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Method for removing ammonia and nitrogen in raw water with powdery zeolite

A technology of powdered zeolite and raw water, which is applied in the field of strengthening conventional drinking water treatment technology, can solve the problems of poor removal of ammonia nitrogen, etc., and achieve the effects of reducing effluent turbidity, improving the effect of removing ammonia nitrogen, and promoting coagulation

Inactive Publication Date: 2007-08-08
SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of process simple, with low cost, can effectively remove the method for the ammonia nitrogen in the raw water with lower turbidity, this method overcomes the ammonia nitrogen concentration seasonal variation and turbidity in the raw water and removes ammonia nitrogen The disadvantage of poor effect ensures the quality of drinking water

Method used

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  • Method for removing ammonia and nitrogen in raw water with powdery zeolite

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Embodiment 1

[0020] Prepare the zeolite powder aqueous solution first, adopt the powdered zeolite with an average particle diameter of 14 μm in the table above, and prepare the zeolite powder aqueous solution with a concentration of 2% according to powder zeolite: water=2:100 weight percent. Then pump the prepared zeolite powder aqueous solution into the raw water to be treated with an ammonia nitrogen concentration of 2mg / L and a turbidity of 5NTU in the mixing tank. The dosage is 500mg / L, that is, 500mg per liter of raw water to be treated The zeolite powder aqueous solution made of powdered zeolite is also added with a coagulant (commercially available alum) 30mg / L at the same time, that is, 30mg of alum is added per liter of raw water to be treated, and the adsorption coagulation is completed after mixing and stirring for 10 seconds. Then the raw water that has undergone coagulation and adsorption reaction is pumped into the sedimentation tank for sedimentation, and the residence time i...

Embodiment 2

[0022] When preparing the zeolite powder aqueous solution, the above-mentioned powdered zeolite with an average particle diameter of 10 μm is used to prepare the zeolite powder aqueous solution according to powder zeolite:water=3:100 weight percent. Then add the prepared zeolite powder aqueous solution and coagulant ferric chloride into the raw water to be treated with the ammonia nitrogen concentration of 1mg / L and the turbidity of 10NTU. The dosage is 100mg / L, that is, every liter of raw water to be treated Add 100mg of zeolite powder aqueous solution made of powdered zeolite, and also add 20mg / L of coagulant ferric chloride, that is, add 20mg of ferric chloride per liter of raw water to be treated, and mix for 30 seconds. Then the raw water that has undergone coagulation and adsorption reaction is pumped into the sedimentation tank for sedimentation, and the residence time is 10 minutes. Finally, the effluent from the sand filter with a filtration rate of 10 m / h was tested ...

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Abstract

A process for removing ammonia and nitrogen in raw water by zeolite powder is carried out by zeolite powder agitating with water, mixing preparing zeolite powder water solution with 2-3wt%, adding the water solution and coagulant into raw water to treat with adding account 100-500mg / L zeolite powder and 20-30mg / L coagulant, mixing agitating for 10-30 seconds, pumping the coagulated absorbed raw water into settling chamber for 5-10mins, and entering into sand filtering pool with 8-10m / hr speed. The content of ammonia and nitrogen is <0.5mg / L, etch is 0.3-0.6NTU, according to national drinking standard. It achieves simple process, low cost, to prevent regeneration of zeolite powder and to rapid remove ammonia and nitrogen in raw water.

Description

technical field [0001] The invention relates to a process for removing ammonia nitrogen in raw water. The process can strengthen coagulation technology while removing ammonia nitrogen in raw water, so it is especially suitable for the process of removing ammonia nitrogen in natural raw water with low turbidity and high concentration of ammonia nitrogen. Conventional drinking water treatment technology. Background technique [0002] An important indicator of the pollution of drinking water sources is the increase of the concentration of ammonia nitrogen in the water body. Although ammonia nitrogen itself does not directly cause harm to human health, its existence will affect water quality and treatment processes. Therefore, the technology of removing ammonia nitrogen in raw water is also the focus of current research on drinking water treatment technology. [0003] At present, there are four main processes commonly used to remove ammonia nitrogen in raw water: biochemical me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C01B39/02
Inventor 乐林生高乃云康兰英董秉直鲍士荣夏丽华
Owner SHANGHAI MUNICIPAL WATER RESOURCES DEV & UTILIZATION NAT ENG CENT
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