Pretreatment of waste water precedes regular treatment through filters when necessary. It may include one or more of the following processes:
a. Screening 
b. Plain sedimentation 
c. Aeration 
d. Chemical dosing and mixing 
e. Coagulation followed by flocculation 
f. Sedimentation 
g. Pre-chlorination at the appropriate stages.
Some physical and chemical factors and the presence of toxic substances may make pretreatment of water essential. Treatment of potable water depends on many needs such as:
a. Aesthetic reasons, such as 'the removal of taste, odor, color and turbidity'. 
b. Economic reasons like 'softening for minimizing laundry costs'. 
c. Industrial needs including 'the preparation of boiler feed water'. 
d. Recreational needs like filling a swimming pool. 
e. Occasionally for other purposes like, 'to reduce corrosiveness' or 'to combat fluorosis', etc.
Naturally available water cannot be readily used. It requires some treatment. Primarily, pathogenic organisms need to be removed for controlling water borne diseases and hence protect public health.
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Email: qilee@qileegroup.com
Contact person: Xia Miao
Add: Room 412, Xianglu Building, No. 3009, Gudai Road, Minhang District, Shanghai, China

If you are interested in Membrane Water Treatment Systems, please check our website at https://www.qileegroup.com for details.