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A kind of reactor and method for removing nitrate in water

A reactor, nitrate technology, applied in chemical instruments and methods, water pollutants, water/sludge/sewage treatment, etc., to achieve the effects of high microbial adhesion, high hydrogen production and low price

Inactive Publication Date: 2011-11-30
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to propose a reactor and method for removing nitrate in water, so as to overcome the defect that the autotrophic denitrification needs to add an inorganic carbon source in the prior art

Method used

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  • A kind of reactor and method for removing nitrate in water
  • A kind of reactor and method for removing nitrate in water
  • A kind of reactor and method for removing nitrate in water

Examples

Experimental program
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Effect test

Embodiment 1

[0073] The biological carrier support cylinder is a cylinder made of plexiglass, with a height of 200mm, a diameter of 80mm, and a volume of 1.0L. Small holes with a diameter of 5 mm are evenly punched on the wall of the cylinder, and the distance between the holes is 18 mm along the circumferential direction and 20 mm along the normal direction, a total of 108 small holes. The small hole is filled with cotton thread, and a 1mm thick cotton thread (80% cotton, 20% acrylic) is hung on the cylinder wall as a soft biofilm carrier. The length of the external cotton thread is about 100mm, and the total effective volume is 3603cm 3, the wall of the cylinder is completely covered by cotton thread; 5m stainless steel wire (cathode) is fixed on the biological carrier support cylinder, and evenly interspersed and embedded in the soft carrier, and the end is connected with the cathode of the power supply; 8 carbon rods (anode) Evenly arranged in a circle, distributed around the soft carr...

Embodiment 2

[0076] The preparation of the biofilm module and the method for removing nitrate in water are as example 1, the nitrate concentration in the influent is 50mg / L, the C / N is 1.0, the pH is 7.6, the HRT is 8 hours, and when the current I is 10mA, the nitrate concentration in the effluent is 0.02mg / L; the concentration of nitrite is less than 0.01mg / L, all of which meet the national drinking water standards.

Embodiment 3

[0078] The preparation of the biofilm module and the method for removing nitrate in water are as example 1. The nitrate concentration in the influent is maintained at 50 mg / L, the C / N is 0.5, the pH is 7.1, the HRT is 8 hours, and when the current I is 100mA, the nitrate in the effluent Concentration 0.6mg / L, in line with national drinking water standards.

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Abstract

The invention discloses a reactor and method for removing nitrate in water, wherein, autotrophic denitrification and heterotrophic denitrification are carried out in coordination in the reactor, and the reactor includes: biofilm components, the biofilm The assembly includes a carrier and a water collector, the water collector has a plurality of filter holes, the carrier is filled in the filter holes, and there is a water outlet above the water collector; the reaction tank, the biological The membrane module is placed in the reaction tank, and the reaction tank has a water inlet; the anode is arranged in the reaction tank and is placed around the carrier; the cathode is arranged in the reaction tank and includes buried inside the carrier; and a power supply for supplying power to the anode and the cathode. In the present invention, autotrophic denitrification and heterotrophic denitrification are carried out synergistically in a reactor, and carbon dioxide produced by heterotrophic denitrification is used as an inorganic carbon source for autotrophic denitrification, which effectively utilizes the carbon source and improves energy utilization rate.

Description

technical field [0001] The invention relates to the application field of water treatment technology, in particular to a method and a reactor for removing nitrate in drinking water by combining electrochemical and biological treatment technology. Background technique [0002] Groundwater is an important part of the hydrological cycle and an important water resource for human beings. For water use in suburban and rural areas, groundwater has always been one of the important sources of drinking water. In recent years, the concentration of nitrate in groundwater has increased due to the large-scale application of nitrogen fertilizers, substandard discharge of domestic sewage and nitrogen-containing wastewater, leaching and infiltration of solid waste, and unreasonable recharge of sewage. Drinking nitrate-contaminated water will cause serious harm to human health. Nitrate can be reduced to toxic nitrite by microorganisms in the human body. Nitrite can convert divalent iron in he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30C02F101/16
Inventor 冯传平赵迎新
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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