Device and process for preparing struvite crystals from nitrogen and phosphorus in sewage

A struvite, nitrogen and phosphorus technology, which is applied in water/sewage treatment, water/sludge/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of increased power cost and unfavorable struvite collection, etc. Achieve the effect of small footprint, optimized effluent quality, and good crystallization conditions

Inactive Publication Date: 2013-03-13
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this device forms struvite crystals as fine crystals, without the formation of struvite particles, which is not conducive to the collection of struvite; at the same time, this patent uses an aeration device to promote the growth of struvite crystals and prevent crystals from forming on the inner wall of the reactor. Fouling, but will significantly increase power costs

Method used

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  • Device and process for preparing struvite crystals from nitrogen and phosphorus in sewage
  • Device and process for preparing struvite crystals from nitrogen and phosphorus in sewage
  • Device and process for preparing struvite crystals from nitrogen and phosphorus in sewage

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Embodiment 1

[0031] Please refer to the attached Figure 1-3 . Devices of the invention were constructed.

[0032] Make reactor 5 with transparent plexiglass. The reactor 5 includes a reactor overflow weir 1 , a reactor sedimentation pipe 2 , a reactor growth pipe 3 , a reactor crystal collection pipe 8 and a reactor feed pipe 9 from top to bottom. First make a reactor growth tube 3, the shape of the reactor growth tube 3 is a trumpet-shaped tube with a large top and a small bottom, the diameter of the large end: the diameter of the small end = 3:1; the length of the reactor growth tube 3: small End diameter = 40:1. The top of the big end diameter of the reactor growth tube 3 is welded firmly with the bottom end of the reactor settling tube 2, and the diameter of the reactor settling tube 2 is 2 times of the big end diameter of the reactor crystal growth tube 3, and the diameter of the reactor settling tube 2 There is a reactor overflow weir 1 at the top, and the center of the bottom e...

Embodiment 2

[0036] Simulation of synthetic ammonia wastewater NH 3 -N concentration is 400mg / L, that is, 1 ton of water is pumped into the nitrogenous and phosphorus-containing wastewater tank 22 earlier, ammonium chloride solid 1.528Kg is added in the wastewater tank 22, and then disodium hydrogen phosphate solid 10.228Kg is added in the ammonia nitrogen wastewater, At this time, the NH in the simulated wastewater 3 -N concentration is 400mg / L, PO 4 3- P concentration is 885.7mg / L (maintain NH 3 -N:PO 4 3- P molar ratio 1:1). Configure a magnesium chloride solution containing 685.7 mg / l of magnesium ions (that is, add 5.800 kg of magnesium chloride solid to 1 ton of water), and use the magnesium salt impeller pump 11 to pump the MgCl 2 The solution is pumped into the reactor 5 through the magnesium salt inlet 10 according to the molar ratio of N:P:Mg=1:1:1, and the synthetic ammonia wastewater in the nitrogen-phosphorous wastewater tank 22 is passed through the wastewater inlet 15 ...

Embodiment 3

[0039] The synthetic ammonia wastewater is replaced with glyphosate wet oxidation pretreatment wastewater, and the NH in the glyphosate wet oxidation pretreatment wastewater 3 -N concentration is 1000mg / L. First 1 ton of water is pumped into the nitrogenous and phosphorus-containing wastewater tank 22, and 3.821 kg of ammonium chloride solid and 25.571 kg of disodium hydrogen phosphate solid are respectively added to the nitrogenous and phosphorus-containing wastewater tank 22 to make the NH in the wastewater 3 -N concentration is 1000mg / L, PO 4 3— P concentration is 2214.28mg / L (maintain NH 3 -N:PO 4 3— P molar ratio 1:1), configure the magnesium chloride solution that contains magnesium ion concentration to be 2228.56mg / l, promptly add 18.85kg magnesium chloride solid to 1 ton of water, the NH that pumps into the reactor at this moment 3 -N:PO 4 3— P:Mg 2+ The molar ratio is 1:1:1.25. NaOH solution was used to adjust and maintain pH=6.4±0.1, and other conditions wer...

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Abstract

The invention relates to a device and a process for preparing struvite crystals from nitrogen and phosphorus in sewage. The device comprises a reactor (5), a pH (potential of Hydrogen) controller (25), a pH regulating pump (24), an alkali liquor tank (23), a nitrogen and phosphorus containing waste water tank (22) and a secondary sedimentation tank (19), wherein the reactor (5) is composed of a reactor feed pipe (9), a reactor crystal collecting pipe (8), a reactor growth tube (3) and a reactor sediment tube (2) from bottom to top. The process comprises the steps of pumping nitrogen and phosphorus containing wastewater into the reactor (5) and pumping a magnesium chloride solution into the reactor (5) to ensure that the molar ratio of NH3-N to PO43-P to Mg <2+> in the reactor (5) is (1:1:1)-(1:1:1.3); controlling the reflux ratio between 14 and 28 and the pH equal to 6.4-9.2; and forming the struvite crystals in the reactor (5) by using the nitrogen, phosphorus and magnesium containing solution. The device disclosed by the invention has the advantages of simple structure and small floor space, is simple and easy to operate and difficult to scale, can be widely applied to preparation of the struvite crystals from the nitrogen and phosphorus containing wastewater such as coking wastewater, pig manure wastewater or sludge fermentation liquor, and is capable of realizing the resource recycling of nitrogen and phosphorus.

Description

technical field [0001] The invention relates to a device and a process for preparing nitrogen and phosphorus in sewage into struvite crystals. Specifically, it is a device and process for recovering nitrogen and phosphorus in sewage by using struvite crystallization and granulation technology, and belongs to the technical field of waste water treatment and resource utilization. Background technique [0002] Nitrogen and phosphorus contained in sewage are the main causes of eutrophication in lakes, rivers and oceans. With the development of industrial and agricultural production and the improvement of people's living standards, the discharge of nitrogen and phosphorus pollutants in my country has increased sharply, resulting in The eutrophication of water bodies in China has seriously endangered the development of many industries such as agriculture, fishery, tourism, etc., and also poses a great threat to drinking water sanitation and food safety. [0003] However, nitrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58C02F1/52C01B25/45
Inventor 李咏梅刘鸣燕马璐艳袁志文
Owner TONGJI UNIV
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