Method for treating ammonia nitrogen waste water

A treatment method and technology for ammonia nitrogen wastewater, applied in water/sewage treatment, water/sewage multi-stage treatment, neutralized water/sewage treatment, etc., can solve the problem that it is difficult to achieve the standard of 50mg/l for single-pass ammonia nitrogen removal, etc. Achieve the effects of short reaction settling time, high ammonia nitrogen removal efficiency, and reduced wastewater turbidity

Active Publication Date: 2008-06-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For wastewater with relatively high ammonia nitrogen content (greater than 1000mg/l), it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Ammonia content is the waste water of 3458mg / l, and flow rate is 120kg / hr, and turbidity is 25.5NTU, according to the weight ratio of A:B=3:1, it is divided into A, B two streams. A share of waste water is introduced into reactor 1, and MgCl is added at a constant speed of 5.26kg / hr therein 2 ·6H 2 0, stirring and dissolving, adding 40% industrial caustic soda solution, adjusting the pH value to 9.0~9.5; B stock waste water is introduced into reactor 2, 85% industrial phosphoric acid (the magnesium salt precipitating agent that adds) wherein 2.74kg / hr uniform speed adds , phosphoric acid precipitating agent and the mol ratio of the ammonia nitrogen in waste water is 1.08: 1.03: 1), add 40% industrial caustic soda solution and adjust pH value to 3.0~3.8; Two strands of waste water that will regulate are mixed in reactor 3, add 40% industrial caustic soda solution adjusts the pH value to 8.6-9.2, the treated wastewater settles through the sedimentation tank, the residenc...

Embodiment 2

[0036] Wastewater with an ammonia content of 5480mg / l, a flow rate of 108kg / hr, and a turbidity of 45NTU is divided into 30kg / hr (A1 share), 50kg / hr (A2 share) and 8kg / hr (B1 share) and 20kg / hr (B2 shares) four streams. A1 waste water is introduced into reactor 1, and MgSO is added at a constant speed of 4.42kg / hr therein 4 , stirred and dissolved, A2 waste water was introduced into reactor 2, and 40% industrial caustic soda solution was added to adjust the pH value to 13-14. The two streams of A1 and A2 were mixed through a static mixer to adjust the pH value to 8.9-9.5; B1 waste water Introduce reactor 3, add the industrial phosphoric acid that concentration is 85% to wherein 1.06kg / hr uniform speed, B2 stock waste water introduces reactor 4, wherein 10.67kg / hr uniform speed adds content and is 98% Na 3 PO 4 12H 2 O, (the mol ratio of the ammonia nitrogen in the magnesium salt precipitating agent, phosphoric acid precipitating agent and waste water that adds is 1.12: 1.12...

Embodiment 3

[0040] Ammonia content is the waste water of 1058mg / l, and flow rate is 210kg / hr, and turbidity is 21NTU, and it is divided into 60kg / hr (A1 strand), 60kg / hr (A2 strand) and 90kg / hr (B strand) three streams. A1 waste water is introduced into reactor 1, and MgCl is added therein at a constant speed of 2.55kg / hr 2 ·6H 2 O, stirred and dissolved; A2 waste water was introduced into reactor 2, and MgO was added at a constant speed of 0.05kg / hr therein, A1 and A2 two streams were mixed by a static mixer, and 40% industrial caustic soda solution was added to adjust the pH value to 9.1~9.5; B stock wastewater is introduced into reactor 2, and NaH is added at a constant speed of 2.02kg / hr therein 2 PO 4 (the mol ratio of the magnesium salt precipitant, the phosphoric acid precipitant and the ammonia nitrogen in the waste water added is 1.08: 1.03: 1), adjust the pH value to 3.0~3.5; The two strands of waste water that will adjust are mixed in the reactor 3, add 40% industrial causti...

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Abstract

A treatment method for waste water with ammonia nitrogen is characterized in that the waste water is divided into two parts, part A and part B, wherein, magnesium salt precipitant is added to the waste water of part A and the pH value thereof is adjusted to 7.0-10.5; phosphoric acid precipitant is added to the waste water of part B and the pH value thereof is adjusted to 1-4.0; then the waste water of the two parts is mixed and the pH value of the mixed waste water is adjusted to 8-10; after sedimentation the sediment of magnesium ammonium phosphate and supernatant liquor with ammonia nitrogen removed are obtained. The method of the invention improves the utilization rate of the precipitant and has high ammonia nitrogen removal efficiency; the obtained MAP is easy to deposit and separate and the turbidity is dramatically reduced, thereby reducing the difficulty of following flocculation treatment with short reaction sedimentation.

Description

technical field [0001] The invention relates to a method for removing dissolved nitrogen-containing compounds in waste water, more specifically, relates to a method for removing ammonia nitrogen in waste water by adopting magnesium ammonium phosphate precipitation method. Background technique [0002] A large amount of wastewater containing ammonia nitrogen is discharged into rivers and lakes, which not only causes eutrophication of natural water bodies, but also brings great difficulties to the treatment of domestic and industrial water. Therefore, it is very important to remove ammonia nitrogen in wastewater in water environment protection. [0003] In order to control water pollution, protect rivers, rivers, lakes, seas and other surface water and groundwater quality, ensure human health, and maintain ecological balance, the National Environmental Protection Agency approved and implemented the "Comprehensive Wastewater Discharge Standard" GB8978-1996. , phosphate and oth...

Claims

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Application Information

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IPC IPC(8): C02F1/58C02F9/04C02F1/66
Inventor 吕庐峰周健龙军王骞李学锋连西美吴梅田志鸿
Owner CHINA PETROLEUM & CHEM CORP
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