Feedwater treatment method by pre-ozonation and aerated biological activated carbon

Abstract

The invention discloses a method for applying pre-ozonation and aerated biological activated carbon processes to feedwater treatment. The method combines ozone pre-oxidation, an aerated biological activated carbon filter tank and a coagulation-sedimentation-sand filtering-disinfection conventional feedwater treatment process to produce drinking water, is a feedwater treatment process for improving water quality of feed water aiming at micro-polluted drinking water sources, and integrates the characteristics of an aerated biofilter biological pre-treatment process and an ozone biological activated carbon advanced water-purifying process. Raw water enters a pre-ozonation contact tank, a coagulation sedimentation tank and the aerated biological activated carbon filter tank orderly, is disinfected, enters a sand filtering tank, and finally flows into a clear water tank. Because the pre-ozonation contact tank and the aerated biological activated carbon filter tank are arranged in the conventional feedwater treatment process, the effect of removing organic matters, ammonia nitrogen, pathogenic microorganism, odor, chroma and the like is greatly improved, and the water quality safety of the method is obviously superior to that of the biological pre-treatment process and the ozone biological activated carbon advanced water-purifying process.

Description

technical field

[0001] The invention relates to the technical field of water supply treatment, in particular to the technical field of purifying slightly polluted drinking water sources, and in particular to a method for applying the pre-ozone and aeration biological activated carbon process to water supply treatment. Background technique

[0002] In recent years, urban drinking water sources have been increasingly polluted. With the improvement of urban water quality standards in my country, the current conventional "coagulation-sedimentation-sand filtration-disinfection" urban water supply treatment process has been difficult to adapt to existing water sources and Therefore, new water treatment technologies must be developed to adapt to deteriorating water supply sources and improve water supply quality.

[0003] For water sources that are slightly polluted by ammonia nitrogen and organic matter, biological water treatment technology is often used at home and abroad. Biolo...

Examples

Embodiment 1

[0030] The monthly average of the raw water ammonia nitrogen in the dry season of the test raw water is basically 1.5-2.5mg / L.

[0031] Such as figure 1 Shown, a kind of pre-ozone and aerated biological activated carbon feedwater treatment method comprises the following steps:

[0032] (1) The raw water first enters the pre-ozone contact tank, and ozone is added to the tank to pre-oxidize the raw water; calculated according to the volume of raw water, the dosage of ozone is 1.0 mg / L, and the contact time is 10 minutes;

[0033](2) Before the effluent of step (1) enters the coagulation reaction tank, dosing coagulant polyaluminum chloride is calculated according to the volume of raw water, and the dosage is 100 mg / L. After fully mixing, coagulation reaction and precipitation are carried out to remove Turbidity substances; an aerated biological activated carbon filter is set after the sedimentation tank of the treatment system, which can biodegrade ammonia nitrogen and organic ...

Embodiment 2

[0039] The monthly average of ammonia nitrogen in raw water during the test is basically 1.0-1.5mg / L.

[0040] Such as figure 1 Shown, a kind of pre-ozone and aerated biological activated carbon feedwater treatment method comprises the following steps:

[0041] (1) The raw water first enters the pre-ozone contact tank, and ozone is added to the tank to pre-oxidize the raw water; calculated according to the volume of raw water, the dosage of ozone is 0.8 mg / L, and the contact time is 10 minutes;

[0042] (2) Before the effluent of step (1) enters the coagulation reaction tank, dosing coagulant polyaluminum chloride is calculated according to the volume of raw water, and the dosage is 100 mg / L. After fully mixing, coagulation reaction and precipitation are carried out to remove Turbidity substances; an aerated biological activated carbon filter is set after the sedimentation tank of the treatment system, which can biodegrade ammonia nitrogen and organic matter, and non-biochemi...

Embodiment 3

[0048] The monthly average of ammonia nitrogen in raw water during the test is generally lower than 1.0mg / L.

[0049] Such as figure 1 Shown, a kind of pre-ozone and aerated biological activated carbon feedwater treatment method comprises the following steps:

[0050] (1) The raw water first enters the pre-ozone contact tank, and ozone is added to the tank to pre-oxidize the raw water; calculated according to the volume of raw water, the dosage of ozone is 0.5 mg / L, and the contact time is 10 minutes;

[0051] (2) Before the effluent of step (1) enters the coagulation reaction tank, dosing coagulant polyaluminum chloride is calculated according to the volume of raw water, and the dosage is 50 mg / L. After fully mixing, coagulation reaction and precipitation are carried out to remove Turbidity substances; an aerated biological activated carbon filter is set after the sedimentation tank of the treatment system, which can biodegrade ammonia nitrogen and organic matter, and non-bi...

technical field

[0001] The invention relates to the technical field of water supply treatment, in particular to the technical field of purifying slightly polluted drinking water sources, and in particular to a method for applying the pre-ozone and aeration biological activated carbon process to water supply treatment. Background technique

[0002] In recent years, urban drinking water sources have been increasingly polluted. With the improvement of urban water quality standards in my country, the current conventional "coagulation-sedimentation-sand filtration-disinfection" urban water supply treatment process has been difficult to adapt to existing water sources and Therefore, new water treatment technologies must be developed to adapt to deteriorating water supply sources and improve water supply quality.

[0003] For water sources that are slightly polluted by ammonia nitrogen and organic matter, biological water treatment technology is often used at home and abroad. Biolo...

Examples

Embodiment 1

[0030] The monthly average of the raw water ammonia nitrogen in the dry season of the test raw water is basically 1.5-2.5mg / L.

[0031] Such as figure 1 Shown, a kind of pre-ozone and aerated biological activated carbon feedwater treatment method comprises the following steps:

[0032] (1) The raw water first enters the pre-ozone contact tank, and ozone is added to the tank to pre-oxidize the raw water; calculated according to the volume of raw water, the dosage of ozone is 1.0 mg / L, and the contact time is 10 minutes;

[0033](2) Before the effluent of step (1) enters the coagulation reaction tank, dosing coagulant polyaluminum chloride is calculated according to the volume of raw water, and the dosage is 100 mg / L. After fully mixing, coagulation reaction and precipitation are carried out to remove Turbidity substances; an aerated biological activated carbon filter is set after the sedimentation tank of the treatment system, which can biodegrade ammonia nitrogen and organic ...

Embodiment 2

[0039] The monthly average of ammonia nitrogen in raw water during the test is basically 1.0-1.5mg / L.

[0040] Such as figure 1 Shown, a kind of pre-ozone and aerated biological activated carbon feedwater treatment method comprises the following steps:

[0041] (1) The raw water first enters the pre-ozone contact tank, and ozone is added to the tank to pre-oxidize the raw water; calculated according to the volume of raw water, the dosage of ozone is 0.8 mg / L, and the contact time is 10 minutes;

[0042] (2) Before the effluent of step (1) enters the coagulation reaction tank, dosing coagulant polyaluminum chloride is calculated according to the volume of raw water, and the dosage is 100 mg / L. After fully mixing, coagulation reaction and precipitation are carried out to remove Turbidity substances; an aerated biological activated carbon filter is set after the sedimentation tank of the treatment system, which can biodegrade ammonia nitrogen and organic matter, and non-biochemi...

Embodiment 3

[0048] The monthly average of ammonia nitrogen in raw water during the test is generally lower than 1.0mg / L.

[0049] Such as figure 1 Shown, a kind of pre-ozone and aerated biological activated carbon feedwater treatment method comprises the following steps:

[0050] (1) The raw water first enters the pre-ozone contact tank, and ozone is added to the tank to pre-oxidize the raw water; calculated according to the volume of raw water, the dosage of ozone is 0.5 mg / L, and the contact time is 10 minutes;

[0051] (2) Before the effluent of step (1) enters the coagulation reaction tank, dosing coagulant polyaluminum chloride is calculated according to the volume of raw water, and the dosage is 50 mg / L. After fully mixing, coagulation reaction and precipitation are carried out to remove Turbidity substances; an aerated biological activated carbon filter is set after the sedimentation tank of the treatment system, which can biodegrade ammonia nitrogen and organic matter, and non-bi...

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