 % or more. Aluminum sulfate ease of use , better coagulation treated water will not give an adverse effect . When the water temperature is low aluminum sulfate hydrolysis difficult floc looser .
Chemical treatment of wastewater in the role operations
  Aluminum sulfate most commonly used in our country mostly use massive or granular aluminum sulfate . According to one water-insoluble substance content and crude purification can be divided Pigments  into two kinds. Soluble in water can be dry or wet dosing . Wet dosing has generally adopted a concentration of 10-20% ( by weight of solid product ) . Efficient water use narrow pH range ? Between about 5.5-8 , with the pH value of the effective hardness of the water content of the original varies , pH of 5.7-6.6 for the water softener . Medium hardness water 6.6 - 7.2 . High hardness of the water was 7.2-7.8 . Aluminum sulfate in the control dose should be considered in the above-mentioned characteristics . Sometimes adding excess water pH dropped to make aluminum coagulation pH value less effective drug not only a waste , but also so that the treated water, mix .
The above said is aluminum sulfate as a coagulant chemical in waste water treatment in the use . In fact, it is also a neutralizing agent , of course , with lime , compared to the composite base , which in the waste water used alone as a pH adjusting agent , very little can be said to apply .