SCHEMATIC DIAGRAM OF PRIMARY TREATMENT
The first stages of waste water ( sewage ) treatment are commonly physical and aimed to remove larger suspended solids from waste water, primarily using gravity to allow larger (heavy) particles to settle while allowing the remaining liquid to continue through the plant. Primary waste water treatment uses simple mechanical & physical processes to remove nearly half of the solid contaminants from waste water. Primary treatment consists of units like coarse screening, grit removal, communicator, flow equalization and primary sedimentation tanks. The schematic diagram of primary treatment with commonly used units.
COARSE SCREEN
The first step in primary treatment is coarse screening to remove large materials such as rags, logs, plastics and other large objects from the waste water that could damage or interfere with the treatment process and equipment. Coarse screens (also known as bar racks) are made up of vertical or inclined parallel bars of mild steel or stainless steel with openings 25 to 75 mm wide to enable waste water to pass through while large objects are caught on the bars . These screens are raked and cleaned from time to time. Some waste water treatment plants have automated equipment that cleans the screens automatically
Primary Treatment of Sewage Plant
In mechanical cleaning arrangement a horizontal rake on a toothed gear drive rakes the bars and removes the captured material to a conveyor that deposits the material into a dumpster for removal to the sanitary landfill. The Fig. shows the arrangement of mechanically cleaned bar screen. Mechanical cleaning arrangements are provided in larger capacity waste water treatment plants (> 20 MLD capacity). In smaller waste water treatment plants, the screens are manually raked.
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1.The first stages of waste water ( sewage ) treatment are commonly physical and aimed to remove larger suspended solids from waste water, primarily using gravity to allow larger (heavy) particles to settle while allowing the remaining liquid to continue through the plant.
2.Primary waste water treatment uses simple mechanical & physical processes to remove nearly half of the solid contaminants from waste water.
3.Primary treatment consists of units like coarse screening, grit removal, comminatory, flow equalization and primary sedimentation tanks. The schematic diagram of primary treatment with commonly used units.
For more Reference:
http://www.thewatertreatments.com/waste-water-treatment-filtration-purify-sepration-sewage/primary-water-treatment-sewage-treatment-waste
I think you will find that screening and grit chambers is all part of pre-treatment and not primary treatment. Primary treatment is coagulation flocculation sedimentation etc. Secondary being sand filters.
Very good site
hi i need to know preliminary water treatment units history, background, design, efficiency.
nice information. elaborate more on how each function works.
It helped when you mentioned that it is important to have a screening to make sure everything is fine. My uncle mentioned to me last night that they are hoping to find a service that can arrange a time for a septic tank installation for their home and asked if I have any idea what is the best option to do. Thanks to this informative article and I'll be sure to tell him that it will be much better if they consult a trusted wastewater treatment system service as they can answer all his inquiries and will provide good-quality service.