Reinforced nitrogen and phosphorus removal method suitable for reclaimed water with low carbon nitrogen ratio

A technology for denitrification and phosphorus removal and low carbon to nitrogen ratio, applied in the field of environmental engineering, can solve problems such as insufficient hydrogen production by corrosion, and achieve the effects of enhancing the process of autotrophic denitrification and denitrification, promoting growth metabolism, and increasing inorganic carbon sources.

Inactive Publication Date: 2013-07-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, as a new type of treatment process, the three-dimensional electrode biofilm process still has some aspects that need to be optimized, such as rational selection of electrode material...

Method used

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  • Reinforced nitrogen and phosphorus removal method suitable for reclaimed water with low carbon nitrogen ratio
  • Reinforced nitrogen and phosphorus removal method suitable for reclaimed water with low carbon nitrogen ratio
  • Reinforced nitrogen and phosphorus removal method suitable for reclaimed water with low carbon nitrogen ratio

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Experimental program
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Effect test

Embodiment 1

[0025] Direct treatment pH=7, COD=45mg / L, NO 3 - -N=30mg / L,H 2 PO 4 - -P=1.5mg / L artificial water distribution to simulate the water quality of reclaimed water. Control the hydraulic retention time to 10h, the current intensity to 40mA, and the temperature to 15°C. Influent water enters from the bottom of the reactor, passes through the limestone supporting layer and flows evenly into the main reaction area, and exits from the outlet on the upper part of the reactor. In this way, the experimental group effluent NO 3 - -N=3.84mg / L, TN=8.70mg / L, COD=10mg / L, TP is less than 0.3mg / L. The removal rate of nitrate nitrogen in the test group was about 16%-18% higher than that of the control group, and the removal rate of TN was about 8%-14% higher than that of the control group.

Embodiment 2

[0027] Direct treatment pH=7, COD=45mg / L, NO 3 - -N=30mg / L,H 2 PO 4 --P=1.5mg / L artificial water distribution to simulate the water quality of reclaimed water. Control the hydraulic retention time to 10h, the current intensity to 60mA, and the temperature to 15°C. Influent water enters from the bottom of the reactor, passes through the limestone supporting layer and flows evenly into the main reaction area, and exits from the outlet on the upper part of the reactor. In this way, the experimental group effluent NO 3 - -N=2.65mg / L, TN=5.90mg / L, COD=10mg / L, TP is less than 0.3mg / L. The removal rate of nitrate nitrogen in the test group was about 16%-18% higher than that of the control group, and the removal rate of TN was about 10%-12% higher than that of the control group.

Embodiment approach

[0028] In the above two implementations, the application of sponge iron and activated carbon composite fillers in the three-dimensional electrode biofilm process can strengthen the removal of nitrogen and phosphorus in the low carbon-to-nitrogen ratio reclaimed water. Compared with the three-dimensional electrode biofilm reactor only filled with activated carbon filler in the comparative test under the same conditions, the efficiency of nitrogen and phosphorus removal has been greatly improved. The effect is obvious.

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Abstract

The invention provides a reinforced nitrogen and phosphorus removal method suitable for reclaimed water with a low carbon nitrogen ratio, belonging to the field of environmental engineering. The reinforced nitrogen and phosphorus removal method is based on a three-dimensional electrode biochemical membrane technology. According to the reinforced nitrogen and phosphorus removal method, the nitrogen and phosphorus removal is reinforced through electrochemistry and biological denitrification coupled process, a graphite rod is used as the anode of a reactor, foamed nickel is used as the cathode of the reactor, and a sponge iron and activated carbon composite padding is filled between the anode and the cathode; under the action of electric currents, the cathode generates hydrogen for autotrophic denitrification by hydrogen bacteria, and the anode generates CO2 for providing an inorganic carbon source for microorganisms and buffering the pH value of the system; the sponge iron and activated carbon composite padding forms lots of micro-primary batteries, and sponge iron is corroded to generate hydrogen so as to provide lots of electron donors for the microorganisms, promote the growth and metabolism of the autotrophic microorganisms and reduce the requirements on an organic carbon source, and the sponge iron is beneficial to formation of anaerobic environments in the system; the nitrogen removal effect by autotrophic denitrification is reinforced through the process above; and the sponge iron is corroded to generate Fe<2+> and Fe<3+>, and the hydrolysis product of the sponge iron enables the phosphorus in yielding water to be substantially reduced.

Description

technical field [0001] The invention relates to an enhanced nitrogen and phosphorus removal method suitable for low carbon-to-nitrogen ratio reclaimed water, in particular to the efficient removal of nitrogen and phosphorus from low-carbon-to-nitrogen ratio regenerated water by using an improved three-dimensional electrode biofilm process, and belongs to the technical field of environmental engineering. Background technique [0002] Sewage recycling is an inevitable way to solve the water crisis. According to the existing research basis, due to the limitation of sewage treatment technology, the operation and control conditions of the traditional combined method of biological nitrogen and phosphorus removal are complicated, and often cannot guarantee a good effect of nitrogen and phosphorus removal. The total nitrogen and total phosphorus content in the effluent of some reclaimed water plants None of them can stably meet the requirements of the "Urban Sewage Reuse Landscape W...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F3/34C02F3/28
Inventor 郝瑞霞王建超孟成成任晓克王润众赵文莉
Owner BEIJING UNIV OF TECH
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