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Method for removing phosphorous based on high-efficiency promotion of spongy iron corrosion in process of nitrogen removal by denitrification

A technology of nitrification and denitrification and sponge iron, which is applied in the field of environmental engineering, can solve the problems of increasing operation and management costs, and achieve the effects of improving phosphorus removal efficiency, improving denitrification effect, and promoting corrosion and phosphorus removal

Inactive Publication Date: 2016-03-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, corroding sponge iron to remove phosphorus by electric current will inevitably increase the operation and management costs, so how to promote the corrosion of sponge iron to improve the efficiency of nitrogen and phosphorus removal needs further research

Method used

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  • Method for removing phosphorous based on high-efficiency promotion of spongy iron corrosion in process of nitrogen removal by denitrification
  • Method for removing phosphorous based on high-efficiency promotion of spongy iron corrosion in process of nitrogen removal by denitrification
  • Method for removing phosphorous based on high-efficiency promotion of spongy iron corrosion in process of nitrogen removal by denitrification

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The test water is to add a certain amount of CH to tap water 3 COONa, KNO 3 and KH 2 PO 4 Artificial water distribution for simulating the secondary effluent of a sewage treatment plant. Control the concentration of TN and TP as follows: ρ(TN)=ρ(NO 3 -N)=35mg.L -1 , ρ(H 2 PO 4 -P)=1.3mg.L -1 . At the same time with 1mol L -1 of hydrochloric acid and 1mol·L -1 Sodium hydroxide solution is used to adjust the pH value of the distribution water to maintain at 6.8-7.2.

[0030]Experimental group I was filled with 150g of sponge iron particles with a particle size of 4-5mm and 100g of sulfur particles with a particle size of 2-3mm, which were mixed evenly and placed in a 500mL conical flask. The filler of the control group I used the same quality of sponge iron particles, and other control conditions were the same as those of the test group I. The hydraulic retention time HRT is 24h, the shaker speed is controlled at 64r / min, and the temperature is 28±2°C.

Embodiment 2

[0032] The experimental water is to add a certain amount of CH to tap water 3 COONa, KNO 3 and KH 2 PO 4 Artificial water distribution for simulating the secondary effluent of sewage treatment plant. Control the concentration of TN and TP as follows: ρ(TN)=ρ(NO 3 -N)=30mg.L -1 , ρ(H 2 PO 4 -P)=1.5mg.L -1 . At the same time with 1mol L -1 of hydrochloric acid and 1mol·L -1 Sodium hydroxide solution is used to adjust the pH value of the distribution water to maintain at 7.0-7.5.

[0033] The reactor adopts a plexiglass column with an inner diameter of 25 cm, a height of 0.6 m, and an effective volume of 8 L. The filler composition of experimental group II and control group II is shown in Table 1, wherein the particle size of sponge iron is 5-8mm, and the particle size of sulfur is 2-3mm. The hydraulic retention time HRT is controlled at 2h, 4h and 8h respectively.

[0034] Table 1 Reactor packing composition

[0035]

[0036] In the above implementation mode, th...

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Abstract

The invention provides a method for removing phosphorous based on high-efficiency promotion of spongy iron corrosion in the process of nitrogen removal by denitrification, belonging to the field of environment engineering technology. Sulphur can be used both as an electron donor for denitrification and as a reinforcing agent for promoting corrosion of spongy iron to remove phosphorous; when spongy iron and sulphur are mixed and put into a reactor, the phosphorous removal effect through corrosion of spongy iron can be improved; and when a mixture of sulphur mainly exerting sulfur-based autotrophic denitrification effect and spongy iron mainly exerting phosphorous removal effect through corrosion is used as a filling material of a denitrification filter tank, the effect of phosphorous removal can be improved, the process of denitrification is reinforced, so the dual effects of in-depth phosphorous removal and synchronous nitrogen removal on low carbon-nitrogen-ratio reclaimed water are obtained. The method provided by the invention has good application prospects in treatment of high-quality reclaimed water.

Description

technical field [0001] The invention relates to a method suitable for deep denitrification and dephosphorization of regenerated water, based on the method of strengthening the corrosion and dephosphorization of sponge iron when used as a filler in a denitrification filter, and belongs to the technical field of environmental engineering. Background technique [0002] Sewage recycling is an inevitable way to solve the water crisis. Due to the limitations of sewage treatment technology, the traditional combined method of biological nitrogen and phosphorus removal has complex operating control conditions, and often cannot guarantee a good nitrogen and phosphorus removal effect, and the process is too complicated or the dosage is too much, and the operation and management costs are high. Studies have shown that nitrogen and phosphorus are the controlling factors of eutrophication in most water bodies. For closed waters such as lakes and reservoirs, when the inorganic total nitro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/28C02F101/10C02F101/16
CPCC02F3/28C02F2101/105C02F2101/16C02F2305/06
Inventor 郝瑞霞范军辉徐忠强周彦卿王卫东王冬月钟丽燕朱晓霞万京京
Owner BEIJING UNIV OF TECH
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