Powdered carbon backflow and carbon/sand filter combined process for treating polluted water

Abstract

The invention discloses a powdered carbon backflow and carbon / sand filter combined process for treating polluted water, which belongs to the field of water treatment. A device comprises a mixing tank, a flocculating tank, a settling pond and a carbon / sand filter which are connected in series in turn, wherein powdered active carbon and a coagulant are added in raw water to be treated, and the raw water is mixed with the coagulant in the mixing tank; the mixed raw water enters the flocculating tank to undergo a flocculation reaction and then enters the settling pond to undergo solid-liquid separation, active carbon mud settled in the settling pond is concentrated in a mud storage chamber and flows back to the mixing tank or flocculating tank by a reflux pump, the concentrated active carbon mud flows back to the mixing tank when the coagulant is added and flows back to the flocculating tank when the coagulant is not added; and water after the settlement enters the carbon / sand filter, thegranular active carbon is filled on the upper layer of the carbon / sand filter, and quartz sand is filled in the lower layer. In the invention, a powdered carbon backflow process is adopted, so that over 50 percent of medicinal preparation can be saved; and the physical absorption effect, biological degradation effect and strengthening coagulation effect of the active carbon act in coordination, and the carbon / sand dual-layer filter has the physical absorption and biological degradation effects at the same time.

Description

technical field

[0001] The invention belongs to the field of water treatment, and in particular relates to a short-flow advanced treatment process for treating polluted source water, in particular to a combined process of powdered carbon backflow and carbon sand filter tank for treating polluted water. Background technique

[0002] At present, there are micro-pollution problems in drinking water sources in most areas of my country, especially in frequent outbreaks of water source water seasonal and sudden pollution incidents, trace organic matter, ammonia nitrogen and smell and taste problems seriously threaten the hygiene and safety of drinking water for local residents . my country's new "Drinking Water Sanitation Standard" (GB5749-2006) has been promulgated and implemented on July 1, 2007, and has put forward specific requirements for organic matter, ammonia nitrogen, especially smell and taste. However, the traditional conventional water treatment process has limited rem...

Examples

Embodiment 1

[0028] In this embodiment, the turbidity of the raw water to be treated is 4.62NTU, and the UV 254 0.0374cm -1 , ammonia nitrogen 2.907mg / L, pH value 7.6-8.0, water temperature 20-24°C, GSM 267.25ng / L, 2-MIB 274.87ng / L. Using the process of the present invention, the mechanical mixing tank, mechanical flocculation tank, inclined tube sedimentation tank, carbon / sand double-layer filter and powder carbon reflux process are combined, and powdered activated carbon and polyaluminum chloride are continuously added to the raw water. The dosage of aluminum is 15mg / L, the dosage of powdered activated carbon is 5mg / L, the hydraulic retention time of the mixing tank is 1min, and the G value is controlled at 800s -1 ;The hydraulic retention time of the flocculation tank is 15min, and the average G value is controlled at 50s -1 ; After sinking, the activated carbon mud flows back to the flocculation tank, the reflux ratio is controlled at 10%, and the mud age is 5 days; the thickness of ...

Embodiment 2

[0030] In this embodiment, the turbidity of the raw water to be treated is 4.02NTU, and the UV 254 0.0354cm -1, ammonia nitrogen 3.008mg / L, pH value 7.9, water temperature 19-24°C, GSM 257.45ng / L, 2-MIB 284.37ng / L. By adopting the process of the present invention, the mechanical mixing tank, the clapboard flocculation tank, the inclined tube sedimentation tank, the carbon / sand double-layer filter tank and the powder carbon reflux process are combined, and the powdered activated carbon, aluminum sulfate and coagulant aid are continuously added to the mixing tank. Acrylamide, the dosage of aluminum sulfate is 20mg / L, the dosage of powdered activated carbon is 6.0mg / L, the dosage of polyacrylamide is 0.1mg / L, the hydraulic retention time of the mixing tank is 0.5min, and the G value is controlled at 1000s -1 ; The hydraulic retention time of the flocculation tank is 20min, and the average G value is controlled at 30s -1 After sinking, the activated carbon mud flows back to the ...

Embodiment 3

[0032] In this embodiment, the turbidity of the raw water to be treated is 6.00NTU, and the UV 254 0.0256cm -1 , ammonia nitrogen 2.645mg / L, pH value 7.6, water temperature 20-22°C, GSM 242.06ng / L, 2-MIB 268.22ng / L. By adopting the process of the present invention, the mechanical mixing tank, the clapboard flocculation tank, the inclined tube sedimentation tank, the carbon / sand double-layer filter tank and the powder carbon reflux process are combined, and powdered activated carbon and polyaluminum chloride are continuously added to the mixing tank. The dosage of aluminum chloride is 20mg / L, the dosage of powdered activated carbon is 6.0mg / L, the hydraulic retention time of the mixing tank is 0.5min, and the G value is controlled at 900s -1 ; The hydraulic retention time of the flocculation tank is 18min, and the average G value is controlled at 20s -1 After sinking, the activated carbon mud flows back to the flocculation tank, the reflux ratio is controlled at 4%, and the m...

technical field

[0001] The invention belongs to the field of water treatment, and in particular relates to a short-flow advanced treatment process for treating polluted source water, in particular to a combined process of powdered carbon backflow and carbon sand filter tank for treating polluted water. Background technique

[0002] At present, there are micro-pollution problems in drinking water sources in most areas of my country, especially in frequent outbreaks of water source water seasonal and sudden pollution incidents, trace organic matter, ammonia nitrogen and smell and taste problems seriously threaten the hygiene and safety of drinking water for local residents . my country's new "Drinking Water Sanitation Standard" (GB5749-2006) has been promulgated and implemented on July 1, 2007, and has put forward specific requirements for organic matter, ammonia nitrogen, especially smell and taste. However, the traditional conventional water treatment process has limited rem...

Examples

Embodiment 1

[0028] In this embodiment, the turbidity of the raw water to be treated is 4.62NTU, and the UV 254 0.0374cm -1 , ammonia nitrogen 2.907mg / L, pH value 7.6-8.0, water temperature 20-24°C, GSM 267.25ng / L, 2-MIB 274.87ng / L. Using the process of the present invention, the mechanical mixing tank, mechanical flocculation tank, inclined tube sedimentation tank, carbon / sand double-layer filter and powder carbon reflux process are combined, and powdered activated carbon and polyaluminum chloride are continuously added to the raw water. The dosage of aluminum is 15mg / L, the dosage of powdered activated carbon is 5mg / L, the hydraulic retention time of the mixing tank is 1min, and the G value is controlled at 800s -1 ;The hydraulic retention time of the flocculation tank is 15min, and the average G value is controlled at 50s -1 ; After sinking, the activated carbon mud flows back to the flocculation tank, the reflux ratio is controlled at 10%, and the mud age is 5 days; the thickness of ...

Embodiment 2

[0030] In this embodiment, the turbidity of the raw water to be treated is 4.02NTU, and the UV 254 0.0354cm -1, ammonia nitrogen 3.008mg / L, pH value 7.9, water temperature 19-24°C, GSM 257.45ng / L, 2-MIB 284.37ng / L. By adopting the process of the present invention, the mechanical mixing tank, the clapboard flocculation tank, the inclined tube sedimentation tank, the carbon / sand double-layer filter tank and the powder carbon reflux process are combined, and the powdered activated carbon, aluminum sulfate and coagulant aid are continuously added to the mixing tank. Acrylamide, the dosage of aluminum sulfate is 20mg / L, the dosage of powdered activated carbon is 6.0mg / L, the dosage of polyacrylamide is 0.1mg / L, the hydraulic retention time of the mixing tank is 0.5min, and the G value is controlled at 1000s -1 ; The hydraulic retention time of the flocculation tank is 20min, and the average G value is controlled at 30s -1 After sinking, the activated carbon mud flows back to the ...

Embodiment 3

[0032] In this embodiment, the turbidity of the raw water to be treated is 6.00NTU, and the UV 254 0.0256cm -1 , ammonia nitrogen 2.645mg / L, pH value 7.6, water temperature 20-22°C, GSM 242.06ng / L, 2-MIB 268.22ng / L. By adopting the process of the present invention, the mechanical mixing tank, the clapboard flocculation tank, the inclined tube sedimentation tank, the carbon / sand double-layer filter tank and the powder carbon reflux process are combined, and powdered activated carbon and polyaluminum chloride are continuously added to the mixing tank. The dosage of aluminum chloride is 20mg / L, the dosage of powdered activated carbon is 6.0mg / L, the hydraulic retention time of the mixing tank is 0.5min, and the G value is controlled at 900s -1 ; The hydraulic retention time of the flocculation tank is 18min, and the average G value is controlled at 20s -1 After sinking, the activated carbon mud flows back to the flocculation tank, the reflux ratio is controlled at 4%, and the m...

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